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
  53 /*
  54  *  The following table defines the expected "StructureSize" of SMB2 requests
  55  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  56  *
  57  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  58  *  indexed by command in host byte order.
  59  */
  60 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  61         /* SMB2_NEGOTIATE */ 36,
  62         /* SMB2_SESSION_SETUP */ 25,
  63         /* SMB2_LOGOFF */ 4,
  64         /* SMB2_TREE_CONNECT */ 9,
  65         /* SMB2_TREE_DISCONNECT */ 4,
  66         /* SMB2_CREATE */ 57,
  67         /* SMB2_CLOSE */ 24,
  68         /* SMB2_FLUSH */ 24,
  69         /* SMB2_READ */ 49,
  70         /* SMB2_WRITE */ 49,
  71         /* SMB2_LOCK */ 48,
  72         /* SMB2_IOCTL */ 57,
  73         /* SMB2_CANCEL */ 4,
  74         /* SMB2_ECHO */ 4,
  75         /* SMB2_QUERY_DIRECTORY */ 33,
  76         /* SMB2_CHANGE_NOTIFY */ 32,
  77         /* SMB2_QUERY_INFO */ 41,
  78         /* SMB2_SET_INFO */ 33,
  79         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  80 };
  81
  82 static int encryption_required(const struct cifs_tcon *tcon)
  83 {
  84         if (!tcon)
  85                 return 0;
  86         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  87             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  88                 return 1;
  89         if (tcon->seal &&
  90             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  91                 return 1;
  92         return 0;
  93 }
  94
  95 static void
  96 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  97                   const struct cifs_tcon *tcon)
  98 {
  99         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 100         shdr->StructureSize = cpu_to_le16(64);
 101         shdr->Command = smb2_cmd;
 102         if (tcon && tcon->ses && tcon->ses->server) {
 103                 struct TCP_Server_Info *server = tcon->ses->server;
 104
 105                 spin_lock(&server->req_lock);
 106                 /* Request up to 2 credits but don't go over the limit. */
 107                 if (server->credits >= server->max_credits)
 108                         shdr->CreditRequest = cpu_to_le16(0);
 109                 else
 110                         shdr->CreditRequest = cpu_to_le16(
 111                                 min_t(int, server->max_credits -
 112                                                 server->credits, 2));
 113                 spin_unlock(&server->req_lock);
 114         } else {
 115                 shdr->CreditRequest = cpu_to_le16(2);
 116         }
 117         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 118
 119         if (!tcon)
 120                 goto out;
 121
 122         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 123         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 124         if ((tcon->ses) && (tcon->ses->server) &&
 125             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 126                 shdr->CreditCharge = cpu_to_le16(1);
 127         /* else CreditCharge MBZ */
 128
 129         shdr->TreeId = tcon->tid;
 130         /* Uid is not converted */
 131         if (tcon->ses)
 132                 shdr->SessionId = tcon->ses->Suid;
 133
 134         /*
 135          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 136          * to pass the path on the Open SMB prefixed by \\server\share.
 137          * Not sure when we would need to do the augmented path (if ever) and
 138          * setting this flag breaks the SMB2 open operation since it is
 139          * illegal to send an empty path name (without \\server\share prefix)
 140          * when the DFS flag is set in the SMB open header. We could
 141          * consider setting the flag on all operations other than open
 142          * but it is safer to net set it for now.
 143          */
 144 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 145                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 146
 147         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 148             !encryption_required(tcon))
 149                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 150 out:
 151         return;
 152 }
 153
 154 static int
 155 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 156 {
 157         int rc = 0;
 158         struct nls_table *nls_codepage;
 159         struct cifs_ses *ses;
 160         struct TCP_Server_Info *server;
 161
 162         /*
 163          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 164          * check for tcp and smb session status done differently
 165          * for those three - in the calling routine.
 166          */
 167         if (tcon == NULL)
 168                 return rc;
 169
 170         if (smb2_command == SMB2_TREE_CONNECT)
 171                 return rc;
 172
 173         if (tcon->tidStatus == CifsExiting) {
 174                 /*
 175                  * only tree disconnect, open, and write,
 176                  * (and ulogoff which does not have tcon)
 177                  * are allowed as we start force umount.
 178                  */
 179                 if ((smb2_command != SMB2_WRITE) &&
 180                    (smb2_command != SMB2_CREATE) &&
 181                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 182                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 183                                  smb2_command);
 184                         return -ENODEV;
 185                 }
 186         }
 187         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 188             (!tcon->ses->server))
 189                 return -EIO;
 190
 191         ses = tcon->ses;
 192         server = ses->server;
 193
 194         /*
 195          * Give demultiplex thread up to 10 seconds to reconnect, should be
 196          * greater than cifs socket timeout which is 7 seconds
 197          */
 198         while (server->tcpStatus == CifsNeedReconnect) {
 199                 /*
 200                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 201                  * here since they are implicitly done when session drops.
 202                  */
 203                 switch (smb2_command) {
 204                 /*
 205                  * BB Should we keep oplock break and add flush to exceptions?
 206                  */
 207                 case SMB2_TREE_DISCONNECT:
 208                 case SMB2_CANCEL:
 209                 case SMB2_CLOSE:
 210                 case SMB2_OPLOCK_BREAK:
 211                         return -EAGAIN;
 212                 }
 213
 214                 wait_event_interruptible_timeout(server->response_q,
 215                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 216
 217                 /* are we still trying to reconnect? */
 218                 if (server->tcpStatus != CifsNeedReconnect)
 219                         break;
 220
 221                 /*
 222                  * on "soft" mounts we wait once. Hard mounts keep
 223                  * retrying until process is killed or server comes
 224                  * back on-line
 225                  */
 226                 if (!tcon->retry) {
 227                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 228                         return -EHOSTDOWN;
 229                 }
 230         }
 231
 232         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 233                 return rc;
 234
 235         nls_codepage = load_nls_default();
 236
 237         /*
 238          * need to prevent multiple threads trying to simultaneously reconnect
 239          * the same SMB session
 240          */
 241         mutex_lock(&tcon->ses->session_mutex);
 242
 243         /*
 244          * Recheck after acquire mutex. If another thread is negotiating
 245          * and the server never sends an answer the socket will be closed
 246          * and tcpStatus set to reconnect.
 247          */
 248         if (server->tcpStatus == CifsNeedReconnect) {
 249                 rc = -EHOSTDOWN;
 250                 mutex_unlock(&tcon->ses->session_mutex);
 251                 goto out;
 252         }
 253
 254         rc = cifs_negotiate_protocol(0, tcon->ses);
 255         if (!rc && tcon->ses->need_reconnect)
 256                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 257
 258         if (rc || !tcon->need_reconnect) {
 259                 mutex_unlock(&tcon->ses->session_mutex);
 260                 goto out;
 261         }
 262
 263         cifs_mark_open_files_invalid(tcon);
 264         if (tcon->use_persistent)
 265                 tcon->need_reopen_files = true;
 266
 267         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 268         mutex_unlock(&tcon->ses->session_mutex);
 269
 270         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 271         if (rc) {
 272                 /* If sess reconnected but tcon didn't, something strange ... */
 273                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 274                 goto out;
 275         }
 276
 277         if (smb2_command != SMB2_INTERNAL_CMD)
 278                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 279
 280         atomic_inc(&tconInfoReconnectCount);
 281 out:
 282         /*
 283          * Check if handle based operation so we know whether we can continue
 284          * or not without returning to caller to reset file handle.
 285          */
 286         /*
 287          * BB Is flush done by server on drop of tcp session? Should we special
 288          * case it and skip above?
 289          */
 290         switch (smb2_command) {
 291         case SMB2_FLUSH:
 292         case SMB2_READ:
 293         case SMB2_WRITE:
 294         case SMB2_LOCK:
 295         case SMB2_IOCTL:
 296         case SMB2_QUERY_DIRECTORY:
 297         case SMB2_CHANGE_NOTIFY:
 298         case SMB2_QUERY_INFO:
 299         case SMB2_SET_INFO:
 300                 rc = -EAGAIN;
 301         }
 302         unload_nls(nls_codepage);
 303         return rc;
 304 }
 305
 306 static void
 307 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 308                unsigned int *total_len)
 309 {
 310         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 311         /* lookup word count ie StructureSize from table */
 312         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 313
 314         /*
 315          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 316          * largest operations (Create)
 317          */
 318         memset(buf, 0, 256);
 319
 320         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 321         spdu->StructureSize2 = cpu_to_le16(parmsize);
 322
 323         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 324 }
 325
 326 /*
 327  * Allocate and return pointer to an SMB request hdr, and set basic
 328  * SMB information in the SMB header. If the return code is zero, this
 329  * function must have filled in request_buf pointer.
 330  */
 331 static int
 332 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 333                     void **request_buf, unsigned int *total_len)
 334 {
 335         int rc;
 336
 337         rc = smb2_reconnect(smb2_command, tcon);
 338         if (rc)
 339                 return rc;
 340
 341         /* BB eventually switch this to SMB2 specific small buf size */
 342         *request_buf = cifs_small_buf_get();
 343         if (*request_buf == NULL) {
 344                 /* BB should we add a retry in here if not a writepage? */
 345                 return -ENOMEM;
 346         }
 347
 348         fill_small_buf(smb2_command, tcon,
 349                        (struct smb2_sync_hdr *)(*request_buf),
 350                        total_len);
 351
 352         if (tcon != NULL) {
 353 #ifdef CONFIG_CIFS_STATS2
 354                 uint16_t com_code = le16_to_cpu(smb2_command);
 355                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 356 #endif
 357                 cifs_stats_inc(&tcon->num_smbs_sent);
 358         }
 359
 360         return rc;
 361 }
 362
 363 #ifdef CONFIG_CIFS_SMB311
 364 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 365 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 366
 367
 368 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 369 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 370
 371 static void
 372 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 373 {
 374         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 375         pneg_ctxt->DataLength = cpu_to_le16(38);
 376         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 377         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 378         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 379         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 380 }
 381
 382 static void
 383 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 384 {
 385         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 386         pneg_ctxt->DataLength = cpu_to_le16(6);
 387         pneg_ctxt->CipherCount = cpu_to_le16(2);
 388         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 389         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 390 }
 391
 392 static void
 393 assemble_neg_contexts(struct smb2_negotiate_req *req,
 394                       unsigned int *total_len)
 395 {
 396         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 397
 398         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 399         /* Add 2 to size to round to 8 byte boundary */
 400
 401         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 402         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 403         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 404         req->NegotiateContextCount = cpu_to_le16(2);
 405
 406         *total_len += 4 + sizeof(struct smb2_preauth_neg_context)
 407                 + sizeof(struct smb2_encryption_neg_context);
 408 }
 409
 410 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 411 {
 412         unsigned int len = le16_to_cpu(ctxt->DataLength);
 413
 414         /* If invalid preauth context warn but use what we requested, SHA-512 */
 415         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 416                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 417                 return;
 418         }
 419         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 420                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 421         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 422                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 423 }
 424
 425 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 426                               struct smb2_encryption_neg_context *ctxt)
 427 {
 428         unsigned int len = le16_to_cpu(ctxt->DataLength);
 429
 430         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 431         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 432                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 433                 return -EINVAL;
 434         }
 435
 436         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 437                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 438                 return -EINVAL;
 439         }
 440         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 441         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 442             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 443                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 444                 return -EINVAL;
 445         }
 446         server->cipher_type = ctxt->Ciphers[0];
 447         return 0;
 448 }
 449
 450 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 451                                      struct TCP_Server_Info *server)
 452 {
 453         struct smb2_neg_context *pctx;
 454         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 455         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 456         unsigned int len_of_smb = be32_to_cpu(rsp->hdr.smb2_buf_length);
 457         unsigned int len_of_ctxts, i;
 458         int rc = 0;
 459
 460         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 461         if (len_of_smb <= offset) {
 462                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 463                 return -EINVAL;
 464         }
 465
 466         len_of_ctxts = len_of_smb - offset;
 467
 468         for (i = 0; i < ctxt_cnt; i++) {
 469                 int clen;
 470                 /* check that offset is not beyond end of SMB */
 471                 if (len_of_ctxts == 0)
 472                         break;
 473
 474                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 475                         break;
 476
 477                 pctx = (struct smb2_neg_context *)(offset +
 478                         server->vals->header_preamble_size + (char *)rsp);
 479                 clen = le16_to_cpu(pctx->DataLength);
 480                 if (clen > len_of_ctxts)
 481                         break;
 482
 483                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 484                         decode_preauth_context(
 485                                 (struct smb2_preauth_neg_context *)pctx);
 486                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 487                         rc = decode_encrypt_ctx(server,
 488                                 (struct smb2_encryption_neg_context *)pctx);
 489                 else
 490                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 491                                 le16_to_cpu(pctx->ContextType));
 492
 493                 if (rc)
 494                         break;
 495                 /* offsets must be 8 byte aligned */
 496                 clen = (clen + 7) & ~0x7;
 497                 offset += clen + sizeof(struct smb2_neg_context);
 498                 len_of_ctxts -= clen;
 499         }
 500         return rc;
 501 }
 502
 503 #else
 504 static void assemble_neg_contexts(struct smb2_negotiate_req *req,
 505                                   unsigned int *total_len)
 506 {
 507         return;
 508 }
 509 #endif /* SMB311 */
 510
 511 /*
 512  *
 513  *      SMB2 Worker functions follow:
 514  *
 515  *      The general structure of the worker functions is:
 516  *      1) Call smb2_init (assembles SMB2 header)
 517  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 518  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 519  *      4) Decode SMB2 command specific fields in the fixed length area
 520  *      5) Decode variable length data area (if any for this SMB2 command type)
 521  *      6) Call free smb buffer
 522  *      7) return
 523  *
 524  */
 525
 526 int
 527 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 528 {
 529         struct smb2_negotiate_req *req;
 530         struct smb2_negotiate_rsp *rsp;
 531         struct kvec iov[1];
 532         struct kvec rsp_iov;
 533         int rc = 0;
 534         int resp_buftype;
 535         struct TCP_Server_Info *server = ses->server;
 536         int blob_offset, blob_length;
 537         char *security_blob;
 538         int flags = CIFS_NEG_OP;
 539         unsigned int total_len;
 540
 541         cifs_dbg(FYI, "Negotiate protocol\n");
 542
 543         if (!server) {
 544                 WARN(1, "%s: server is NULL!\n", __func__);
 545                 return -EIO;
 546         }
 547
 548         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 549         if (rc)
 550                 return rc;
 551
 552         req->sync_hdr.SessionId = 0;
 553 #ifdef CONFIG_CIFS_SMB311
 554         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 555         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 556 #endif
 557
 558         if (strcmp(ses->server->vals->version_string,
 559                    SMB3ANY_VERSION_STRING) == 0) {
 560                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 561                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 562                 req->DialectCount = cpu_to_le16(2);
 563                 total_len += 4;
 564         } else if (strcmp(ses->server->vals->version_string,
 565                    SMBDEFAULT_VERSION_STRING) == 0) {
 566                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 567                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 568                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 569                 req->DialectCount = cpu_to_le16(3);
 570                 total_len += 6;
 571         } else {
 572                 /* otherwise send specific dialect */
 573                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 574                 req->DialectCount = cpu_to_le16(1);
 575                 total_len += 2;
 576         }
 577
 578         /* only one of SMB2 signing flags may be set in SMB2 request */
 579         if (ses->sign)
 580                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 581         else if (global_secflags & CIFSSEC_MAY_SIGN)
 582                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 583         else
 584                 req->SecurityMode = 0;
 585
 586         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 587
 588         /* ClientGUID must be zero for SMB2.02 dialect */
 589         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 590                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 591         else {
 592                 memcpy(req->ClientGUID, server->client_guid,
 593                         SMB2_CLIENT_GUID_SIZE);
 594                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 595                         assemble_neg_contexts(req, &total_len);
 596         }
 597         iov[0].iov_base = (char *)req;
 598         iov[0].iov_len = total_len;
 599
 600         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
 601         cifs_small_buf_release(req);
 602         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 603         /*
 604          * No tcon so can't do
 605          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 606          */
 607         if (rc == -EOPNOTSUPP) {
 608                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 609                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 610                         " older servers\n");
 611                 goto neg_exit;
 612         } else if (rc != 0)
 613                 goto neg_exit;
 614
 615         if (strcmp(ses->server->vals->version_string,
 616                    SMB3ANY_VERSION_STRING) == 0) {
 617                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 618                         cifs_dbg(VFS,
 619                                 "SMB2 dialect returned but not requested\n");
 620                         return -EIO;
 621                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 622                         cifs_dbg(VFS,
 623                                 "SMB2.1 dialect returned but not requested\n");
 624                         return -EIO;
 625                 }
 626         } else if (strcmp(ses->server->vals->version_string,
 627                    SMBDEFAULT_VERSION_STRING) == 0) {
 628                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 629                         cifs_dbg(VFS,
 630                                 "SMB2 dialect returned but not requested\n");
 631                         return -EIO;
 632                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 633                         /* ops set to 3.0 by default for default so update */
 634                         ses->server->ops = &smb21_operations;
 635                 }
 636         } else if (le16_to_cpu(rsp->DialectRevision) !=
 637                                 ses->server->vals->protocol_id) {
 638                 /* if requested single dialect ensure returned dialect matched */
 639                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 640                         le16_to_cpu(rsp->DialectRevision));
 641                 return -EIO;
 642         }
 643
 644         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 645
 646         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 647                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 648         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 649                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 650         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 651                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 652         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 653                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 654 #ifdef CONFIG_CIFS_SMB311
 655         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 656                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 657 #endif /* SMB311 */
 658         else {
 659                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 660                          le16_to_cpu(rsp->DialectRevision));
 661                 rc = -EIO;
 662                 goto neg_exit;
 663         }
 664         server->dialect = le16_to_cpu(rsp->DialectRevision);
 665
 666         /* BB: add check that dialect was valid given dialect(s) we asked for */
 667
 668 #ifdef CONFIG_CIFS_SMB311
 669         /*
 670          * Keep a copy of the hash after negprot. This hash will be
 671          * the starting hash value for all sessions made from this
 672          * server.
 673          */
 674         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 675                SMB2_PREAUTH_HASH_SIZE);
 676 #endif
 677         /* SMB2 only has an extended negflavor */
 678         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 679         /* set it to the maximum buffer size value we can send with 1 credit */
 680         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 681                                SMB2_MAX_BUFFER_SIZE);
 682         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 683         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 684         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 685         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 686                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 687                                 server->sec_mode);
 688         server->capabilities = le32_to_cpu(rsp->Capabilities);
 689         /* Internal types */
 690         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 691
 692         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 693                                                &rsp->hdr);
 694         /*
 695          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 696          * for us will be
 697          *      ses->sectype = RawNTLMSSP;
 698          * but for time being this is our only auth choice so doesn't matter.
 699          * We just found a server which sets blob length to zero expecting raw.
 700          */
 701         if (blob_length == 0) {
 702                 cifs_dbg(FYI, "missing security blob on negprot\n");
 703                 server->sec_ntlmssp = true;
 704         }
 705
 706         rc = cifs_enable_signing(server, ses->sign);
 707         if (rc)
 708                 goto neg_exit;
 709         if (blob_length) {
 710                 rc = decode_negTokenInit(security_blob, blob_length, server);
 711                 if (rc == 1)
 712                         rc = 0;
 713                 else if (rc == 0)
 714                         rc = -EIO;
 715         }
 716
 717 #ifdef CONFIG_CIFS_SMB311
 718         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 719                 if (rsp->NegotiateContextCount)
 720                         rc = smb311_decode_neg_context(rsp, server);
 721                 else
 722                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 723         }
 724 #endif /* CONFIG_CIFS_SMB311 */
 725 neg_exit:
 726         free_rsp_buf(resp_buftype, rsp);
 727         return rc;
 728 }
 729
 730 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 731 {
 732         int rc = 0;
 733         struct validate_negotiate_info_req vneg_inbuf;
 734         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 735         u32 rsplen;
 736         u32 inbuflen; /* max of 4 dialects */
 737
 738         cifs_dbg(FYI, "validate negotiate\n");
 739
 740 #ifdef CONFIG_CIFS_SMB_DIRECT
 741         if (tcon->ses->server->rdma)
 742                 return 0;
 743 #endif
 744
 745         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 746         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 747                 return 0;
 748
 749         /*
 750          * validation ioctl must be signed, so no point sending this if we
 751          * can not sign it (ie are not known user).  Even if signing is not
 752          * required (enabled but not negotiated), in those cases we selectively
 753          * sign just this, the first and only signed request on a connection.
 754          * Having validation of negotiate info  helps reduce attack vectors.
 755          */
 756         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 757                 return 0; /* validation requires signing */
 758
 759         if (tcon->ses->user_name == NULL) {
 760                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 761                 return 0; /* validation requires signing */
 762         }
 763
 764         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 765                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 766
 767         vneg_inbuf.Capabilities =
 768                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 769         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 770                                         SMB2_CLIENT_GUID_SIZE);
 771
 772         if (tcon->ses->sign)
 773                 vneg_inbuf.SecurityMode =
 774                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 775         else if (global_secflags & CIFSSEC_MAY_SIGN)
 776                 vneg_inbuf.SecurityMode =
 777                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 778         else
 779                 vneg_inbuf.SecurityMode = 0;
 780
 781
 782         if (strcmp(tcon->ses->server->vals->version_string,
 783                 SMB3ANY_VERSION_STRING) == 0) {
 784                 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 785                 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 786                 vneg_inbuf.DialectCount = cpu_to_le16(2);
 787                 /* structure is big enough for 3 dialects, sending only 2 */
 788                 inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
 789         } else if (strcmp(tcon->ses->server->vals->version_string,
 790                 SMBDEFAULT_VERSION_STRING) == 0) {
 791                 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 792                 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 793                 vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 794                 vneg_inbuf.DialectCount = cpu_to_le16(3);
 795                 /* structure is big enough for 3 dialects */
 796                 inbuflen = sizeof(struct validate_negotiate_info_req);
 797         } else {
 798                 /* otherwise specific dialect was requested */
 799                 vneg_inbuf.Dialects[0] =
 800                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 801                 vneg_inbuf.DialectCount = cpu_to_le16(1);
 802                 /* structure is big enough for 3 dialects, sending only 1 */
 803                 inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
 804         }
 805
 806         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 807                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 808                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 809                 (char **)&pneg_rsp, &rsplen);
 810
 811         if (rc != 0) {
 812                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 813                 return -EIO;
 814         }
 815
 816         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 817                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 818                          rsplen);
 819
 820                 /* relax check since Mac returns max bufsize allowed on ioctl */
 821                 if ((rsplen > CIFSMaxBufSize)
 822                      || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
 823                         goto err_rsp_free;
 824         }
 825
 826         /* check validate negotiate info response matches what we got earlier */
 827         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 828                 goto vneg_out;
 829
 830         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 831                 goto vneg_out;
 832
 833         /* do not validate server guid because not saved at negprot time yet */
 834
 835         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 836               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 837                 goto vneg_out;
 838
 839         /* validate negotiate successful */
 840         cifs_dbg(FYI, "validate negotiate info successful\n");
 841         kfree(pneg_rsp);
 842         return 0;
 843
 844 vneg_out:
 845         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 846 err_rsp_free:
 847         kfree(pneg_rsp);
 848         return -EIO;
 849 }
 850
 851 enum securityEnum
 852 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 853 {
 854         switch (requested) {
 855         case Kerberos:
 856         case RawNTLMSSP:
 857                 return requested;
 858         case NTLMv2:
 859                 return RawNTLMSSP;
 860         case Unspecified:
 861                 if (server->sec_ntlmssp &&
 862                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 863                         return RawNTLMSSP;
 864                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 865                         (global_secflags & CIFSSEC_MAY_KRB5))
 866                         return Kerberos;
 867                 /* Fallthrough */
 868         default:
 869                 return Unspecified;
 870         }
 871 }
 872
 873 struct SMB2_sess_data {
 874         unsigned int xid;
 875         struct cifs_ses *ses;
 876         struct nls_table *nls_cp;
 877         void (*func)(struct SMB2_sess_data *);
 878         int result;
 879         u64 previous_session;
 880
 881         /* we will send the SMB in three pieces:
 882          * a fixed length beginning part, an optional
 883          * SPNEGO blob (which can be zero length), and a
 884          * last part which will include the strings
 885          * and rest of bcc area. This allows us to avoid
 886          * a large buffer 17K allocation
 887          */
 888         int buf0_type;
 889         struct kvec iov[2];
 890 };
 891
 892 static int
 893 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 894 {
 895         int rc;
 896         struct cifs_ses *ses = sess_data->ses;
 897         struct smb2_sess_setup_req *req;
 898         struct TCP_Server_Info *server = ses->server;
 899         unsigned int total_len;
 900
 901         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 902                              &total_len);
 903         if (rc)
 904                 return rc;
 905
 906         /* First session, not a reauthenticate */
 907         req->sync_hdr.SessionId = 0;
 908
 909         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 910         req->PreviousSessionId = sess_data->previous_session;
 911
 912         req->Flags = 0; /* MBZ */
 913         /* to enable echos and oplocks */
 914         req->sync_hdr.CreditRequest = cpu_to_le16(3);
 915
 916         /* only one of SMB2 signing flags may be set in SMB2 request */
 917         if (server->sign)
 918                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 919         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 920                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 921         else
 922                 req->SecurityMode = 0;
 923
 924         req->Capabilities = 0;
 925         req->Channel = 0; /* MBZ */
 926
 927         sess_data->iov[0].iov_base = (char *)req;
 928         /* 1 for pad */
 929         sess_data->iov[0].iov_len = total_len - 1;
 930         /*
 931          * This variable will be used to clear the buffer
 932          * allocated above in case of any error in the calling function.
 933          */
 934         sess_data->buf0_type = CIFS_SMALL_BUFFER;
 935
 936         return 0;
 937 }
 938
 939 static void
 940 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
 941 {
 942         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
 943         sess_data->buf0_type = CIFS_NO_BUFFER;
 944 }
 945
 946 static int
 947 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
 948 {
 949         int rc;
 950         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
 951         struct kvec rsp_iov = { NULL, 0 };
 952
 953         /* Testing shows that buffer offset must be at location of Buffer[0] */
 954         req->SecurityBufferOffset =
 955                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
 956         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
 957
 958         /* BB add code to build os and lm fields */
 959
 960         rc = smb2_send_recv(sess_data->xid, sess_data->ses,
 961                             sess_data->iov, 2,
 962                             &sess_data->buf0_type,
 963                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
 964         cifs_small_buf_release(sess_data->iov[0].iov_base);
 965         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
 966
 967         return rc;
 968 }
 969
 970 static int
 971 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
 972 {
 973         int rc = 0;
 974         struct cifs_ses *ses = sess_data->ses;
 975
 976         mutex_lock(&ses->server->srv_mutex);
 977         if (ses->server->ops->generate_signingkey) {
 978                 rc = ses->server->ops->generate_signingkey(ses);
 979                 if (rc) {
 980                         cifs_dbg(FYI,
 981                                 "SMB3 session key generation failed\n");
 982                         mutex_unlock(&ses->server->srv_mutex);
 983                         return rc;
 984                 }
 985         }
 986         if (!ses->server->session_estab) {
 987                 ses->server->sequence_number = 0x2;
 988                 ses->server->session_estab = true;
 989         }
 990         mutex_unlock(&ses->server->srv_mutex);
 991
 992         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 993         spin_lock(&GlobalMid_Lock);
 994         ses->status = CifsGood;
 995         ses->need_reconnect = false;
 996         spin_unlock(&GlobalMid_Lock);
 997         return rc;
 998 }
 999
1000 #ifdef CONFIG_CIFS_UPCALL
1001 static void
1002 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1003 {
1004         int rc;
1005         struct cifs_ses *ses = sess_data->ses;
1006         struct cifs_spnego_msg *msg;
1007         struct key *spnego_key = NULL;
1008         struct smb2_sess_setup_rsp *rsp = NULL;
1009
1010         rc = SMB2_sess_alloc_buffer(sess_data);
1011         if (rc)
1012                 goto out;
1013
1014         spnego_key = cifs_get_spnego_key(ses);
1015         if (IS_ERR(spnego_key)) {
1016                 rc = PTR_ERR(spnego_key);
1017                 spnego_key = NULL;
1018                 goto out;
1019         }
1020
1021         msg = spnego_key->payload.data[0];
1022         /*
1023          * check version field to make sure that cifs.upcall is
1024          * sending us a response in an expected form
1025          */
1026         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1027                 cifs_dbg(VFS,
1028                           "bad cifs.upcall version. Expected %d got %d",
1029                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1030                 rc = -EKEYREJECTED;
1031                 goto out_put_spnego_key;
1032         }
1033
1034         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1035                                          GFP_KERNEL);
1036         if (!ses->auth_key.response) {
1037                 cifs_dbg(VFS,
1038                         "Kerberos can't allocate (%u bytes) memory",
1039                         msg->sesskey_len);
1040                 rc = -ENOMEM;
1041                 goto out_put_spnego_key;
1042         }
1043         ses->auth_key.len = msg->sesskey_len;
1044
1045         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1046         sess_data->iov[1].iov_len = msg->secblob_len;
1047
1048         rc = SMB2_sess_sendreceive(sess_data);
1049         if (rc)
1050                 goto out_put_spnego_key;
1051
1052         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1053         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1054
1055         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1056
1057         rc = SMB2_sess_establish_session(sess_data);
1058 out_put_spnego_key:
1059         key_invalidate(spnego_key);
1060         key_put(spnego_key);
1061 out:
1062         sess_data->result = rc;
1063         sess_data->func = NULL;
1064         SMB2_sess_free_buffer(sess_data);
1065 }
1066 #else
1067 static void
1068 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1069 {
1070         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1071         sess_data->result = -EOPNOTSUPP;
1072         sess_data->func = NULL;
1073 }
1074 #endif
1075
1076 static void
1077 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1078
1079 static void
1080 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1081 {
1082         int rc;
1083         struct cifs_ses *ses = sess_data->ses;
1084         struct smb2_sess_setup_rsp *rsp = NULL;
1085         char *ntlmssp_blob = NULL;
1086         bool use_spnego = false; /* else use raw ntlmssp */
1087         u16 blob_length = 0;
1088
1089         /*
1090          * If memory allocation is successful, caller of this function
1091          * frees it.
1092          */
1093         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1094         if (!ses->ntlmssp) {
1095                 rc = -ENOMEM;
1096                 goto out_err;
1097         }
1098         ses->ntlmssp->sesskey_per_smbsess = true;
1099
1100         rc = SMB2_sess_alloc_buffer(sess_data);
1101         if (rc)
1102                 goto out_err;
1103
1104         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1105                                GFP_KERNEL);
1106         if (ntlmssp_blob == NULL) {
1107                 rc = -ENOMEM;
1108                 goto out;
1109         }
1110
1111         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1112         if (use_spnego) {
1113                 /* BB eventually need to add this */
1114                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1115                 rc = -EOPNOTSUPP;
1116                 goto out;
1117         } else {
1118                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1119                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1120         }
1121         sess_data->iov[1].iov_base = ntlmssp_blob;
1122         sess_data->iov[1].iov_len = blob_length;
1123
1124         rc = SMB2_sess_sendreceive(sess_data);
1125         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1126
1127         /* If true, rc here is expected and not an error */
1128         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1129                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1130                 rc = 0;
1131
1132         if (rc)
1133                 goto out;
1134
1135         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - ses->server->vals->header_preamble_size !=
1136                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1137                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1138                         le16_to_cpu(rsp->SecurityBufferOffset));
1139                 rc = -EIO;
1140                 goto out;
1141         }
1142         rc = decode_ntlmssp_challenge(rsp->Buffer,
1143                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1144         if (rc)
1145                 goto out;
1146
1147         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1148
1149
1150         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1151         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1152
1153 out:
1154         kfree(ntlmssp_blob);
1155         SMB2_sess_free_buffer(sess_data);
1156         if (!rc) {
1157                 sess_data->result = 0;
1158                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1159                 return;
1160         }
1161 out_err:
1162         kfree(ses->ntlmssp);
1163         ses->ntlmssp = NULL;
1164         sess_data->result = rc;
1165         sess_data->func = NULL;
1166 }
1167
1168 static void
1169 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1170 {
1171         int rc;
1172         struct cifs_ses *ses = sess_data->ses;
1173         struct smb2_sess_setup_req *req;
1174         struct smb2_sess_setup_rsp *rsp = NULL;
1175         unsigned char *ntlmssp_blob = NULL;
1176         bool use_spnego = false; /* else use raw ntlmssp */
1177         u16 blob_length = 0;
1178
1179         rc = SMB2_sess_alloc_buffer(sess_data);
1180         if (rc)
1181                 goto out;
1182
1183         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1184         req->sync_hdr.SessionId = ses->Suid;
1185
1186         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1187                                         sess_data->nls_cp);
1188         if (rc) {
1189                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1190                 goto out;
1191         }
1192
1193         if (use_spnego) {
1194                 /* BB eventually need to add this */
1195                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1196                 rc = -EOPNOTSUPP;
1197                 goto out;
1198         }
1199         sess_data->iov[1].iov_base = ntlmssp_blob;
1200         sess_data->iov[1].iov_len = blob_length;
1201
1202         rc = SMB2_sess_sendreceive(sess_data);
1203         if (rc)
1204                 goto out;
1205
1206         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1207
1208         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1209         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1210
1211         rc = SMB2_sess_establish_session(sess_data);
1212 out:
1213         kfree(ntlmssp_blob);
1214         SMB2_sess_free_buffer(sess_data);
1215         kfree(ses->ntlmssp);
1216         ses->ntlmssp = NULL;
1217         sess_data->result = rc;
1218         sess_data->func = NULL;
1219 }
1220
1221 static int
1222 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1223 {
1224         int type;
1225
1226         type = smb2_select_sectype(ses->server, ses->sectype);
1227         cifs_dbg(FYI, "sess setup type %d\n", type);
1228         if (type == Unspecified) {
1229                 cifs_dbg(VFS,
1230                         "Unable to select appropriate authentication method!");
1231                 return -EINVAL;
1232         }
1233
1234         switch (type) {
1235         case Kerberos:
1236                 sess_data->func = SMB2_auth_kerberos;
1237                 break;
1238         case RawNTLMSSP:
1239                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1240                 break;
1241         default:
1242                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1243                 return -EOPNOTSUPP;
1244         }
1245
1246         return 0;
1247 }
1248
1249 int
1250 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1251                 const struct nls_table *nls_cp)
1252 {
1253         int rc = 0;
1254         struct TCP_Server_Info *server = ses->server;
1255         struct SMB2_sess_data *sess_data;
1256
1257         cifs_dbg(FYI, "Session Setup\n");
1258
1259         if (!server) {
1260                 WARN(1, "%s: server is NULL!\n", __func__);
1261                 return -EIO;
1262         }
1263
1264         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1265         if (!sess_data)
1266                 return -ENOMEM;
1267
1268         rc = SMB2_select_sec(ses, sess_data);
1269         if (rc)
1270                 goto out;
1271         sess_data->xid = xid;
1272         sess_data->ses = ses;
1273         sess_data->buf0_type = CIFS_NO_BUFFER;
1274         sess_data->nls_cp = (struct nls_table *) nls_cp;
1275
1276 #ifdef CONFIG_CIFS_SMB311
1277         /*
1278          * Initialize the session hash with the server one.
1279          */
1280         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1281                SMB2_PREAUTH_HASH_SIZE);
1282 #endif
1283
1284         while (sess_data->func)
1285                 sess_data->func(sess_data);
1286
1287         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1288                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1289         rc = sess_data->result;
1290 out:
1291         kfree(sess_data);
1292         return rc;
1293 }
1294
1295 int
1296 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1297 {
1298         struct smb2_logoff_req *req; /* response is also trivial struct */
1299         int rc = 0;
1300         struct TCP_Server_Info *server;
1301         int flags = 0;
1302         unsigned int total_len;
1303         struct kvec iov[1];
1304         struct kvec rsp_iov;
1305         int resp_buf_type;
1306
1307         cifs_dbg(FYI, "disconnect session %p\n", ses);
1308
1309         if (ses && (ses->server))
1310                 server = ses->server;
1311         else
1312                 return -EIO;
1313
1314         /* no need to send SMB logoff if uid already closed due to reconnect */
1315         if (ses->need_reconnect)
1316                 goto smb2_session_already_dead;
1317
1318         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1319         if (rc)
1320                 return rc;
1321
1322          /* since no tcon, smb2_init can not do this, so do here */
1323         req->sync_hdr.SessionId = ses->Suid;
1324
1325         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1326                 flags |= CIFS_TRANSFORM_REQ;
1327         else if (server->sign)
1328                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1329
1330         flags |= CIFS_NO_RESP;
1331
1332         iov[0].iov_base = (char *)req;
1333         iov[0].iov_len = total_len;
1334
1335         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1336         cifs_small_buf_release(req);
1337         /*
1338          * No tcon so can't do
1339          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1340          */
1341
1342 smb2_session_already_dead:
1343         return rc;
1344 }
1345
1346 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1347 {
1348         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1349 }
1350
1351 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1352
1353 /* These are similar values to what Windows uses */
1354 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1355 {
1356         tcon->max_chunks = 256;
1357         tcon->max_bytes_chunk = 1048576;
1358         tcon->max_bytes_copy = 16777216;
1359 }
1360
1361 int
1362 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1363           struct cifs_tcon *tcon, const struct nls_table *cp)
1364 {
1365         struct smb2_tree_connect_req *req;
1366         struct smb2_tree_connect_rsp *rsp = NULL;
1367         struct kvec iov[2];
1368         struct kvec rsp_iov = { NULL, 0 };
1369         int rc = 0;
1370         int resp_buftype;
1371         int unc_path_len;
1372         __le16 *unc_path = NULL;
1373         int flags = 0;
1374         unsigned int total_len;
1375
1376         cifs_dbg(FYI, "TCON\n");
1377
1378         if (!(ses->server) || !tree)
1379                 return -EIO;
1380
1381         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1382         if (unc_path == NULL)
1383                 return -ENOMEM;
1384
1385         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1386         unc_path_len *= 2;
1387         if (unc_path_len < 2) {
1388                 kfree(unc_path);
1389                 return -EINVAL;
1390         }
1391
1392         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1393         tcon->tid = 0;
1394
1395         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1396                              &total_len);
1397         if (rc) {
1398                 kfree(unc_path);
1399                 return rc;
1400         }
1401
1402         if (encryption_required(tcon))
1403                 flags |= CIFS_TRANSFORM_REQ;
1404
1405         iov[0].iov_base = (char *)req;
1406         /* 1 for pad */
1407         iov[0].iov_len = total_len - 1;
1408
1409         /* Testing shows that buffer offset must be at location of Buffer[0] */
1410         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1411                         - 1 /* pad */);
1412         req->PathLength = cpu_to_le16(unc_path_len - 2);
1413         iov[1].iov_base = unc_path;
1414         iov[1].iov_len = unc_path_len;
1415
1416         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1417         if ((ses->server->dialect == SMB311_PROT_ID) &&
1418             !encryption_required(tcon))
1419                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1420
1421         rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1422         cifs_small_buf_release(req);
1423         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1424
1425         if (rc != 0) {
1426                 if (tcon) {
1427                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1428                         tcon->need_reconnect = true;
1429                 }
1430                 goto tcon_error_exit;
1431         }
1432
1433         switch (rsp->ShareType) {
1434         case SMB2_SHARE_TYPE_DISK:
1435                 cifs_dbg(FYI, "connection to disk share\n");
1436                 break;
1437         case SMB2_SHARE_TYPE_PIPE:
1438                 tcon->pipe = true;
1439                 cifs_dbg(FYI, "connection to pipe share\n");
1440                 break;
1441         case SMB2_SHARE_TYPE_PRINT:
1442                 tcon->print = true;
1443                 cifs_dbg(FYI, "connection to printer\n");
1444                 break;
1445         default:
1446                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1447                 rc = -EOPNOTSUPP;
1448                 goto tcon_error_exit;
1449         }
1450
1451         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1452         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1453         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1454         tcon->tidStatus = CifsGood;
1455         tcon->need_reconnect = false;
1456         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1457         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1458
1459         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1460             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1461                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1462
1463         if (tcon->seal &&
1464             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1465                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1466
1467         init_copy_chunk_defaults(tcon);
1468         if (tcon->ses->server->ops->validate_negotiate)
1469                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1470 tcon_exit:
1471         free_rsp_buf(resp_buftype, rsp);
1472         kfree(unc_path);
1473         return rc;
1474
1475 tcon_error_exit:
1476         if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1477                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1478         }
1479         goto tcon_exit;
1480 }
1481
1482 int
1483 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1484 {
1485         struct smb2_tree_disconnect_req *req; /* response is trivial */
1486         int rc = 0;
1487         struct cifs_ses *ses = tcon->ses;
1488         int flags = 0;
1489         unsigned int total_len;
1490         struct kvec iov[1];
1491         struct kvec rsp_iov;
1492         int resp_buf_type;
1493
1494         cifs_dbg(FYI, "Tree Disconnect\n");
1495
1496         if (!ses || !(ses->server))
1497                 return -EIO;
1498
1499         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1500                 return 0;
1501
1502         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1503                              &total_len);
1504         if (rc)
1505                 return rc;
1506
1507         if (encryption_required(tcon))
1508                 flags |= CIFS_TRANSFORM_REQ;
1509
1510         flags |= CIFS_NO_RESP;
1511
1512         iov[0].iov_base = (char *)req;
1513         iov[0].iov_len = total_len;
1514
1515         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1516         cifs_small_buf_release(req);
1517         if (rc)
1518                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1519
1520         return rc;
1521 }
1522
1523
1524 static struct create_durable *
1525 create_durable_buf(void)
1526 {
1527         struct create_durable *buf;
1528
1529         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1530         if (!buf)
1531                 return NULL;
1532
1533         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1534                                         (struct create_durable, Data));
1535         buf->ccontext.DataLength = cpu_to_le32(16);
1536         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1537                                 (struct create_durable, Name));
1538         buf->ccontext.NameLength = cpu_to_le16(4);
1539         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1540         buf->Name[0] = 'D';
1541         buf->Name[1] = 'H';
1542         buf->Name[2] = 'n';
1543         buf->Name[3] = 'Q';
1544         return buf;
1545 }
1546
1547 static struct create_durable *
1548 create_reconnect_durable_buf(struct cifs_fid *fid)
1549 {
1550         struct create_durable *buf;
1551
1552         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1553         if (!buf)
1554                 return NULL;
1555
1556         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1557                                         (struct create_durable, Data));
1558         buf->ccontext.DataLength = cpu_to_le32(16);
1559         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1560                                 (struct create_durable, Name));
1561         buf->ccontext.NameLength = cpu_to_le16(4);
1562         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1563         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1564         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1565         buf->Name[0] = 'D';
1566         buf->Name[1] = 'H';
1567         buf->Name[2] = 'n';
1568         buf->Name[3] = 'C';
1569         return buf;
1570 }
1571
1572 static __u8
1573 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1574                   unsigned int *epoch)
1575 {
1576         char *data_offset;
1577         struct create_context *cc;
1578         unsigned int next;
1579         unsigned int remaining;
1580         char *name;
1581
1582         data_offset = (char *)rsp + server->vals->header_preamble_size + le32_to_cpu(rsp->CreateContextsOffset);
1583         remaining = le32_to_cpu(rsp->CreateContextsLength);
1584         cc = (struct create_context *)data_offset;
1585         while (remaining >= sizeof(struct create_context)) {
1586                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1587                 if (le16_to_cpu(cc->NameLength) == 4 &&
1588                     strncmp(name, "RqLs", 4) == 0)
1589                         return server->ops->parse_lease_buf(cc, epoch);
1590
1591                 next = le32_to_cpu(cc->Next);
1592                 if (!next)
1593                         break;
1594                 remaining -= next;
1595                 cc = (struct create_context *)((char *)cc + next);
1596         }
1597
1598         return 0;
1599 }
1600
1601 static int
1602 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1603                   unsigned int *num_iovec, __u8 *oplock)
1604 {
1605         struct smb2_create_req *req = iov[0].iov_base;
1606         unsigned int num = *num_iovec;
1607
1608         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1609         if (iov[num].iov_base == NULL)
1610                 return -ENOMEM;
1611         iov[num].iov_len = server->vals->create_lease_size;
1612         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1613         if (!req->CreateContextsOffset)
1614                 req->CreateContextsOffset = cpu_to_le32(
1615                                 sizeof(struct smb2_create_req) +
1616                                 iov[num - 1].iov_len);
1617         le32_add_cpu(&req->CreateContextsLength,
1618                      server->vals->create_lease_size);
1619         *num_iovec = num + 1;
1620         return 0;
1621 }
1622
1623 static struct create_durable_v2 *
1624 create_durable_v2_buf(struct cifs_fid *pfid)
1625 {
1626         struct create_durable_v2 *buf;
1627
1628         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1629         if (!buf)
1630                 return NULL;
1631
1632         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1633                                         (struct create_durable_v2, dcontext));
1634         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1635         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1636                                 (struct create_durable_v2, Name));
1637         buf->ccontext.NameLength = cpu_to_le16(4);
1638
1639         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1640         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1641         generate_random_uuid(buf->dcontext.CreateGuid);
1642         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1643
1644         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1645         buf->Name[0] = 'D';
1646         buf->Name[1] = 'H';
1647         buf->Name[2] = '2';
1648         buf->Name[3] = 'Q';
1649         return buf;
1650 }
1651
1652 static struct create_durable_handle_reconnect_v2 *
1653 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1654 {
1655         struct create_durable_handle_reconnect_v2 *buf;
1656
1657         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1658                         GFP_KERNEL);
1659         if (!buf)
1660                 return NULL;
1661
1662         buf->ccontext.DataOffset =
1663                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1664                                      dcontext));
1665         buf->ccontext.DataLength =
1666                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1667         buf->ccontext.NameOffset =
1668                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1669                             Name));
1670         buf->ccontext.NameLength = cpu_to_le16(4);
1671
1672         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1673         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1674         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1675         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1676
1677         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1678         buf->Name[0] = 'D';
1679         buf->Name[1] = 'H';
1680         buf->Name[2] = '2';
1681         buf->Name[3] = 'C';
1682         return buf;
1683 }
1684
1685 static int
1686 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1687                     struct cifs_open_parms *oparms)
1688 {
1689         struct smb2_create_req *req = iov[0].iov_base;
1690         unsigned int num = *num_iovec;
1691
1692         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1693         if (iov[num].iov_base == NULL)
1694                 return -ENOMEM;
1695         iov[num].iov_len = sizeof(struct create_durable_v2);
1696         if (!req->CreateContextsOffset)
1697                 req->CreateContextsOffset =
1698                         cpu_to_le32(sizeof(struct smb2_create_req) +
1699                                                                 iov[1].iov_len);
1700         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1701         *num_iovec = num + 1;
1702         return 0;
1703 }
1704
1705 static int
1706 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1707                     struct cifs_open_parms *oparms)
1708 {
1709         struct smb2_create_req *req = iov[0].iov_base;
1710         unsigned int num = *num_iovec;
1711
1712         /* indicate that we don't need to relock the file */
1713         oparms->reconnect = false;
1714
1715         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1716         if (iov[num].iov_base == NULL)
1717                 return -ENOMEM;
1718         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1719         if (!req->CreateContextsOffset)
1720                 req->CreateContextsOffset =
1721                         cpu_to_le32(sizeof(struct smb2_create_req) +
1722                                                                 iov[1].iov_len);
1723         le32_add_cpu(&req->CreateContextsLength,
1724                         sizeof(struct create_durable_handle_reconnect_v2));
1725         *num_iovec = num + 1;
1726         return 0;
1727 }
1728
1729 static int
1730 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1731                     struct cifs_open_parms *oparms, bool use_persistent)
1732 {
1733         struct smb2_create_req *req = iov[0].iov_base;
1734         unsigned int num = *num_iovec;
1735
1736         if (use_persistent) {
1737                 if (oparms->reconnect)
1738                         return add_durable_reconnect_v2_context(iov, num_iovec,
1739                                                                 oparms);
1740                 else
1741                         return add_durable_v2_context(iov, num_iovec, oparms);
1742         }
1743
1744         if (oparms->reconnect) {
1745                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1746                 /* indicate that we don't need to relock the file */
1747                 oparms->reconnect = false;
1748         } else
1749                 iov[num].iov_base = create_durable_buf();
1750         if (iov[num].iov_base == NULL)
1751                 return -ENOMEM;
1752         iov[num].iov_len = sizeof(struct create_durable);
1753         if (!req->CreateContextsOffset)
1754                 req->CreateContextsOffset =
1755                         cpu_to_le32(sizeof(struct smb2_create_req) +
1756                                                                 iov[1].iov_len);
1757         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1758         *num_iovec = num + 1;
1759         return 0;
1760 }
1761
1762 static int
1763 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1764                             const char *treename, const __le16 *path)
1765 {
1766         int treename_len, path_len;
1767         struct nls_table *cp;
1768         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1769
1770         /*
1771          * skip leading "\\"
1772          */
1773         treename_len = strlen(treename);
1774         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1775                 return -EINVAL;
1776
1777         treename += 2;
1778         treename_len -= 2;
1779
1780         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1781
1782         /*
1783          * make room for one path separator between the treename and
1784          * path
1785          */
1786         *out_len = treename_len + 1 + path_len;
1787
1788         /*
1789          * final path needs to be null-terminated UTF16 with a
1790          * size aligned to 8
1791          */
1792
1793         *out_size = roundup((*out_len+1)*2, 8);
1794         *out_path = kzalloc(*out_size, GFP_KERNEL);
1795         if (!*out_path)
1796                 return -ENOMEM;
1797
1798         cp = load_nls_default();
1799         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1800         UniStrcat(*out_path, sep);
1801         UniStrcat(*out_path, path);
1802         unload_nls(cp);
1803
1804         return 0;
1805 }
1806
1807 int
1808 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1809           __u8 *oplock, struct smb2_file_all_info *buf,
1810           struct kvec *err_iov)
1811 {
1812         struct smb2_create_req *req;
1813         struct smb2_create_rsp *rsp;
1814         struct TCP_Server_Info *server;
1815         struct cifs_tcon *tcon = oparms->tcon;
1816         struct cifs_ses *ses = tcon->ses;
1817         struct kvec iov[4];
1818         struct kvec rsp_iov = {NULL, 0};
1819         int resp_buftype;
1820         int uni_path_len;
1821         __le16 *copy_path = NULL;
1822         int copy_size;
1823         int rc = 0;
1824         unsigned int n_iov = 2;
1825         __u32 file_attributes = 0;
1826         char *dhc_buf = NULL, *lc_buf = NULL;
1827         int flags = 0;
1828         unsigned int total_len;
1829
1830         cifs_dbg(FYI, "create/open\n");
1831
1832         if (ses && (ses->server))
1833                 server = ses->server;
1834         else
1835                 return -EIO;
1836
1837         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1838
1839         if (rc)
1840                 return rc;
1841
1842         if (encryption_required(tcon))
1843                 flags |= CIFS_TRANSFORM_REQ;
1844
1845         if (oparms->create_options & CREATE_OPTION_READONLY)
1846                 file_attributes |= ATTR_READONLY;
1847         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1848                 file_attributes |= ATTR_SYSTEM;
1849
1850         req->ImpersonationLevel = IL_IMPERSONATION;
1851         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1852         /* File attributes ignored on open (used in create though) */
1853         req->FileAttributes = cpu_to_le32(file_attributes);
1854         req->ShareAccess = FILE_SHARE_ALL_LE;
1855         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1856         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1857
1858         iov[0].iov_base = (char *)req;
1859         /* -1 since last byte is buf[0] which is sent below (path) */
1860         iov[0].iov_len = total_len - 1;
1861
1862         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1863
1864         /* [MS-SMB2] 2.2.13 NameOffset:
1865          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1866          * the SMB2 header, the file name includes a prefix that will
1867          * be processed during DFS name normalization as specified in
1868          * section 3.3.5.9. Otherwise, the file name is relative to
1869          * the share that is identified by the TreeId in the SMB2
1870          * header.
1871          */
1872         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1873                 int name_len;
1874
1875                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1876                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1877                                                  &name_len,
1878                                                  tcon->treeName, path);
1879                 if (rc) {
1880                         cifs_small_buf_release(req);
1881                         return rc;
1882                 }
1883                 req->NameLength = cpu_to_le16(name_len * 2);
1884                 uni_path_len = copy_size;
1885                 path = copy_path;
1886         } else {
1887                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1888                 /* MUST set path len (NameLength) to 0 opening root of share */
1889                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1890                 if (uni_path_len % 8 != 0) {
1891                         copy_size = roundup(uni_path_len, 8);
1892                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1893                         if (!copy_path) {
1894                                 cifs_small_buf_release(req);
1895                                 return -ENOMEM;
1896                         }
1897                         memcpy((char *)copy_path, (const char *)path,
1898                                uni_path_len);
1899                         uni_path_len = copy_size;
1900                         path = copy_path;
1901                 }
1902         }
1903
1904         iov[1].iov_len = uni_path_len;
1905         iov[1].iov_base = path;
1906
1907         if (!server->oplocks)
1908                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1909
1910         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1911             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1912                 req->RequestedOplockLevel = *oplock;
1913         else {
1914                 rc = add_lease_context(server, iov, &n_iov, oplock);
1915                 if (rc) {
1916                         cifs_small_buf_release(req);
1917                         kfree(copy_path);
1918                         return rc;
1919                 }
1920                 lc_buf = iov[n_iov-1].iov_base;
1921         }
1922
1923         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1924                 /* need to set Next field of lease context if we request it */
1925                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1926                         struct create_context *ccontext =
1927                             (struct create_context *)iov[n_iov-1].iov_base;
1928                         ccontext->Next =
1929                                 cpu_to_le32(server->vals->create_lease_size);
1930                 }
1931
1932                 rc = add_durable_context(iov, &n_iov, oparms,
1933                                         tcon->use_persistent);
1934                 if (rc) {
1935                         cifs_small_buf_release(req);
1936                         kfree(copy_path);
1937                         kfree(lc_buf);
1938                         return rc;
1939                 }
1940                 dhc_buf = iov[n_iov-1].iov_base;
1941         }
1942
1943         rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
1944                             &rsp_iov);
1945         cifs_small_buf_release(req);
1946         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1947
1948         if (rc != 0) {
1949                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1950                 if (err_iov && rsp) {
1951                         *err_iov = rsp_iov;
1952                         resp_buftype = CIFS_NO_BUFFER;
1953                         rsp = NULL;
1954                 }
1955                 goto creat_exit;
1956         }
1957
1958         oparms->fid->persistent_fid = rsp->PersistentFileId;
1959         oparms->fid->volatile_fid = rsp->VolatileFileId;
1960
1961         if (buf) {
1962                 memcpy(buf, &rsp->CreationTime, 32);
1963                 buf->AllocationSize = rsp->AllocationSize;
1964                 buf->EndOfFile = rsp->EndofFile;
1965                 buf->Attributes = rsp->FileAttributes;
1966                 buf->NumberOfLinks = cpu_to_le32(1);
1967                 buf->DeletePending = 0;
1968         }
1969
1970         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1971                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1972         else
1973                 *oplock = rsp->OplockLevel;
1974 creat_exit:
1975         kfree(copy_path);
1976         kfree(lc_buf);
1977         kfree(dhc_buf);
1978         free_rsp_buf(resp_buftype, rsp);
1979         return rc;
1980 }
1981
1982 /*
1983  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1984  */
1985 int
1986 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1987            u64 volatile_fid, u32 opcode, bool is_fsctl,
1988            char *in_data, u32 indatalen,
1989            char **out_data, u32 *plen /* returned data len */)
1990 {
1991         struct smb2_ioctl_req *req;
1992         struct smb2_ioctl_rsp *rsp;
1993         struct smb2_sync_hdr *shdr;
1994         struct cifs_ses *ses;
1995         struct kvec iov[2];
1996         struct kvec rsp_iov;
1997         int resp_buftype;
1998         int n_iov;
1999         int rc = 0;
2000         int flags = 0;
2001         unsigned int total_len;
2002
2003         cifs_dbg(FYI, "SMB2 IOCTL\n");
2004
2005         if (out_data != NULL)
2006                 *out_data = NULL;
2007
2008         /* zero out returned data len, in case of error */
2009         if (plen)
2010                 *plen = 0;
2011
2012         if (tcon)
2013                 ses = tcon->ses;
2014         else
2015                 return -EIO;
2016
2017         if (!ses || !(ses->server))
2018                 return -EIO;
2019
2020         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2021         if (rc)
2022                 return rc;
2023
2024         if (encryption_required(tcon))
2025                 flags |= CIFS_TRANSFORM_REQ;
2026
2027         req->CtlCode = cpu_to_le32(opcode);
2028         req->PersistentFileId = persistent_fid;
2029         req->VolatileFileId = volatile_fid;
2030
2031         if (indatalen) {
2032                 req->InputCount = cpu_to_le32(indatalen);
2033                 /* do not set InputOffset if no input data */
2034                 req->InputOffset =
2035                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2036                 iov[1].iov_base = in_data;
2037                 iov[1].iov_len = indatalen;
2038                 n_iov = 2;
2039         } else
2040                 n_iov = 1;
2041
2042         req->OutputOffset = 0;
2043         req->OutputCount = 0; /* MBZ */
2044
2045         /*
2046          * Could increase MaxOutputResponse, but that would require more
2047          * than one credit. Windows typically sets this smaller, but for some
2048          * ioctls it may be useful to allow server to send more. No point
2049          * limiting what the server can send as long as fits in one credit
2050          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2051          * (by default, note that it can be overridden to make max larger)
2052          * in responses (except for read responses which can be bigger.
2053          * We may want to bump this limit up
2054          */
2055         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2056
2057         if (is_fsctl)
2058                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2059         else
2060                 req->Flags = 0;
2061
2062         iov[0].iov_base = (char *)req;
2063
2064         /*
2065          * If no input data, the size of ioctl struct in
2066          * protocol spec still includes a 1 byte data buffer,
2067          * but if input data passed to ioctl, we do not
2068          * want to double count this, so we do not send
2069          * the dummy one byte of data in iovec[0] if sending
2070          * input data (in iovec[1]).
2071          */
2072
2073         if (indatalen) {
2074                 iov[0].iov_len = total_len - 1;
2075         } else
2076                 iov[0].iov_len = total_len;
2077
2078         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2079         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2080                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2081
2082         rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
2083                             &rsp_iov);
2084         cifs_small_buf_release(req);
2085         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2086
2087         if ((rc != 0) && (rc != -EINVAL)) {
2088                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2089                 goto ioctl_exit;
2090         } else if (rc == -EINVAL) {
2091                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2092                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2093                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2094                         goto ioctl_exit;
2095                 }
2096         }
2097
2098         /* check if caller wants to look at return data or just return rc */
2099         if ((plen == NULL) || (out_data == NULL))
2100                 goto ioctl_exit;
2101
2102         *plen = le32_to_cpu(rsp->OutputCount);
2103
2104         /* We check for obvious errors in the output buffer length and offset */
2105         if (*plen == 0)
2106                 goto ioctl_exit; /* server returned no data */
2107         else if (*plen > 0xFF00) {
2108                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2109                 *plen = 0;
2110                 rc = -EIO;
2111                 goto ioctl_exit;
2112         }
2113
2114         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
2115                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2116                         le32_to_cpu(rsp->OutputOffset));
2117                 *plen = 0;
2118                 rc = -EIO;
2119                 goto ioctl_exit;
2120         }
2121
2122         *out_data = kmalloc(*plen, GFP_KERNEL);
2123         if (*out_data == NULL) {
2124                 rc = -ENOMEM;
2125                 goto ioctl_exit;
2126         }
2127
2128         shdr = get_sync_hdr(rsp);
2129         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2130 ioctl_exit:
2131         free_rsp_buf(resp_buftype, rsp);
2132         return rc;
2133 }
2134
2135 /*
2136  *   Individual callers to ioctl worker function follow
2137  */
2138
2139 int
2140 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2141                      u64 persistent_fid, u64 volatile_fid)
2142 {
2143         int rc;
2144         struct  compress_ioctl fsctl_input;
2145         char *ret_data = NULL;
2146
2147         fsctl_input.CompressionState =
2148                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2149
2150         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2151                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2152                         (char *)&fsctl_input /* data input */,
2153                         2 /* in data len */, &ret_data /* out data */, NULL);
2154
2155         cifs_dbg(FYI, "set compression rc %d\n", rc);
2156
2157         return rc;
2158 }
2159
2160 int
2161 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2162            u64 persistent_fid, u64 volatile_fid)
2163 {
2164         struct smb2_close_req *req;
2165         struct smb2_close_rsp *rsp;
2166         struct cifs_ses *ses = tcon->ses;
2167         struct kvec iov[1];
2168         struct kvec rsp_iov;
2169         int resp_buftype;
2170         int rc = 0;
2171         int flags = 0;
2172         unsigned int total_len;
2173
2174         cifs_dbg(FYI, "Close\n");
2175
2176         if (!ses || !(ses->server))
2177                 return -EIO;
2178
2179         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2180         if (rc)
2181                 return rc;
2182
2183         if (encryption_required(tcon))
2184                 flags |= CIFS_TRANSFORM_REQ;
2185
2186         req->PersistentFileId = persistent_fid;
2187         req->VolatileFileId = volatile_fid;
2188
2189         iov[0].iov_base = (char *)req;
2190         iov[0].iov_len = total_len;
2191
2192         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2193         cifs_small_buf_release(req);
2194         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2195
2196         if (rc != 0) {
2197                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2198                 goto close_exit;
2199         }
2200
2201         /* BB FIXME - decode close response, update inode for caching */
2202
2203 close_exit:
2204         free_rsp_buf(resp_buftype, rsp);
2205         return rc;
2206 }
2207
2208 static int
2209 validate_iov(struct TCP_Server_Info *server,
2210              unsigned int offset, unsigned int buffer_length,
2211              struct kvec *iov, unsigned int min_buf_size)
2212 {
2213         unsigned int smb_len = iov->iov_len;
2214         char *end_of_smb = smb_len + server->vals->header_preamble_size + (char *)iov->iov_base;
2215         char *begin_of_buf = server->vals->header_preamble_size + offset + (char *)iov->iov_base;
2216         char *end_of_buf = begin_of_buf + buffer_length;
2217
2218
2219         if (buffer_length < min_buf_size) {
2220                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2221                          buffer_length, min_buf_size);
2222                 return -EINVAL;
2223         }
2224
2225         /* check if beyond RFC1001 maximum length */
2226         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2227                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2228                          buffer_length, smb_len);
2229                 return -EINVAL;
2230         }
2231
2232         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2233                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2234                 return -EINVAL;
2235         }
2236
2237         return 0;
2238 }
2239
2240 /*
2241  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2242  * Caller must free buffer.
2243  */
2244 static int
2245 validate_and_copy_iov(struct TCP_Server_Info *server,
2246                       unsigned int offset, unsigned int buffer_length,
2247                       struct kvec *iov, unsigned int minbufsize,
2248                       char *data)
2249 {
2250         char *begin_of_buf = server->vals->header_preamble_size + offset + (char *)(iov->iov_base);
2251         int rc;
2252
2253         if (!data)
2254                 return -EINVAL;
2255
2256         rc = validate_iov(server, offset, buffer_length, iov, minbufsize);
2257         if (rc)
2258                 return rc;
2259
2260         memcpy(data, begin_of_buf, buffer_length);
2261
2262         return 0;
2263 }
2264
2265 static int
2266 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2267            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2268            u32 additional_info, size_t output_len, size_t min_len, void **data,
2269                 u32 *dlen)
2270 {
2271         struct smb2_query_info_req *req;
2272         struct smb2_query_info_rsp *rsp = NULL;
2273         struct kvec iov[2];
2274         struct kvec rsp_iov;
2275         int rc = 0;
2276         int resp_buftype;
2277         struct cifs_ses *ses = tcon->ses;
2278         int flags = 0;
2279         unsigned int total_len;
2280
2281         cifs_dbg(FYI, "Query Info\n");
2282
2283         if (!ses || !(ses->server))
2284                 return -EIO;
2285
2286         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2287                              &total_len);
2288         if (rc)
2289                 return rc;
2290
2291         if (encryption_required(tcon))
2292                 flags |= CIFS_TRANSFORM_REQ;
2293
2294         req->InfoType = info_type;
2295         req->FileInfoClass = info_class;
2296         req->PersistentFileId = persistent_fid;
2297         req->VolatileFileId = volatile_fid;
2298         req->AdditionalInformation = cpu_to_le32(additional_info);
2299
2300         /*
2301          * We do not use the input buffer (do not send extra byte)
2302          */
2303         req->InputBufferOffset = 0;
2304
2305         req->OutputBufferLength = cpu_to_le32(output_len);
2306
2307         iov[0].iov_base = (char *)req;
2308         /* 1 for Buffer */
2309         iov[0].iov_len = total_len - 1;
2310
2311         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2312         cifs_small_buf_release(req);
2313         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2314
2315         if (rc) {
2316                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2317                 goto qinf_exit;
2318         }
2319
2320         if (dlen) {
2321                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2322                 if (!*data) {
2323                         *data = kmalloc(*dlen, GFP_KERNEL);
2324                         if (!*data) {
2325                                 cifs_dbg(VFS,
2326                                         "Error %d allocating memory for acl\n",
2327                                         rc);
2328                                 *dlen = 0;
2329                                 goto qinf_exit;
2330                         }
2331                 }
2332         }
2333
2334         rc = validate_and_copy_iov(ses->server,
2335                                    le16_to_cpu(rsp->OutputBufferOffset),
2336                                    le32_to_cpu(rsp->OutputBufferLength),
2337                                    &rsp_iov, min_len, *data);
2338
2339 qinf_exit:
2340         free_rsp_buf(resp_buftype, rsp);
2341         return rc;
2342 }
2343
2344 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2345                    u64 persistent_fid, u64 volatile_fid,
2346                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2347 {
2348         return query_info(xid, tcon, persistent_fid, volatile_fid,
2349                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2350                           ea_buf_size,
2351                           sizeof(struct smb2_file_full_ea_info),
2352                           (void **)&data,
2353                           NULL);
2354 }
2355
2356 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2357         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2358 {
2359         return query_info(xid, tcon, persistent_fid, volatile_fid,
2360                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2361                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2362                           sizeof(struct smb2_file_all_info), (void **)&data,
2363                           NULL);
2364 }
2365
2366 int
2367 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2368                 u64 persistent_fid, u64 volatile_fid,
2369                 void **data, u32 *plen)
2370 {
2371         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2372         *plen = 0;
2373
2374         return query_info(xid, tcon, persistent_fid, volatile_fid,
2375                           0, SMB2_O_INFO_SECURITY, additional_info,
2376                           SMB2_MAX_BUFFER_SIZE,
2377                           sizeof(struct smb2_file_all_info), data, plen);
2378 }
2379
2380 int
2381 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2382                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2383 {
2384         return query_info(xid, tcon, persistent_fid, volatile_fid,
2385                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2386                           sizeof(struct smb2_file_internal_info),
2387                           sizeof(struct smb2_file_internal_info),
2388                           (void **)&uniqueid, NULL);
2389 }
2390
2391 /*
2392  * This is a no-op for now. We're not really interested in the reply, but
2393  * rather in the fact that the server sent one and that server->lstrp
2394  * gets updated.
2395  *
2396  * FIXME: maybe we should consider checking that the reply matches request?
2397  */
2398 static void
2399 smb2_echo_callback(struct mid_q_entry *mid)
2400 {
2401         struct TCP_Server_Info *server = mid->callback_data;
2402         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2403         unsigned int credits_received = 1;
2404
2405         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2406                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2407
2408         DeleteMidQEntry(mid);
2409         add_credits(server, credits_received, CIFS_ECHO_OP);
2410 }
2411
2412 void smb2_reconnect_server(struct work_struct *work)
2413 {
2414         struct TCP_Server_Info *server = container_of(work,
2415                                         struct TCP_Server_Info, reconnect.work);
2416         struct cifs_ses *ses;
2417         struct cifs_tcon *tcon, *tcon2;
2418         struct list_head tmp_list;
2419         int tcon_exist = false;
2420         int rc;
2421         int resched = false;
2422
2423
2424         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2425         mutex_lock(&server->reconnect_mutex);
2426
2427         INIT_LIST_HEAD(&tmp_list);
2428         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2429
2430         spin_lock(&cifs_tcp_ses_lock);
2431         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2432                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2433                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2434                                 tcon->tc_count++;
2435                                 list_add_tail(&tcon->rlist, &tmp_list);
2436                                 tcon_exist = true;
2437                         }
2438                 }
2439                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2440                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2441                         tcon_exist = true;
2442                 }
2443         }
2444         /*
2445          * Get the reference to server struct to be sure that the last call of
2446          * cifs_put_tcon() in the loop below won't release the server pointer.
2447          */
2448         if (tcon_exist)
2449                 server->srv_count++;
2450
2451         spin_unlock(&cifs_tcp_ses_lock);
2452
2453         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2454                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2455                 if (!rc)
2456                         cifs_reopen_persistent_handles(tcon);
2457                 else
2458                         resched = true;
2459                 list_del_init(&tcon->rlist);
2460                 cifs_put_tcon(tcon);
2461         }
2462
2463         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2464         if (resched)
2465                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2466         mutex_unlock(&server->reconnect_mutex);
2467
2468         /* now we can safely release srv struct */
2469         if (tcon_exist)
2470                 cifs_put_tcp_session(server, 1);
2471 }
2472
2473 int
2474 SMB2_echo(struct TCP_Server_Info *server)
2475 {
2476         struct smb2_echo_req *req;
2477         int rc = 0;
2478         struct kvec iov[2];
2479         struct smb_rqst rqst = { .rq_iov = iov,
2480                                  .rq_nvec = 2 };
2481         unsigned int total_len;
2482         __be32 rfc1002_marker;
2483
2484         cifs_dbg(FYI, "In echo request\n");
2485
2486         if (server->tcpStatus == CifsNeedNegotiate) {
2487                 /* No need to send echo on newly established connections */
2488                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2489                 return rc;
2490         }
2491
2492         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2493         if (rc)
2494                 return rc;
2495
2496         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2497
2498         iov[0].iov_len = 4;
2499         rfc1002_marker = cpu_to_be32(total_len);
2500         iov[0].iov_base = &rfc1002_marker;
2501         iov[1].iov_len = total_len;
2502         iov[1].iov_base = (char *)req;
2503
2504         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2505                              server, CIFS_ECHO_OP);
2506         if (rc)
2507                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2508
2509         cifs_small_buf_release(req);
2510         return rc;
2511 }
2512
2513 int
2514 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2515            u64 volatile_fid)
2516 {
2517         struct smb2_flush_req *req;
2518         struct cifs_ses *ses = tcon->ses;
2519         struct kvec iov[1];
2520         struct kvec rsp_iov;
2521         int resp_buftype;
2522         int rc = 0;
2523         int flags = 0;
2524         unsigned int total_len;
2525
2526         cifs_dbg(FYI, "Flush\n");
2527
2528         if (!ses || !(ses->server))
2529                 return -EIO;
2530
2531         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2532         if (rc)
2533                 return rc;
2534
2535         if (encryption_required(tcon))
2536                 flags |= CIFS_TRANSFORM_REQ;
2537
2538         req->PersistentFileId = persistent_fid;
2539         req->VolatileFileId = volatile_fid;
2540
2541         iov[0].iov_base = (char *)req;
2542         iov[0].iov_len = total_len;
2543
2544         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2545         cifs_small_buf_release(req);
2546
2547         if (rc != 0)
2548                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2549
2550         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2551         return rc;
2552 }
2553
2554 /*
2555  * To form a chain of read requests, any read requests after the first should
2556  * have the end_of_chain boolean set to true.
2557  */
2558 static int
2559 smb2_new_read_req(void **buf, unsigned int *total_len,
2560         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2561         unsigned int remaining_bytes, int request_type)
2562 {
2563         int rc = -EACCES;
2564         struct smb2_read_plain_req *req = NULL;
2565         struct smb2_sync_hdr *shdr;
2566         struct TCP_Server_Info *server;
2567
2568         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2569                                  total_len);
2570         if (rc)
2571                 return rc;
2572
2573         server = io_parms->tcon->ses->server;
2574         if (server == NULL)
2575                 return -ECONNABORTED;
2576
2577         shdr = &req->sync_hdr;
2578         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2579
2580         req->PersistentFileId = io_parms->persistent_fid;
2581         req->VolatileFileId = io_parms->volatile_fid;
2582         req->ReadChannelInfoOffset = 0; /* reserved */
2583         req->ReadChannelInfoLength = 0; /* reserved */
2584         req->Channel = 0; /* reserved */
2585         req->MinimumCount = 0;
2586         req->Length = cpu_to_le32(io_parms->length);
2587         req->Offset = cpu_to_le64(io_parms->offset);
2588 #ifdef CONFIG_CIFS_SMB_DIRECT
2589         /*
2590          * If we want to do a RDMA write, fill in and append
2591          * smbd_buffer_descriptor_v1 to the end of read request
2592          */
2593         if (server->rdma && rdata &&
2594                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
2595
2596                 struct smbd_buffer_descriptor_v1 *v1;
2597                 bool need_invalidate =
2598                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
2599
2600                 rdata->mr = smbd_register_mr(
2601                                 server->smbd_conn, rdata->pages,
2602                                 rdata->nr_pages, rdata->tailsz,
2603                                 true, need_invalidate);
2604                 if (!rdata->mr)
2605                         return -ENOBUFS;
2606
2607                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2608                 if (need_invalidate)
2609                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2610                 req->ReadChannelInfoOffset =
2611                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2612                 req->ReadChannelInfoLength =
2613                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2614                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2615                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
2616                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
2617                 v1->length = cpu_to_le32(rdata->mr->mr->length);
2618
2619                 *total_len += sizeof(*v1) - 1;
2620         }
2621 #endif
2622         if (request_type & CHAINED_REQUEST) {
2623                 if (!(request_type & END_OF_CHAIN)) {
2624                         /* next 8-byte aligned request */
2625                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2626                         shdr->NextCommand = cpu_to_le32(*total_len);
2627                 } else /* END_OF_CHAIN */
2628                         shdr->NextCommand = 0;
2629                 if (request_type & RELATED_REQUEST) {
2630                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2631                         /*
2632                          * Related requests use info from previous read request
2633                          * in chain.
2634                          */
2635                         shdr->SessionId = 0xFFFFFFFF;
2636                         shdr->TreeId = 0xFFFFFFFF;
2637                         req->PersistentFileId = 0xFFFFFFFF;
2638                         req->VolatileFileId = 0xFFFFFFFF;
2639                 }
2640         }
2641         if (remaining_bytes > io_parms->length)
2642                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2643         else
2644                 req->RemainingBytes = 0;
2645
2646         *buf = req;
2647         return rc;
2648 }
2649
2650 static void
2651 smb2_readv_callback(struct mid_q_entry *mid)
2652 {
2653         struct cifs_readdata *rdata = mid->callback_data;
2654         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2655         struct TCP_Server_Info *server = tcon->ses->server;
2656         struct smb2_sync_hdr *shdr =
2657                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2658         unsigned int credits_received = 1;
2659         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2660                                  .rq_nvec = 2,
2661                                  .rq_pages = rdata->pages,
2662                                  .rq_npages = rdata->nr_pages,
2663                                  .rq_pagesz = rdata->pagesz,
2664                                  .rq_tailsz = rdata->tailsz };
2665
2666         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2667                  __func__, mid->mid, mid->mid_state, rdata->result,
2668                  rdata->bytes);
2669
2670         switch (mid->mid_state) {
2671         case MID_RESPONSE_RECEIVED:
2672                 credits_received = le16_to_cpu(shdr->CreditRequest);
2673                 /* result already set, check signature */
2674                 if (server->sign && !mid->decrypted) {
2675                         int rc;
2676
2677                         rc = smb2_verify_signature(&rqst, server);
2678                         if (rc)
2679                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2680                                          rc);
2681                 }
2682                 /* FIXME: should this be counted toward the initiating task? */
2683                 task_io_account_read(rdata->got_bytes);
2684                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2685                 break;
2686         case MID_REQUEST_SUBMITTED:
2687         case MID_RETRY_NEEDED:
2688                 rdata->result = -EAGAIN;
2689                 if (server->sign && rdata->got_bytes)
2690                         /* reset bytes number since we can not check a sign */
2691                         rdata->got_bytes = 0;
2692                 /* FIXME: should this be counted toward the initiating task? */
2693                 task_io_account_read(rdata->got_bytes);
2694                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2695                 break;
2696         default:
2697                 if (rdata->result != -ENODATA)
2698                         rdata->result = -EIO;
2699         }
2700 #ifdef CONFIG_CIFS_SMB_DIRECT
2701         /*
2702          * If this rdata has a memmory registered, the MR can be freed
2703          * MR needs to be freed as soon as I/O finishes to prevent deadlock
2704          * because they have limited number and are used for future I/Os
2705          */
2706         if (rdata->mr) {
2707                 smbd_deregister_mr(rdata->mr);
2708                 rdata->mr = NULL;
2709         }
2710 #endif
2711         if (rdata->result)
2712                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2713
2714         queue_work(cifsiod_wq, &rdata->work);
2715         DeleteMidQEntry(mid);
2716         add_credits(server, credits_received, 0);
2717 }
2718
2719 /* smb2_async_readv - send an async read, and set up mid to handle result */
2720 int
2721 smb2_async_readv(struct cifs_readdata *rdata)
2722 {
2723         int rc, flags = 0;
2724         char *buf;
2725         struct smb2_sync_hdr *shdr;
2726         struct cifs_io_parms io_parms;
2727         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2728                                  .rq_nvec = 2 };
2729         struct TCP_Server_Info *server;
2730         unsigned int total_len;
2731         __be32 req_len;
2732
2733         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2734                  __func__, rdata->offset, rdata->bytes);
2735
2736         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2737         io_parms.offset = rdata->offset;
2738         io_parms.length = rdata->bytes;
2739         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2740         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2741         io_parms.pid = rdata->pid;
2742
2743         server = io_parms.tcon->ses->server;
2744
2745         rc = smb2_new_read_req(
2746                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
2747         if (rc) {
2748                 if (rc == -EAGAIN && rdata->credits) {
2749                         /* credits was reset by reconnect */
2750                         rdata->credits = 0;
2751                         /* reduce in_flight value since we won't send the req */
2752                         spin_lock(&server->req_lock);
2753                         server->in_flight--;
2754                         spin_unlock(&server->req_lock);
2755                 }
2756                 return rc;
2757         }
2758
2759         if (encryption_required(io_parms.tcon))
2760                 flags |= CIFS_TRANSFORM_REQ;
2761
2762         req_len = cpu_to_be32(total_len);
2763
2764         rdata->iov[0].iov_base = &req_len;
2765         rdata->iov[0].iov_len = sizeof(__be32);
2766         rdata->iov[1].iov_base = buf;
2767         rdata->iov[1].iov_len = total_len;
2768
2769         shdr = (struct smb2_sync_hdr *)buf;
2770
2771         if (rdata->credits) {
2772                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2773                                                 SMB2_MAX_BUFFER_SIZE));
2774                 shdr->CreditRequest = shdr->CreditCharge;
2775                 spin_lock(&server->req_lock);
2776                 server->credits += rdata->credits -
2777                                                 le16_to_cpu(shdr->CreditCharge);
2778                 spin_unlock(&server->req_lock);
2779                 wake_up(&server->request_q);
2780                 flags |= CIFS_HAS_CREDITS;
2781         }
2782
2783         kref_get(&rdata->refcount);
2784         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2785                              cifs_readv_receive, smb2_readv_callback,
2786                              smb3_handle_read_data, rdata, flags);
2787         if (rc) {
2788                 kref_put(&rdata->refcount, cifs_readdata_release);
2789                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2790         }
2791
2792         cifs_small_buf_release(buf);
2793         return rc;
2794 }
2795
2796 int
2797 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2798           unsigned int *nbytes, char **buf, int *buf_type)
2799 {
2800         int resp_buftype, rc = -EACCES;
2801         struct smb2_read_plain_req *req = NULL;
2802         struct smb2_read_rsp *rsp = NULL;
2803         struct smb2_sync_hdr *shdr;
2804         struct kvec iov[1];
2805         struct kvec rsp_iov;
2806         unsigned int total_len;
2807         int flags = CIFS_LOG_ERROR;
2808         struct cifs_ses *ses = io_parms->tcon->ses;
2809
2810         *nbytes = 0;
2811         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
2812         if (rc)
2813                 return rc;
2814
2815         if (encryption_required(io_parms->tcon))
2816                 flags |= CIFS_TRANSFORM_REQ;
2817
2818         iov[0].iov_base = (char *)req;
2819         iov[0].iov_len = total_len;
2820
2821         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2822         cifs_small_buf_release(req);
2823
2824         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2825
2826         if (rc) {
2827                 if (rc != -ENODATA) {
2828                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2829                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
2830                 }
2831                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2832                 return rc == -ENODATA ? 0 : rc;
2833         }
2834
2835         *nbytes = le32_to_cpu(rsp->DataLength);
2836         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2837             (*nbytes > io_parms->length)) {
2838                 cifs_dbg(FYI, "bad length %d for count %d\n",
2839                          *nbytes, io_parms->length);
2840                 rc = -EIO;
2841                 *nbytes = 0;
2842         }
2843
2844         shdr = get_sync_hdr(rsp);
2845
2846         if (*buf) {
2847                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2848                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2849         } else if (resp_buftype != CIFS_NO_BUFFER) {
2850                 *buf = rsp_iov.iov_base;
2851                 if (resp_buftype == CIFS_SMALL_BUFFER)
2852                         *buf_type = CIFS_SMALL_BUFFER;
2853                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2854                         *buf_type = CIFS_LARGE_BUFFER;
2855         }
2856         return rc;
2857 }
2858
2859 /*
2860  * Check the mid_state and signature on received buffer (if any), and queue the
2861  * workqueue completion task.
2862  */
2863 static void
2864 smb2_writev_callback(struct mid_q_entry *mid)
2865 {
2866         struct cifs_writedata *wdata = mid->callback_data;
2867         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2868         unsigned int written;
2869         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2870         unsigned int credits_received = 1;
2871
2872         switch (mid->mid_state) {
2873         case MID_RESPONSE_RECEIVED:
2874                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2875                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2876                 if (wdata->result != 0)
2877                         break;
2878
2879                 written = le32_to_cpu(rsp->DataLength);
2880                 /*
2881                  * Mask off high 16 bits when bytes written as returned
2882                  * by the server is greater than bytes requested by the
2883                  * client. OS/2 servers are known to set incorrect
2884                  * CountHigh values.
2885                  */
2886                 if (written > wdata->bytes)
2887                         written &= 0xFFFF;
2888
2889                 if (written < wdata->bytes)
2890                         wdata->result = -ENOSPC;
2891                 else
2892                         wdata->bytes = written;
2893                 break;
2894         case MID_REQUEST_SUBMITTED:
2895         case MID_RETRY_NEEDED:
2896                 wdata->result = -EAGAIN;
2897                 break;
2898         default:
2899                 wdata->result = -EIO;
2900                 break;
2901         }
2902 #ifdef CONFIG_CIFS_SMB_DIRECT
2903         /*
2904          * If this wdata has a memory registered, the MR can be freed
2905          * The number of MRs available is limited, it's important to recover
2906          * used MR as soon as I/O is finished. Hold MR longer in the later
2907          * I/O process can possibly result in I/O deadlock due to lack of MR
2908          * to send request on I/O retry
2909          */
2910         if (wdata->mr) {
2911                 smbd_deregister_mr(wdata->mr);
2912                 wdata->mr = NULL;
2913         }
2914 #endif
2915         if (wdata->result)
2916                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2917
2918         queue_work(cifsiod_wq, &wdata->work);
2919         DeleteMidQEntry(mid);
2920         add_credits(tcon->ses->server, credits_received, 0);
2921 }
2922
2923 /* smb2_async_writev - send an async write, and set up mid to handle result */
2924 int
2925 smb2_async_writev(struct cifs_writedata *wdata,
2926                   void (*release)(struct kref *kref))
2927 {
2928         int rc = -EACCES, flags = 0;
2929         struct smb2_write_req *req = NULL;
2930         struct smb2_sync_hdr *shdr;
2931         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2932         struct TCP_Server_Info *server = tcon->ses->server;
2933         struct kvec iov[2];
2934         struct smb_rqst rqst = { };
2935         unsigned int total_len;
2936         __be32 rfc1002_marker;
2937
2938         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
2939         if (rc) {
2940                 if (rc == -EAGAIN && wdata->credits) {
2941                         /* credits was reset by reconnect */
2942                         wdata->credits = 0;
2943                         /* reduce in_flight value since we won't send the req */
2944                         spin_lock(&server->req_lock);
2945                         server->in_flight--;
2946                         spin_unlock(&server->req_lock);
2947                 }
2948                 goto async_writev_out;
2949         }
2950
2951         if (encryption_required(tcon))
2952                 flags |= CIFS_TRANSFORM_REQ;
2953
2954         shdr = (struct smb2_sync_hdr *)req;
2955         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2956
2957         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2958         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2959         req->WriteChannelInfoOffset = 0;
2960         req->WriteChannelInfoLength = 0;
2961         req->Channel = 0;
2962         req->Offset = cpu_to_le64(wdata->offset);
2963         req->DataOffset = cpu_to_le16(
2964                                 offsetof(struct smb2_write_req, Buffer));
2965         req->RemainingBytes = 0;
2966 #ifdef CONFIG_CIFS_SMB_DIRECT
2967         /*
2968          * If we want to do a server RDMA read, fill in and append
2969          * smbd_buffer_descriptor_v1 to the end of write request
2970          */
2971         if (server->rdma && wdata->bytes >=
2972                 server->smbd_conn->rdma_readwrite_threshold) {
2973
2974                 struct smbd_buffer_descriptor_v1 *v1;
2975                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
2976
2977                 wdata->mr = smbd_register_mr(
2978                                 server->smbd_conn, wdata->pages,
2979                                 wdata->nr_pages, wdata->tailsz,
2980                                 false, need_invalidate);
2981                 if (!wdata->mr) {
2982                         rc = -ENOBUFS;
2983                         goto async_writev_out;
2984                 }
2985                 req->Length = 0;
2986                 req->DataOffset = 0;
2987                 req->RemainingBytes =
2988                         cpu_to_le32((wdata->nr_pages-1)*PAGE_SIZE + wdata->tailsz);
2989                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2990                 if (need_invalidate)
2991                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2992                 req->WriteChannelInfoOffset =
2993                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
2994                 req->WriteChannelInfoLength =
2995                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2996                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2997                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
2998                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
2999                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3000         }
3001 #endif
3002         /* 4 for rfc1002 length field and 1 for Buffer */
3003         iov[0].iov_len = 4;
3004         rfc1002_marker = cpu_to_be32(total_len - 1 + wdata->bytes);
3005         iov[0].iov_base = &rfc1002_marker;
3006         iov[1].iov_len = total_len - 1;
3007         iov[1].iov_base = (char *)req;
3008
3009         rqst.rq_iov = iov;
3010         rqst.rq_nvec = 2;
3011         rqst.rq_pages = wdata->pages;
3012         rqst.rq_npages = wdata->nr_pages;
3013         rqst.rq_pagesz = wdata->pagesz;
3014         rqst.rq_tailsz = wdata->tailsz;
3015 #ifdef CONFIG_CIFS_SMB_DIRECT
3016         if (wdata->mr) {
3017                 iov[1].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3018                 rqst.rq_npages = 0;
3019         }
3020 #endif
3021         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3022                  wdata->offset, wdata->bytes);
3023
3024 #ifdef CONFIG_CIFS_SMB_DIRECT
3025         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3026         if (!wdata->mr)
3027                 req->Length = cpu_to_le32(wdata->bytes);
3028 #else
3029         req->Length = cpu_to_le32(wdata->bytes);
3030 #endif
3031
3032         if (wdata->credits) {
3033                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3034                                                     SMB2_MAX_BUFFER_SIZE));
3035                 shdr->CreditRequest = shdr->CreditCharge;
3036                 spin_lock(&server->req_lock);
3037                 server->credits += wdata->credits -
3038                                                 le16_to_cpu(shdr->CreditCharge);
3039                 spin_unlock(&server->req_lock);
3040                 wake_up(&server->request_q);
3041                 flags |= CIFS_HAS_CREDITS;
3042         }
3043
3044         kref_get(&wdata->refcount);
3045         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3046                              wdata, flags);
3047
3048         if (rc) {
3049                 kref_put(&wdata->refcount, release);
3050                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3051         }
3052
3053 async_writev_out:
3054         cifs_small_buf_release(req);
3055         return rc;
3056 }
3057
3058 /*
3059  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3060  * The length field from io_parms must be at least 1 and indicates a number of
3061  * elements with data to write that begins with position 1 in iov array. All
3062  * data length is specified by count.
3063  */
3064 int
3065 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3066            unsigned int *nbytes, struct kvec *iov, int n_vec)
3067 {
3068         int rc = 0;
3069         struct smb2_write_req *req = NULL;
3070         struct smb2_write_rsp *rsp = NULL;
3071         int resp_buftype;
3072         struct kvec rsp_iov;
3073         int flags = 0;
3074         unsigned int total_len;
3075
3076         *nbytes = 0;
3077
3078         if (n_vec < 1)
3079                 return rc;
3080
3081         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3082                              &total_len);
3083         if (rc)
3084                 return rc;
3085
3086         if (io_parms->tcon->ses->server == NULL)
3087                 return -ECONNABORTED;
3088
3089         if (encryption_required(io_parms->tcon))
3090                 flags |= CIFS_TRANSFORM_REQ;
3091
3092         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3093
3094         req->PersistentFileId = io_parms->persistent_fid;
3095         req->VolatileFileId = io_parms->volatile_fid;
3096         req->WriteChannelInfoOffset = 0;
3097         req->WriteChannelInfoLength = 0;
3098         req->Channel = 0;
3099         req->Length = cpu_to_le32(io_parms->length);
3100         req->Offset = cpu_to_le64(io_parms->offset);
3101         req->DataOffset = cpu_to_le16(
3102                                 offsetof(struct smb2_write_req, Buffer));
3103         req->RemainingBytes = 0;
3104
3105         iov[0].iov_base = (char *)req;
3106         /* 1 for Buffer */
3107         iov[0].iov_len = total_len - 1;
3108
3109         rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
3110                             &resp_buftype, flags, &rsp_iov);
3111         cifs_small_buf_release(req);
3112         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3113
3114         if (rc) {
3115                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3116                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3117         } else
3118                 *nbytes = le32_to_cpu(rsp->DataLength);
3119
3120         free_rsp_buf(resp_buftype, rsp);
3121         return rc;
3122 }
3123
3124 static unsigned int
3125 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3126 {
3127         int len;
3128         unsigned int entrycount = 0;
3129         unsigned int next_offset = 0;
3130         FILE_DIRECTORY_INFO *entryptr;
3131
3132         if (bufstart == NULL)
3133                 return 0;
3134
3135         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
3136
3137         while (1) {
3138                 entryptr = (FILE_DIRECTORY_INFO *)
3139                                         ((char *)entryptr + next_offset);
3140
3141                 if ((char *)entryptr + size > end_of_buf) {
3142                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3143                         break;
3144                 }
3145
3146                 len = le32_to_cpu(entryptr->FileNameLength);
3147                 if ((char *)entryptr + len + size > end_of_buf) {
3148                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3149                                  end_of_buf);
3150                         break;
3151                 }
3152
3153                 *lastentry = (char *)entryptr;
3154                 entrycount++;
3155
3156                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3157                 if (!next_offset)
3158                         break;
3159         }
3160
3161         return entrycount;
3162 }
3163
3164 /*
3165  * Readdir/FindFirst
3166  */
3167 int
3168 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3169                      u64 persistent_fid, u64 volatile_fid, int index,
3170                      struct cifs_search_info *srch_inf)
3171 {
3172         struct smb2_query_directory_req *req;
3173         struct smb2_query_directory_rsp *rsp = NULL;
3174         struct kvec iov[2];
3175         struct kvec rsp_iov;
3176         int rc = 0;
3177         int len;
3178         int resp_buftype = CIFS_NO_BUFFER;
3179         unsigned char *bufptr;
3180         struct TCP_Server_Info *server;
3181         struct cifs_ses *ses = tcon->ses;
3182         __le16 asteriks = cpu_to_le16('*');
3183         char *end_of_smb;
3184         unsigned int output_size = CIFSMaxBufSize;
3185         size_t info_buf_size;
3186         int flags = 0;
3187         unsigned int total_len;
3188
3189         if (ses && (ses->server))
3190                 server = ses->server;
3191         else
3192                 return -EIO;
3193
3194         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3195                              &total_len);
3196         if (rc)
3197                 return rc;
3198
3199         if (encryption_required(tcon))
3200                 flags |= CIFS_TRANSFORM_REQ;
3201
3202         switch (srch_inf->info_level) {
3203         case SMB_FIND_FILE_DIRECTORY_INFO:
3204                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3205                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3206                 break;
3207         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3208                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3209                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3210                 break;
3211         default:
3212                 cifs_dbg(VFS, "info level %u isn't supported\n",
3213                          srch_inf->info_level);
3214                 rc = -EINVAL;
3215                 goto qdir_exit;
3216         }
3217
3218         req->FileIndex = cpu_to_le32(index);
3219         req->PersistentFileId = persistent_fid;
3220         req->VolatileFileId = volatile_fid;
3221
3222         len = 0x2;
3223         bufptr = req->Buffer;
3224         memcpy(bufptr, &asteriks, len);
3225
3226         req->FileNameOffset =
3227                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3228         req->FileNameLength = cpu_to_le16(len);
3229         /*
3230          * BB could be 30 bytes or so longer if we used SMB2 specific
3231          * buffer lengths, but this is safe and close enough.
3232          */
3233         output_size = min_t(unsigned int, output_size, server->maxBuf);
3234         output_size = min_t(unsigned int, output_size, 2 << 15);
3235         req->OutputBufferLength = cpu_to_le32(output_size);
3236
3237         iov[0].iov_base = (char *)req;
3238         /* 1 for Buffer */
3239         iov[0].iov_len = total_len - 1;
3240
3241         iov[1].iov_base = (char *)(req->Buffer);
3242         iov[1].iov_len = len;
3243
3244         rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3245         cifs_small_buf_release(req);
3246         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3247
3248         if (rc) {
3249                 if (rc == -ENODATA &&
3250                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3251                         srch_inf->endOfSearch = true;
3252                         rc = 0;
3253                 }
3254                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3255                 goto qdir_exit;
3256         }
3257
3258         rc = validate_iov(server,
3259                           le16_to_cpu(rsp->OutputBufferOffset),
3260                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3261                           info_buf_size);
3262         if (rc)
3263                 goto qdir_exit;
3264
3265         srch_inf->unicode = true;
3266
3267         if (srch_inf->ntwrk_buf_start) {
3268                 if (srch_inf->smallBuf)
3269                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3270                 else
3271                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3272         }
3273         srch_inf->ntwrk_buf_start = (char *)rsp;
3274         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
3275                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
3276         /* 4 for rfc1002 length field */
3277         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
3278         srch_inf->entries_in_buffer =
3279                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3280                                     &srch_inf->last_entry, info_buf_size);
3281         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3282         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3283                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3284                  srch_inf->srch_entries_start, srch_inf->last_entry);
3285         if (resp_buftype == CIFS_LARGE_BUFFER)
3286                 srch_inf->smallBuf = false;
3287         else if (resp_buftype == CIFS_SMALL_BUFFER)
3288                 srch_inf->smallBuf = true;
3289         else
3290                 cifs_dbg(VFS, "illegal search buffer type\n");
3291
3292         return rc;
3293
3294 qdir_exit:
3295         free_rsp_buf(resp_buftype, rsp);
3296         return rc;
3297 }
3298
3299 static int
3300 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3301                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3302                u8 info_type, u32 additional_info, unsigned int num,
3303                 void **data, unsigned int *size)
3304 {
3305         struct smb2_set_info_req *req;
3306         struct smb2_set_info_rsp *rsp = NULL;
3307         struct kvec *iov;
3308         struct kvec rsp_iov;
3309         int rc = 0;
3310         int resp_buftype;
3311         unsigned int i;
3312         struct cifs_ses *ses = tcon->ses;
3313         int flags = 0;
3314         unsigned int total_len;
3315
3316         if (!ses || !(ses->server))
3317                 return -EIO;
3318
3319         if (!num)
3320                 return -EINVAL;
3321
3322         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3323         if (!iov)
3324                 return -ENOMEM;
3325
3326         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3327         if (rc) {
3328                 kfree(iov);
3329                 return rc;
3330         }
3331
3332         if (encryption_required(tcon))
3333                 flags |= CIFS_TRANSFORM_REQ;
3334
3335         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3336
3337         req->InfoType = info_type;
3338         req->FileInfoClass = info_class;
3339         req->PersistentFileId = persistent_fid;
3340         req->VolatileFileId = volatile_fid;
3341         req->AdditionalInformation = cpu_to_le32(additional_info);
3342
3343         req->BufferOffset =
3344                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3345         req->BufferLength = cpu_to_le32(*size);
3346
3347         memcpy(req->Buffer, *data, *size);
3348         total_len += *size;
3349
3350         iov[0].iov_base = (char *)req;
3351         /* 1 for Buffer */
3352         iov[0].iov_len = total_len - 1;
3353
3354         for (i = 1; i < num; i++) {
3355                 le32_add_cpu(&req->BufferLength, size[i]);
3356                 iov[i].iov_base = (char *)data[i];
3357                 iov[i].iov_len = size[i];
3358         }
3359
3360         rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags,
3361                             &rsp_iov);
3362         cifs_small_buf_release(req);
3363         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3364
3365         if (rc != 0)
3366                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3367
3368         free_rsp_buf(resp_buftype, rsp);
3369         kfree(iov);
3370         return rc;
3371 }
3372
3373 int
3374 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3375             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3376 {
3377         struct smb2_file_rename_info info;
3378         void **data;
3379         unsigned int size[2];
3380         int rc;
3381         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3382
3383         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3384         if (!data)
3385                 return -ENOMEM;
3386
3387         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3388                               /* 0 = fail if target already exists */
3389         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3390         info.FileNameLength = cpu_to_le32(len);
3391
3392         data[0] = &info;
3393         size[0] = sizeof(struct smb2_file_rename_info);
3394
3395         data[1] = target_file;
3396         size[1] = len + 2 /* null */;
3397
3398         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3399                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3400                 0, 2, data, size);
3401         kfree(data);
3402         return rc;
3403 }
3404
3405 int
3406 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3407                   u64 persistent_fid, u64 volatile_fid)
3408 {
3409         __u8 delete_pending = 1;
3410         void *data;
3411         unsigned int size;
3412
3413         data = &delete_pending;
3414         size = 1; /* sizeof __u8 */
3415
3416         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3417                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3418                 0, 1, &data, &size);
3419 }
3420
3421 int
3422 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3423                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3424 {
3425         struct smb2_file_link_info info;
3426         void **data;
3427         unsigned int size[2];
3428         int rc;
3429         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3430
3431         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3432         if (!data)
3433                 return -ENOMEM;
3434
3435         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3436                               /* 0 = fail if link already exists */
3437         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3438         info.FileNameLength = cpu_to_le32(len);
3439
3440         data[0] = &info;
3441         size[0] = sizeof(struct smb2_file_link_info);
3442
3443         data[1] = target_file;
3444         size[1] = len + 2 /* null */;
3445
3446         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3447                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3448                         0, 2, data, size);
3449         kfree(data);
3450         return rc;
3451 }
3452
3453 int
3454 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3455              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3456 {
3457         struct smb2_file_eof_info info;
3458         void *data;
3459         unsigned int size;
3460
3461         info.EndOfFile = *eof;
3462
3463         data = &info;
3464         size = sizeof(struct smb2_file_eof_info);
3465
3466         if (is_falloc)
3467                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3468                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3469                         0, 1, &data, &size);
3470         else
3471                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3472                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3473                         0, 1, &data, &size);
3474 }
3475
3476 int
3477 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3478               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3479 {
3480         unsigned int size;
3481         size = sizeof(FILE_BASIC_INFO);
3482         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3483                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3484                 0, 1, (void **)&buf, &size);
3485 }
3486
3487 int
3488 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3489                 u64 persistent_fid, u64 volatile_fid,
3490                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3491 {
3492         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3493                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3494                         1, (void **)&pnntsd, &pacllen);
3495 }
3496
3497 int
3498 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3499             u64 persistent_fid, u64 volatile_fid,
3500             struct smb2_file_full_ea_info *buf, int len)
3501 {
3502         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3503                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3504                 0, 1, (void **)&buf, &len);
3505 }
3506
3507 int
3508 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3509                   const u64 persistent_fid, const u64 volatile_fid,
3510                   __u8 oplock_level)
3511 {
3512         int rc;
3513         struct smb2_oplock_break_req *req = NULL;
3514         struct cifs_ses *ses = tcon->ses;
3515         int flags = CIFS_OBREAK_OP;
3516         unsigned int total_len;
3517         struct kvec iov[1];
3518         struct kvec rsp_iov;
3519         int resp_buf_type;
3520
3521         cifs_dbg(FYI, "SMB2_oplock_break\n");
3522         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3523                              &total_len);
3524         if (rc)
3525                 return rc;
3526
3527         if (encryption_required(tcon))
3528                 flags |= CIFS_TRANSFORM_REQ;
3529
3530         req->VolatileFid = volatile_fid;
3531         req->PersistentFid = persistent_fid;
3532         req->OplockLevel = oplock_level;
3533         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3534
3535         flags |= CIFS_NO_RESP;
3536
3537         iov[0].iov_base = (char *)req;
3538         iov[0].iov_len = total_len;
3539
3540         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3541         cifs_small_buf_release(req);
3542
3543         if (rc) {
3544                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3545                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3546         }
3547
3548         return rc;
3549 }
3550
3551 static void
3552 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3553                         struct kstatfs *kst)
3554 {
3555         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3556                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3557         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3558         kst->f_bfree  = kst->f_bavail =
3559                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3560         return;
3561 }
3562
3563 static int
3564 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3565                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3566 {
3567         struct TCP_Server_Info *server;
3568         int rc;
3569         struct smb2_query_info_req *req;
3570         unsigned int total_len;
3571
3572         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3573
3574         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3575                 return -EIO;
3576
3577         server = tcon->ses->server;
3578
3579         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3580                              &total_len);
3581         if (rc)
3582                 return rc;
3583
3584         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3585         req->FileInfoClass = level;
3586         req->PersistentFileId = persistent_fid;
3587         req->VolatileFileId = volatile_fid;
3588         /* 1 for pad */
3589         req->InputBufferOffset =
3590                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3591         req->OutputBufferLength = cpu_to_le32(
3592                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - server->vals->header_preamble_size);
3593
3594         iov->iov_base = (char *)req;
3595         iov->iov_len = total_len;
3596         return 0;
3597 }
3598
3599 int
3600 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3601               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3602 {
3603         struct smb2_query_info_rsp *rsp = NULL;
3604         struct kvec iov;
3605         struct kvec rsp_iov;
3606         int rc = 0;
3607         int resp_buftype;
3608         struct cifs_ses *ses = tcon->ses;
3609         struct TCP_Server_Info *server = ses->server;
3610         struct smb2_fs_full_size_info *info = NULL;
3611         int flags = 0;
3612
3613         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3614                                 sizeof(struct smb2_fs_full_size_info),
3615                                 persistent_fid, volatile_fid);
3616         if (rc)
3617                 return rc;
3618
3619         if (encryption_required(tcon))
3620                 flags |= CIFS_TRANSFORM_REQ;
3621
3622         rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3623         cifs_small_buf_release(iov.iov_base);
3624         if (rc) {
3625                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3626                 goto qfsinf_exit;
3627         }
3628         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3629
3630         info = (struct smb2_fs_full_size_info *)(server->vals->header_preamble_size +
3631                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3632         rc = validate_iov(server,
3633                           le16_to_cpu(rsp->OutputBufferOffset),
3634                           le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3635                           sizeof(struct smb2_fs_full_size_info));
3636         if (!rc)
3637                 copy_fs_info_to_kstatfs(info, fsdata);
3638
3639 qfsinf_exit:
3640         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3641         return rc;
3642 }
3643
3644 int
3645 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3646               u64 persistent_fid, u64 volatile_fid, int level)
3647 {
3648         struct smb2_query_info_rsp *rsp = NULL;
3649         struct kvec iov;
3650         struct kvec rsp_iov;
3651         int rc = 0;
3652         int resp_buftype, max_len, min_len;
3653         struct cifs_ses *ses = tcon->ses;
3654         struct TCP_Server_Info *server = ses->server;
3655         unsigned int rsp_len, offset;
3656         int flags = 0;
3657
3658         if (level == FS_DEVICE_INFORMATION) {
3659                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3660                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3661         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3662                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3663                 min_len = MIN_FS_ATTR_INFO_SIZE;
3664         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3665                 max_len = sizeof(struct smb3_fs_ss_info);
3666                 min_len = sizeof(struct smb3_fs_ss_info);
3667         } else {
3668                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3669                 return -EINVAL;
3670         }
3671
3672         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3673                                 persistent_fid, volatile_fid);
3674         if (rc)
3675                 return rc;
3676
3677         if (encryption_required(tcon))
3678                 flags |= CIFS_TRANSFORM_REQ;
3679
3680         rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3681         cifs_small_buf_release(iov.iov_base);
3682         if (rc) {
3683                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3684                 goto qfsattr_exit;
3685         }
3686         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3687
3688         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3689         offset = le16_to_cpu(rsp->OutputBufferOffset);
3690         rc = validate_iov(server, offset, rsp_len, &rsp_iov, min_len);
3691         if (rc)
3692                 goto qfsattr_exit;
3693
3694         if (level == FS_ATTRIBUTE_INFORMATION)
3695                 memcpy(&tcon->fsAttrInfo, server->vals->header_preamble_size + offset
3696                         + (char *)&rsp->hdr, min_t(unsigned int,
3697                         rsp_len, max_len));
3698         else if (level == FS_DEVICE_INFORMATION)
3699                 memcpy(&tcon->fsDevInfo, server->vals->header_preamble_size + offset
3700                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3701         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3702                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3703                         (server->vals->header_preamble_size + offset + (char *)&rsp->hdr);
3704                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3705                 tcon->perf_sector_size =
3706                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3707         }
3708
3709 qfsattr_exit:
3710         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3711         return rc;
3712 }
3713
3714 int
3715 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3716            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3717            const __u32 num_lock, struct smb2_lock_element *buf)
3718 {
3719         int rc = 0;
3720         struct smb2_lock_req *req = NULL;
3721         struct kvec iov[2];
3722         struct kvec rsp_iov;
3723         int resp_buf_type;
3724         unsigned int count;
3725         int flags = CIFS_NO_RESP;
3726         unsigned int total_len;
3727
3728         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3729
3730         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3731         if (rc)
3732                 return rc;
3733
3734         if (encryption_required(tcon))
3735                 flags |= CIFS_TRANSFORM_REQ;
3736
3737         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3738         req->LockCount = cpu_to_le16(num_lock);
3739
3740         req->PersistentFileId = persist_fid;
3741         req->VolatileFileId = volatile_fid;
3742
3743         count = num_lock * sizeof(struct smb2_lock_element);
3744
3745         iov[0].iov_base = (char *)req;
3746         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3747         iov[1].iov_base = (char *)buf;
3748         iov[1].iov_len = count;
3749
3750         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3751         rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3752                             &rsp_iov);
3753         cifs_small_buf_release(req);
3754         if (rc) {
3755                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3756                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3757         }
3758
3759         return rc;
3760 }
3761
3762 int
3763 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3764           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3765           const __u64 length, const __u64 offset, const __u32 lock_flags,
3766           const bool wait)
3767 {
3768         struct smb2_lock_element lock;
3769
3770         lock.Offset = cpu_to_le64(offset);
3771         lock.Length = cpu_to_le64(length);
3772         lock.Flags = cpu_to_le32(lock_flags);
3773         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3774                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3775
3776         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3777 }
3778
3779 int
3780 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3781                  __u8 *lease_key, const __le32 lease_state)
3782 {
3783         int rc;
3784         struct smb2_lease_ack *req = NULL;
3785         struct cifs_ses *ses = tcon->ses;
3786         int flags = CIFS_OBREAK_OP;
3787         unsigned int total_len;
3788         struct kvec iov[1];
3789         struct kvec rsp_iov;
3790         int resp_buf_type;
3791
3792         cifs_dbg(FYI, "SMB2_lease_break\n");
3793         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3794                              &total_len);
3795         if (rc)
3796                 return rc;
3797
3798         if (encryption_required(tcon))
3799                 flags |= CIFS_TRANSFORM_REQ;
3800
3801         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3802         req->StructureSize = cpu_to_le16(36);
3803         total_len += 12;
3804
3805         memcpy(req->LeaseKey, lease_key, 16);
3806         req->LeaseState = lease_state;
3807
3808         flags |= CIFS_NO_RESP;
3809
3810         iov[0].iov_base = (char *)req;
3811         iov[0].iov_len = total_len;
3812
3813         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3814         cifs_small_buf_release(req);
3815
3816         if (rc) {
3817                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3818                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3819         }
3820
3821         return rc;
3822 }