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 + 4 + (char *)rsp);
 478                 clen = le16_to_cpu(pctx->DataLength);
 479                 if (clen > len_of_ctxts)
 480                         break;
 481
 482                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 483                         decode_preauth_context(
 484                                 (struct smb2_preauth_neg_context *)pctx);
 485                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 486                         rc = decode_encrypt_ctx(server,
 487                                 (struct smb2_encryption_neg_context *)pctx);
 488                 else
 489                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 490                                 le16_to_cpu(pctx->ContextType));
 491
 492                 if (rc)
 493                         break;
 494                 /* offsets must be 8 byte aligned */
 495                 clen = (clen + 7) & ~0x7;
 496                 offset += clen + sizeof(struct smb2_neg_context);
 497                 len_of_ctxts -= clen;
 498         }
 499         return rc;
 500 }
 501
 502 #else
 503 static void assemble_neg_contexts(struct smb2_negotiate_req *req,
 504                                   unsigned int *total_len)
 505 {
 506         return;
 507 }
 508 #endif /* SMB311 */
 509
 510 /*
 511  *
 512  *      SMB2 Worker functions follow:
 513  *
 514  *      The general structure of the worker functions is:
 515  *      1) Call smb2_init (assembles SMB2 header)
 516  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 517  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 518  *      4) Decode SMB2 command specific fields in the fixed length area
 519  *      5) Decode variable length data area (if any for this SMB2 command type)
 520  *      6) Call free smb buffer
 521  *      7) return
 522  *
 523  */
 524
 525 int
 526 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 527 {
 528         struct smb2_negotiate_req *req;
 529         struct smb2_negotiate_rsp *rsp;
 530         struct kvec iov[1];
 531         struct kvec rsp_iov;
 532         int rc = 0;
 533         int resp_buftype;
 534         struct TCP_Server_Info *server = ses->server;
 535         int blob_offset, blob_length;
 536         char *security_blob;
 537         int flags = CIFS_NEG_OP;
 538         unsigned int total_len;
 539
 540         cifs_dbg(FYI, "Negotiate protocol\n");
 541
 542         if (!server) {
 543                 WARN(1, "%s: server is NULL!\n", __func__);
 544                 return -EIO;
 545         }
 546
 547         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 548         if (rc)
 549                 return rc;
 550
 551         req->sync_hdr.SessionId = 0;
 552 #ifdef CONFIG_CIFS_SMB311
 553         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 554         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 555 #endif
 556
 557         if (strcmp(ses->server->vals->version_string,
 558                    SMB3ANY_VERSION_STRING) == 0) {
 559                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 560                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 561                 req->DialectCount = cpu_to_le16(2);
 562                 total_len += 4;
 563         } else if (strcmp(ses->server->vals->version_string,
 564                    SMBDEFAULT_VERSION_STRING) == 0) {
 565                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 566                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 567                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 568                 req->DialectCount = cpu_to_le16(3);
 569                 total_len += 6;
 570         } else {
 571                 /* otherwise send specific dialect */
 572                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 573                 req->DialectCount = cpu_to_le16(1);
 574                 total_len += 2;
 575         }
 576
 577         /* only one of SMB2 signing flags may be set in SMB2 request */
 578         if (ses->sign)
 579                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 580         else if (global_secflags & CIFSSEC_MAY_SIGN)
 581                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 582         else
 583                 req->SecurityMode = 0;
 584
 585         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 586
 587         /* ClientGUID must be zero for SMB2.02 dialect */
 588         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 589                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 590         else {
 591                 memcpy(req->ClientGUID, server->client_guid,
 592                         SMB2_CLIENT_GUID_SIZE);
 593                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 594                         assemble_neg_contexts(req, &total_len);
 595         }
 596         iov[0].iov_base = (char *)req;
 597         iov[0].iov_len = total_len;
 598
 599         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
 600         cifs_small_buf_release(req);
 601         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 602         /*
 603          * No tcon so can't do
 604          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 605          */
 606         if (rc == -EOPNOTSUPP) {
 607                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 608                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 609                         " older servers\n");
 610                 goto neg_exit;
 611         } else if (rc != 0)
 612                 goto neg_exit;
 613
 614         if (strcmp(ses->server->vals->version_string,
 615                    SMB3ANY_VERSION_STRING) == 0) {
 616                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 617                         cifs_dbg(VFS,
 618                                 "SMB2 dialect returned but not requested\n");
 619                         return -EIO;
 620                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 621                         cifs_dbg(VFS,
 622                                 "SMB2.1 dialect returned but not requested\n");
 623                         return -EIO;
 624                 }
 625         } else if (strcmp(ses->server->vals->version_string,
 626                    SMBDEFAULT_VERSION_STRING) == 0) {
 627                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 628                         cifs_dbg(VFS,
 629                                 "SMB2 dialect returned but not requested\n");
 630                         return -EIO;
 631                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 632                         /* ops set to 3.0 by default for default so update */
 633                         ses->server->ops = &smb21_operations;
 634                 }
 635         } else if (le16_to_cpu(rsp->DialectRevision) !=
 636                                 ses->server->vals->protocol_id) {
 637                 /* if requested single dialect ensure returned dialect matched */
 638                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 639                         le16_to_cpu(rsp->DialectRevision));
 640                 return -EIO;
 641         }
 642
 643         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 644
 645         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 646                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 647         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 648                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 649         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 650                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 651         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 652                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 653 #ifdef CONFIG_CIFS_SMB311
 654         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 655                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 656 #endif /* SMB311 */
 657         else {
 658                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 659                          le16_to_cpu(rsp->DialectRevision));
 660                 rc = -EIO;
 661                 goto neg_exit;
 662         }
 663         server->dialect = le16_to_cpu(rsp->DialectRevision);
 664
 665         /* BB: add check that dialect was valid given dialect(s) we asked for */
 666
 667 #ifdef CONFIG_CIFS_SMB311
 668         /*
 669          * Keep a copy of the hash after negprot. This hash will be
 670          * the starting hash value for all sessions made from this
 671          * server.
 672          */
 673         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 674                SMB2_PREAUTH_HASH_SIZE);
 675 #endif
 676         /* SMB2 only has an extended negflavor */
 677         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 678         /* set it to the maximum buffer size value we can send with 1 credit */
 679         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 680                                SMB2_MAX_BUFFER_SIZE);
 681         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 682         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 683         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 684         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 685                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 686                                 server->sec_mode);
 687         server->capabilities = le32_to_cpu(rsp->Capabilities);
 688         /* Internal types */
 689         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 690
 691         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 692                                                &rsp->hdr);
 693         /*
 694          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 695          * for us will be
 696          *      ses->sectype = RawNTLMSSP;
 697          * but for time being this is our only auth choice so doesn't matter.
 698          * We just found a server which sets blob length to zero expecting raw.
 699          */
 700         if (blob_length == 0) {
 701                 cifs_dbg(FYI, "missing security blob on negprot\n");
 702                 server->sec_ntlmssp = true;
 703         }
 704
 705         rc = cifs_enable_signing(server, ses->sign);
 706         if (rc)
 707                 goto neg_exit;
 708         if (blob_length) {
 709                 rc = decode_negTokenInit(security_blob, blob_length, server);
 710                 if (rc == 1)
 711                         rc = 0;
 712                 else if (rc == 0)
 713                         rc = -EIO;
 714         }
 715
 716 #ifdef CONFIG_CIFS_SMB311
 717         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 718                 if (rsp->NegotiateContextCount)
 719                         rc = smb311_decode_neg_context(rsp, server);
 720                 else
 721                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 722         }
 723 #endif /* CONFIG_CIFS_SMB311 */
 724 neg_exit:
 725         free_rsp_buf(resp_buftype, rsp);
 726         return rc;
 727 }
 728
 729 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 730 {
 731         int rc = 0;
 732         struct validate_negotiate_info_req vneg_inbuf;
 733         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 734         u32 rsplen;
 735         u32 inbuflen; /* max of 4 dialects */
 736
 737         cifs_dbg(FYI, "validate negotiate\n");
 738
 739 #ifdef CONFIG_CIFS_SMB_DIRECT
 740         if (tcon->ses->server->rdma)
 741                 return 0;
 742 #endif
 743
 744         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 745         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 746                 return 0;
 747
 748         /*
 749          * validation ioctl must be signed, so no point sending this if we
 750          * can not sign it (ie are not known user).  Even if signing is not
 751          * required (enabled but not negotiated), in those cases we selectively
 752          * sign just this, the first and only signed request on a connection.
 753          * Having validation of negotiate info  helps reduce attack vectors.
 754          */
 755         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 756                 return 0; /* validation requires signing */
 757
 758         if (tcon->ses->user_name == NULL) {
 759                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 760                 return 0; /* validation requires signing */
 761         }
 762
 763         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 764                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 765
 766         vneg_inbuf.Capabilities =
 767                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 768         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 769                                         SMB2_CLIENT_GUID_SIZE);
 770
 771         if (tcon->ses->sign)
 772                 vneg_inbuf.SecurityMode =
 773                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 774         else if (global_secflags & CIFSSEC_MAY_SIGN)
 775                 vneg_inbuf.SecurityMode =
 776                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 777         else
 778                 vneg_inbuf.SecurityMode = 0;
 779
 780
 781         if (strcmp(tcon->ses->server->vals->version_string,
 782                 SMB3ANY_VERSION_STRING) == 0) {
 783                 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 784                 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 785                 vneg_inbuf.DialectCount = cpu_to_le16(2);
 786                 /* structure is big enough for 3 dialects, sending only 2 */
 787                 inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
 788         } else if (strcmp(tcon->ses->server->vals->version_string,
 789                 SMBDEFAULT_VERSION_STRING) == 0) {
 790                 vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 791                 vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 792                 vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 793                 vneg_inbuf.DialectCount = cpu_to_le16(3);
 794                 /* structure is big enough for 3 dialects */
 795                 inbuflen = sizeof(struct validate_negotiate_info_req);
 796         } else {
 797                 /* otherwise specific dialect was requested */
 798                 vneg_inbuf.Dialects[0] =
 799                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 800                 vneg_inbuf.DialectCount = cpu_to_le16(1);
 801                 /* structure is big enough for 3 dialects, sending only 1 */
 802                 inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
 803         }
 804
 805         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 806                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 807                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 808                 (char **)&pneg_rsp, &rsplen);
 809
 810         if (rc != 0) {
 811                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 812                 return -EIO;
 813         }
 814
 815         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 816                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 817                          rsplen);
 818
 819                 /* relax check since Mac returns max bufsize allowed on ioctl */
 820                 if ((rsplen > CIFSMaxBufSize)
 821                      || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
 822                         goto err_rsp_free;
 823         }
 824
 825         /* check validate negotiate info response matches what we got earlier */
 826         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 827                 goto vneg_out;
 828
 829         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 830                 goto vneg_out;
 831
 832         /* do not validate server guid because not saved at negprot time yet */
 833
 834         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 835               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 836                 goto vneg_out;
 837
 838         /* validate negotiate successful */
 839         cifs_dbg(FYI, "validate negotiate info successful\n");
 840         kfree(pneg_rsp);
 841         return 0;
 842
 843 vneg_out:
 844         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 845 err_rsp_free:
 846         kfree(pneg_rsp);
 847         return -EIO;
 848 }
 849
 850 enum securityEnum
 851 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 852 {
 853         switch (requested) {
 854         case Kerberos:
 855         case RawNTLMSSP:
 856                 return requested;
 857         case NTLMv2:
 858                 return RawNTLMSSP;
 859         case Unspecified:
 860                 if (server->sec_ntlmssp &&
 861                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 862                         return RawNTLMSSP;
 863                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 864                         (global_secflags & CIFSSEC_MAY_KRB5))
 865                         return Kerberos;
 866                 /* Fallthrough */
 867         default:
 868                 return Unspecified;
 869         }
 870 }
 871
 872 struct SMB2_sess_data {
 873         unsigned int xid;
 874         struct cifs_ses *ses;
 875         struct nls_table *nls_cp;
 876         void (*func)(struct SMB2_sess_data *);
 877         int result;
 878         u64 previous_session;
 879
 880         /* we will send the SMB in three pieces:
 881          * a fixed length beginning part, an optional
 882          * SPNEGO blob (which can be zero length), and a
 883          * last part which will include the strings
 884          * and rest of bcc area. This allows us to avoid
 885          * a large buffer 17K allocation
 886          */
 887         int buf0_type;
 888         struct kvec iov[2];
 889 };
 890
 891 static int
 892 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 893 {
 894         int rc;
 895         struct cifs_ses *ses = sess_data->ses;
 896         struct smb2_sess_setup_req *req;
 897         struct TCP_Server_Info *server = ses->server;
 898         unsigned int total_len;
 899
 900         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
 901                              &total_len);
 902         if (rc)
 903                 return rc;
 904
 905         /* First session, not a reauthenticate */
 906         req->sync_hdr.SessionId = 0;
 907
 908         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 909         req->PreviousSessionId = sess_data->previous_session;
 910
 911         req->Flags = 0; /* MBZ */
 912         /* to enable echos and oplocks */
 913         req->sync_hdr.CreditRequest = cpu_to_le16(3);
 914
 915         /* only one of SMB2 signing flags may be set in SMB2 request */
 916         if (server->sign)
 917                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 918         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 919                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 920         else
 921                 req->SecurityMode = 0;
 922
 923         req->Capabilities = 0;
 924         req->Channel = 0; /* MBZ */
 925
 926         sess_data->iov[0].iov_base = (char *)req;
 927         /* 1 for pad */
 928         sess_data->iov[0].iov_len = total_len - 1;
 929         /*
 930          * This variable will be used to clear the buffer
 931          * allocated above in case of any error in the calling function.
 932          */
 933         sess_data->buf0_type = CIFS_SMALL_BUFFER;
 934
 935         return 0;
 936 }
 937
 938 static void
 939 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
 940 {
 941         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
 942         sess_data->buf0_type = CIFS_NO_BUFFER;
 943 }
 944
 945 static int
 946 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
 947 {
 948         int rc;
 949         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
 950         struct kvec rsp_iov = { NULL, 0 };
 951
 952         /* Testing shows that buffer offset must be at location of Buffer[0] */
 953         req->SecurityBufferOffset =
 954                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
 955         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
 956
 957         /* BB add code to build os and lm fields */
 958
 959         rc = smb2_send_recv(sess_data->xid, sess_data->ses,
 960                             sess_data->iov, 2,
 961                             &sess_data->buf0_type,
 962                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
 963         cifs_small_buf_release(sess_data->iov[0].iov_base);
 964         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
 965
 966         return rc;
 967 }
 968
 969 static int
 970 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
 971 {
 972         int rc = 0;
 973         struct cifs_ses *ses = sess_data->ses;
 974
 975         mutex_lock(&ses->server->srv_mutex);
 976         if (ses->server->ops->generate_signingkey) {
 977                 rc = ses->server->ops->generate_signingkey(ses);
 978                 if (rc) {
 979                         cifs_dbg(FYI,
 980                                 "SMB3 session key generation failed\n");
 981                         mutex_unlock(&ses->server->srv_mutex);
 982                         return rc;
 983                 }
 984         }
 985         if (!ses->server->session_estab) {
 986                 ses->server->sequence_number = 0x2;
 987                 ses->server->session_estab = true;
 988         }
 989         mutex_unlock(&ses->server->srv_mutex);
 990
 991         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 992         spin_lock(&GlobalMid_Lock);
 993         ses->status = CifsGood;
 994         ses->need_reconnect = false;
 995         spin_unlock(&GlobalMid_Lock);
 996         return rc;
 997 }
 998
 999 #ifdef CONFIG_CIFS_UPCALL
1000 static void
1001 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1002 {
1003         int rc;
1004         struct cifs_ses *ses = sess_data->ses;
1005         struct cifs_spnego_msg *msg;
1006         struct key *spnego_key = NULL;
1007         struct smb2_sess_setup_rsp *rsp = NULL;
1008
1009         rc = SMB2_sess_alloc_buffer(sess_data);
1010         if (rc)
1011                 goto out;
1012
1013         spnego_key = cifs_get_spnego_key(ses);
1014         if (IS_ERR(spnego_key)) {
1015                 rc = PTR_ERR(spnego_key);
1016                 spnego_key = NULL;
1017                 goto out;
1018         }
1019
1020         msg = spnego_key->payload.data[0];
1021         /*
1022          * check version field to make sure that cifs.upcall is
1023          * sending us a response in an expected form
1024          */
1025         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1026                 cifs_dbg(VFS,
1027                           "bad cifs.upcall version. Expected %d got %d",
1028                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1029                 rc = -EKEYREJECTED;
1030                 goto out_put_spnego_key;
1031         }
1032
1033         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1034                                          GFP_KERNEL);
1035         if (!ses->auth_key.response) {
1036                 cifs_dbg(VFS,
1037                         "Kerberos can't allocate (%u bytes) memory",
1038                         msg->sesskey_len);
1039                 rc = -ENOMEM;
1040                 goto out_put_spnego_key;
1041         }
1042         ses->auth_key.len = msg->sesskey_len;
1043
1044         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1045         sess_data->iov[1].iov_len = msg->secblob_len;
1046
1047         rc = SMB2_sess_sendreceive(sess_data);
1048         if (rc)
1049                 goto out_put_spnego_key;
1050
1051         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1052         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1053
1054         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1055
1056         rc = SMB2_sess_establish_session(sess_data);
1057 out_put_spnego_key:
1058         key_invalidate(spnego_key);
1059         key_put(spnego_key);
1060 out:
1061         sess_data->result = rc;
1062         sess_data->func = NULL;
1063         SMB2_sess_free_buffer(sess_data);
1064 }
1065 #else
1066 static void
1067 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1068 {
1069         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1070         sess_data->result = -EOPNOTSUPP;
1071         sess_data->func = NULL;
1072 }
1073 #endif
1074
1075 static void
1076 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1077
1078 static void
1079 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1080 {
1081         int rc;
1082         struct cifs_ses *ses = sess_data->ses;
1083         struct smb2_sess_setup_rsp *rsp = NULL;
1084         char *ntlmssp_blob = NULL;
1085         bool use_spnego = false; /* else use raw ntlmssp */
1086         u16 blob_length = 0;
1087
1088         /*
1089          * If memory allocation is successful, caller of this function
1090          * frees it.
1091          */
1092         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1093         if (!ses->ntlmssp) {
1094                 rc = -ENOMEM;
1095                 goto out_err;
1096         }
1097         ses->ntlmssp->sesskey_per_smbsess = true;
1098
1099         rc = SMB2_sess_alloc_buffer(sess_data);
1100         if (rc)
1101                 goto out_err;
1102
1103         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1104                                GFP_KERNEL);
1105         if (ntlmssp_blob == NULL) {
1106                 rc = -ENOMEM;
1107                 goto out;
1108         }
1109
1110         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1111         if (use_spnego) {
1112                 /* BB eventually need to add this */
1113                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1114                 rc = -EOPNOTSUPP;
1115                 goto out;
1116         } else {
1117                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1118                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1119         }
1120         sess_data->iov[1].iov_base = ntlmssp_blob;
1121         sess_data->iov[1].iov_len = blob_length;
1122
1123         rc = SMB2_sess_sendreceive(sess_data);
1124         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1125
1126         /* If true, rc here is expected and not an error */
1127         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1128                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1129                 rc = 0;
1130
1131         if (rc)
1132                 goto out;
1133
1134         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
1135                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1136                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1137                         le16_to_cpu(rsp->SecurityBufferOffset));
1138                 rc = -EIO;
1139                 goto out;
1140         }
1141         rc = decode_ntlmssp_challenge(rsp->Buffer,
1142                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1143         if (rc)
1144                 goto out;
1145
1146         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1147
1148
1149         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1150         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1151
1152 out:
1153         kfree(ntlmssp_blob);
1154         SMB2_sess_free_buffer(sess_data);
1155         if (!rc) {
1156                 sess_data->result = 0;
1157                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1158                 return;
1159         }
1160 out_err:
1161         kfree(ses->ntlmssp);
1162         ses->ntlmssp = NULL;
1163         sess_data->result = rc;
1164         sess_data->func = NULL;
1165 }
1166
1167 static void
1168 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1169 {
1170         int rc;
1171         struct cifs_ses *ses = sess_data->ses;
1172         struct smb2_sess_setup_req *req;
1173         struct smb2_sess_setup_rsp *rsp = NULL;
1174         unsigned char *ntlmssp_blob = NULL;
1175         bool use_spnego = false; /* else use raw ntlmssp */
1176         u16 blob_length = 0;
1177
1178         rc = SMB2_sess_alloc_buffer(sess_data);
1179         if (rc)
1180                 goto out;
1181
1182         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1183         req->sync_hdr.SessionId = ses->Suid;
1184
1185         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1186                                         sess_data->nls_cp);
1187         if (rc) {
1188                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1189                 goto out;
1190         }
1191
1192         if (use_spnego) {
1193                 /* BB eventually need to add this */
1194                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1195                 rc = -EOPNOTSUPP;
1196                 goto out;
1197         }
1198         sess_data->iov[1].iov_base = ntlmssp_blob;
1199         sess_data->iov[1].iov_len = blob_length;
1200
1201         rc = SMB2_sess_sendreceive(sess_data);
1202         if (rc)
1203                 goto out;
1204
1205         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1206
1207         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1208         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1209
1210         rc = SMB2_sess_establish_session(sess_data);
1211 out:
1212         kfree(ntlmssp_blob);
1213         SMB2_sess_free_buffer(sess_data);
1214         kfree(ses->ntlmssp);
1215         ses->ntlmssp = NULL;
1216         sess_data->result = rc;
1217         sess_data->func = NULL;
1218 }
1219
1220 static int
1221 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1222 {
1223         int type;
1224
1225         type = smb2_select_sectype(ses->server, ses->sectype);
1226         cifs_dbg(FYI, "sess setup type %d\n", type);
1227         if (type == Unspecified) {
1228                 cifs_dbg(VFS,
1229                         "Unable to select appropriate authentication method!");
1230                 return -EINVAL;
1231         }
1232
1233         switch (type) {
1234         case Kerberos:
1235                 sess_data->func = SMB2_auth_kerberos;
1236                 break;
1237         case RawNTLMSSP:
1238                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1239                 break;
1240         default:
1241                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1242                 return -EOPNOTSUPP;
1243         }
1244
1245         return 0;
1246 }
1247
1248 int
1249 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1250                 const struct nls_table *nls_cp)
1251 {
1252         int rc = 0;
1253         struct TCP_Server_Info *server = ses->server;
1254         struct SMB2_sess_data *sess_data;
1255
1256         cifs_dbg(FYI, "Session Setup\n");
1257
1258         if (!server) {
1259                 WARN(1, "%s: server is NULL!\n", __func__);
1260                 return -EIO;
1261         }
1262
1263         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1264         if (!sess_data)
1265                 return -ENOMEM;
1266
1267         rc = SMB2_select_sec(ses, sess_data);
1268         if (rc)
1269                 goto out;
1270         sess_data->xid = xid;
1271         sess_data->ses = ses;
1272         sess_data->buf0_type = CIFS_NO_BUFFER;
1273         sess_data->nls_cp = (struct nls_table *) nls_cp;
1274
1275 #ifdef CONFIG_CIFS_SMB311
1276         /*
1277          * Initialize the session hash with the server one.
1278          */
1279         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1280                SMB2_PREAUTH_HASH_SIZE);
1281 #endif
1282
1283         while (sess_data->func)
1284                 sess_data->func(sess_data);
1285
1286         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1287                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1288         rc = sess_data->result;
1289 out:
1290         kfree(sess_data);
1291         return rc;
1292 }
1293
1294 int
1295 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1296 {
1297         struct smb2_logoff_req *req; /* response is also trivial struct */
1298         int rc = 0;
1299         struct TCP_Server_Info *server;
1300         int flags = 0;
1301         unsigned int total_len;
1302         struct kvec iov[1];
1303         struct kvec rsp_iov;
1304         int resp_buf_type;
1305
1306         cifs_dbg(FYI, "disconnect session %p\n", ses);
1307
1308         if (ses && (ses->server))
1309                 server = ses->server;
1310         else
1311                 return -EIO;
1312
1313         /* no need to send SMB logoff if uid already closed due to reconnect */
1314         if (ses->need_reconnect)
1315                 goto smb2_session_already_dead;
1316
1317         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1318         if (rc)
1319                 return rc;
1320
1321          /* since no tcon, smb2_init can not do this, so do here */
1322         req->sync_hdr.SessionId = ses->Suid;
1323
1324         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1325                 flags |= CIFS_TRANSFORM_REQ;
1326         else if (server->sign)
1327                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1328
1329         flags |= CIFS_NO_RESP;
1330
1331         iov[0].iov_base = (char *)req;
1332         iov[0].iov_len = total_len;
1333
1334         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1335         cifs_small_buf_release(req);
1336         /*
1337          * No tcon so can't do
1338          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1339          */
1340
1341 smb2_session_already_dead:
1342         return rc;
1343 }
1344
1345 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1346 {
1347         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1348 }
1349
1350 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1351
1352 /* These are similar values to what Windows uses */
1353 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1354 {
1355         tcon->max_chunks = 256;
1356         tcon->max_bytes_chunk = 1048576;
1357         tcon->max_bytes_copy = 16777216;
1358 }
1359
1360 int
1361 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1362           struct cifs_tcon *tcon, const struct nls_table *cp)
1363 {
1364         struct smb2_tree_connect_req *req;
1365         struct smb2_tree_connect_rsp *rsp = NULL;
1366         struct kvec iov[2];
1367         struct kvec rsp_iov = { NULL, 0 };
1368         int rc = 0;
1369         int resp_buftype;
1370         int unc_path_len;
1371         __le16 *unc_path = NULL;
1372         int flags = 0;
1373         unsigned int total_len;
1374
1375         cifs_dbg(FYI, "TCON\n");
1376
1377         if (!(ses->server) || !tree)
1378                 return -EIO;
1379
1380         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1381         if (unc_path == NULL)
1382                 return -ENOMEM;
1383
1384         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1385         unc_path_len *= 2;
1386         if (unc_path_len < 2) {
1387                 kfree(unc_path);
1388                 return -EINVAL;
1389         }
1390
1391         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1392         tcon->tid = 0;
1393
1394         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1395                              &total_len);
1396         if (rc) {
1397                 kfree(unc_path);
1398                 return rc;
1399         }
1400
1401         if (encryption_required(tcon))
1402                 flags |= CIFS_TRANSFORM_REQ;
1403
1404         iov[0].iov_base = (char *)req;
1405         /* 1 for pad */
1406         iov[0].iov_len = total_len - 1;
1407
1408         /* Testing shows that buffer offset must be at location of Buffer[0] */
1409         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1410                         - 1 /* pad */);
1411         req->PathLength = cpu_to_le16(unc_path_len - 2);
1412         iov[1].iov_base = unc_path;
1413         iov[1].iov_len = unc_path_len;
1414
1415         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1416         if ((ses->server->dialect == SMB311_PROT_ID) &&
1417             !encryption_required(tcon))
1418                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1419
1420         rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1421         cifs_small_buf_release(req);
1422         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1423
1424         if (rc != 0) {
1425                 if (tcon) {
1426                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1427                         tcon->need_reconnect = true;
1428                 }
1429                 goto tcon_error_exit;
1430         }
1431
1432         switch (rsp->ShareType) {
1433         case SMB2_SHARE_TYPE_DISK:
1434                 cifs_dbg(FYI, "connection to disk share\n");
1435                 break;
1436         case SMB2_SHARE_TYPE_PIPE:
1437                 tcon->pipe = true;
1438                 cifs_dbg(FYI, "connection to pipe share\n");
1439                 break;
1440         case SMB2_SHARE_TYPE_PRINT:
1441                 tcon->print = true;
1442                 cifs_dbg(FYI, "connection to printer\n");
1443                 break;
1444         default:
1445                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1446                 rc = -EOPNOTSUPP;
1447                 goto tcon_error_exit;
1448         }
1449
1450         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1451         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1452         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1453         tcon->tidStatus = CifsGood;
1454         tcon->need_reconnect = false;
1455         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1456         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1457
1458         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1459             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1460                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1461
1462         if (tcon->seal &&
1463             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1464                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1465
1466         init_copy_chunk_defaults(tcon);
1467         if (tcon->ses->server->ops->validate_negotiate)
1468                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1469 tcon_exit:
1470         free_rsp_buf(resp_buftype, rsp);
1471         kfree(unc_path);
1472         return rc;
1473
1474 tcon_error_exit:
1475         if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1476                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1477         }
1478         goto tcon_exit;
1479 }
1480
1481 int
1482 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1483 {
1484         struct smb2_tree_disconnect_req *req; /* response is trivial */
1485         int rc = 0;
1486         struct cifs_ses *ses = tcon->ses;
1487         int flags = 0;
1488         unsigned int total_len;
1489         struct kvec iov[1];
1490         struct kvec rsp_iov;
1491         int resp_buf_type;
1492
1493         cifs_dbg(FYI, "Tree Disconnect\n");
1494
1495         if (!ses || !(ses->server))
1496                 return -EIO;
1497
1498         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1499                 return 0;
1500
1501         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1502                              &total_len);
1503         if (rc)
1504                 return rc;
1505
1506         if (encryption_required(tcon))
1507                 flags |= CIFS_TRANSFORM_REQ;
1508
1509         flags |= CIFS_NO_RESP;
1510
1511         iov[0].iov_base = (char *)req;
1512         iov[0].iov_len = total_len;
1513
1514         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1515         cifs_small_buf_release(req);
1516         if (rc)
1517                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1518
1519         return rc;
1520 }
1521
1522
1523 static struct create_durable *
1524 create_durable_buf(void)
1525 {
1526         struct create_durable *buf;
1527
1528         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1529         if (!buf)
1530                 return NULL;
1531
1532         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1533                                         (struct create_durable, Data));
1534         buf->ccontext.DataLength = cpu_to_le32(16);
1535         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1536                                 (struct create_durable, Name));
1537         buf->ccontext.NameLength = cpu_to_le16(4);
1538         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1539         buf->Name[0] = 'D';
1540         buf->Name[1] = 'H';
1541         buf->Name[2] = 'n';
1542         buf->Name[3] = 'Q';
1543         return buf;
1544 }
1545
1546 static struct create_durable *
1547 create_reconnect_durable_buf(struct cifs_fid *fid)
1548 {
1549         struct create_durable *buf;
1550
1551         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1552         if (!buf)
1553                 return NULL;
1554
1555         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1556                                         (struct create_durable, Data));
1557         buf->ccontext.DataLength = cpu_to_le32(16);
1558         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1559                                 (struct create_durable, Name));
1560         buf->ccontext.NameLength = cpu_to_le16(4);
1561         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1562         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1563         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1564         buf->Name[0] = 'D';
1565         buf->Name[1] = 'H';
1566         buf->Name[2] = 'n';
1567         buf->Name[3] = 'C';
1568         return buf;
1569 }
1570
1571 static __u8
1572 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1573                   unsigned int *epoch)
1574 {
1575         char *data_offset;
1576         struct create_context *cc;
1577         unsigned int next;
1578         unsigned int remaining;
1579         char *name;
1580
1581         data_offset = (char *)rsp + server->vals->header_preamble_size + le32_to_cpu(rsp->CreateContextsOffset);
1582         remaining = le32_to_cpu(rsp->CreateContextsLength);
1583         cc = (struct create_context *)data_offset;
1584         while (remaining >= sizeof(struct create_context)) {
1585                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1586                 if (le16_to_cpu(cc->NameLength) == 4 &&
1587                     strncmp(name, "RqLs", 4) == 0)
1588                         return server->ops->parse_lease_buf(cc, epoch);
1589
1590                 next = le32_to_cpu(cc->Next);
1591                 if (!next)
1592                         break;
1593                 remaining -= next;
1594                 cc = (struct create_context *)((char *)cc + next);
1595         }
1596
1597         return 0;
1598 }
1599
1600 static int
1601 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1602                   unsigned int *num_iovec, __u8 *oplock)
1603 {
1604         struct smb2_create_req *req = iov[0].iov_base;
1605         unsigned int num = *num_iovec;
1606
1607         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1608         if (iov[num].iov_base == NULL)
1609                 return -ENOMEM;
1610         iov[num].iov_len = server->vals->create_lease_size;
1611         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1612         if (!req->CreateContextsOffset)
1613                 req->CreateContextsOffset = cpu_to_le32(
1614                                 sizeof(struct smb2_create_req) +
1615                                 iov[num - 1].iov_len);
1616         le32_add_cpu(&req->CreateContextsLength,
1617                      server->vals->create_lease_size);
1618         *num_iovec = num + 1;
1619         return 0;
1620 }
1621
1622 static struct create_durable_v2 *
1623 create_durable_v2_buf(struct cifs_fid *pfid)
1624 {
1625         struct create_durable_v2 *buf;
1626
1627         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1628         if (!buf)
1629                 return NULL;
1630
1631         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1632                                         (struct create_durable_v2, dcontext));
1633         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1634         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1635                                 (struct create_durable_v2, Name));
1636         buf->ccontext.NameLength = cpu_to_le16(4);
1637
1638         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1639         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1640         generate_random_uuid(buf->dcontext.CreateGuid);
1641         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1642
1643         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1644         buf->Name[0] = 'D';
1645         buf->Name[1] = 'H';
1646         buf->Name[2] = '2';
1647         buf->Name[3] = 'Q';
1648         return buf;
1649 }
1650
1651 static struct create_durable_handle_reconnect_v2 *
1652 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1653 {
1654         struct create_durable_handle_reconnect_v2 *buf;
1655
1656         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1657                         GFP_KERNEL);
1658         if (!buf)
1659                 return NULL;
1660
1661         buf->ccontext.DataOffset =
1662                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1663                                      dcontext));
1664         buf->ccontext.DataLength =
1665                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1666         buf->ccontext.NameOffset =
1667                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1668                             Name));
1669         buf->ccontext.NameLength = cpu_to_le16(4);
1670
1671         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1672         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1673         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1674         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1675
1676         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1677         buf->Name[0] = 'D';
1678         buf->Name[1] = 'H';
1679         buf->Name[2] = '2';
1680         buf->Name[3] = 'C';
1681         return buf;
1682 }
1683
1684 static int
1685 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1686                     struct cifs_open_parms *oparms)
1687 {
1688         struct smb2_create_req *req = iov[0].iov_base;
1689         unsigned int num = *num_iovec;
1690
1691         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1692         if (iov[num].iov_base == NULL)
1693                 return -ENOMEM;
1694         iov[num].iov_len = sizeof(struct create_durable_v2);
1695         if (!req->CreateContextsOffset)
1696                 req->CreateContextsOffset =
1697                         cpu_to_le32(sizeof(struct smb2_create_req) +
1698                                                                 iov[1].iov_len);
1699         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1700         *num_iovec = num + 1;
1701         return 0;
1702 }
1703
1704 static int
1705 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1706                     struct cifs_open_parms *oparms)
1707 {
1708         struct smb2_create_req *req = iov[0].iov_base;
1709         unsigned int num = *num_iovec;
1710
1711         /* indicate that we don't need to relock the file */
1712         oparms->reconnect = false;
1713
1714         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1715         if (iov[num].iov_base == NULL)
1716                 return -ENOMEM;
1717         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1718         if (!req->CreateContextsOffset)
1719                 req->CreateContextsOffset =
1720                         cpu_to_le32(sizeof(struct smb2_create_req) +
1721                                                                 iov[1].iov_len);
1722         le32_add_cpu(&req->CreateContextsLength,
1723                         sizeof(struct create_durable_handle_reconnect_v2));
1724         *num_iovec = num + 1;
1725         return 0;
1726 }
1727
1728 static int
1729 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1730                     struct cifs_open_parms *oparms, bool use_persistent)
1731 {
1732         struct smb2_create_req *req = iov[0].iov_base;
1733         unsigned int num = *num_iovec;
1734
1735         if (use_persistent) {
1736                 if (oparms->reconnect)
1737                         return add_durable_reconnect_v2_context(iov, num_iovec,
1738                                                                 oparms);
1739                 else
1740                         return add_durable_v2_context(iov, num_iovec, oparms);
1741         }
1742
1743         if (oparms->reconnect) {
1744                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1745                 /* indicate that we don't need to relock the file */
1746                 oparms->reconnect = false;
1747         } else
1748                 iov[num].iov_base = create_durable_buf();
1749         if (iov[num].iov_base == NULL)
1750                 return -ENOMEM;
1751         iov[num].iov_len = sizeof(struct create_durable);
1752         if (!req->CreateContextsOffset)
1753                 req->CreateContextsOffset =
1754                         cpu_to_le32(sizeof(struct smb2_create_req) +
1755                                                                 iov[1].iov_len);
1756         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1757         *num_iovec = num + 1;
1758         return 0;
1759 }
1760
1761 static int
1762 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1763                             const char *treename, const __le16 *path)
1764 {
1765         int treename_len, path_len;
1766         struct nls_table *cp;
1767         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1768
1769         /*
1770          * skip leading "\\"
1771          */
1772         treename_len = strlen(treename);
1773         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1774                 return -EINVAL;
1775
1776         treename += 2;
1777         treename_len -= 2;
1778
1779         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1780
1781         /*
1782          * make room for one path separator between the treename and
1783          * path
1784          */
1785         *out_len = treename_len + 1 + path_len;
1786
1787         /*
1788          * final path needs to be null-terminated UTF16 with a
1789          * size aligned to 8
1790          */
1791
1792         *out_size = roundup((*out_len+1)*2, 8);
1793         *out_path = kzalloc(*out_size, GFP_KERNEL);
1794         if (!*out_path)
1795                 return -ENOMEM;
1796
1797         cp = load_nls_default();
1798         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1799         UniStrcat(*out_path, sep);
1800         UniStrcat(*out_path, path);
1801         unload_nls(cp);
1802
1803         return 0;
1804 }
1805
1806 int
1807 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1808           __u8 *oplock, struct smb2_file_all_info *buf,
1809           struct smb2_err_rsp **err_buf)
1810 {
1811         struct smb2_create_req *req;
1812         struct smb2_create_rsp *rsp;
1813         struct TCP_Server_Info *server;
1814         struct cifs_tcon *tcon = oparms->tcon;
1815         struct cifs_ses *ses = tcon->ses;
1816         struct kvec iov[4];
1817         struct kvec rsp_iov = {NULL, 0};
1818         int resp_buftype;
1819         int uni_path_len;
1820         __le16 *copy_path = NULL;
1821         int copy_size;
1822         int rc = 0;
1823         unsigned int n_iov = 2;
1824         __u32 file_attributes = 0;
1825         char *dhc_buf = NULL, *lc_buf = NULL;
1826         int flags = 0;
1827         unsigned int total_len;
1828
1829         cifs_dbg(FYI, "create/open\n");
1830
1831         if (ses && (ses->server))
1832                 server = ses->server;
1833         else
1834                 return -EIO;
1835
1836         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
1837
1838         if (rc)
1839                 return rc;
1840
1841         if (encryption_required(tcon))
1842                 flags |= CIFS_TRANSFORM_REQ;
1843
1844         if (oparms->create_options & CREATE_OPTION_READONLY)
1845                 file_attributes |= ATTR_READONLY;
1846         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1847                 file_attributes |= ATTR_SYSTEM;
1848
1849         req->ImpersonationLevel = IL_IMPERSONATION;
1850         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1851         /* File attributes ignored on open (used in create though) */
1852         req->FileAttributes = cpu_to_le32(file_attributes);
1853         req->ShareAccess = FILE_SHARE_ALL_LE;
1854         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1855         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1856
1857         iov[0].iov_base = (char *)req;
1858         /* -1 since last byte is buf[0] which is sent below (path) */
1859         iov[0].iov_len = total_len - 1;
1860
1861         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1862
1863         /* [MS-SMB2] 2.2.13 NameOffset:
1864          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1865          * the SMB2 header, the file name includes a prefix that will
1866          * be processed during DFS name normalization as specified in
1867          * section 3.3.5.9. Otherwise, the file name is relative to
1868          * the share that is identified by the TreeId in the SMB2
1869          * header.
1870          */
1871         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1872                 int name_len;
1873
1874                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1875                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1876                                                  &name_len,
1877                                                  tcon->treeName, path);
1878                 if (rc) {
1879                         cifs_small_buf_release(req);
1880                         return rc;
1881                 }
1882                 req->NameLength = cpu_to_le16(name_len * 2);
1883                 uni_path_len = copy_size;
1884                 path = copy_path;
1885         } else {
1886                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1887                 /* MUST set path len (NameLength) to 0 opening root of share */
1888                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1889                 if (uni_path_len % 8 != 0) {
1890                         copy_size = roundup(uni_path_len, 8);
1891                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1892                         if (!copy_path) {
1893                                 cifs_small_buf_release(req);
1894                                 return -ENOMEM;
1895                         }
1896                         memcpy((char *)copy_path, (const char *)path,
1897                                uni_path_len);
1898                         uni_path_len = copy_size;
1899                         path = copy_path;
1900                 }
1901         }
1902
1903         iov[1].iov_len = uni_path_len;
1904         iov[1].iov_base = path;
1905
1906         if (!server->oplocks)
1907                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1908
1909         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1910             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1911                 req->RequestedOplockLevel = *oplock;
1912         else {
1913                 rc = add_lease_context(server, iov, &n_iov, oplock);
1914                 if (rc) {
1915                         cifs_small_buf_release(req);
1916                         kfree(copy_path);
1917                         return rc;
1918                 }
1919                 lc_buf = iov[n_iov-1].iov_base;
1920         }
1921
1922         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1923                 /* need to set Next field of lease context if we request it */
1924                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1925                         struct create_context *ccontext =
1926                             (struct create_context *)iov[n_iov-1].iov_base;
1927                         ccontext->Next =
1928                                 cpu_to_le32(server->vals->create_lease_size);
1929                 }
1930
1931                 rc = add_durable_context(iov, &n_iov, oparms,
1932                                         tcon->use_persistent);
1933                 if (rc) {
1934                         cifs_small_buf_release(req);
1935                         kfree(copy_path);
1936                         kfree(lc_buf);
1937                         return rc;
1938                 }
1939                 dhc_buf = iov[n_iov-1].iov_base;
1940         }
1941
1942         rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
1943                             &rsp_iov);
1944         cifs_small_buf_release(req);
1945         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1946
1947         if (rc != 0) {
1948                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1949                 if (err_buf && rsp)
1950                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1951                                            GFP_KERNEL);
1952                 goto creat_exit;
1953         }
1954
1955         oparms->fid->persistent_fid = rsp->PersistentFileId;
1956         oparms->fid->volatile_fid = rsp->VolatileFileId;
1957
1958         if (buf) {
1959                 memcpy(buf, &rsp->CreationTime, 32);
1960                 buf->AllocationSize = rsp->AllocationSize;
1961                 buf->EndOfFile = rsp->EndofFile;
1962                 buf->Attributes = rsp->FileAttributes;
1963                 buf->NumberOfLinks = cpu_to_le32(1);
1964                 buf->DeletePending = 0;
1965         }
1966
1967         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1968                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1969         else
1970                 *oplock = rsp->OplockLevel;
1971 creat_exit:
1972         kfree(copy_path);
1973         kfree(lc_buf);
1974         kfree(dhc_buf);
1975         free_rsp_buf(resp_buftype, rsp);
1976         return rc;
1977 }
1978
1979 /*
1980  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1981  */
1982 int
1983 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1984            u64 volatile_fid, u32 opcode, bool is_fsctl,
1985            char *in_data, u32 indatalen,
1986            char **out_data, u32 *plen /* returned data len */)
1987 {
1988         struct smb2_ioctl_req *req;
1989         struct smb2_ioctl_rsp *rsp;
1990         struct smb2_sync_hdr *shdr;
1991         struct cifs_ses *ses;
1992         struct kvec iov[2];
1993         struct kvec rsp_iov;
1994         int resp_buftype;
1995         int n_iov;
1996         int rc = 0;
1997         int flags = 0;
1998         unsigned int total_len;
1999
2000         cifs_dbg(FYI, "SMB2 IOCTL\n");
2001
2002         if (out_data != NULL)
2003                 *out_data = NULL;
2004
2005         /* zero out returned data len, in case of error */
2006         if (plen)
2007                 *plen = 0;
2008
2009         if (tcon)
2010                 ses = tcon->ses;
2011         else
2012                 return -EIO;
2013
2014         if (!ses || !(ses->server))
2015                 return -EIO;
2016
2017         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2018         if (rc)
2019                 return rc;
2020
2021         if (encryption_required(tcon))
2022                 flags |= CIFS_TRANSFORM_REQ;
2023
2024         req->CtlCode = cpu_to_le32(opcode);
2025         req->PersistentFileId = persistent_fid;
2026         req->VolatileFileId = volatile_fid;
2027
2028         if (indatalen) {
2029                 req->InputCount = cpu_to_le32(indatalen);
2030                 /* do not set InputOffset if no input data */
2031                 req->InputOffset =
2032                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2033                 iov[1].iov_base = in_data;
2034                 iov[1].iov_len = indatalen;
2035                 n_iov = 2;
2036         } else
2037                 n_iov = 1;
2038
2039         req->OutputOffset = 0;
2040         req->OutputCount = 0; /* MBZ */
2041
2042         /*
2043          * Could increase MaxOutputResponse, but that would require more
2044          * than one credit. Windows typically sets this smaller, but for some
2045          * ioctls it may be useful to allow server to send more. No point
2046          * limiting what the server can send as long as fits in one credit
2047          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2048          * (by default, note that it can be overridden to make max larger)
2049          * in responses (except for read responses which can be bigger.
2050          * We may want to bump this limit up
2051          */
2052         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2053
2054         if (is_fsctl)
2055                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2056         else
2057                 req->Flags = 0;
2058
2059         iov[0].iov_base = (char *)req;
2060
2061         /*
2062          * If no input data, the size of ioctl struct in
2063          * protocol spec still includes a 1 byte data buffer,
2064          * but if input data passed to ioctl, we do not
2065          * want to double count this, so we do not send
2066          * the dummy one byte of data in iovec[0] if sending
2067          * input data (in iovec[1]).
2068          */
2069
2070         if (indatalen) {
2071                 iov[0].iov_len = total_len - 1;
2072         } else
2073                 iov[0].iov_len = total_len;
2074
2075         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2076         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2077                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2078
2079         rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
2080                             &rsp_iov);
2081         cifs_small_buf_release(req);
2082         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2083
2084         if ((rc != 0) && (rc != -EINVAL)) {
2085                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2086                 goto ioctl_exit;
2087         } else if (rc == -EINVAL) {
2088                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2089                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2090                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2091                         goto ioctl_exit;
2092                 }
2093         }
2094
2095         /* check if caller wants to look at return data or just return rc */
2096         if ((plen == NULL) || (out_data == NULL))
2097                 goto ioctl_exit;
2098
2099         *plen = le32_to_cpu(rsp->OutputCount);
2100
2101         /* We check for obvious errors in the output buffer length and offset */
2102         if (*plen == 0)
2103                 goto ioctl_exit; /* server returned no data */
2104         else if (*plen > 0xFF00) {
2105                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2106                 *plen = 0;
2107                 rc = -EIO;
2108                 goto ioctl_exit;
2109         }
2110
2111         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
2112                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2113                         le32_to_cpu(rsp->OutputOffset));
2114                 *plen = 0;
2115                 rc = -EIO;
2116                 goto ioctl_exit;
2117         }
2118
2119         *out_data = kmalloc(*plen, GFP_KERNEL);
2120         if (*out_data == NULL) {
2121                 rc = -ENOMEM;
2122                 goto ioctl_exit;
2123         }
2124
2125         shdr = get_sync_hdr(rsp);
2126         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2127 ioctl_exit:
2128         free_rsp_buf(resp_buftype, rsp);
2129         return rc;
2130 }
2131
2132 /*
2133  *   Individual callers to ioctl worker function follow
2134  */
2135
2136 int
2137 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2138                      u64 persistent_fid, u64 volatile_fid)
2139 {
2140         int rc;
2141         struct  compress_ioctl fsctl_input;
2142         char *ret_data = NULL;
2143
2144         fsctl_input.CompressionState =
2145                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2146
2147         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2148                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2149                         (char *)&fsctl_input /* data input */,
2150                         2 /* in data len */, &ret_data /* out data */, NULL);
2151
2152         cifs_dbg(FYI, "set compression rc %d\n", rc);
2153
2154         return rc;
2155 }
2156
2157 int
2158 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2159            u64 persistent_fid, u64 volatile_fid)
2160 {
2161         struct smb2_close_req *req;
2162         struct smb2_close_rsp *rsp;
2163         struct cifs_ses *ses = tcon->ses;
2164         struct kvec iov[1];
2165         struct kvec rsp_iov;
2166         int resp_buftype;
2167         int rc = 0;
2168         int flags = 0;
2169         unsigned int total_len;
2170
2171         cifs_dbg(FYI, "Close\n");
2172
2173         if (!ses || !(ses->server))
2174                 return -EIO;
2175
2176         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2177         if (rc)
2178                 return rc;
2179
2180         if (encryption_required(tcon))
2181                 flags |= CIFS_TRANSFORM_REQ;
2182
2183         req->PersistentFileId = persistent_fid;
2184         req->VolatileFileId = volatile_fid;
2185
2186         iov[0].iov_base = (char *)req;
2187         iov[0].iov_len = total_len;
2188
2189         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2190         cifs_small_buf_release(req);
2191         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2192
2193         if (rc != 0) {
2194                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2195                 goto close_exit;
2196         }
2197
2198         /* BB FIXME - decode close response, update inode for caching */
2199
2200 close_exit:
2201         free_rsp_buf(resp_buftype, rsp);
2202         return rc;
2203 }
2204
2205 static int
2206 validate_buf(unsigned int offset, unsigned int buffer_length,
2207              struct smb2_hdr *hdr, unsigned int min_buf_size)
2208
2209 {
2210         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2211         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2212         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2213         char *end_of_buf = begin_of_buf + buffer_length;
2214
2215
2216         if (buffer_length < min_buf_size) {
2217                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2218                          buffer_length, min_buf_size);
2219                 return -EINVAL;
2220         }
2221
2222         /* check if beyond RFC1001 maximum length */
2223         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2224                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2225                          buffer_length, smb_len);
2226                 return -EINVAL;
2227         }
2228
2229         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2230                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2231                 return -EINVAL;
2232         }
2233
2234         return 0;
2235 }
2236
2237 /*
2238  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2239  * Caller must free buffer.
2240  */
2241 static int
2242 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2243                       struct smb2_hdr *hdr, unsigned int minbufsize,
2244                       char *data)
2245
2246 {
2247         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2248         int rc;
2249
2250         if (!data)
2251                 return -EINVAL;
2252
2253         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2254         if (rc)
2255                 return rc;
2256
2257         memcpy(data, begin_of_buf, buffer_length);
2258
2259         return 0;
2260 }
2261
2262 static int
2263 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2264            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2265            u32 additional_info, size_t output_len, size_t min_len, void **data,
2266                 u32 *dlen)
2267 {
2268         struct smb2_query_info_req *req;
2269         struct smb2_query_info_rsp *rsp = NULL;
2270         struct kvec iov[2];
2271         struct kvec rsp_iov;
2272         int rc = 0;
2273         int resp_buftype;
2274         struct cifs_ses *ses = tcon->ses;
2275         int flags = 0;
2276         unsigned int total_len;
2277
2278         cifs_dbg(FYI, "Query Info\n");
2279
2280         if (!ses || !(ses->server))
2281                 return -EIO;
2282
2283         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2284                              &total_len);
2285         if (rc)
2286                 return rc;
2287
2288         if (encryption_required(tcon))
2289                 flags |= CIFS_TRANSFORM_REQ;
2290
2291         req->InfoType = info_type;
2292         req->FileInfoClass = info_class;
2293         req->PersistentFileId = persistent_fid;
2294         req->VolatileFileId = volatile_fid;
2295         req->AdditionalInformation = cpu_to_le32(additional_info);
2296
2297         /*
2298          * We do not use the input buffer (do not send extra byte)
2299          */
2300         req->InputBufferOffset = 0;
2301
2302         req->OutputBufferLength = cpu_to_le32(output_len);
2303
2304         iov[0].iov_base = (char *)req;
2305         /* 1 for Buffer */
2306         iov[0].iov_len = total_len - 1;
2307
2308         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2309         cifs_small_buf_release(req);
2310         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2311
2312         if (rc) {
2313                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2314                 goto qinf_exit;
2315         }
2316
2317         if (dlen) {
2318                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2319                 if (!*data) {
2320                         *data = kmalloc(*dlen, GFP_KERNEL);
2321                         if (!*data) {
2322                                 cifs_dbg(VFS,
2323                                         "Error %d allocating memory for acl\n",
2324                                         rc);
2325                                 *dlen = 0;
2326                                 goto qinf_exit;
2327                         }
2328                 }
2329         }
2330
2331         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2332                                    le32_to_cpu(rsp->OutputBufferLength),
2333                                    &rsp->hdr, min_len, *data);
2334
2335 qinf_exit:
2336         free_rsp_buf(resp_buftype, rsp);
2337         return rc;
2338 }
2339
2340 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2341                    u64 persistent_fid, u64 volatile_fid,
2342                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2343 {
2344         return query_info(xid, tcon, persistent_fid, volatile_fid,
2345                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2346                           ea_buf_size,
2347                           sizeof(struct smb2_file_full_ea_info),
2348                           (void **)&data,
2349                           NULL);
2350 }
2351
2352 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2353         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2354 {
2355         return query_info(xid, tcon, persistent_fid, volatile_fid,
2356                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2357                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2358                           sizeof(struct smb2_file_all_info), (void **)&data,
2359                           NULL);
2360 }
2361
2362 int
2363 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2364                 u64 persistent_fid, u64 volatile_fid,
2365                 void **data, u32 *plen)
2366 {
2367         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2368         *plen = 0;
2369
2370         return query_info(xid, tcon, persistent_fid, volatile_fid,
2371                           0, SMB2_O_INFO_SECURITY, additional_info,
2372                           SMB2_MAX_BUFFER_SIZE,
2373                           sizeof(struct smb2_file_all_info), data, plen);
2374 }
2375
2376 int
2377 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2378                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2379 {
2380         return query_info(xid, tcon, persistent_fid, volatile_fid,
2381                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2382                           sizeof(struct smb2_file_internal_info),
2383                           sizeof(struct smb2_file_internal_info),
2384                           (void **)&uniqueid, NULL);
2385 }
2386
2387 /*
2388  * This is a no-op for now. We're not really interested in the reply, but
2389  * rather in the fact that the server sent one and that server->lstrp
2390  * gets updated.
2391  *
2392  * FIXME: maybe we should consider checking that the reply matches request?
2393  */
2394 static void
2395 smb2_echo_callback(struct mid_q_entry *mid)
2396 {
2397         struct TCP_Server_Info *server = mid->callback_data;
2398         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2399         unsigned int credits_received = 1;
2400
2401         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2402                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2403
2404         DeleteMidQEntry(mid);
2405         add_credits(server, credits_received, CIFS_ECHO_OP);
2406 }
2407
2408 void smb2_reconnect_server(struct work_struct *work)
2409 {
2410         struct TCP_Server_Info *server = container_of(work,
2411                                         struct TCP_Server_Info, reconnect.work);
2412         struct cifs_ses *ses;
2413         struct cifs_tcon *tcon, *tcon2;
2414         struct list_head tmp_list;
2415         int tcon_exist = false;
2416         int rc;
2417         int resched = false;
2418
2419
2420         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2421         mutex_lock(&server->reconnect_mutex);
2422
2423         INIT_LIST_HEAD(&tmp_list);
2424         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2425
2426         spin_lock(&cifs_tcp_ses_lock);
2427         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2428                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2429                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2430                                 tcon->tc_count++;
2431                                 list_add_tail(&tcon->rlist, &tmp_list);
2432                                 tcon_exist = true;
2433                         }
2434                 }
2435                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2436                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2437                         tcon_exist = true;
2438                 }
2439         }
2440         /*
2441          * Get the reference to server struct to be sure that the last call of
2442          * cifs_put_tcon() in the loop below won't release the server pointer.
2443          */
2444         if (tcon_exist)
2445                 server->srv_count++;
2446
2447         spin_unlock(&cifs_tcp_ses_lock);
2448
2449         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2450                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2451                 if (!rc)
2452                         cifs_reopen_persistent_handles(tcon);
2453                 else
2454                         resched = true;
2455                 list_del_init(&tcon->rlist);
2456                 cifs_put_tcon(tcon);
2457         }
2458
2459         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2460         if (resched)
2461                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2462         mutex_unlock(&server->reconnect_mutex);
2463
2464         /* now we can safely release srv struct */
2465         if (tcon_exist)
2466                 cifs_put_tcp_session(server, 1);
2467 }
2468
2469 int
2470 SMB2_echo(struct TCP_Server_Info *server)
2471 {
2472         struct smb2_echo_req *req;
2473         int rc = 0;
2474         struct kvec iov[2];
2475         struct smb_rqst rqst = { .rq_iov = iov,
2476                                  .rq_nvec = 2 };
2477         unsigned int total_len;
2478         __be32 rfc1002_marker;
2479
2480         cifs_dbg(FYI, "In echo request\n");
2481
2482         if (server->tcpStatus == CifsNeedNegotiate) {
2483                 /* No need to send echo on newly established connections */
2484                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2485                 return rc;
2486         }
2487
2488         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2489         if (rc)
2490                 return rc;
2491
2492         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2493
2494         iov[0].iov_len = 4;
2495         rfc1002_marker = cpu_to_be32(total_len);
2496         iov[0].iov_base = &rfc1002_marker;
2497         iov[1].iov_len = total_len;
2498         iov[1].iov_base = (char *)req;
2499
2500         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2501                              server, CIFS_ECHO_OP);
2502         if (rc)
2503                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2504
2505         cifs_small_buf_release(req);
2506         return rc;
2507 }
2508
2509 int
2510 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2511            u64 volatile_fid)
2512 {
2513         struct smb2_flush_req *req;
2514         struct cifs_ses *ses = tcon->ses;
2515         struct kvec iov[1];
2516         struct kvec rsp_iov;
2517         int resp_buftype;
2518         int rc = 0;
2519         int flags = 0;
2520         unsigned int total_len;
2521
2522         cifs_dbg(FYI, "Flush\n");
2523
2524         if (!ses || !(ses->server))
2525                 return -EIO;
2526
2527         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2528         if (rc)
2529                 return rc;
2530
2531         if (encryption_required(tcon))
2532                 flags |= CIFS_TRANSFORM_REQ;
2533
2534         req->PersistentFileId = persistent_fid;
2535         req->VolatileFileId = volatile_fid;
2536
2537         iov[0].iov_base = (char *)req;
2538         iov[0].iov_len = total_len;
2539
2540         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2541         cifs_small_buf_release(req);
2542
2543         if (rc != 0)
2544                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2545
2546         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2547         return rc;
2548 }
2549
2550 /*
2551  * To form a chain of read requests, any read requests after the first should
2552  * have the end_of_chain boolean set to true.
2553  */
2554 static int
2555 smb2_new_read_req(void **buf, unsigned int *total_len,
2556         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
2557         unsigned int remaining_bytes, int request_type)
2558 {
2559         int rc = -EACCES;
2560         struct smb2_read_plain_req *req = NULL;
2561         struct smb2_sync_hdr *shdr;
2562         struct TCP_Server_Info *server;
2563
2564         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2565                                  total_len);
2566         if (rc)
2567                 return rc;
2568
2569         server = io_parms->tcon->ses->server;
2570         if (server == NULL)
2571                 return -ECONNABORTED;
2572
2573         shdr = &req->sync_hdr;
2574         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2575
2576         req->PersistentFileId = io_parms->persistent_fid;
2577         req->VolatileFileId = io_parms->volatile_fid;
2578         req->ReadChannelInfoOffset = 0; /* reserved */
2579         req->ReadChannelInfoLength = 0; /* reserved */
2580         req->Channel = 0; /* reserved */
2581         req->MinimumCount = 0;
2582         req->Length = cpu_to_le32(io_parms->length);
2583         req->Offset = cpu_to_le64(io_parms->offset);
2584 #ifdef CONFIG_CIFS_SMB_DIRECT
2585         /*
2586          * If we want to do a RDMA write, fill in and append
2587          * smbd_buffer_descriptor_v1 to the end of read request
2588          */
2589         if (server->rdma && rdata &&
2590                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
2591
2592                 struct smbd_buffer_descriptor_v1 *v1;
2593                 bool need_invalidate =
2594                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
2595
2596                 rdata->mr = smbd_register_mr(
2597                                 server->smbd_conn, rdata->pages,
2598                                 rdata->nr_pages, rdata->tailsz,
2599                                 true, need_invalidate);
2600                 if (!rdata->mr)
2601                         return -ENOBUFS;
2602
2603                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2604                 if (need_invalidate)
2605                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2606                 req->ReadChannelInfoOffset =
2607                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2608                 req->ReadChannelInfoLength =
2609                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2610                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2611                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
2612                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
2613                 v1->length = cpu_to_le32(rdata->mr->mr->length);
2614
2615                 *total_len += sizeof(*v1) - 1;
2616         }
2617 #endif
2618         if (request_type & CHAINED_REQUEST) {
2619                 if (!(request_type & END_OF_CHAIN)) {
2620                         /* next 8-byte aligned request */
2621                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2622                         shdr->NextCommand = cpu_to_le32(*total_len);
2623                 } else /* END_OF_CHAIN */
2624                         shdr->NextCommand = 0;
2625                 if (request_type & RELATED_REQUEST) {
2626                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2627                         /*
2628                          * Related requests use info from previous read request
2629                          * in chain.
2630                          */
2631                         shdr->SessionId = 0xFFFFFFFF;
2632                         shdr->TreeId = 0xFFFFFFFF;
2633                         req->PersistentFileId = 0xFFFFFFFF;
2634                         req->VolatileFileId = 0xFFFFFFFF;
2635                 }
2636         }
2637         if (remaining_bytes > io_parms->length)
2638                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2639         else
2640                 req->RemainingBytes = 0;
2641
2642         *buf = req;
2643         return rc;
2644 }
2645
2646 static void
2647 smb2_readv_callback(struct mid_q_entry *mid)
2648 {
2649         struct cifs_readdata *rdata = mid->callback_data;
2650         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2651         struct TCP_Server_Info *server = tcon->ses->server;
2652         struct smb2_sync_hdr *shdr =
2653                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2654         unsigned int credits_received = 1;
2655         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2656                                  .rq_nvec = 2,
2657                                  .rq_pages = rdata->pages,
2658                                  .rq_npages = rdata->nr_pages,
2659                                  .rq_pagesz = rdata->pagesz,
2660                                  .rq_tailsz = rdata->tailsz };
2661
2662         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2663                  __func__, mid->mid, mid->mid_state, rdata->result,
2664                  rdata->bytes);
2665
2666         switch (mid->mid_state) {
2667         case MID_RESPONSE_RECEIVED:
2668                 credits_received = le16_to_cpu(shdr->CreditRequest);
2669                 /* result already set, check signature */
2670                 if (server->sign && !mid->decrypted) {
2671                         int rc;
2672
2673                         rc = smb2_verify_signature(&rqst, server);
2674                         if (rc)
2675                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2676                                          rc);
2677                 }
2678                 /* FIXME: should this be counted toward the initiating task? */
2679                 task_io_account_read(rdata->got_bytes);
2680                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2681                 break;
2682         case MID_REQUEST_SUBMITTED:
2683         case MID_RETRY_NEEDED:
2684                 rdata->result = -EAGAIN;
2685                 if (server->sign && rdata->got_bytes)
2686                         /* reset bytes number since we can not check a sign */
2687                         rdata->got_bytes = 0;
2688                 /* FIXME: should this be counted toward the initiating task? */
2689                 task_io_account_read(rdata->got_bytes);
2690                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2691                 break;
2692         default:
2693                 if (rdata->result != -ENODATA)
2694                         rdata->result = -EIO;
2695         }
2696 #ifdef CONFIG_CIFS_SMB_DIRECT
2697         /*
2698          * If this rdata has a memmory registered, the MR can be freed
2699          * MR needs to be freed as soon as I/O finishes to prevent deadlock
2700          * because they have limited number and are used for future I/Os
2701          */
2702         if (rdata->mr) {
2703                 smbd_deregister_mr(rdata->mr);
2704                 rdata->mr = NULL;
2705         }
2706 #endif
2707         if (rdata->result)
2708                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2709
2710         queue_work(cifsiod_wq, &rdata->work);
2711         DeleteMidQEntry(mid);
2712         add_credits(server, credits_received, 0);
2713 }
2714
2715 /* smb2_async_readv - send an async read, and set up mid to handle result */
2716 int
2717 smb2_async_readv(struct cifs_readdata *rdata)
2718 {
2719         int rc, flags = 0;
2720         char *buf;
2721         struct smb2_sync_hdr *shdr;
2722         struct cifs_io_parms io_parms;
2723         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2724                                  .rq_nvec = 2 };
2725         struct TCP_Server_Info *server;
2726         unsigned int total_len;
2727         __be32 req_len;
2728
2729         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2730                  __func__, rdata->offset, rdata->bytes);
2731
2732         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2733         io_parms.offset = rdata->offset;
2734         io_parms.length = rdata->bytes;
2735         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2736         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2737         io_parms.pid = rdata->pid;
2738
2739         server = io_parms.tcon->ses->server;
2740
2741         rc = smb2_new_read_req(
2742                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
2743         if (rc) {
2744                 if (rc == -EAGAIN && rdata->credits) {
2745                         /* credits was reset by reconnect */
2746                         rdata->credits = 0;
2747                         /* reduce in_flight value since we won't send the req */
2748                         spin_lock(&server->req_lock);
2749                         server->in_flight--;
2750                         spin_unlock(&server->req_lock);
2751                 }
2752                 return rc;
2753         }
2754
2755         if (encryption_required(io_parms.tcon))
2756                 flags |= CIFS_TRANSFORM_REQ;
2757
2758         req_len = cpu_to_be32(total_len);
2759
2760         rdata->iov[0].iov_base = &req_len;
2761         rdata->iov[0].iov_len = sizeof(__be32);
2762         rdata->iov[1].iov_base = buf;
2763         rdata->iov[1].iov_len = total_len;
2764
2765         shdr = (struct smb2_sync_hdr *)buf;
2766
2767         if (rdata->credits) {
2768                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2769                                                 SMB2_MAX_BUFFER_SIZE));
2770                 shdr->CreditRequest = shdr->CreditCharge;
2771                 spin_lock(&server->req_lock);
2772                 server->credits += rdata->credits -
2773                                                 le16_to_cpu(shdr->CreditCharge);
2774                 spin_unlock(&server->req_lock);
2775                 wake_up(&server->request_q);
2776                 flags |= CIFS_HAS_CREDITS;
2777         }
2778
2779         kref_get(&rdata->refcount);
2780         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2781                              cifs_readv_receive, smb2_readv_callback,
2782                              smb3_handle_read_data, rdata, flags);
2783         if (rc) {
2784                 kref_put(&rdata->refcount, cifs_readdata_release);
2785                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2786         }
2787
2788         cifs_small_buf_release(buf);
2789         return rc;
2790 }
2791
2792 int
2793 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2794           unsigned int *nbytes, char **buf, int *buf_type)
2795 {
2796         int resp_buftype, rc = -EACCES;
2797         struct smb2_read_plain_req *req = NULL;
2798         struct smb2_read_rsp *rsp = NULL;
2799         struct smb2_sync_hdr *shdr;
2800         struct kvec iov[1];
2801         struct kvec rsp_iov;
2802         unsigned int total_len;
2803         int flags = CIFS_LOG_ERROR;
2804         struct cifs_ses *ses = io_parms->tcon->ses;
2805
2806         *nbytes = 0;
2807         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
2808         if (rc)
2809                 return rc;
2810
2811         if (encryption_required(io_parms->tcon))
2812                 flags |= CIFS_TRANSFORM_REQ;
2813
2814         iov[0].iov_base = (char *)req;
2815         iov[0].iov_len = total_len;
2816
2817         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2818         cifs_small_buf_release(req);
2819
2820         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2821
2822         if (rc) {
2823                 if (rc != -ENODATA) {
2824                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2825                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
2826                 }
2827                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2828                 return rc == -ENODATA ? 0 : rc;
2829         }
2830
2831         *nbytes = le32_to_cpu(rsp->DataLength);
2832         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2833             (*nbytes > io_parms->length)) {
2834                 cifs_dbg(FYI, "bad length %d for count %d\n",
2835                          *nbytes, io_parms->length);
2836                 rc = -EIO;
2837                 *nbytes = 0;
2838         }
2839
2840         shdr = get_sync_hdr(rsp);
2841
2842         if (*buf) {
2843                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2844                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2845         } else if (resp_buftype != CIFS_NO_BUFFER) {
2846                 *buf = rsp_iov.iov_base;
2847                 if (resp_buftype == CIFS_SMALL_BUFFER)
2848                         *buf_type = CIFS_SMALL_BUFFER;
2849                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2850                         *buf_type = CIFS_LARGE_BUFFER;
2851         }
2852         return rc;
2853 }
2854
2855 /*
2856  * Check the mid_state and signature on received buffer (if any), and queue the
2857  * workqueue completion task.
2858  */
2859 static void
2860 smb2_writev_callback(struct mid_q_entry *mid)
2861 {
2862         struct cifs_writedata *wdata = mid->callback_data;
2863         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2864         unsigned int written;
2865         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2866         unsigned int credits_received = 1;
2867
2868         switch (mid->mid_state) {
2869         case MID_RESPONSE_RECEIVED:
2870                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2871                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2872                 if (wdata->result != 0)
2873                         break;
2874
2875                 written = le32_to_cpu(rsp->DataLength);
2876                 /*
2877                  * Mask off high 16 bits when bytes written as returned
2878                  * by the server is greater than bytes requested by the
2879                  * client. OS/2 servers are known to set incorrect
2880                  * CountHigh values.
2881                  */
2882                 if (written > wdata->bytes)
2883                         written &= 0xFFFF;
2884
2885                 if (written < wdata->bytes)
2886                         wdata->result = -ENOSPC;
2887                 else
2888                         wdata->bytes = written;
2889                 break;
2890         case MID_REQUEST_SUBMITTED:
2891         case MID_RETRY_NEEDED:
2892                 wdata->result = -EAGAIN;
2893                 break;
2894         default:
2895                 wdata->result = -EIO;
2896                 break;
2897         }
2898 #ifdef CONFIG_CIFS_SMB_DIRECT
2899         /*
2900          * If this wdata has a memory registered, the MR can be freed
2901          * The number of MRs available is limited, it's important to recover
2902          * used MR as soon as I/O is finished. Hold MR longer in the later
2903          * I/O process can possibly result in I/O deadlock due to lack of MR
2904          * to send request on I/O retry
2905          */
2906         if (wdata->mr) {
2907                 smbd_deregister_mr(wdata->mr);
2908                 wdata->mr = NULL;
2909         }
2910 #endif
2911         if (wdata->result)
2912                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2913
2914         queue_work(cifsiod_wq, &wdata->work);
2915         DeleteMidQEntry(mid);
2916         add_credits(tcon->ses->server, credits_received, 0);
2917 }
2918
2919 /* smb2_async_writev - send an async write, and set up mid to handle result */
2920 int
2921 smb2_async_writev(struct cifs_writedata *wdata,
2922                   void (*release)(struct kref *kref))
2923 {
2924         int rc = -EACCES, flags = 0;
2925         struct smb2_write_req *req = NULL;
2926         struct smb2_sync_hdr *shdr;
2927         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2928         struct TCP_Server_Info *server = tcon->ses->server;
2929         struct kvec iov[2];
2930         struct smb_rqst rqst = { };
2931         unsigned int total_len;
2932         __be32 rfc1002_marker;
2933
2934         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
2935         if (rc) {
2936                 if (rc == -EAGAIN && wdata->credits) {
2937                         /* credits was reset by reconnect */
2938                         wdata->credits = 0;
2939                         /* reduce in_flight value since we won't send the req */
2940                         spin_lock(&server->req_lock);
2941                         server->in_flight--;
2942                         spin_unlock(&server->req_lock);
2943                 }
2944                 goto async_writev_out;
2945         }
2946
2947         if (encryption_required(tcon))
2948                 flags |= CIFS_TRANSFORM_REQ;
2949
2950         shdr = (struct smb2_sync_hdr *)req;
2951         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2952
2953         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2954         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2955         req->WriteChannelInfoOffset = 0;
2956         req->WriteChannelInfoLength = 0;
2957         req->Channel = 0;
2958         req->Offset = cpu_to_le64(wdata->offset);
2959         req->DataOffset = cpu_to_le16(
2960                                 offsetof(struct smb2_write_req, Buffer));
2961         req->RemainingBytes = 0;
2962 #ifdef CONFIG_CIFS_SMB_DIRECT
2963         /*
2964          * If we want to do a server RDMA read, fill in and append
2965          * smbd_buffer_descriptor_v1 to the end of write request
2966          */
2967         if (server->rdma && wdata->bytes >=
2968                 server->smbd_conn->rdma_readwrite_threshold) {
2969
2970                 struct smbd_buffer_descriptor_v1 *v1;
2971                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
2972
2973                 wdata->mr = smbd_register_mr(
2974                                 server->smbd_conn, wdata->pages,
2975                                 wdata->nr_pages, wdata->tailsz,
2976                                 false, need_invalidate);
2977                 if (!wdata->mr) {
2978                         rc = -ENOBUFS;
2979                         goto async_writev_out;
2980                 }
2981                 req->Length = 0;
2982                 req->DataOffset = 0;
2983                 req->RemainingBytes =
2984                         cpu_to_le32((wdata->nr_pages-1)*PAGE_SIZE + wdata->tailsz);
2985                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
2986                 if (need_invalidate)
2987                         req->Channel = SMB2_CHANNEL_RDMA_V1;
2988                 req->WriteChannelInfoOffset =
2989                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
2990                 req->WriteChannelInfoLength =
2991                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2992                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2993                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
2994                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
2995                 v1->length = cpu_to_le32(wdata->mr->mr->length);
2996         }
2997 #endif
2998         /* 4 for rfc1002 length field and 1 for Buffer */
2999         iov[0].iov_len = 4;
3000         rfc1002_marker = cpu_to_be32(total_len - 1 + wdata->bytes);
3001         iov[0].iov_base = &rfc1002_marker;
3002         iov[1].iov_len = total_len - 1;
3003         iov[1].iov_base = (char *)req;
3004
3005         rqst.rq_iov = iov;
3006         rqst.rq_nvec = 2;
3007         rqst.rq_pages = wdata->pages;
3008         rqst.rq_npages = wdata->nr_pages;
3009         rqst.rq_pagesz = wdata->pagesz;
3010         rqst.rq_tailsz = wdata->tailsz;
3011 #ifdef CONFIG_CIFS_SMB_DIRECT
3012         if (wdata->mr) {
3013                 iov[1].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3014                 rqst.rq_npages = 0;
3015         }
3016 #endif
3017         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3018                  wdata->offset, wdata->bytes);
3019
3020 #ifdef CONFIG_CIFS_SMB_DIRECT
3021         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3022         if (!wdata->mr)
3023                 req->Length = cpu_to_le32(wdata->bytes);
3024 #else
3025         req->Length = cpu_to_le32(wdata->bytes);
3026 #endif
3027
3028         if (wdata->credits) {
3029                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3030                                                     SMB2_MAX_BUFFER_SIZE));
3031                 shdr->CreditRequest = shdr->CreditCharge;
3032                 spin_lock(&server->req_lock);
3033                 server->credits += wdata->credits -
3034                                                 le16_to_cpu(shdr->CreditCharge);
3035                 spin_unlock(&server->req_lock);
3036                 wake_up(&server->request_q);
3037                 flags |= CIFS_HAS_CREDITS;
3038         }
3039
3040         kref_get(&wdata->refcount);
3041         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3042                              wdata, flags);
3043
3044         if (rc) {
3045                 kref_put(&wdata->refcount, release);
3046                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3047         }
3048
3049 async_writev_out:
3050         cifs_small_buf_release(req);
3051         return rc;
3052 }
3053
3054 /*
3055  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3056  * The length field from io_parms must be at least 1 and indicates a number of
3057  * elements with data to write that begins with position 1 in iov array. All
3058  * data length is specified by count.
3059  */
3060 int
3061 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3062            unsigned int *nbytes, struct kvec *iov, int n_vec)
3063 {
3064         int rc = 0;
3065         struct smb2_write_req *req = NULL;
3066         struct smb2_write_rsp *rsp = NULL;
3067         int resp_buftype;
3068         struct kvec rsp_iov;
3069         int flags = 0;
3070         unsigned int total_len;
3071
3072         *nbytes = 0;
3073
3074         if (n_vec < 1)
3075                 return rc;
3076
3077         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3078                              &total_len);
3079         if (rc)
3080                 return rc;
3081
3082         if (io_parms->tcon->ses->server == NULL)
3083                 return -ECONNABORTED;
3084
3085         if (encryption_required(io_parms->tcon))
3086                 flags |= CIFS_TRANSFORM_REQ;
3087
3088         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3089
3090         req->PersistentFileId = io_parms->persistent_fid;
3091         req->VolatileFileId = io_parms->volatile_fid;
3092         req->WriteChannelInfoOffset = 0;
3093         req->WriteChannelInfoLength = 0;
3094         req->Channel = 0;
3095         req->Length = cpu_to_le32(io_parms->length);
3096         req->Offset = cpu_to_le64(io_parms->offset);
3097         req->DataOffset = cpu_to_le16(
3098                                 offsetof(struct smb2_write_req, Buffer));
3099         req->RemainingBytes = 0;
3100
3101         iov[0].iov_base = (char *)req;
3102         /* 1 for Buffer */
3103         iov[0].iov_len = total_len - 1;
3104
3105         rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
3106                             &resp_buftype, flags, &rsp_iov);
3107         cifs_small_buf_release(req);
3108         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3109
3110         if (rc) {
3111                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3112                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3113         } else
3114                 *nbytes = le32_to_cpu(rsp->DataLength);
3115
3116         free_rsp_buf(resp_buftype, rsp);
3117         return rc;
3118 }
3119
3120 static unsigned int
3121 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3122 {
3123         int len;
3124         unsigned int entrycount = 0;
3125         unsigned int next_offset = 0;
3126         FILE_DIRECTORY_INFO *entryptr;
3127
3128         if (bufstart == NULL)
3129                 return 0;
3130
3131         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
3132
3133         while (1) {
3134                 entryptr = (FILE_DIRECTORY_INFO *)
3135                                         ((char *)entryptr + next_offset);
3136
3137                 if ((char *)entryptr + size > end_of_buf) {
3138                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3139                         break;
3140                 }
3141
3142                 len = le32_to_cpu(entryptr->FileNameLength);
3143                 if ((char *)entryptr + len + size > end_of_buf) {
3144                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3145                                  end_of_buf);
3146                         break;
3147                 }
3148
3149                 *lastentry = (char *)entryptr;
3150                 entrycount++;
3151
3152                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
3153                 if (!next_offset)
3154                         break;
3155         }
3156
3157         return entrycount;
3158 }
3159
3160 /*
3161  * Readdir/FindFirst
3162  */
3163 int
3164 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3165                      u64 persistent_fid, u64 volatile_fid, int index,
3166                      struct cifs_search_info *srch_inf)
3167 {
3168         struct smb2_query_directory_req *req;
3169         struct smb2_query_directory_rsp *rsp = NULL;
3170         struct kvec iov[2];
3171         struct kvec rsp_iov;
3172         int rc = 0;
3173         int len;
3174         int resp_buftype = CIFS_NO_BUFFER;
3175         unsigned char *bufptr;
3176         struct TCP_Server_Info *server;
3177         struct cifs_ses *ses = tcon->ses;
3178         __le16 asteriks = cpu_to_le16('*');
3179         char *end_of_smb;
3180         unsigned int output_size = CIFSMaxBufSize;
3181         size_t info_buf_size;
3182         int flags = 0;
3183         unsigned int total_len;
3184
3185         if (ses && (ses->server))
3186                 server = ses->server;
3187         else
3188                 return -EIO;
3189
3190         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3191                              &total_len);
3192         if (rc)
3193                 return rc;
3194
3195         if (encryption_required(tcon))
3196                 flags |= CIFS_TRANSFORM_REQ;
3197
3198         switch (srch_inf->info_level) {
3199         case SMB_FIND_FILE_DIRECTORY_INFO:
3200                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3201                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3202                 break;
3203         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3204                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3205                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3206                 break;
3207         default:
3208                 cifs_dbg(VFS, "info level %u isn't supported\n",
3209                          srch_inf->info_level);
3210                 rc = -EINVAL;
3211                 goto qdir_exit;
3212         }
3213
3214         req->FileIndex = cpu_to_le32(index);
3215         req->PersistentFileId = persistent_fid;
3216         req->VolatileFileId = volatile_fid;
3217
3218         len = 0x2;
3219         bufptr = req->Buffer;
3220         memcpy(bufptr, &asteriks, len);
3221
3222         req->FileNameOffset =
3223                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3224         req->FileNameLength = cpu_to_le16(len);
3225         /*
3226          * BB could be 30 bytes or so longer if we used SMB2 specific
3227          * buffer lengths, but this is safe and close enough.
3228          */
3229         output_size = min_t(unsigned int, output_size, server->maxBuf);
3230         output_size = min_t(unsigned int, output_size, 2 << 15);
3231         req->OutputBufferLength = cpu_to_le32(output_size);
3232
3233         iov[0].iov_base = (char *)req;
3234         /* 1 for Buffer */
3235         iov[0].iov_len = total_len - 1;
3236
3237         iov[1].iov_base = (char *)(req->Buffer);
3238         iov[1].iov_len = len;
3239
3240         rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3241         cifs_small_buf_release(req);
3242         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3243
3244         if (rc) {
3245                 if (rc == -ENODATA &&
3246                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3247                         srch_inf->endOfSearch = true;
3248                         rc = 0;
3249                 }
3250                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3251                 goto qdir_exit;
3252         }
3253
3254         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3255                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3256                           info_buf_size);
3257         if (rc)
3258                 goto qdir_exit;
3259
3260         srch_inf->unicode = true;
3261
3262         if (srch_inf->ntwrk_buf_start) {
3263                 if (srch_inf->smallBuf)
3264                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3265                 else
3266                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3267         }
3268         srch_inf->ntwrk_buf_start = (char *)rsp;
3269         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
3270                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
3271         /* 4 for rfc1002 length field */
3272         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
3273         srch_inf->entries_in_buffer =
3274                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3275                                     &srch_inf->last_entry, info_buf_size);
3276         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3277         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3278                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3279                  srch_inf->srch_entries_start, srch_inf->last_entry);
3280         if (resp_buftype == CIFS_LARGE_BUFFER)
3281                 srch_inf->smallBuf = false;
3282         else if (resp_buftype == CIFS_SMALL_BUFFER)
3283                 srch_inf->smallBuf = true;
3284         else
3285                 cifs_dbg(VFS, "illegal search buffer type\n");
3286
3287         return rc;
3288
3289 qdir_exit:
3290         free_rsp_buf(resp_buftype, rsp);
3291         return rc;
3292 }
3293
3294 static int
3295 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3296                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3297                u8 info_type, u32 additional_info, unsigned int num,
3298                 void **data, unsigned int *size)
3299 {
3300         struct smb2_set_info_req *req;
3301         struct smb2_set_info_rsp *rsp = NULL;
3302         struct kvec *iov;
3303         struct kvec rsp_iov;
3304         int rc = 0;
3305         int resp_buftype;
3306         unsigned int i;
3307         struct cifs_ses *ses = tcon->ses;
3308         int flags = 0;
3309         unsigned int total_len;
3310
3311         if (!ses || !(ses->server))
3312                 return -EIO;
3313
3314         if (!num)
3315                 return -EINVAL;
3316
3317         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3318         if (!iov)
3319                 return -ENOMEM;
3320
3321         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3322         if (rc) {
3323                 kfree(iov);
3324                 return rc;
3325         }
3326
3327         if (encryption_required(tcon))
3328                 flags |= CIFS_TRANSFORM_REQ;
3329
3330         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3331
3332         req->InfoType = info_type;
3333         req->FileInfoClass = info_class;
3334         req->PersistentFileId = persistent_fid;
3335         req->VolatileFileId = volatile_fid;
3336         req->AdditionalInformation = cpu_to_le32(additional_info);
3337
3338         req->BufferOffset =
3339                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3340         req->BufferLength = cpu_to_le32(*size);
3341
3342         memcpy(req->Buffer, *data, *size);
3343         total_len += *size;
3344
3345         iov[0].iov_base = (char *)req;
3346         /* 1 for Buffer */
3347         iov[0].iov_len = total_len - 1;
3348
3349         for (i = 1; i < num; i++) {
3350                 le32_add_cpu(&req->BufferLength, size[i]);
3351                 iov[i].iov_base = (char *)data[i];
3352                 iov[i].iov_len = size[i];
3353         }
3354
3355         rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags,
3356                             &rsp_iov);
3357         cifs_small_buf_release(req);
3358         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3359
3360         if (rc != 0)
3361                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3362
3363         free_rsp_buf(resp_buftype, rsp);
3364         kfree(iov);
3365         return rc;
3366 }
3367
3368 int
3369 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3370             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3371 {
3372         struct smb2_file_rename_info info;
3373         void **data;
3374         unsigned int size[2];
3375         int rc;
3376         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3377
3378         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3379         if (!data)
3380                 return -ENOMEM;
3381
3382         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3383                               /* 0 = fail if target already exists */
3384         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3385         info.FileNameLength = cpu_to_le32(len);
3386
3387         data[0] = &info;
3388         size[0] = sizeof(struct smb2_file_rename_info);
3389
3390         data[1] = target_file;
3391         size[1] = len + 2 /* null */;
3392
3393         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3394                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3395                 0, 2, data, size);
3396         kfree(data);
3397         return rc;
3398 }
3399
3400 int
3401 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3402                   u64 persistent_fid, u64 volatile_fid)
3403 {
3404         __u8 delete_pending = 1;
3405         void *data;
3406         unsigned int size;
3407
3408         data = &delete_pending;
3409         size = 1; /* sizeof __u8 */
3410
3411         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3412                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3413                 0, 1, &data, &size);
3414 }
3415
3416 int
3417 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3418                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3419 {
3420         struct smb2_file_link_info info;
3421         void **data;
3422         unsigned int size[2];
3423         int rc;
3424         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3425
3426         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3427         if (!data)
3428                 return -ENOMEM;
3429
3430         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3431                               /* 0 = fail if link already exists */
3432         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3433         info.FileNameLength = cpu_to_le32(len);
3434
3435         data[0] = &info;
3436         size[0] = sizeof(struct smb2_file_link_info);
3437
3438         data[1] = target_file;
3439         size[1] = len + 2 /* null */;
3440
3441         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3442                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3443                         0, 2, data, size);
3444         kfree(data);
3445         return rc;
3446 }
3447
3448 int
3449 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3450              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3451 {
3452         struct smb2_file_eof_info info;
3453         void *data;
3454         unsigned int size;
3455
3456         info.EndOfFile = *eof;
3457
3458         data = &info;
3459         size = sizeof(struct smb2_file_eof_info);
3460
3461         if (is_falloc)
3462                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3463                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3464                         0, 1, &data, &size);
3465         else
3466                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3467                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3468                         0, 1, &data, &size);
3469 }
3470
3471 int
3472 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3473               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3474 {
3475         unsigned int size;
3476         size = sizeof(FILE_BASIC_INFO);
3477         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3478                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3479                 0, 1, (void **)&buf, &size);
3480 }
3481
3482 int
3483 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3484                 u64 persistent_fid, u64 volatile_fid,
3485                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3486 {
3487         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3488                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3489                         1, (void **)&pnntsd, &pacllen);
3490 }
3491
3492 int
3493 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3494             u64 persistent_fid, u64 volatile_fid,
3495             struct smb2_file_full_ea_info *buf, int len)
3496 {
3497         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3498                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3499                 0, 1, (void **)&buf, &len);
3500 }
3501
3502 int
3503 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3504                   const u64 persistent_fid, const u64 volatile_fid,
3505                   __u8 oplock_level)
3506 {
3507         int rc;
3508         struct smb2_oplock_break_req *req = NULL;
3509         struct cifs_ses *ses = tcon->ses;
3510         int flags = CIFS_OBREAK_OP;
3511         unsigned int total_len;
3512         struct kvec iov[1];
3513         struct kvec rsp_iov;
3514         int resp_buf_type;
3515
3516         cifs_dbg(FYI, "SMB2_oplock_break\n");
3517         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3518                              &total_len);
3519         if (rc)
3520                 return rc;
3521
3522         if (encryption_required(tcon))
3523                 flags |= CIFS_TRANSFORM_REQ;
3524
3525         req->VolatileFid = volatile_fid;
3526         req->PersistentFid = persistent_fid;
3527         req->OplockLevel = oplock_level;
3528         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3529
3530         flags |= CIFS_NO_RESP;
3531
3532         iov[0].iov_base = (char *)req;
3533         iov[0].iov_len = total_len;
3534
3535         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3536         cifs_small_buf_release(req);
3537
3538         if (rc) {
3539                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3540                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3541         }
3542
3543         return rc;
3544 }
3545
3546 static void
3547 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3548                         struct kstatfs *kst)
3549 {
3550         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3551                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3552         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3553         kst->f_bfree  = kst->f_bavail =
3554                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3555         return;
3556 }
3557
3558 static int
3559 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3560                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3561 {
3562         struct TCP_Server_Info *server;
3563         int rc;
3564         struct smb2_query_info_req *req;
3565         unsigned int total_len;
3566
3567         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3568
3569         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3570                 return -EIO;
3571
3572         server = tcon->ses->server;
3573
3574         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3575                              &total_len);
3576         if (rc)
3577                 return rc;
3578
3579         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3580         req->FileInfoClass = level;
3581         req->PersistentFileId = persistent_fid;
3582         req->VolatileFileId = volatile_fid;
3583         /* 1 for pad */
3584         req->InputBufferOffset =
3585                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3586         req->OutputBufferLength = cpu_to_le32(
3587                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - server->vals->header_preamble_size);
3588
3589         iov->iov_base = (char *)req;
3590         iov->iov_len = total_len;
3591         return 0;
3592 }
3593
3594 int
3595 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3596               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3597 {
3598         struct smb2_query_info_rsp *rsp = NULL;
3599         struct kvec iov;
3600         struct kvec rsp_iov;
3601         int rc = 0;
3602         int resp_buftype;
3603         struct cifs_ses *ses = tcon->ses;
3604         struct TCP_Server_Info *server = ses->server;
3605         struct smb2_fs_full_size_info *info = NULL;
3606         int flags = 0;
3607
3608         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3609                                 sizeof(struct smb2_fs_full_size_info),
3610                                 persistent_fid, volatile_fid);
3611         if (rc)
3612                 return rc;
3613
3614         if (encryption_required(tcon))
3615                 flags |= CIFS_TRANSFORM_REQ;
3616
3617         rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3618         cifs_small_buf_release(iov.iov_base);
3619         if (rc) {
3620                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3621                 goto qfsinf_exit;
3622         }
3623         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3624
3625         info = (struct smb2_fs_full_size_info *)(server->vals->header_preamble_size +
3626                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3627         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3628                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3629                           sizeof(struct smb2_fs_full_size_info));
3630         if (!rc)
3631                 copy_fs_info_to_kstatfs(info, fsdata);
3632
3633 qfsinf_exit:
3634         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3635         return rc;
3636 }
3637
3638 int
3639 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3640               u64 persistent_fid, u64 volatile_fid, int level)
3641 {
3642         struct smb2_query_info_rsp *rsp = NULL;
3643         struct kvec iov;
3644         struct kvec rsp_iov;
3645         int rc = 0;
3646         int resp_buftype, max_len, min_len;
3647         struct cifs_ses *ses = tcon->ses;
3648         struct TCP_Server_Info *server = ses->server;
3649         unsigned int rsp_len, offset;
3650         int flags = 0;
3651
3652         if (level == FS_DEVICE_INFORMATION) {
3653                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3654                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3655         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3656                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3657                 min_len = MIN_FS_ATTR_INFO_SIZE;
3658         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3659                 max_len = sizeof(struct smb3_fs_ss_info);
3660                 min_len = sizeof(struct smb3_fs_ss_info);
3661         } else {
3662                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3663                 return -EINVAL;
3664         }
3665
3666         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3667                                 persistent_fid, volatile_fid);
3668         if (rc)
3669                 return rc;
3670
3671         if (encryption_required(tcon))
3672                 flags |= CIFS_TRANSFORM_REQ;
3673
3674         rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3675         cifs_small_buf_release(iov.iov_base);
3676         if (rc) {
3677                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3678                 goto qfsattr_exit;
3679         }
3680         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3681
3682         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3683         offset = le16_to_cpu(rsp->OutputBufferOffset);
3684         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3685         if (rc)
3686                 goto qfsattr_exit;
3687
3688         if (level == FS_ATTRIBUTE_INFORMATION)
3689                 memcpy(&tcon->fsAttrInfo, server->vals->header_preamble_size + offset
3690                         + (char *)&rsp->hdr, min_t(unsigned int,
3691                         rsp_len, max_len));
3692         else if (level == FS_DEVICE_INFORMATION)
3693                 memcpy(&tcon->fsDevInfo, server->vals->header_preamble_size + offset
3694                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3695         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3696                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3697                         (server->vals->header_preamble_size + offset + (char *)&rsp->hdr);
3698                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3699                 tcon->perf_sector_size =
3700                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3701         }
3702
3703 qfsattr_exit:
3704         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3705         return rc;
3706 }
3707
3708 int
3709 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3710            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3711            const __u32 num_lock, struct smb2_lock_element *buf)
3712 {
3713         int rc = 0;
3714         struct smb2_lock_req *req = NULL;
3715         struct kvec iov[2];
3716         struct kvec rsp_iov;
3717         int resp_buf_type;
3718         unsigned int count;
3719         int flags = CIFS_NO_RESP;
3720         unsigned int total_len;
3721
3722         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3723
3724         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3725         if (rc)
3726                 return rc;
3727
3728         if (encryption_required(tcon))
3729                 flags |= CIFS_TRANSFORM_REQ;
3730
3731         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3732         req->LockCount = cpu_to_le16(num_lock);
3733
3734         req->PersistentFileId = persist_fid;
3735         req->VolatileFileId = volatile_fid;
3736
3737         count = num_lock * sizeof(struct smb2_lock_element);
3738
3739         iov[0].iov_base = (char *)req;
3740         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3741         iov[1].iov_base = (char *)buf;
3742         iov[1].iov_len = count;
3743
3744         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3745         rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3746                             &rsp_iov);
3747         cifs_small_buf_release(req);
3748         if (rc) {
3749                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3750                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3751         }
3752
3753         return rc;
3754 }
3755
3756 int
3757 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3758           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3759           const __u64 length, const __u64 offset, const __u32 lock_flags,
3760           const bool wait)
3761 {
3762         struct smb2_lock_element lock;
3763
3764         lock.Offset = cpu_to_le64(offset);
3765         lock.Length = cpu_to_le64(length);
3766         lock.Flags = cpu_to_le32(lock_flags);
3767         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3768                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3769
3770         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3771 }
3772
3773 int
3774 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3775                  __u8 *lease_key, const __le32 lease_state)
3776 {
3777         int rc;
3778         struct smb2_lease_ack *req = NULL;
3779         struct cifs_ses *ses = tcon->ses;
3780         int flags = CIFS_OBREAK_OP;
3781         unsigned int total_len;
3782         struct kvec iov[1];
3783         struct kvec rsp_iov;
3784         int resp_buf_type;
3785
3786         cifs_dbg(FYI, "SMB2_lease_break\n");
3787         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
3788                              &total_len);
3789         if (rc)
3790                 return rc;
3791
3792         if (encryption_required(tcon))
3793                 flags |= CIFS_TRANSFORM_REQ;
3794
3795         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3796         req->StructureSize = cpu_to_le16(36);
3797         total_len += 12;
3798
3799         memcpy(req->LeaseKey, lease_key, 16);
3800         req->LeaseState = lease_state;
3801
3802         flags |= CIFS_NO_RESP;
3803
3804         iov[0].iov_base = (char *)req;
3805         iov[0].iov_len = total_len;
3806
3807         rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3808         cifs_small_buf_release(req);
3809
3810         if (rc) {
3811                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3812                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3813         }
3814
3815         return rc;
3816 }