fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (retries && --retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect) {
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355                 if ((rc == -EACCES) && !tcon->retry) {
 356                         rc = -EHOSTDOWN;
 357                         mutex_unlock(&tcon->ses->session_mutex);
 358                         goto failed;
 359                 } else if (rc) {
 360                         mutex_unlock(&ses->session_mutex);
 361                         goto out;
 362                 }
 363         }
 364         if (rc || !tcon->need_reconnect) {
 365                 mutex_unlock(&tcon->ses->session_mutex);
 366                 goto out;
 367         }
 368
 369         cifs_mark_open_files_invalid(tcon);
 370         if (tcon->use_persistent)
 371                 tcon->need_reopen_files = true;
 372
 373         rc = __smb2_reconnect(nls_codepage, tcon);
 374         mutex_unlock(&tcon->ses->session_mutex);
 375
 376         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 377         if (rc) {
 378                 /* If sess reconnected but tcon didn't, something strange ... */
 379                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 380                 goto out;
 381         }
 382
 383         if (smb2_command != SMB2_INTERNAL_CMD)
 384                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 385
 386         atomic_inc(&tconInfoReconnectCount);
 387 out:
 388         /*
 389          * Check if handle based operation so we know whether we can continue
 390          * or not without returning to caller to reset file handle.
 391          */
 392         /*
 393          * BB Is flush done by server on drop of tcp session? Should we special
 394          * case it and skip above?
 395          */
 396         switch (smb2_command) {
 397         case SMB2_FLUSH:
 398         case SMB2_READ:
 399         case SMB2_WRITE:
 400         case SMB2_LOCK:
 401         case SMB2_IOCTL:
 402         case SMB2_QUERY_DIRECTORY:
 403         case SMB2_CHANGE_NOTIFY:
 404         case SMB2_QUERY_INFO:
 405         case SMB2_SET_INFO:
 406                 rc = -EAGAIN;
 407         }
 408 failed:
 409         unload_nls(nls_codepage);
 410         return rc;
 411 }
 412
 413 static void
 414 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 415                unsigned int *total_len)
 416 {
 417         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 418         /* lookup word count ie StructureSize from table */
 419         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 420
 421         /*
 422          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 423          * largest operations (Create)
 424          */
 425         memset(buf, 0, 256);
 426
 427         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 428         spdu->StructureSize2 = cpu_to_le16(parmsize);
 429
 430         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 431 }
 432
 433 /*
 434  * Allocate and return pointer to an SMB request hdr, and set basic
 435  * SMB information in the SMB header. If the return code is zero, this
 436  * function must have filled in request_buf pointer.
 437  */
 438 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 439                                   void **request_buf, unsigned int *total_len)
 440 {
 441         /* BB eventually switch this to SMB2 specific small buf size */
 442         if (smb2_command == SMB2_SET_INFO)
 443                 *request_buf = cifs_buf_get();
 444         else
 445                 *request_buf = cifs_small_buf_get();
 446         if (*request_buf == NULL) {
 447                 /* BB should we add a retry in here if not a writepage? */
 448                 return -ENOMEM;
 449         }
 450
 451         fill_small_buf(smb2_command, tcon,
 452                        (struct smb2_sync_hdr *)(*request_buf),
 453                        total_len);
 454
 455         if (tcon != NULL) {
 456                 uint16_t com_code = le16_to_cpu(smb2_command);
 457                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 458                 cifs_stats_inc(&tcon->num_smbs_sent);
 459         }
 460
 461         return 0;
 462 }
 463
 464 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 465                                void **request_buf, unsigned int *total_len)
 466 {
 467         int rc;
 468
 469         rc = smb2_reconnect(smb2_command, tcon);
 470         if (rc)
 471                 return rc;
 472
 473         return __smb2_plain_req_init(smb2_command, tcon, request_buf,
 474                                      total_len);
 475 }
 476
 477 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 478                                void **request_buf, unsigned int *total_len)
 479 {
 480         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 481         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 482                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf,
 483                                              total_len);
 484         }
 485         return smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len);
 486 }
 487
 488 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 489
 490 static void
 491 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 492 {
 493         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 494         pneg_ctxt->DataLength = cpu_to_le16(38);
 495         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 496         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 497         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 498         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 499 }
 500
 501 static void
 502 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 503 {
 504         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 505         pneg_ctxt->DataLength =
 506                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 507                           - sizeof(struct smb2_neg_context));
 508         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 509         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 510         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 511         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 512 }
 513
 514 static void
 515 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 516 {
 517         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 518         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 519         pneg_ctxt->CipherCount = cpu_to_le16(2);
 520         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 521         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 522 }
 523
 524 static unsigned int
 525 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 526 {
 527         struct nls_table *cp = load_nls_default();
 528
 529         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 530
 531         /* copy up to max of first 100 bytes of server name to NetName field */
 532         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 533         /* context size is DataLength + minimal smb2_neg_context */
 534         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 535                         sizeof(struct smb2_neg_context), 8) * 8;
 536 }
 537
 538 static void
 539 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 540 {
 541         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 542         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 543         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 544         pneg_ctxt->Name[0] = 0x93;
 545         pneg_ctxt->Name[1] = 0xAD;
 546         pneg_ctxt->Name[2] = 0x25;
 547         pneg_ctxt->Name[3] = 0x50;
 548         pneg_ctxt->Name[4] = 0x9C;
 549         pneg_ctxt->Name[5] = 0xB4;
 550         pneg_ctxt->Name[6] = 0x11;
 551         pneg_ctxt->Name[7] = 0xE7;
 552         pneg_ctxt->Name[8] = 0xB4;
 553         pneg_ctxt->Name[9] = 0x23;
 554         pneg_ctxt->Name[10] = 0x83;
 555         pneg_ctxt->Name[11] = 0xDE;
 556         pneg_ctxt->Name[12] = 0x96;
 557         pneg_ctxt->Name[13] = 0x8B;
 558         pneg_ctxt->Name[14] = 0xCD;
 559         pneg_ctxt->Name[15] = 0x7C;
 560 }
 561
 562 static void
 563 assemble_neg_contexts(struct smb2_negotiate_req *req,
 564                       struct TCP_Server_Info *server, unsigned int *total_len)
 565 {
 566         char *pneg_ctxt = (char *)req;
 567         unsigned int ctxt_len;
 568
 569         if (*total_len > 200) {
 570                 /* In case length corrupted don't want to overrun smb buffer */
 571                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 572                 return;
 573         }
 574
 575         /*
 576          * round up total_len of fixed part of SMB3 negotiate request to 8
 577          * byte boundary before adding negotiate contexts
 578          */
 579         *total_len = roundup(*total_len, 8);
 580
 581         pneg_ctxt = (*total_len) + (char *)req;
 582         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 583
 584         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 585         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 586         *total_len += ctxt_len;
 587         pneg_ctxt += ctxt_len;
 588
 589         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 590         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 591         *total_len += ctxt_len;
 592         pneg_ctxt += ctxt_len;
 593
 594         if (server->compress_algorithm) {
 595                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 596                                 pneg_ctxt);
 597                 ctxt_len = DIV_ROUND_UP(
 598                         sizeof(struct smb2_compression_capabilities_context),
 599                                 8) * 8;
 600                 *total_len += ctxt_len;
 601                 pneg_ctxt += ctxt_len;
 602                 req->NegotiateContextCount = cpu_to_le16(5);
 603         } else
 604                 req->NegotiateContextCount = cpu_to_le16(4);
 605
 606         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 607                                         server->hostname);
 608         *total_len += ctxt_len;
 609         pneg_ctxt += ctxt_len;
 610
 611         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 612         *total_len += sizeof(struct smb2_posix_neg_context);
 613 }
 614
 615 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 616 {
 617         unsigned int len = le16_to_cpu(ctxt->DataLength);
 618
 619         /* If invalid preauth context warn but use what we requested, SHA-512 */
 620         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 621                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 622                 return;
 623         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 624                 pr_warn_once("server sent invalid SaltLength\n");
 625                 return;
 626         }
 627         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 628                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 629         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 630                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 631 }
 632
 633 static void decode_compress_ctx(struct TCP_Server_Info *server,
 634                          struct smb2_compression_capabilities_context *ctxt)
 635 {
 636         unsigned int len = le16_to_cpu(ctxt->DataLength);
 637
 638         /* sizeof compress context is a one element compression capbility struct */
 639         if (len < 10) {
 640                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 641                 return;
 642         }
 643         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 644                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 645                 return;
 646         }
 647         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 648                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 649                 return;
 650         }
 651         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 652 }
 653
 654 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 655                               struct smb2_encryption_neg_context *ctxt)
 656 {
 657         unsigned int len = le16_to_cpu(ctxt->DataLength);
 658
 659         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 660         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 661                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 662                 return -EINVAL;
 663         }
 664
 665         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 666                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 667                 return -EINVAL;
 668         }
 669         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 670         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 671             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 672                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 673                 return -EINVAL;
 674         }
 675         server->cipher_type = ctxt->Ciphers[0];
 676         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 677         return 0;
 678 }
 679
 680 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 681                                      struct TCP_Server_Info *server,
 682                                      unsigned int len_of_smb)
 683 {
 684         struct smb2_neg_context *pctx;
 685         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 686         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 687         unsigned int len_of_ctxts, i;
 688         int rc = 0;
 689
 690         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 691         if (len_of_smb <= offset) {
 692                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 693                 return -EINVAL;
 694         }
 695
 696         len_of_ctxts = len_of_smb - offset;
 697
 698         for (i = 0; i < ctxt_cnt; i++) {
 699                 int clen;
 700                 /* check that offset is not beyond end of SMB */
 701                 if (len_of_ctxts == 0)
 702                         break;
 703
 704                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 705                         break;
 706
 707                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 708                 clen = le16_to_cpu(pctx->DataLength);
 709                 if (clen > len_of_ctxts)
 710                         break;
 711
 712                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 713                         decode_preauth_context(
 714                                 (struct smb2_preauth_neg_context *)pctx);
 715                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 716                         rc = decode_encrypt_ctx(server,
 717                                 (struct smb2_encryption_neg_context *)pctx);
 718                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 719                         decode_compress_ctx(server,
 720                                 (struct smb2_compression_capabilities_context *)pctx);
 721                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 722                         server->posix_ext_supported = true;
 723                 else
 724                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 725                                 le16_to_cpu(pctx->ContextType));
 726
 727                 if (rc)
 728                         break;
 729                 /* offsets must be 8 byte aligned */
 730                 clen = (clen + 7) & ~0x7;
 731                 offset += clen + sizeof(struct smb2_neg_context);
 732                 len_of_ctxts -= clen;
 733         }
 734         return rc;
 735 }
 736
 737 static struct create_posix *
 738 create_posix_buf(umode_t mode)
 739 {
 740         struct create_posix *buf;
 741
 742         buf = kzalloc(sizeof(struct create_posix),
 743                         GFP_KERNEL);
 744         if (!buf)
 745                 return NULL;
 746
 747         buf->ccontext.DataOffset =
 748                 cpu_to_le16(offsetof(struct create_posix, Mode));
 749         buf->ccontext.DataLength = cpu_to_le32(4);
 750         buf->ccontext.NameOffset =
 751                 cpu_to_le16(offsetof(struct create_posix, Name));
 752         buf->ccontext.NameLength = cpu_to_le16(16);
 753
 754         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 755         buf->Name[0] = 0x93;
 756         buf->Name[1] = 0xAD;
 757         buf->Name[2] = 0x25;
 758         buf->Name[3] = 0x50;
 759         buf->Name[4] = 0x9C;
 760         buf->Name[5] = 0xB4;
 761         buf->Name[6] = 0x11;
 762         buf->Name[7] = 0xE7;
 763         buf->Name[8] = 0xB4;
 764         buf->Name[9] = 0x23;
 765         buf->Name[10] = 0x83;
 766         buf->Name[11] = 0xDE;
 767         buf->Name[12] = 0x96;
 768         buf->Name[13] = 0x8B;
 769         buf->Name[14] = 0xCD;
 770         buf->Name[15] = 0x7C;
 771         buf->Mode = cpu_to_le32(mode);
 772         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 773         return buf;
 774 }
 775
 776 static int
 777 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 778 {
 779         struct smb2_create_req *req = iov[0].iov_base;
 780         unsigned int num = *num_iovec;
 781
 782         iov[num].iov_base = create_posix_buf(mode);
 783         if (mode == ACL_NO_MODE)
 784                 cifs_dbg(FYI, "illegal mode\n");
 785         if (iov[num].iov_base == NULL)
 786                 return -ENOMEM;
 787         iov[num].iov_len = sizeof(struct create_posix);
 788         if (!req->CreateContextsOffset)
 789                 req->CreateContextsOffset = cpu_to_le32(
 790                                 sizeof(struct smb2_create_req) +
 791                                 iov[num - 1].iov_len);
 792         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 793         *num_iovec = num + 1;
 794         return 0;
 795 }
 796
 797
 798 /*
 799  *
 800  *      SMB2 Worker functions follow:
 801  *
 802  *      The general structure of the worker functions is:
 803  *      1) Call smb2_init (assembles SMB2 header)
 804  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 805  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 806  *      4) Decode SMB2 command specific fields in the fixed length area
 807  *      5) Decode variable length data area (if any for this SMB2 command type)
 808  *      6) Call free smb buffer
 809  *      7) return
 810  *
 811  */
 812
 813 int
 814 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 815 {
 816         struct smb_rqst rqst;
 817         struct smb2_negotiate_req *req;
 818         struct smb2_negotiate_rsp *rsp;
 819         struct kvec iov[1];
 820         struct kvec rsp_iov;
 821         int rc = 0;
 822         int resp_buftype;
 823         struct TCP_Server_Info *server = ses->server;
 824         int blob_offset, blob_length;
 825         char *security_blob;
 826         int flags = CIFS_NEG_OP;
 827         unsigned int total_len;
 828
 829         cifs_dbg(FYI, "Negotiate protocol\n");
 830
 831         if (!server) {
 832                 WARN(1, "%s: server is NULL!\n", __func__);
 833                 return -EIO;
 834         }
 835
 836         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 837         if (rc)
 838                 return rc;
 839
 840         req->sync_hdr.SessionId = 0;
 841
 842         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 843         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 844
 845         if (strcmp(ses->server->vals->version_string,
 846                    SMB3ANY_VERSION_STRING) == 0) {
 847                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 848                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 849                 req->DialectCount = cpu_to_le16(2);
 850                 total_len += 4;
 851         } else if (strcmp(server->vals->version_string,
 852                    SMBDEFAULT_VERSION_STRING) == 0) {
 853                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 854                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 855                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 856                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 857                 req->DialectCount = cpu_to_le16(4);
 858                 total_len += 8;
 859         } else {
 860                 /* otherwise send specific dialect */
 861                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 862                 req->DialectCount = cpu_to_le16(1);
 863                 total_len += 2;
 864         }
 865
 866         /* only one of SMB2 signing flags may be set in SMB2 request */
 867         if (ses->sign)
 868                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 869         else if (global_secflags & CIFSSEC_MAY_SIGN)
 870                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 871         else
 872                 req->SecurityMode = 0;
 873
 874         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 875
 876         /* ClientGUID must be zero for SMB2.02 dialect */
 877         if (server->vals->protocol_id == SMB20_PROT_ID)
 878                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 879         else {
 880                 memcpy(req->ClientGUID, server->client_guid,
 881                         SMB2_CLIENT_GUID_SIZE);
 882                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 883                     (strcmp(server->vals->version_string,
 884                      SMBDEFAULT_VERSION_STRING) == 0))
 885                         assemble_neg_contexts(req, server, &total_len);
 886         }
 887         iov[0].iov_base = (char *)req;
 888         iov[0].iov_len = total_len;
 889
 890         memset(&rqst, 0, sizeof(struct smb_rqst));
 891         rqst.rq_iov = iov;
 892         rqst.rq_nvec = 1;
 893
 894         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 895         cifs_small_buf_release(req);
 896         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 897         /*
 898          * No tcon so can't do
 899          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 900          */
 901         if (rc == -EOPNOTSUPP) {
 902                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider "
 903                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 904                         " older servers\n");
 905                 goto neg_exit;
 906         } else if (rc != 0)
 907                 goto neg_exit;
 908
 909         if (strcmp(server->vals->version_string,
 910                    SMB3ANY_VERSION_STRING) == 0) {
 911                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 912                         cifs_server_dbg(VFS,
 913                                 "SMB2 dialect returned but not requested\n");
 914                         return -EIO;
 915                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 916                         cifs_server_dbg(VFS,
 917                                 "SMB2.1 dialect returned but not requested\n");
 918                         return -EIO;
 919                 }
 920         } else if (strcmp(server->vals->version_string,
 921                    SMBDEFAULT_VERSION_STRING) == 0) {
 922                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 923                         cifs_server_dbg(VFS,
 924                                 "SMB2 dialect returned but not requested\n");
 925                         return -EIO;
 926                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 927                         /* ops set to 3.0 by default for default so update */
 928                         server->ops = &smb21_operations;
 929                         server->vals = &smb21_values;
 930                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 931                         server->ops = &smb311_operations;
 932                         server->vals = &smb311_values;
 933                 }
 934         } else if (le16_to_cpu(rsp->DialectRevision) !=
 935                                 server->vals->protocol_id) {
 936                 /* if requested single dialect ensure returned dialect matched */
 937                 cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 938                         le16_to_cpu(rsp->DialectRevision));
 939                 return -EIO;
 940         }
 941
 942         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 943
 944         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 945                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 946         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 947                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 948         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 949                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 950         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 951                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 952         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 953                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 954         else {
 955                 cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 956                          le16_to_cpu(rsp->DialectRevision));
 957                 rc = -EIO;
 958                 goto neg_exit;
 959         }
 960         server->dialect = le16_to_cpu(rsp->DialectRevision);
 961
 962         /*
 963          * Keep a copy of the hash after negprot. This hash will be
 964          * the starting hash value for all sessions made from this
 965          * server.
 966          */
 967         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 968                SMB2_PREAUTH_HASH_SIZE);
 969
 970         /* SMB2 only has an extended negflavor */
 971         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 972         /* set it to the maximum buffer size value we can send with 1 credit */
 973         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 974                                SMB2_MAX_BUFFER_SIZE);
 975         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 976         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 977         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 978         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 979                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 980                                 server->sec_mode);
 981         server->capabilities = le32_to_cpu(rsp->Capabilities);
 982         /* Internal types */
 983         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 984
 985         /*
 986          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
 987          * Set the cipher type manually.
 988          */
 989         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 990                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
 991
 992         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 993                                                (struct smb2_sync_hdr *)rsp);
 994         /*
 995          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 996          * for us will be
 997          *      ses->sectype = RawNTLMSSP;
 998          * but for time being this is our only auth choice so doesn't matter.
 999          * We just found a server which sets blob length to zero expecting raw.
1000          */
1001         if (blob_length == 0) {
1002                 cifs_dbg(FYI, "missing security blob on negprot\n");
1003                 server->sec_ntlmssp = true;
1004         }
1005
1006         rc = cifs_enable_signing(server, ses->sign);
1007         if (rc)
1008                 goto neg_exit;
1009         if (blob_length) {
1010                 rc = decode_negTokenInit(security_blob, blob_length, server);
1011                 if (rc == 1)
1012                         rc = 0;
1013                 else if (rc == 0)
1014                         rc = -EIO;
1015         }
1016
1017         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1018                 if (rsp->NegotiateContextCount)
1019                         rc = smb311_decode_neg_context(rsp, server,
1020                                                        rsp_iov.iov_len);
1021                 else
1022                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1023         }
1024 neg_exit:
1025         free_rsp_buf(resp_buftype, rsp);
1026         return rc;
1027 }
1028
1029 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1030 {
1031         int rc;
1032         struct validate_negotiate_info_req *pneg_inbuf;
1033         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1034         u32 rsplen;
1035         u32 inbuflen; /* max of 4 dialects */
1036         struct TCP_Server_Info *server = tcon->ses->server;
1037
1038         cifs_dbg(FYI, "validate negotiate\n");
1039
1040         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1041         if (server->dialect == SMB311_PROT_ID)
1042                 return 0;
1043
1044         /*
1045          * validation ioctl must be signed, so no point sending this if we
1046          * can not sign it (ie are not known user).  Even if signing is not
1047          * required (enabled but not negotiated), in those cases we selectively
1048          * sign just this, the first and only signed request on a connection.
1049          * Having validation of negotiate info  helps reduce attack vectors.
1050          */
1051         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1052                 return 0; /* validation requires signing */
1053
1054         if (tcon->ses->user_name == NULL) {
1055                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1056                 return 0; /* validation requires signing */
1057         }
1058
1059         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1060                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1061
1062         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1063         if (!pneg_inbuf)
1064                 return -ENOMEM;
1065
1066         pneg_inbuf->Capabilities =
1067                         cpu_to_le32(server->vals->req_capabilities);
1068         memcpy(pneg_inbuf->Guid, server->client_guid,
1069                                         SMB2_CLIENT_GUID_SIZE);
1070
1071         if (tcon->ses->sign)
1072                 pneg_inbuf->SecurityMode =
1073                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1074         else if (global_secflags & CIFSSEC_MAY_SIGN)
1075                 pneg_inbuf->SecurityMode =
1076                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1077         else
1078                 pneg_inbuf->SecurityMode = 0;
1079
1080
1081         if (strcmp(server->vals->version_string,
1082                 SMB3ANY_VERSION_STRING) == 0) {
1083                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1084                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1085                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1086                 /* structure is big enough for 3 dialects, sending only 2 */
1087                 inbuflen = sizeof(*pneg_inbuf) -
1088                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1089         } else if (strcmp(server->vals->version_string,
1090                 SMBDEFAULT_VERSION_STRING) == 0) {
1091                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1092                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1093                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1094                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1095                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1096                 /* structure is big enough for 3 dialects */
1097                 inbuflen = sizeof(*pneg_inbuf);
1098         } else {
1099                 /* otherwise specific dialect was requested */
1100                 pneg_inbuf->Dialects[0] =
1101                         cpu_to_le16(server->vals->protocol_id);
1102                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1103                 /* structure is big enough for 4 dialects, sending only 1 */
1104                 inbuflen = sizeof(*pneg_inbuf) -
1105                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1106         }
1107
1108         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1109                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1110                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1111                 (char **)&pneg_rsp, &rsplen);
1112         if (rc == -EOPNOTSUPP) {
1113                 /*
1114                  * Old Windows versions or Netapp SMB server can return
1115                  * not supported error. Client should accept it.
1116                  */
1117                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1118                 rc = 0;
1119                 goto out_free_inbuf;
1120         } else if (rc != 0) {
1121                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1122                 rc = -EIO;
1123                 goto out_free_inbuf;
1124         }
1125
1126         rc = -EIO;
1127         if (rsplen != sizeof(*pneg_rsp)) {
1128                 cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1129                          rsplen);
1130
1131                 /* relax check since Mac returns max bufsize allowed on ioctl */
1132                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1133                         goto out_free_rsp;
1134         }
1135
1136         /* check validate negotiate info response matches what we got earlier */
1137         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1138                 goto vneg_out;
1139
1140         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1141                 goto vneg_out;
1142
1143         /* do not validate server guid because not saved at negprot time yet */
1144
1145         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1146               SMB2_LARGE_FILES) != server->capabilities)
1147                 goto vneg_out;
1148
1149         /* validate negotiate successful */
1150         rc = 0;
1151         cifs_dbg(FYI, "validate negotiate info successful\n");
1152         goto out_free_rsp;
1153
1154 vneg_out:
1155         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1156 out_free_rsp:
1157         kfree(pneg_rsp);
1158 out_free_inbuf:
1159         kfree(pneg_inbuf);
1160         return rc;
1161 }
1162
1163 enum securityEnum
1164 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1165 {
1166         switch (requested) {
1167         case Kerberos:
1168         case RawNTLMSSP:
1169                 return requested;
1170         case NTLMv2:
1171                 return RawNTLMSSP;
1172         case Unspecified:
1173                 if (server->sec_ntlmssp &&
1174                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1175                         return RawNTLMSSP;
1176                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1177                         (global_secflags & CIFSSEC_MAY_KRB5))
1178                         return Kerberos;
1179                 /* Fallthrough */
1180         default:
1181                 return Unspecified;
1182         }
1183 }
1184
1185 struct SMB2_sess_data {
1186         unsigned int xid;
1187         struct cifs_ses *ses;
1188         struct nls_table *nls_cp;
1189         void (*func)(struct SMB2_sess_data *);
1190         int result;
1191         u64 previous_session;
1192
1193         /* we will send the SMB in three pieces:
1194          * a fixed length beginning part, an optional
1195          * SPNEGO blob (which can be zero length), and a
1196          * last part which will include the strings
1197          * and rest of bcc area. This allows us to avoid
1198          * a large buffer 17K allocation
1199          */
1200         int buf0_type;
1201         struct kvec iov[2];
1202 };
1203
1204 static int
1205 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1206 {
1207         int rc;
1208         struct cifs_ses *ses = sess_data->ses;
1209         struct smb2_sess_setup_req *req;
1210         struct TCP_Server_Info *server = ses->server;
1211         unsigned int total_len;
1212
1213         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1214                              &total_len);
1215         if (rc)
1216                 return rc;
1217
1218         /* First session, not a reauthenticate */
1219         req->sync_hdr.SessionId = 0;
1220
1221         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1222         req->PreviousSessionId = sess_data->previous_session;
1223
1224         req->Flags = 0; /* MBZ */
1225
1226         /* enough to enable echos and oplocks and one max size write */
1227         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1228
1229         /* only one of SMB2 signing flags may be set in SMB2 request */
1230         if (server->sign)
1231                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1232         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1233                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1234         else
1235                 req->SecurityMode = 0;
1236
1237 #ifdef CONFIG_CIFS_DFS_UPCALL
1238         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1239 #else
1240         req->Capabilities = 0;
1241 #endif /* DFS_UPCALL */
1242
1243         req->Channel = 0; /* MBZ */
1244
1245         sess_data->iov[0].iov_base = (char *)req;
1246         /* 1 for pad */
1247         sess_data->iov[0].iov_len = total_len - 1;
1248         /*
1249          * This variable will be used to clear the buffer
1250          * allocated above in case of any error in the calling function.
1251          */
1252         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1253
1254         return 0;
1255 }
1256
1257 static void
1258 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1259 {
1260         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1261         sess_data->buf0_type = CIFS_NO_BUFFER;
1262 }
1263
1264 static int
1265 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1266 {
1267         int rc;
1268         struct smb_rqst rqst;
1269         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1270         struct kvec rsp_iov = { NULL, 0 };
1271
1272         /* Testing shows that buffer offset must be at location of Buffer[0] */
1273         req->SecurityBufferOffset =
1274                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1275         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1276
1277         memset(&rqst, 0, sizeof(struct smb_rqst));
1278         rqst.rq_iov = sess_data->iov;
1279         rqst.rq_nvec = 2;
1280
1281         /* BB add code to build os and lm fields */
1282         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1283                             &rqst,
1284                             &sess_data->buf0_type,
1285                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1286         cifs_small_buf_release(sess_data->iov[0].iov_base);
1287         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1288
1289         return rc;
1290 }
1291
1292 static int
1293 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1294 {
1295         int rc = 0;
1296         struct cifs_ses *ses = sess_data->ses;
1297
1298         mutex_lock(&ses->server->srv_mutex);
1299         if (ses->server->ops->generate_signingkey) {
1300                 rc = ses->server->ops->generate_signingkey(ses);
1301                 if (rc) {
1302                         cifs_dbg(FYI,
1303                                 "SMB3 session key generation failed\n");
1304                         mutex_unlock(&ses->server->srv_mutex);
1305                         return rc;
1306                 }
1307         }
1308         if (!ses->server->session_estab) {
1309                 ses->server->sequence_number = 0x2;
1310                 ses->server->session_estab = true;
1311         }
1312         mutex_unlock(&ses->server->srv_mutex);
1313
1314         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1315         spin_lock(&GlobalMid_Lock);
1316         ses->status = CifsGood;
1317         ses->need_reconnect = false;
1318         spin_unlock(&GlobalMid_Lock);
1319         return rc;
1320 }
1321
1322 #ifdef CONFIG_CIFS_UPCALL
1323 static void
1324 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1325 {
1326         int rc;
1327         struct cifs_ses *ses = sess_data->ses;
1328         struct cifs_spnego_msg *msg;
1329         struct key *spnego_key = NULL;
1330         struct smb2_sess_setup_rsp *rsp = NULL;
1331
1332         rc = SMB2_sess_alloc_buffer(sess_data);
1333         if (rc)
1334                 goto out;
1335
1336         spnego_key = cifs_get_spnego_key(ses);
1337         if (IS_ERR(spnego_key)) {
1338                 rc = PTR_ERR(spnego_key);
1339                 if (rc == -ENOKEY)
1340                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1341                 spnego_key = NULL;
1342                 goto out;
1343         }
1344
1345         msg = spnego_key->payload.data[0];
1346         /*
1347          * check version field to make sure that cifs.upcall is
1348          * sending us a response in an expected form
1349          */
1350         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1351                 cifs_dbg(VFS,
1352                           "bad cifs.upcall version. Expected %d got %d",
1353                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1354                 rc = -EKEYREJECTED;
1355                 goto out_put_spnego_key;
1356         }
1357
1358         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1359                                          GFP_KERNEL);
1360         if (!ses->auth_key.response) {
1361                 cifs_dbg(VFS,
1362                         "Kerberos can't allocate (%u bytes) memory",
1363                         msg->sesskey_len);
1364                 rc = -ENOMEM;
1365                 goto out_put_spnego_key;
1366         }
1367         ses->auth_key.len = msg->sesskey_len;
1368
1369         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1370         sess_data->iov[1].iov_len = msg->secblob_len;
1371
1372         rc = SMB2_sess_sendreceive(sess_data);
1373         if (rc)
1374                 goto out_put_spnego_key;
1375
1376         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1377         ses->Suid = rsp->sync_hdr.SessionId;
1378
1379         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1380
1381         rc = SMB2_sess_establish_session(sess_data);
1382 out_put_spnego_key:
1383         key_invalidate(spnego_key);
1384         key_put(spnego_key);
1385 out:
1386         sess_data->result = rc;
1387         sess_data->func = NULL;
1388         SMB2_sess_free_buffer(sess_data);
1389 }
1390 #else
1391 static void
1392 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1393 {
1394         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1395         sess_data->result = -EOPNOTSUPP;
1396         sess_data->func = NULL;
1397 }
1398 #endif
1399
1400 static void
1401 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1402
1403 static void
1404 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1405 {
1406         int rc;
1407         struct cifs_ses *ses = sess_data->ses;
1408         struct smb2_sess_setup_rsp *rsp = NULL;
1409         char *ntlmssp_blob = NULL;
1410         bool use_spnego = false; /* else use raw ntlmssp */
1411         u16 blob_length = 0;
1412
1413         /*
1414          * If memory allocation is successful, caller of this function
1415          * frees it.
1416          */
1417         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1418         if (!ses->ntlmssp) {
1419                 rc = -ENOMEM;
1420                 goto out_err;
1421         }
1422         ses->ntlmssp->sesskey_per_smbsess = true;
1423
1424         rc = SMB2_sess_alloc_buffer(sess_data);
1425         if (rc)
1426                 goto out_err;
1427
1428         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1429                                GFP_KERNEL);
1430         if (ntlmssp_blob == NULL) {
1431                 rc = -ENOMEM;
1432                 goto out;
1433         }
1434
1435         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1436         if (use_spnego) {
1437                 /* BB eventually need to add this */
1438                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1439                 rc = -EOPNOTSUPP;
1440                 goto out;
1441         } else {
1442                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1443                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1444         }
1445         sess_data->iov[1].iov_base = ntlmssp_blob;
1446         sess_data->iov[1].iov_len = blob_length;
1447
1448         rc = SMB2_sess_sendreceive(sess_data);
1449         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1450
1451         /* If true, rc here is expected and not an error */
1452         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1453                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1454                 rc = 0;
1455
1456         if (rc)
1457                 goto out;
1458
1459         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1460                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1461                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1462                         le16_to_cpu(rsp->SecurityBufferOffset));
1463                 rc = -EIO;
1464                 goto out;
1465         }
1466         rc = decode_ntlmssp_challenge(rsp->Buffer,
1467                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1468         if (rc)
1469                 goto out;
1470
1471         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1472
1473
1474         ses->Suid = rsp->sync_hdr.SessionId;
1475         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1476
1477 out:
1478         kfree(ntlmssp_blob);
1479         SMB2_sess_free_buffer(sess_data);
1480         if (!rc) {
1481                 sess_data->result = 0;
1482                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1483                 return;
1484         }
1485 out_err:
1486         kfree(ses->ntlmssp);
1487         ses->ntlmssp = NULL;
1488         sess_data->result = rc;
1489         sess_data->func = NULL;
1490 }
1491
1492 static void
1493 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1494 {
1495         int rc;
1496         struct cifs_ses *ses = sess_data->ses;
1497         struct smb2_sess_setup_req *req;
1498         struct smb2_sess_setup_rsp *rsp = NULL;
1499         unsigned char *ntlmssp_blob = NULL;
1500         bool use_spnego = false; /* else use raw ntlmssp */
1501         u16 blob_length = 0;
1502
1503         rc = SMB2_sess_alloc_buffer(sess_data);
1504         if (rc)
1505                 goto out;
1506
1507         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1508         req->sync_hdr.SessionId = ses->Suid;
1509
1510         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1511                                         sess_data->nls_cp);
1512         if (rc) {
1513                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1514                 goto out;
1515         }
1516
1517         if (use_spnego) {
1518                 /* BB eventually need to add this */
1519                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1520                 rc = -EOPNOTSUPP;
1521                 goto out;
1522         }
1523         sess_data->iov[1].iov_base = ntlmssp_blob;
1524         sess_data->iov[1].iov_len = blob_length;
1525
1526         rc = SMB2_sess_sendreceive(sess_data);
1527         if (rc)
1528                 goto out;
1529
1530         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1531
1532         ses->Suid = rsp->sync_hdr.SessionId;
1533         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1534
1535         rc = SMB2_sess_establish_session(sess_data);
1536 out:
1537         kfree(ntlmssp_blob);
1538         SMB2_sess_free_buffer(sess_data);
1539         kfree(ses->ntlmssp);
1540         ses->ntlmssp = NULL;
1541         sess_data->result = rc;
1542         sess_data->func = NULL;
1543 }
1544
1545 static int
1546 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1547 {
1548         int type;
1549
1550         type = smb2_select_sectype(ses->server, ses->sectype);
1551         cifs_dbg(FYI, "sess setup type %d\n", type);
1552         if (type == Unspecified) {
1553                 cifs_dbg(VFS,
1554                         "Unable to select appropriate authentication method!");
1555                 return -EINVAL;
1556         }
1557
1558         switch (type) {
1559         case Kerberos:
1560                 sess_data->func = SMB2_auth_kerberos;
1561                 break;
1562         case RawNTLMSSP:
1563                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1564                 break;
1565         default:
1566                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1567                 return -EOPNOTSUPP;
1568         }
1569
1570         return 0;
1571 }
1572
1573 int
1574 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1575                 const struct nls_table *nls_cp)
1576 {
1577         int rc = 0;
1578         struct TCP_Server_Info *server = ses->server;
1579         struct SMB2_sess_data *sess_data;
1580
1581         cifs_dbg(FYI, "Session Setup\n");
1582
1583         if (!server) {
1584                 WARN(1, "%s: server is NULL!\n", __func__);
1585                 return -EIO;
1586         }
1587
1588         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1589         if (!sess_data)
1590                 return -ENOMEM;
1591
1592         rc = SMB2_select_sec(ses, sess_data);
1593         if (rc)
1594                 goto out;
1595         sess_data->xid = xid;
1596         sess_data->ses = ses;
1597         sess_data->buf0_type = CIFS_NO_BUFFER;
1598         sess_data->nls_cp = (struct nls_table *) nls_cp;
1599         sess_data->previous_session = ses->Suid;
1600
1601         /*
1602          * Initialize the session hash with the server one.
1603          */
1604         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1605                SMB2_PREAUTH_HASH_SIZE);
1606
1607         while (sess_data->func)
1608                 sess_data->func(sess_data);
1609
1610         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1611                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1612         rc = sess_data->result;
1613 out:
1614         kfree(sess_data);
1615         return rc;
1616 }
1617
1618 int
1619 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1620 {
1621         struct smb_rqst rqst;
1622         struct smb2_logoff_req *req; /* response is also trivial struct */
1623         int rc = 0;
1624         struct TCP_Server_Info *server;
1625         int flags = 0;
1626         unsigned int total_len;
1627         struct kvec iov[1];
1628         struct kvec rsp_iov;
1629         int resp_buf_type;
1630
1631         cifs_dbg(FYI, "disconnect session %p\n", ses);
1632
1633         if (ses && (ses->server))
1634                 server = ses->server;
1635         else
1636                 return -EIO;
1637
1638         /* no need to send SMB logoff if uid already closed due to reconnect */
1639         if (ses->need_reconnect)
1640                 goto smb2_session_already_dead;
1641
1642         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1643         if (rc)
1644                 return rc;
1645
1646          /* since no tcon, smb2_init can not do this, so do here */
1647         req->sync_hdr.SessionId = ses->Suid;
1648
1649         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1650                 flags |= CIFS_TRANSFORM_REQ;
1651         else if (server->sign)
1652                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1653
1654         flags |= CIFS_NO_RSP_BUF;
1655
1656         iov[0].iov_base = (char *)req;
1657         iov[0].iov_len = total_len;
1658
1659         memset(&rqst, 0, sizeof(struct smb_rqst));
1660         rqst.rq_iov = iov;
1661         rqst.rq_nvec = 1;
1662
1663         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1664         cifs_small_buf_release(req);
1665         /*
1666          * No tcon so can't do
1667          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1668          */
1669
1670 smb2_session_already_dead:
1671         return rc;
1672 }
1673
1674 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1675 {
1676         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1677 }
1678
1679 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1680
1681 /* These are similar values to what Windows uses */
1682 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1683 {
1684         tcon->max_chunks = 256;
1685         tcon->max_bytes_chunk = 1048576;
1686         tcon->max_bytes_copy = 16777216;
1687 }
1688
1689 int
1690 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1691           struct cifs_tcon *tcon, const struct nls_table *cp)
1692 {
1693         struct smb_rqst rqst;
1694         struct smb2_tree_connect_req *req;
1695         struct smb2_tree_connect_rsp *rsp = NULL;
1696         struct kvec iov[2];
1697         struct kvec rsp_iov = { NULL, 0 };
1698         int rc = 0;
1699         int resp_buftype;
1700         int unc_path_len;
1701         __le16 *unc_path = NULL;
1702         int flags = 0;
1703         unsigned int total_len;
1704         struct TCP_Server_Info *server = ses->server;
1705
1706         cifs_dbg(FYI, "TCON\n");
1707
1708         if (!server || !tree)
1709                 return -EIO;
1710
1711         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1712         if (unc_path == NULL)
1713                 return -ENOMEM;
1714
1715         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1716         unc_path_len *= 2;
1717         if (unc_path_len < 2) {
1718                 kfree(unc_path);
1719                 return -EINVAL;
1720         }
1721
1722         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1723         tcon->tid = 0;
1724         atomic_set(&tcon->num_remote_opens, 0);
1725         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1726                              &total_len);
1727         if (rc) {
1728                 kfree(unc_path);
1729                 return rc;
1730         }
1731
1732         if (smb3_encryption_required(tcon))
1733                 flags |= CIFS_TRANSFORM_REQ;
1734
1735         iov[0].iov_base = (char *)req;
1736         /* 1 for pad */
1737         iov[0].iov_len = total_len - 1;
1738
1739         /* Testing shows that buffer offset must be at location of Buffer[0] */
1740         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1741                         - 1 /* pad */);
1742         req->PathLength = cpu_to_le16(unc_path_len - 2);
1743         iov[1].iov_base = unc_path;
1744         iov[1].iov_len = unc_path_len;
1745
1746         /*
1747          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1748          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1749          * (Samba servers don't always set the flag so also check if null user)
1750          */
1751         if ((server->dialect == SMB311_PROT_ID) &&
1752             !smb3_encryption_required(tcon) &&
1753             !(ses->session_flags &
1754                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1755             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1756                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1757
1758         memset(&rqst, 0, sizeof(struct smb_rqst));
1759         rqst.rq_iov = iov;
1760         rqst.rq_nvec = 2;
1761
1762         /* Need 64 for max size write so ask for more in case not there yet */
1763         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1764
1765         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1766         cifs_small_buf_release(req);
1767         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1768         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1769         if (rc != 0) {
1770                 if (tcon) {
1771                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1772                         tcon->need_reconnect = true;
1773                 }
1774                 goto tcon_error_exit;
1775         }
1776
1777         switch (rsp->ShareType) {
1778         case SMB2_SHARE_TYPE_DISK:
1779                 cifs_dbg(FYI, "connection to disk share\n");
1780                 break;
1781         case SMB2_SHARE_TYPE_PIPE:
1782                 tcon->pipe = true;
1783                 cifs_dbg(FYI, "connection to pipe share\n");
1784                 break;
1785         case SMB2_SHARE_TYPE_PRINT:
1786                 tcon->print = true;
1787                 cifs_dbg(FYI, "connection to printer\n");
1788                 break;
1789         default:
1790                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1791                 rc = -EOPNOTSUPP;
1792                 goto tcon_error_exit;
1793         }
1794
1795         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1796         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1797         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1798         tcon->tidStatus = CifsGood;
1799         tcon->need_reconnect = false;
1800         tcon->tid = rsp->sync_hdr.TreeId;
1801         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1802
1803         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1804             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1805                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1806
1807         if (tcon->seal &&
1808             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1809                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1810
1811         init_copy_chunk_defaults(tcon);
1812         if (server->ops->validate_negotiate)
1813                 rc = server->ops->validate_negotiate(xid, tcon);
1814 tcon_exit:
1815
1816         free_rsp_buf(resp_buftype, rsp);
1817         kfree(unc_path);
1818         return rc;
1819
1820 tcon_error_exit:
1821         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1822                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1823         }
1824         goto tcon_exit;
1825 }
1826
1827 int
1828 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1829 {
1830         struct smb_rqst rqst;
1831         struct smb2_tree_disconnect_req *req; /* response is trivial */
1832         int rc = 0;
1833         struct cifs_ses *ses = tcon->ses;
1834         int flags = 0;
1835         unsigned int total_len;
1836         struct kvec iov[1];
1837         struct kvec rsp_iov;
1838         int resp_buf_type;
1839
1840         cifs_dbg(FYI, "Tree Disconnect\n");
1841
1842         if (!ses || !(ses->server))
1843                 return -EIO;
1844
1845         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1846                 return 0;
1847
1848         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1849                              &total_len);
1850         if (rc)
1851                 return rc;
1852
1853         if (smb3_encryption_required(tcon))
1854                 flags |= CIFS_TRANSFORM_REQ;
1855
1856         flags |= CIFS_NO_RSP_BUF;
1857
1858         iov[0].iov_base = (char *)req;
1859         iov[0].iov_len = total_len;
1860
1861         memset(&rqst, 0, sizeof(struct smb_rqst));
1862         rqst.rq_iov = iov;
1863         rqst.rq_nvec = 1;
1864
1865         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1866         cifs_small_buf_release(req);
1867         if (rc)
1868                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1869
1870         return rc;
1871 }
1872
1873
1874 static struct create_durable *
1875 create_durable_buf(void)
1876 {
1877         struct create_durable *buf;
1878
1879         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1880         if (!buf)
1881                 return NULL;
1882
1883         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1884                                         (struct create_durable, Data));
1885         buf->ccontext.DataLength = cpu_to_le32(16);
1886         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1887                                 (struct create_durable, Name));
1888         buf->ccontext.NameLength = cpu_to_le16(4);
1889         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1890         buf->Name[0] = 'D';
1891         buf->Name[1] = 'H';
1892         buf->Name[2] = 'n';
1893         buf->Name[3] = 'Q';
1894         return buf;
1895 }
1896
1897 static struct create_durable *
1898 create_reconnect_durable_buf(struct cifs_fid *fid)
1899 {
1900         struct create_durable *buf;
1901
1902         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1903         if (!buf)
1904                 return NULL;
1905
1906         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1907                                         (struct create_durable, Data));
1908         buf->ccontext.DataLength = cpu_to_le32(16);
1909         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1910                                 (struct create_durable, Name));
1911         buf->ccontext.NameLength = cpu_to_le16(4);
1912         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1913         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1914         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1915         buf->Name[0] = 'D';
1916         buf->Name[1] = 'H';
1917         buf->Name[2] = 'n';
1918         buf->Name[3] = 'C';
1919         return buf;
1920 }
1921
1922 static void
1923 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1924 {
1925         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1926
1927         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1928                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1929         buf->IndexNumber = pdisk_id->DiskFileId;
1930 }
1931
1932 void
1933 smb2_parse_contexts(struct TCP_Server_Info *server,
1934                        struct smb2_create_rsp *rsp,
1935                        unsigned int *epoch, char *lease_key, __u8 *oplock,
1936                        struct smb2_file_all_info *buf)
1937 {
1938         char *data_offset;
1939         struct create_context *cc;
1940         unsigned int next;
1941         unsigned int remaining;
1942         char *name;
1943
1944         *oplock = 0;
1945         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1946         remaining = le32_to_cpu(rsp->CreateContextsLength);
1947         cc = (struct create_context *)data_offset;
1948
1949         /* Initialize inode number to 0 in case no valid data in qfid context */
1950         if (buf)
1951                 buf->IndexNumber = 0;
1952
1953         while (remaining >= sizeof(struct create_context)) {
1954                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1955                 if (le16_to_cpu(cc->NameLength) == 4 &&
1956                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1957                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1958                                                            lease_key);
1959                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1960                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1961                         parse_query_id_ctxt(cc, buf);
1962
1963                 next = le32_to_cpu(cc->Next);
1964                 if (!next)
1965                         break;
1966                 remaining -= next;
1967                 cc = (struct create_context *)((char *)cc + next);
1968         }
1969
1970         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1971                 *oplock = rsp->OplockLevel;
1972
1973         return;
1974 }
1975
1976 static int
1977 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1978                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1979 {
1980         struct smb2_create_req *req = iov[0].iov_base;
1981         unsigned int num = *num_iovec;
1982
1983         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1984         if (iov[num].iov_base == NULL)
1985                 return -ENOMEM;
1986         iov[num].iov_len = server->vals->create_lease_size;
1987         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1988         if (!req->CreateContextsOffset)
1989                 req->CreateContextsOffset = cpu_to_le32(
1990                                 sizeof(struct smb2_create_req) +
1991                                 iov[num - 1].iov_len);
1992         le32_add_cpu(&req->CreateContextsLength,
1993                      server->vals->create_lease_size);
1994         *num_iovec = num + 1;
1995         return 0;
1996 }
1997
1998 static struct create_durable_v2 *
1999 create_durable_v2_buf(struct cifs_open_parms *oparms)
2000 {
2001         struct cifs_fid *pfid = oparms->fid;
2002         struct create_durable_v2 *buf;
2003
2004         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2005         if (!buf)
2006                 return NULL;
2007
2008         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2009                                         (struct create_durable_v2, dcontext));
2010         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2011         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2012                                 (struct create_durable_v2, Name));
2013         buf->ccontext.NameLength = cpu_to_le16(4);
2014
2015         /*
2016          * NB: Handle timeout defaults to 0, which allows server to choose
2017          * (most servers default to 120 seconds) and most clients default to 0.
2018          * This can be overridden at mount ("handletimeout=") if the user wants
2019          * a different persistent (or resilient) handle timeout for all opens
2020          * opens on a particular SMB3 mount.
2021          */
2022         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2023         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2024         generate_random_uuid(buf->dcontext.CreateGuid);
2025         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2026
2027         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2028         buf->Name[0] = 'D';
2029         buf->Name[1] = 'H';
2030         buf->Name[2] = '2';
2031         buf->Name[3] = 'Q';
2032         return buf;
2033 }
2034
2035 static struct create_durable_handle_reconnect_v2 *
2036 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2037 {
2038         struct create_durable_handle_reconnect_v2 *buf;
2039
2040         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2041                         GFP_KERNEL);
2042         if (!buf)
2043                 return NULL;
2044
2045         buf->ccontext.DataOffset =
2046                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2047                                      dcontext));
2048         buf->ccontext.DataLength =
2049                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2050         buf->ccontext.NameOffset =
2051                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2052                             Name));
2053         buf->ccontext.NameLength = cpu_to_le16(4);
2054
2055         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2056         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2057         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2058         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2059
2060         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2061         buf->Name[0] = 'D';
2062         buf->Name[1] = 'H';
2063         buf->Name[2] = '2';
2064         buf->Name[3] = 'C';
2065         return buf;
2066 }
2067
2068 static int
2069 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2070                     struct cifs_open_parms *oparms)
2071 {
2072         struct smb2_create_req *req = iov[0].iov_base;
2073         unsigned int num = *num_iovec;
2074
2075         iov[num].iov_base = create_durable_v2_buf(oparms);
2076         if (iov[num].iov_base == NULL)
2077                 return -ENOMEM;
2078         iov[num].iov_len = sizeof(struct create_durable_v2);
2079         if (!req->CreateContextsOffset)
2080                 req->CreateContextsOffset =
2081                         cpu_to_le32(sizeof(struct smb2_create_req) +
2082                                                                 iov[1].iov_len);
2083         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2084         *num_iovec = num + 1;
2085         return 0;
2086 }
2087
2088 static int
2089 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2090                     struct cifs_open_parms *oparms)
2091 {
2092         struct smb2_create_req *req = iov[0].iov_base;
2093         unsigned int num = *num_iovec;
2094
2095         /* indicate that we don't need to relock the file */
2096         oparms->reconnect = false;
2097
2098         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2099         if (iov[num].iov_base == NULL)
2100                 return -ENOMEM;
2101         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2102         if (!req->CreateContextsOffset)
2103                 req->CreateContextsOffset =
2104                         cpu_to_le32(sizeof(struct smb2_create_req) +
2105                                                                 iov[1].iov_len);
2106         le32_add_cpu(&req->CreateContextsLength,
2107                         sizeof(struct create_durable_handle_reconnect_v2));
2108         *num_iovec = num + 1;
2109         return 0;
2110 }
2111
2112 static int
2113 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2114                     struct cifs_open_parms *oparms, bool use_persistent)
2115 {
2116         struct smb2_create_req *req = iov[0].iov_base;
2117         unsigned int num = *num_iovec;
2118
2119         if (use_persistent) {
2120                 if (oparms->reconnect)
2121                         return add_durable_reconnect_v2_context(iov, num_iovec,
2122                                                                 oparms);
2123                 else
2124                         return add_durable_v2_context(iov, num_iovec, oparms);
2125         }
2126
2127         if (oparms->reconnect) {
2128                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2129                 /* indicate that we don't need to relock the file */
2130                 oparms->reconnect = false;
2131         } else
2132                 iov[num].iov_base = create_durable_buf();
2133         if (iov[num].iov_base == NULL)
2134                 return -ENOMEM;
2135         iov[num].iov_len = sizeof(struct create_durable);
2136         if (!req->CreateContextsOffset)
2137                 req->CreateContextsOffset =
2138                         cpu_to_le32(sizeof(struct smb2_create_req) +
2139                                                                 iov[1].iov_len);
2140         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2141         *num_iovec = num + 1;
2142         return 0;
2143 }
2144
2145 /* See MS-SMB2 2.2.13.2.7 */
2146 static struct crt_twarp_ctxt *
2147 create_twarp_buf(__u64 timewarp)
2148 {
2149         struct crt_twarp_ctxt *buf;
2150
2151         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2152         if (!buf)
2153                 return NULL;
2154
2155         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2156                                         (struct crt_twarp_ctxt, Timestamp));
2157         buf->ccontext.DataLength = cpu_to_le32(8);
2158         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2159                                 (struct crt_twarp_ctxt, Name));
2160         buf->ccontext.NameLength = cpu_to_le16(4);
2161         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2162         buf->Name[0] = 'T';
2163         buf->Name[1] = 'W';
2164         buf->Name[2] = 'r';
2165         buf->Name[3] = 'p';
2166         buf->Timestamp = cpu_to_le64(timewarp);
2167         return buf;
2168 }
2169
2170 /* See MS-SMB2 2.2.13.2.7 */
2171 static int
2172 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2173 {
2174         struct smb2_create_req *req = iov[0].iov_base;
2175         unsigned int num = *num_iovec;
2176
2177         iov[num].iov_base = create_twarp_buf(timewarp);
2178         if (iov[num].iov_base == NULL)
2179                 return -ENOMEM;
2180         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2181         if (!req->CreateContextsOffset)
2182                 req->CreateContextsOffset = cpu_to_le32(
2183                                 sizeof(struct smb2_create_req) +
2184                                 iov[num - 1].iov_len);
2185         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2186         *num_iovec = num + 1;
2187         return 0;
2188 }
2189
2190 static struct crt_query_id_ctxt *
2191 create_query_id_buf(void)
2192 {
2193         struct crt_query_id_ctxt *buf;
2194
2195         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2196         if (!buf)
2197                 return NULL;
2198
2199         buf->ccontext.DataOffset = cpu_to_le16(0);
2200         buf->ccontext.DataLength = cpu_to_le32(0);
2201         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2202                                 (struct crt_query_id_ctxt, Name));
2203         buf->ccontext.NameLength = cpu_to_le16(4);
2204         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2205         buf->Name[0] = 'Q';
2206         buf->Name[1] = 'F';
2207         buf->Name[2] = 'i';
2208         buf->Name[3] = 'd';
2209         return buf;
2210 }
2211
2212 /* See MS-SMB2 2.2.13.2.9 */
2213 static int
2214 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2215 {
2216         struct smb2_create_req *req = iov[0].iov_base;
2217         unsigned int num = *num_iovec;
2218
2219         iov[num].iov_base = create_query_id_buf();
2220         if (iov[num].iov_base == NULL)
2221                 return -ENOMEM;
2222         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2223         if (!req->CreateContextsOffset)
2224                 req->CreateContextsOffset = cpu_to_le32(
2225                                 sizeof(struct smb2_create_req) +
2226                                 iov[num - 1].iov_len);
2227         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2228         *num_iovec = num + 1;
2229         return 0;
2230 }
2231
2232 static int
2233 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2234                             const char *treename, const __le16 *path)
2235 {
2236         int treename_len, path_len;
2237         struct nls_table *cp;
2238         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2239
2240         /*
2241          * skip leading "\\"
2242          */
2243         treename_len = strlen(treename);
2244         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2245                 return -EINVAL;
2246
2247         treename += 2;
2248         treename_len -= 2;
2249
2250         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2251
2252         /*
2253          * make room for one path separator between the treename and
2254          * path
2255          */
2256         *out_len = treename_len + 1 + path_len;
2257
2258         /*
2259          * final path needs to be null-terminated UTF16 with a
2260          * size aligned to 8
2261          */
2262
2263         *out_size = roundup((*out_len+1)*2, 8);
2264         *out_path = kzalloc(*out_size, GFP_KERNEL);
2265         if (!*out_path)
2266                 return -ENOMEM;
2267
2268         cp = load_nls_default();
2269         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2270         UniStrcat(*out_path, sep);
2271         UniStrcat(*out_path, path);
2272         unload_nls(cp);
2273
2274         return 0;
2275 }
2276
2277 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2278                                umode_t mode, struct cifs_tcon *tcon,
2279                                const char *full_path,
2280                                struct cifs_sb_info *cifs_sb)
2281 {
2282         struct smb_rqst rqst;
2283         struct smb2_create_req *req;
2284         struct smb2_create_rsp *rsp = NULL;
2285         struct cifs_ses *ses = tcon->ses;
2286         struct kvec iov[3]; /* make sure at least one for each open context */
2287         struct kvec rsp_iov = {NULL, 0};
2288         int resp_buftype;
2289         int uni_path_len;
2290         __le16 *copy_path = NULL;
2291         int copy_size;
2292         int rc = 0;
2293         unsigned int n_iov = 2;
2294         __u32 file_attributes = 0;
2295         char *pc_buf = NULL;
2296         int flags = 0;
2297         unsigned int total_len;
2298         __le16 *utf16_path = NULL;
2299
2300         cifs_dbg(FYI, "mkdir\n");
2301
2302         /* resource #1: path allocation */
2303         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2304         if (!utf16_path)
2305                 return -ENOMEM;
2306
2307         if (!ses || !(ses->server)) {
2308                 rc = -EIO;
2309                 goto err_free_path;
2310         }
2311
2312         /* resource #2: request */
2313         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2314         if (rc)
2315                 goto err_free_path;
2316
2317
2318         if (smb3_encryption_required(tcon))
2319                 flags |= CIFS_TRANSFORM_REQ;
2320
2321         req->ImpersonationLevel = IL_IMPERSONATION;
2322         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2323         /* File attributes ignored on open (used in create though) */
2324         req->FileAttributes = cpu_to_le32(file_attributes);
2325         req->ShareAccess = FILE_SHARE_ALL_LE;
2326         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2327         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2328
2329         iov[0].iov_base = (char *)req;
2330         /* -1 since last byte is buf[0] which is sent below (path) */
2331         iov[0].iov_len = total_len - 1;
2332
2333         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2334
2335         /* [MS-SMB2] 2.2.13 NameOffset:
2336          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2337          * the SMB2 header, the file name includes a prefix that will
2338          * be processed during DFS name normalization as specified in
2339          * section 3.3.5.9. Otherwise, the file name is relative to
2340          * the share that is identified by the TreeId in the SMB2
2341          * header.
2342          */
2343         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2344                 int name_len;
2345
2346                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2347                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2348                                                  &name_len,
2349                                                  tcon->treeName, utf16_path);
2350                 if (rc)
2351                         goto err_free_req;
2352
2353                 req->NameLength = cpu_to_le16(name_len * 2);
2354                 uni_path_len = copy_size;
2355                 /* free before overwriting resource */
2356                 kfree(utf16_path);
2357                 utf16_path = copy_path;
2358         } else {
2359                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2360                 /* MUST set path len (NameLength) to 0 opening root of share */
2361                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2362                 if (uni_path_len % 8 != 0) {
2363                         copy_size = roundup(uni_path_len, 8);
2364                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2365                         if (!copy_path) {
2366                                 rc = -ENOMEM;
2367                                 goto err_free_req;
2368                         }
2369                         memcpy((char *)copy_path, (const char *)utf16_path,
2370                                uni_path_len);
2371                         uni_path_len = copy_size;
2372                         /* free before overwriting resource */
2373                         kfree(utf16_path);
2374                         utf16_path = copy_path;
2375                 }
2376         }
2377
2378         iov[1].iov_len = uni_path_len;
2379         iov[1].iov_base = utf16_path;
2380         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2381
2382         if (tcon->posix_extensions) {
2383                 /* resource #3: posix buf */
2384                 rc = add_posix_context(iov, &n_iov, mode);
2385                 if (rc)
2386                         goto err_free_req;
2387                 pc_buf = iov[n_iov-1].iov_base;
2388         }
2389
2390
2391         memset(&rqst, 0, sizeof(struct smb_rqst));
2392         rqst.rq_iov = iov;
2393         rqst.rq_nvec = n_iov;
2394
2395         /* no need to inc num_remote_opens because we close it just below */
2396         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2397                                     FILE_WRITE_ATTRIBUTES);
2398         /* resource #4: response buffer */
2399         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2400         if (rc) {
2401                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2402                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2403                                            CREATE_NOT_FILE,
2404                                            FILE_WRITE_ATTRIBUTES, rc);
2405                 goto err_free_rsp_buf;
2406         }
2407
2408         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2409         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2410                                     ses->Suid, CREATE_NOT_FILE,
2411                                     FILE_WRITE_ATTRIBUTES);
2412
2413         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2414
2415         /* Eventually save off posix specific response info and timestaps */
2416
2417 err_free_rsp_buf:
2418         free_rsp_buf(resp_buftype, rsp);
2419         kfree(pc_buf);
2420 err_free_req:
2421         cifs_small_buf_release(req);
2422 err_free_path:
2423         kfree(utf16_path);
2424         return rc;
2425 }
2426
2427 int
2428 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2429                struct cifs_open_parms *oparms, __le16 *path)
2430 {
2431         struct TCP_Server_Info *server = tcon->ses->server;
2432         struct smb2_create_req *req;
2433         unsigned int n_iov = 2;
2434         __u32 file_attributes = 0;
2435         int copy_size;
2436         int uni_path_len;
2437         unsigned int total_len;
2438         struct kvec *iov = rqst->rq_iov;
2439         __le16 *copy_path;
2440         int rc;
2441
2442         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2443         if (rc)
2444                 return rc;
2445
2446         iov[0].iov_base = (char *)req;
2447         /* -1 since last byte is buf[0] which is sent below (path) */
2448         iov[0].iov_len = total_len - 1;
2449
2450         if (oparms->create_options & CREATE_OPTION_READONLY)
2451                 file_attributes |= ATTR_READONLY;
2452         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2453                 file_attributes |= ATTR_SYSTEM;
2454
2455         req->ImpersonationLevel = IL_IMPERSONATION;
2456         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2457         /* File attributes ignored on open (used in create though) */
2458         req->FileAttributes = cpu_to_le32(file_attributes);
2459         req->ShareAccess = FILE_SHARE_ALL_LE;
2460
2461         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2462         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2463         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2464
2465         /* [MS-SMB2] 2.2.13 NameOffset:
2466          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2467          * the SMB2 header, the file name includes a prefix that will
2468          * be processed during DFS name normalization as specified in
2469          * section 3.3.5.9. Otherwise, the file name is relative to
2470          * the share that is identified by the TreeId in the SMB2
2471          * header.
2472          */
2473         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2474                 int name_len;
2475
2476                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2477                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2478                                                  &name_len,
2479                                                  tcon->treeName, path);
2480                 if (rc)
2481                         return rc;
2482                 req->NameLength = cpu_to_le16(name_len * 2);
2483                 uni_path_len = copy_size;
2484                 path = copy_path;
2485         } else {
2486                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2487                 /* MUST set path len (NameLength) to 0 opening root of share */
2488                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2489                 copy_size = uni_path_len;
2490                 if (copy_size % 8 != 0)
2491                         copy_size = roundup(copy_size, 8);
2492                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2493                 if (!copy_path)
2494                         return -ENOMEM;
2495                 memcpy((char *)copy_path, (const char *)path,
2496                        uni_path_len);
2497                 uni_path_len = copy_size;
2498                 path = copy_path;
2499         }
2500
2501         iov[1].iov_len = uni_path_len;
2502         iov[1].iov_base = path;
2503
2504         if ((!server->oplocks) || (tcon->no_lease))
2505                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2506
2507         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2508             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2509                 req->RequestedOplockLevel = *oplock;
2510         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2511                   (oparms->create_options & CREATE_NOT_FILE))
2512                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2513         else {
2514                 rc = add_lease_context(server, iov, &n_iov,
2515                                        oparms->fid->lease_key, oplock);
2516                 if (rc)
2517                         return rc;
2518         }
2519
2520         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2521                 /* need to set Next field of lease context if we request it */
2522                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2523                         struct create_context *ccontext =
2524                             (struct create_context *)iov[n_iov-1].iov_base;
2525                         ccontext->Next =
2526                                 cpu_to_le32(server->vals->create_lease_size);
2527                 }
2528
2529                 rc = add_durable_context(iov, &n_iov, oparms,
2530                                         tcon->use_persistent);
2531                 if (rc)
2532                         return rc;
2533         }
2534
2535         if (tcon->posix_extensions) {
2536                 if (n_iov > 2) {
2537                         struct create_context *ccontext =
2538                             (struct create_context *)iov[n_iov-1].iov_base;
2539                         ccontext->Next =
2540                                 cpu_to_le32(iov[n_iov-1].iov_len);
2541                 }
2542
2543                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2544                 if (rc)
2545                         return rc;
2546         }
2547
2548         if (tcon->snapshot_time) {
2549                 cifs_dbg(FYI, "adding snapshot context\n");
2550                 if (n_iov > 2) {
2551                         struct create_context *ccontext =
2552                             (struct create_context *)iov[n_iov-1].iov_base;
2553                         ccontext->Next =
2554                                 cpu_to_le32(iov[n_iov-1].iov_len);
2555                 }
2556
2557                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2558                 if (rc)
2559                         return rc;
2560         }
2561
2562         if ((oparms->disposition == FILE_CREATE) &&
2563             (oparms->mode != ACL_NO_MODE)) {
2564                 if (n_iov > 2) {
2565                         struct create_context *ccontext =
2566                             (struct create_context *)iov[n_iov-1].iov_base;
2567                         ccontext->Next =
2568                                 cpu_to_le32(iov[n_iov-1].iov_len);
2569                 }
2570
2571                 /* rc = add_sd_context(iov, &n_iov, oparms->mode); */
2572                 if (rc)
2573                         return rc;
2574         }
2575
2576         if (n_iov > 2) {
2577                 struct create_context *ccontext =
2578                         (struct create_context *)iov[n_iov-1].iov_base;
2579                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2580         }
2581         add_query_id_context(iov, &n_iov);
2582
2583         rqst->rq_nvec = n_iov;
2584         return 0;
2585 }
2586
2587 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2588  * All other vectors are freed by kfree().
2589  */
2590 void
2591 SMB2_open_free(struct smb_rqst *rqst)
2592 {
2593         int i;
2594
2595         if (rqst && rqst->rq_iov) {
2596                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2597                 for (i = 1; i < rqst->rq_nvec; i++)
2598                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2599                                 kfree(rqst->rq_iov[i].iov_base);
2600         }
2601 }
2602
2603 int
2604 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2605           __u8 *oplock, struct smb2_file_all_info *buf,
2606           struct kvec *err_iov, int *buftype)
2607 {
2608         struct smb_rqst rqst;
2609         struct smb2_create_rsp *rsp = NULL;
2610         struct TCP_Server_Info *server;
2611         struct cifs_tcon *tcon = oparms->tcon;
2612         struct cifs_ses *ses = tcon->ses;
2613         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2614         struct kvec rsp_iov = {NULL, 0};
2615         int resp_buftype = CIFS_NO_BUFFER;
2616         int rc = 0;
2617         int flags = 0;
2618
2619         cifs_dbg(FYI, "create/open\n");
2620         if (ses && (ses->server))
2621                 server = ses->server;
2622         else
2623                 return -EIO;
2624
2625         if (smb3_encryption_required(tcon))
2626                 flags |= CIFS_TRANSFORM_REQ;
2627
2628         memset(&rqst, 0, sizeof(struct smb_rqst));
2629         memset(&iov, 0, sizeof(iov));
2630         rqst.rq_iov = iov;
2631         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2632
2633         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2634         if (rc)
2635                 goto creat_exit;
2636
2637         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2638                 oparms->create_options, oparms->desired_access);
2639
2640         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2641                             &rsp_iov);
2642         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2643
2644         if (rc != 0) {
2645                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2646                 if (err_iov && rsp) {
2647                         *err_iov = rsp_iov;
2648                         *buftype = resp_buftype;
2649                         resp_buftype = CIFS_NO_BUFFER;
2650                         rsp = NULL;
2651                 }
2652                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2653                                     oparms->create_options, oparms->desired_access, rc);
2654                 if (rc == -EREMCHG) {
2655                         printk_once(KERN_WARNING "server share %s deleted\n",
2656                                     tcon->treeName);
2657                         tcon->need_reconnect = true;
2658                 }
2659                 goto creat_exit;
2660         } else
2661                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2662                                      ses->Suid, oparms->create_options,
2663                                      oparms->desired_access);
2664
2665         atomic_inc(&tcon->num_remote_opens);
2666         oparms->fid->persistent_fid = rsp->PersistentFileId;
2667         oparms->fid->volatile_fid = rsp->VolatileFileId;
2668         oparms->fid->access = oparms->desired_access;
2669 #ifdef CONFIG_CIFS_DEBUG2
2670         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2671 #endif /* CIFS_DEBUG2 */
2672
2673         if (buf) {
2674                 memcpy(buf, &rsp->CreationTime, 32);
2675                 buf->AllocationSize = rsp->AllocationSize;
2676                 buf->EndOfFile = rsp->EndofFile;
2677                 buf->Attributes = rsp->FileAttributes;
2678                 buf->NumberOfLinks = cpu_to_le32(1);
2679                 buf->DeletePending = 0;
2680         }
2681
2682
2683         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2684                             oparms->fid->lease_key, oplock, buf);
2685 creat_exit:
2686         SMB2_open_free(&rqst);
2687         free_rsp_buf(resp_buftype, rsp);
2688         return rc;
2689 }
2690
2691 int
2692 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2693                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2694                 bool is_fsctl, char *in_data, u32 indatalen,
2695                 __u32 max_response_size)
2696 {
2697         struct smb2_ioctl_req *req;
2698         struct kvec *iov = rqst->rq_iov;
2699         unsigned int total_len;
2700         int rc;
2701         char *in_data_buf;
2702
2703         rc = smb2_ioctl_req_init(opcode, tcon, (void **) &req, &total_len);
2704         if (rc)
2705                 return rc;
2706
2707         if (indatalen) {
2708                 /*
2709                  * indatalen is usually small at a couple of bytes max, so
2710                  * just allocate through generic pool
2711                  */
2712                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2713                 if (!in_data_buf) {
2714                         cifs_small_buf_release(req);
2715                         return -ENOMEM;
2716                 }
2717         }
2718
2719         req->CtlCode = cpu_to_le32(opcode);
2720         req->PersistentFileId = persistent_fid;
2721         req->VolatileFileId = volatile_fid;
2722
2723         iov[0].iov_base = (char *)req;
2724         /*
2725          * If no input data, the size of ioctl struct in
2726          * protocol spec still includes a 1 byte data buffer,
2727          * but if input data passed to ioctl, we do not
2728          * want to double count this, so we do not send
2729          * the dummy one byte of data in iovec[0] if sending
2730          * input data (in iovec[1]).
2731          */
2732         if (indatalen) {
2733                 req->InputCount = cpu_to_le32(indatalen);
2734                 /* do not set InputOffset if no input data */
2735                 req->InputOffset =
2736                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2737                 rqst->rq_nvec = 2;
2738                 iov[0].iov_len = total_len - 1;
2739                 iov[1].iov_base = in_data_buf;
2740                 iov[1].iov_len = indatalen;
2741         } else {
2742                 rqst->rq_nvec = 1;
2743                 iov[0].iov_len = total_len;
2744         }
2745
2746         req->OutputOffset = 0;
2747         req->OutputCount = 0; /* MBZ */
2748
2749         /*
2750          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2751          * We Could increase default MaxOutputResponse, but that could require
2752          * more credits. Windows typically sets this smaller, but for some
2753          * ioctls it may be useful to allow server to send more. No point
2754          * limiting what the server can send as long as fits in one credit
2755          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2756          * to increase this limit up in the future.
2757          * Note that for snapshot queries that servers like Azure expect that
2758          * the first query be minimal size (and just used to get the number/size
2759          * of previous versions) so response size must be specified as EXACTLY
2760          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2761          * of eight bytes.  Currently that is the only case where we set max
2762          * response size smaller.
2763          */
2764         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2765         req->sync_hdr.CreditCharge =
2766                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2767                                          SMB2_MAX_BUFFER_SIZE));
2768         if (is_fsctl)
2769                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2770         else
2771                 req->Flags = 0;
2772
2773         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2774         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2775                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2776
2777         return 0;
2778 }
2779
2780 void
2781 SMB2_ioctl_free(struct smb_rqst *rqst)
2782 {
2783         int i;
2784         if (rqst && rqst->rq_iov) {
2785                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2786                 for (i = 1; i < rqst->rq_nvec; i++)
2787                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2788                                 kfree(rqst->rq_iov[i].iov_base);
2789         }
2790 }
2791
2792
2793 /*
2794  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2795  */
2796 int
2797 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2798            u64 volatile_fid, u32 opcode, bool is_fsctl,
2799            char *in_data, u32 indatalen, u32 max_out_data_len,
2800            char **out_data, u32 *plen /* returned data len */)
2801 {
2802         struct smb_rqst rqst;
2803         struct smb2_ioctl_rsp *rsp = NULL;
2804         struct cifs_ses *ses;
2805         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2806         struct kvec rsp_iov = {NULL, 0};
2807         int resp_buftype = CIFS_NO_BUFFER;
2808         int rc = 0;
2809         int flags = 0;
2810         struct TCP_Server_Info *server;
2811
2812         cifs_dbg(FYI, "SMB2 IOCTL\n");
2813
2814         if (out_data != NULL)
2815                 *out_data = NULL;
2816
2817         /* zero out returned data len, in case of error */
2818         if (plen)
2819                 *plen = 0;
2820
2821         if (tcon)
2822                 ses = tcon->ses;
2823         else
2824                 return -EIO;
2825
2826         if (!ses)
2827                 return -EIO;
2828         server = ses->server;
2829         if (!server)
2830                 return -EIO;
2831
2832         if (smb3_encryption_required(tcon))
2833                 flags |= CIFS_TRANSFORM_REQ;
2834
2835         memset(&rqst, 0, sizeof(struct smb_rqst));
2836         memset(&iov, 0, sizeof(iov));
2837         rqst.rq_iov = iov;
2838         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2839
2840         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2841                              is_fsctl, in_data, indatalen, max_out_data_len);
2842         if (rc)
2843                 goto ioctl_exit;
2844
2845         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2846                             &rsp_iov);
2847         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2848
2849         if (rc != 0)
2850                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2851                                 ses->Suid, 0, opcode, rc);
2852
2853         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2854                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2855                 goto ioctl_exit;
2856         } else if (rc == -EINVAL) {
2857                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2858                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2859                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2860                         goto ioctl_exit;
2861                 }
2862         } else if (rc == -E2BIG) {
2863                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2864                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2865                         goto ioctl_exit;
2866                 }
2867         }
2868
2869         /* check if caller wants to look at return data or just return rc */
2870         if ((plen == NULL) || (out_data == NULL))
2871                 goto ioctl_exit;
2872
2873         *plen = le32_to_cpu(rsp->OutputCount);
2874
2875         /* We check for obvious errors in the output buffer length and offset */
2876         if (*plen == 0)
2877                 goto ioctl_exit; /* server returned no data */
2878         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2879                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2880                 *plen = 0;
2881                 rc = -EIO;
2882                 goto ioctl_exit;
2883         }
2884
2885         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2886                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2887                         le32_to_cpu(rsp->OutputOffset));
2888                 *plen = 0;
2889                 rc = -EIO;
2890                 goto ioctl_exit;
2891         }
2892
2893         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2894                             *plen, GFP_KERNEL);
2895         if (*out_data == NULL) {
2896                 rc = -ENOMEM;
2897                 goto ioctl_exit;
2898         }
2899
2900 ioctl_exit:
2901         SMB2_ioctl_free(&rqst);
2902         free_rsp_buf(resp_buftype, rsp);
2903         return rc;
2904 }
2905
2906 /*
2907  *   Individual callers to ioctl worker function follow
2908  */
2909
2910 int
2911 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2912                      u64 persistent_fid, u64 volatile_fid)
2913 {
2914         int rc;
2915         struct  compress_ioctl fsctl_input;
2916         char *ret_data = NULL;
2917
2918         fsctl_input.CompressionState =
2919                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2920
2921         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2922                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2923                         (char *)&fsctl_input /* data input */,
2924                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2925                         &ret_data /* out data */, NULL);
2926
2927         cifs_dbg(FYI, "set compression rc %d\n", rc);
2928
2929         return rc;
2930 }
2931
2932 int
2933 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2934                 u64 persistent_fid, u64 volatile_fid)
2935 {
2936         struct smb2_close_req *req;
2937         struct kvec *iov = rqst->rq_iov;
2938         unsigned int total_len;
2939         int rc;
2940
2941         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2942         if (rc)
2943                 return rc;
2944
2945         req->PersistentFileId = persistent_fid;
2946         req->VolatileFileId = volatile_fid;
2947         iov[0].iov_base = (char *)req;
2948         iov[0].iov_len = total_len;
2949
2950         return 0;
2951 }
2952
2953 void
2954 SMB2_close_free(struct smb_rqst *rqst)
2955 {
2956         if (rqst && rqst->rq_iov)
2957                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2958 }
2959
2960 int
2961 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2962                  u64 persistent_fid, u64 volatile_fid)
2963 {
2964         struct smb_rqst rqst;
2965         struct smb2_close_rsp *rsp = NULL;
2966         struct cifs_ses *ses = tcon->ses;
2967         struct kvec iov[1];
2968         struct kvec rsp_iov;
2969         int resp_buftype = CIFS_NO_BUFFER;
2970         int rc = 0;
2971         int flags = 0;
2972
2973         cifs_dbg(FYI, "Close\n");
2974
2975         if (!ses || !(ses->server))
2976                 return -EIO;
2977
2978         if (smb3_encryption_required(tcon))
2979                 flags |= CIFS_TRANSFORM_REQ;
2980
2981         memset(&rqst, 0, sizeof(struct smb_rqst));
2982         memset(&iov, 0, sizeof(iov));
2983         rqst.rq_iov = iov;
2984         rqst.rq_nvec = 1;
2985
2986         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
2987         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2988         if (rc)
2989                 goto close_exit;
2990
2991         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2992         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2993
2994         if (rc != 0) {
2995                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2996                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2997                                      rc);
2998                 goto close_exit;
2999         } else
3000                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3001                                       ses->Suid);
3002
3003         atomic_dec(&tcon->num_remote_opens);
3004
3005         /* BB FIXME - decode close response, update inode for caching */
3006
3007 close_exit:
3008         SMB2_close_free(&rqst);
3009         free_rsp_buf(resp_buftype, rsp);
3010
3011         /* retry close in a worker thread if this one is interrupted */
3012         if (is_interrupt_error(rc)) {
3013                 int tmp_rc;
3014
3015                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3016                                                      volatile_fid);
3017                 if (tmp_rc)
3018                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3019                                  persistent_fid, tmp_rc);
3020         }
3021         return rc;
3022 }
3023
3024 int
3025 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3026                   struct kvec *iov, unsigned int min_buf_size)
3027 {
3028         unsigned int smb_len = iov->iov_len;
3029         char *end_of_smb = smb_len + (char *)iov->iov_base;
3030         char *begin_of_buf = offset + (char *)iov->iov_base;
3031         char *end_of_buf = begin_of_buf + buffer_length;
3032
3033
3034         if (buffer_length < min_buf_size) {
3035                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3036                          buffer_length, min_buf_size);
3037                 return -EINVAL;
3038         }
3039
3040         /* check if beyond RFC1001 maximum length */
3041         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3042                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3043                          buffer_length, smb_len);
3044                 return -EINVAL;
3045         }
3046
3047         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3048                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
3049                 return -EINVAL;
3050         }
3051
3052         return 0;
3053 }
3054
3055 /*
3056  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3057  * Caller must free buffer.
3058  */
3059 int
3060 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3061                            struct kvec *iov, unsigned int minbufsize,
3062                            char *data)
3063 {
3064         char *begin_of_buf = offset + (char *)iov->iov_base;
3065         int rc;
3066
3067         if (!data)
3068                 return -EINVAL;
3069
3070         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3071         if (rc)
3072                 return rc;
3073
3074         memcpy(data, begin_of_buf, buffer_length);
3075
3076         return 0;
3077 }
3078
3079 int
3080 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3081                      u64 persistent_fid, u64 volatile_fid,
3082                      u8 info_class, u8 info_type, u32 additional_info,
3083                      size_t output_len, size_t input_len, void *input)
3084 {
3085         struct smb2_query_info_req *req;
3086         struct kvec *iov = rqst->rq_iov;
3087         unsigned int total_len;
3088         int rc;
3089
3090         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3091                              &total_len);
3092         if (rc)
3093                 return rc;
3094
3095         req->InfoType = info_type;
3096         req->FileInfoClass = info_class;
3097         req->PersistentFileId = persistent_fid;
3098         req->VolatileFileId = volatile_fid;
3099         req->AdditionalInformation = cpu_to_le32(additional_info);
3100
3101         req->OutputBufferLength = cpu_to_le32(output_len);
3102         if (input_len) {
3103                 req->InputBufferLength = cpu_to_le32(input_len);
3104                 /* total_len for smb query request never close to le16 max */
3105                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3106                 memcpy(req->Buffer, input, input_len);
3107         }
3108
3109         iov[0].iov_base = (char *)req;
3110         /* 1 for Buffer */
3111         iov[0].iov_len = total_len - 1 + input_len;
3112         return 0;
3113 }
3114
3115 void
3116 SMB2_query_info_free(struct smb_rqst *rqst)
3117 {
3118         if (rqst && rqst->rq_iov)
3119                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3120 }
3121
3122 static int
3123 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3124            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3125            u32 additional_info, size_t output_len, size_t min_len, void **data,
3126                 u32 *dlen)
3127 {
3128         struct smb_rqst rqst;
3129         struct smb2_query_info_rsp *rsp = NULL;
3130         struct kvec iov[1];
3131         struct kvec rsp_iov;
3132         int rc = 0;
3133         int resp_buftype = CIFS_NO_BUFFER;
3134         struct cifs_ses *ses = tcon->ses;
3135         struct TCP_Server_Info *server;
3136         int flags = 0;
3137         bool allocated = false;
3138
3139         cifs_dbg(FYI, "Query Info\n");
3140
3141         if (!ses)
3142                 return -EIO;
3143         server = ses->server;
3144         if (!server)
3145                 return -EIO;
3146
3147         if (smb3_encryption_required(tcon))
3148                 flags |= CIFS_TRANSFORM_REQ;
3149
3150         memset(&rqst, 0, sizeof(struct smb_rqst));
3151         memset(&iov, 0, sizeof(iov));
3152         rqst.rq_iov = iov;
3153         rqst.rq_nvec = 1;
3154
3155         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
3156                                   info_class, info_type, additional_info,
3157                                   output_len, 0, NULL);
3158         if (rc)
3159                 goto qinf_exit;
3160
3161         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3162                                     ses->Suid, info_class, (__u32)info_type);
3163
3164         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3165         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3166
3167         if (rc) {
3168                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3169                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3170                                 ses->Suid, info_class, (__u32)info_type, rc);
3171                 goto qinf_exit;
3172         }
3173
3174         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3175                                 ses->Suid, info_class, (__u32)info_type);
3176
3177         if (dlen) {
3178                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3179                 if (!*data) {
3180                         *data = kmalloc(*dlen, GFP_KERNEL);
3181                         if (!*data) {
3182                                 cifs_tcon_dbg(VFS,
3183                                         "Error %d allocating memory for acl\n",
3184                                         rc);
3185                                 *dlen = 0;
3186                                 rc = -ENOMEM;
3187                                 goto qinf_exit;
3188                         }
3189                         allocated = true;
3190                 }
3191         }
3192
3193         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3194                                         le32_to_cpu(rsp->OutputBufferLength),
3195                                         &rsp_iov, min_len, *data);
3196         if (rc && allocated) {
3197                 kfree(*data);
3198                 *data = NULL;
3199                 *dlen = 0;
3200         }
3201
3202 qinf_exit:
3203         SMB2_query_info_free(&rqst);
3204         free_rsp_buf(resp_buftype, rsp);
3205         return rc;
3206 }
3207
3208 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3209         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3210 {
3211         return query_info(xid, tcon, persistent_fid, volatile_fid,
3212                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3213                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3214                           sizeof(struct smb2_file_all_info), (void **)&data,
3215                           NULL);
3216 }
3217
3218 int
3219 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3220                 u64 persistent_fid, u64 volatile_fid,
3221                 void **data, u32 *plen)
3222 {
3223         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3224         *plen = 0;
3225
3226         return query_info(xid, tcon, persistent_fid, volatile_fid,
3227                           0, SMB2_O_INFO_SECURITY, additional_info,
3228                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3229 }
3230
3231 int
3232 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3233                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3234 {
3235         return query_info(xid, tcon, persistent_fid, volatile_fid,
3236                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3237                           sizeof(struct smb2_file_internal_info),
3238                           sizeof(struct smb2_file_internal_info),
3239                           (void **)&uniqueid, NULL);
3240 }
3241
3242 /*
3243  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3244  * See MS-SMB2 2.2.35 and 2.2.36
3245  */
3246
3247 static int
3248 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3249                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid,
3250                 u32 completion_filter, bool watch_tree)
3251 {
3252         struct smb2_change_notify_req *req;
3253         struct kvec *iov = rqst->rq_iov;
3254         unsigned int total_len;
3255         int rc;
3256
3257         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len);
3258         if (rc)
3259                 return rc;
3260
3261         req->PersistentFileId = persistent_fid;
3262         req->VolatileFileId = volatile_fid;
3263         req->OutputBufferLength =
3264                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3265         req->CompletionFilter = cpu_to_le32(completion_filter);
3266         if (watch_tree)
3267                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3268         else
3269                 req->Flags = 0;
3270
3271         iov[0].iov_base = (char *)req;
3272         iov[0].iov_len = total_len;
3273
3274         return 0;
3275 }
3276
3277 int
3278 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3279                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3280                 u32 completion_filter)
3281 {
3282         struct cifs_ses *ses = tcon->ses;
3283         struct smb_rqst rqst;
3284         struct kvec iov[1];
3285         struct kvec rsp_iov = {NULL, 0};
3286         int resp_buftype = CIFS_NO_BUFFER;
3287         int flags = 0;
3288         int rc = 0;
3289
3290         cifs_dbg(FYI, "change notify\n");
3291         if (!ses || !(ses->server))
3292                 return -EIO;
3293
3294         if (smb3_encryption_required(tcon))
3295                 flags |= CIFS_TRANSFORM_REQ;
3296
3297         memset(&rqst, 0, sizeof(struct smb_rqst));
3298         memset(&iov, 0, sizeof(iov));
3299         rqst.rq_iov = iov;
3300         rqst.rq_nvec = 1;
3301
3302         rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid,
3303                               completion_filter, watch_tree);
3304         if (rc)
3305                 goto cnotify_exit;
3306
3307         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3308                                 (u8)watch_tree, completion_filter);
3309         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3310
3311         if (rc != 0) {
3312                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3313                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3314                                 (u8)watch_tree, completion_filter, rc);
3315         } else
3316                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3317                                 ses->Suid, (u8)watch_tree, completion_filter);
3318
3319  cnotify_exit:
3320         if (rqst.rq_iov)
3321                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3322         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3323         return rc;
3324 }
3325
3326
3327
3328 /*
3329  * This is a no-op for now. We're not really interested in the reply, but
3330  * rather in the fact that the server sent one and that server->lstrp
3331  * gets updated.
3332  *
3333  * FIXME: maybe we should consider checking that the reply matches request?
3334  */
3335 static void
3336 smb2_echo_callback(struct mid_q_entry *mid)
3337 {
3338         struct TCP_Server_Info *server = mid->callback_data;
3339         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3340         struct cifs_credits credits = { .value = 0, .instance = 0 };
3341
3342         if (mid->mid_state == MID_RESPONSE_RECEIVED
3343             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3344                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3345                 credits.instance = server->reconnect_instance;
3346         }
3347
3348         DeleteMidQEntry(mid);
3349         add_credits(server, &credits, CIFS_ECHO_OP);
3350 }
3351
3352 void smb2_reconnect_server(struct work_struct *work)
3353 {
3354         struct TCP_Server_Info *server = container_of(work,
3355                                         struct TCP_Server_Info, reconnect.work);
3356         struct cifs_ses *ses;
3357         struct cifs_tcon *tcon, *tcon2;
3358         struct list_head tmp_list;
3359         int tcon_exist = false;
3360         int rc;
3361         int resched = false;
3362
3363
3364         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3365         mutex_lock(&server->reconnect_mutex);
3366
3367         INIT_LIST_HEAD(&tmp_list);
3368         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3369
3370         spin_lock(&cifs_tcp_ses_lock);
3371         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3372                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3373                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3374                                 tcon->tc_count++;
3375                                 list_add_tail(&tcon->rlist, &tmp_list);
3376                                 tcon_exist = true;
3377                         }
3378                 }
3379                 /*
3380                  * IPC has the same lifetime as its session and uses its
3381                  * refcount.
3382                  */
3383                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3384                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3385                         tcon_exist = true;
3386                         ses->ses_count++;
3387                 }
3388         }
3389         /*
3390          * Get the reference to server struct to be sure that the last call of
3391          * cifs_put_tcon() in the loop below won't release the server pointer.
3392          */
3393         if (tcon_exist)
3394                 server->srv_count++;
3395
3396         spin_unlock(&cifs_tcp_ses_lock);
3397
3398         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3399                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3400                 if (!rc)
3401                         cifs_reopen_persistent_handles(tcon);
3402                 else
3403                         resched = true;
3404                 list_del_init(&tcon->rlist);
3405                 if (tcon->ipc)
3406                         cifs_put_smb_ses(tcon->ses);
3407                 else
3408                         cifs_put_tcon(tcon);
3409         }
3410
3411         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3412         if (resched)
3413                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3414         mutex_unlock(&server->reconnect_mutex);
3415
3416         /* now we can safely release srv struct */
3417         if (tcon_exist)
3418                 cifs_put_tcp_session(server, 1);
3419 }
3420
3421 int
3422 SMB2_echo(struct TCP_Server_Info *server)
3423 {
3424         struct smb2_echo_req *req;
3425         int rc = 0;
3426         struct kvec iov[1];
3427         struct smb_rqst rqst = { .rq_iov = iov,
3428                                  .rq_nvec = 1 };
3429         unsigned int total_len;
3430
3431         cifs_dbg(FYI, "In echo request\n");
3432
3433         if (server->tcpStatus == CifsNeedNegotiate) {
3434                 /* No need to send echo on newly established connections */
3435                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3436                 return rc;
3437         }
3438
3439         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3440         if (rc)
3441                 return rc;
3442
3443         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3444
3445         iov[0].iov_len = total_len;
3446         iov[0].iov_base = (char *)req;
3447
3448         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3449                              server, CIFS_ECHO_OP, NULL);
3450         if (rc)
3451                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3452
3453         cifs_small_buf_release(req);
3454         return rc;
3455 }
3456
3457 void
3458 SMB2_flush_free(struct smb_rqst *rqst)
3459 {
3460         if (rqst && rqst->rq_iov)
3461                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3462 }
3463
3464 int
3465 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3466                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
3467 {
3468         struct smb2_flush_req *req;
3469         struct kvec *iov = rqst->rq_iov;
3470         unsigned int total_len;
3471         int rc;
3472
3473         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3474         if (rc)
3475                 return rc;
3476
3477         req->PersistentFileId = persistent_fid;
3478         req->VolatileFileId = volatile_fid;
3479
3480         iov[0].iov_base = (char *)req;
3481         iov[0].iov_len = total_len;
3482
3483         return 0;
3484 }
3485
3486 int
3487 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3488            u64 volatile_fid)
3489 {
3490         struct cifs_ses *ses = tcon->ses;
3491         struct smb_rqst rqst;
3492         struct kvec iov[1];
3493         struct kvec rsp_iov = {NULL, 0};
3494         int resp_buftype = CIFS_NO_BUFFER;
3495         int flags = 0;
3496         int rc = 0;
3497
3498         cifs_dbg(FYI, "flush\n");
3499         if (!ses || !(ses->server))
3500                 return -EIO;
3501
3502         if (smb3_encryption_required(tcon))
3503                 flags |= CIFS_TRANSFORM_REQ;
3504
3505         memset(&rqst, 0, sizeof(struct smb_rqst));
3506         memset(&iov, 0, sizeof(iov));
3507         rqst.rq_iov = iov;
3508         rqst.rq_nvec = 1;
3509
3510         rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
3511         if (rc)
3512                 goto flush_exit;
3513
3514         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3515         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3516
3517         if (rc != 0) {
3518                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3519                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3520                                      rc);
3521         } else
3522                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3523                                       ses->Suid);
3524
3525  flush_exit:
3526         SMB2_flush_free(&rqst);
3527         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3528         return rc;
3529 }
3530
3531 /*
3532  * To form a chain of read requests, any read requests after the first should
3533  * have the end_of_chain boolean set to true.
3534  */
3535 static int
3536 smb2_new_read_req(void **buf, unsigned int *total_len,
3537         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3538         unsigned int remaining_bytes, int request_type)
3539 {
3540         int rc = -EACCES;
3541         struct smb2_read_plain_req *req = NULL;
3542         struct smb2_sync_hdr *shdr;
3543         struct TCP_Server_Info *server;
3544
3545         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3546                                  total_len);
3547         if (rc)
3548                 return rc;
3549
3550         server = io_parms->tcon->ses->server;
3551         if (server == NULL)
3552                 return -ECONNABORTED;
3553
3554         shdr = &req->sync_hdr;
3555         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3556
3557         req->PersistentFileId = io_parms->persistent_fid;
3558         req->VolatileFileId = io_parms->volatile_fid;
3559         req->ReadChannelInfoOffset = 0; /* reserved */
3560         req->ReadChannelInfoLength = 0; /* reserved */
3561         req->Channel = 0; /* reserved */
3562         req->MinimumCount = 0;
3563         req->Length = cpu_to_le32(io_parms->length);
3564         req->Offset = cpu_to_le64(io_parms->offset);
3565
3566         trace_smb3_read_enter(0 /* xid */,
3567                         io_parms->persistent_fid,
3568                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3569                         io_parms->offset, io_parms->length);
3570 #ifdef CONFIG_CIFS_SMB_DIRECT
3571         /*
3572          * If we want to do a RDMA write, fill in and append
3573          * smbd_buffer_descriptor_v1 to the end of read request
3574          */
3575         if (server->rdma && rdata && !server->sign &&
3576                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3577
3578                 struct smbd_buffer_descriptor_v1 *v1;
3579                 bool need_invalidate =
3580                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3581
3582                 rdata->mr = smbd_register_mr(
3583                                 server->smbd_conn, rdata->pages,
3584                                 rdata->nr_pages, rdata->page_offset,
3585                                 rdata->tailsz, true, need_invalidate);
3586                 if (!rdata->mr)
3587                         return -EAGAIN;
3588
3589                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3590                 if (need_invalidate)
3591                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3592                 req->ReadChannelInfoOffset =
3593                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3594                 req->ReadChannelInfoLength =
3595                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3596                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3597                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3598                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3599                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3600
3601                 *total_len += sizeof(*v1) - 1;
3602         }
3603 #endif
3604         if (request_type & CHAINED_REQUEST) {
3605                 if (!(request_type & END_OF_CHAIN)) {
3606                         /* next 8-byte aligned request */
3607                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3608                         shdr->NextCommand = cpu_to_le32(*total_len);
3609                 } else /* END_OF_CHAIN */
3610                         shdr->NextCommand = 0;
3611                 if (request_type & RELATED_REQUEST) {
3612                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3613                         /*
3614                          * Related requests use info from previous read request
3615                          * in chain.
3616                          */
3617                         shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3618                         shdr->TreeId = 0xFFFFFFFF;
3619                         req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3620                         req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3621                 }
3622         }
3623         if (remaining_bytes > io_parms->length)
3624                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3625         else
3626                 req->RemainingBytes = 0;
3627
3628         *buf = req;
3629         return rc;
3630 }
3631
3632 static void
3633 smb2_readv_callback(struct mid_q_entry *mid)
3634 {
3635         struct cifs_readdata *rdata = mid->callback_data;
3636         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3637         struct TCP_Server_Info *server = tcon->ses->server;
3638         struct smb2_sync_hdr *shdr =
3639                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3640         struct cifs_credits credits = { .value = 0, .instance = 0 };
3641         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3642                                  .rq_nvec = 1, };
3643
3644         if (rdata->got_bytes) {
3645                 rqst.rq_pages = rdata->pages;
3646                 rqst.rq_offset = rdata->page_offset;
3647                 rqst.rq_npages = rdata->nr_pages;
3648                 rqst.rq_pagesz = rdata->pagesz;
3649                 rqst.rq_tailsz = rdata->tailsz;
3650         }
3651
3652         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3653                  __func__, mid->mid, mid->mid_state, rdata->result,
3654                  rdata->bytes);
3655
3656         switch (mid->mid_state) {
3657         case MID_RESPONSE_RECEIVED:
3658                 credits.value = le16_to_cpu(shdr->CreditRequest);
3659                 credits.instance = server->reconnect_instance;
3660                 /* result already set, check signature */
3661                 if (server->sign && !mid->decrypted) {
3662                         int rc;
3663
3664                         rc = smb2_verify_signature(&rqst, server);
3665                         if (rc)
3666                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3667                                          rc);
3668                 }
3669                 /* FIXME: should this be counted toward the initiating task? */
3670                 task_io_account_read(rdata->got_bytes);
3671                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3672                 break;
3673         case MID_REQUEST_SUBMITTED:
3674         case MID_RETRY_NEEDED:
3675                 rdata->result = -EAGAIN;
3676                 if (server->sign && rdata->got_bytes)
3677                         /* reset bytes number since we can not check a sign */
3678                         rdata->got_bytes = 0;
3679                 /* FIXME: should this be counted toward the initiating task? */
3680                 task_io_account_read(rdata->got_bytes);
3681                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3682                 break;
3683         case MID_RESPONSE_MALFORMED:
3684                 credits.value = le16_to_cpu(shdr->CreditRequest);
3685                 credits.instance = server->reconnect_instance;
3686                 /* fall through */
3687         default:
3688                 rdata->result = -EIO;
3689         }
3690 #ifdef CONFIG_CIFS_SMB_DIRECT
3691         /*
3692          * If this rdata has a memmory registered, the MR can be freed
3693          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3694          * because they have limited number and are used for future I/Os
3695          */
3696         if (rdata->mr) {
3697                 smbd_deregister_mr(rdata->mr);
3698                 rdata->mr = NULL;
3699         }
3700 #endif
3701         if (rdata->result && rdata->result != -ENODATA) {
3702                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3703                 trace_smb3_read_err(0 /* xid */,
3704                                     rdata->cfile->fid.persistent_fid,
3705                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3706                                     rdata->bytes, rdata->result);
3707         } else
3708                 trace_smb3_read_done(0 /* xid */,
3709                                      rdata->cfile->fid.persistent_fid,
3710                                      tcon->tid, tcon->ses->Suid,
3711                                      rdata->offset, rdata->got_bytes);
3712
3713         queue_work(cifsiod_wq, &rdata->work);
3714         DeleteMidQEntry(mid);
3715         add_credits(server, &credits, 0);
3716 }
3717
3718 /* smb2_async_readv - send an async read, and set up mid to handle result */
3719 int
3720 smb2_async_readv(struct cifs_readdata *rdata)
3721 {
3722         int rc, flags = 0;
3723         char *buf;
3724         struct smb2_sync_hdr *shdr;
3725         struct cifs_io_parms io_parms;
3726         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3727                                  .rq_nvec = 1 };
3728         struct TCP_Server_Info *server;
3729         unsigned int total_len;
3730
3731         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3732                  __func__, rdata->offset, rdata->bytes);
3733
3734         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3735         io_parms.offset = rdata->offset;
3736         io_parms.length = rdata->bytes;
3737         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3738         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3739         io_parms.pid = rdata->pid;
3740
3741         server = io_parms.tcon->ses->server;
3742
3743         rc = smb2_new_read_req(
3744                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3745         if (rc)
3746                 return rc;
3747
3748         if (smb3_encryption_required(io_parms.tcon))
3749                 flags |= CIFS_TRANSFORM_REQ;
3750
3751         rdata->iov[0].iov_base = buf;
3752         rdata->iov[0].iov_len = total_len;
3753
3754         shdr = (struct smb2_sync_hdr *)buf;
3755
3756         if (rdata->credits.value > 0) {
3757                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3758                                                 SMB2_MAX_BUFFER_SIZE));
3759                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
3760
3761                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3762                 if (rc)
3763                         goto async_readv_out;
3764
3765                 flags |= CIFS_HAS_CREDITS;
3766         }
3767
3768         kref_get(&rdata->refcount);
3769         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3770                              cifs_readv_receive, smb2_readv_callback,
3771                              smb3_handle_read_data, rdata, flags,
3772                              &rdata->credits);
3773         if (rc) {
3774                 kref_put(&rdata->refcount, cifs_readdata_release);
3775                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3776                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3777                                     io_parms.tcon->tid,
3778                                     io_parms.tcon->ses->Suid,
3779                                     io_parms.offset, io_parms.length, rc);
3780         }
3781
3782 async_readv_out:
3783         cifs_small_buf_release(buf);
3784         return rc;
3785 }
3786
3787 int
3788 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3789           unsigned int *nbytes, char **buf, int *buf_type)
3790 {
3791         struct smb_rqst rqst;
3792         int resp_buftype, rc;
3793         struct smb2_read_plain_req *req = NULL;
3794         struct smb2_read_rsp *rsp = NULL;
3795         struct kvec iov[1];
3796         struct kvec rsp_iov;
3797         unsigned int total_len;
3798         int flags = CIFS_LOG_ERROR;
3799         struct cifs_ses *ses = io_parms->tcon->ses;
3800
3801         *nbytes = 0;
3802         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3803         if (rc)
3804                 return rc;
3805
3806         if (smb3_encryption_required(io_parms->tcon))
3807                 flags |= CIFS_TRANSFORM_REQ;
3808
3809         iov[0].iov_base = (char *)req;
3810         iov[0].iov_len = total_len;
3811
3812         memset(&rqst, 0, sizeof(struct smb_rqst));
3813         rqst.rq_iov = iov;
3814         rqst.rq_nvec = 1;
3815
3816         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3817         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3818
3819         if (rc) {
3820                 if (rc != -ENODATA) {
3821                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3822                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3823                         trace_smb3_read_err(xid, req->PersistentFileId,
3824                                             io_parms->tcon->tid, ses->Suid,
3825                                             io_parms->offset, io_parms->length,
3826                                             rc);
3827                 } else
3828                         trace_smb3_read_done(xid, req->PersistentFileId,
3829                                     io_parms->tcon->tid, ses->Suid,
3830                                     io_parms->offset, 0);
3831                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3832                 cifs_small_buf_release(req);
3833                 return rc == -ENODATA ? 0 : rc;
3834         } else
3835                 trace_smb3_read_done(xid, req->PersistentFileId,
3836                                     io_parms->tcon->tid, ses->Suid,
3837                                     io_parms->offset, io_parms->length);
3838
3839         cifs_small_buf_release(req);
3840
3841         *nbytes = le32_to_cpu(rsp->DataLength);
3842         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3843             (*nbytes > io_parms->length)) {
3844                 cifs_dbg(FYI, "bad length %d for count %d\n",
3845                          *nbytes, io_parms->length);
3846                 rc = -EIO;
3847                 *nbytes = 0;
3848         }
3849
3850         if (*buf) {
3851                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3852                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3853         } else if (resp_buftype != CIFS_NO_BUFFER) {
3854                 *buf = rsp_iov.iov_base;
3855                 if (resp_buftype == CIFS_SMALL_BUFFER)
3856                         *buf_type = CIFS_SMALL_BUFFER;
3857                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3858                         *buf_type = CIFS_LARGE_BUFFER;
3859         }
3860         return rc;
3861 }
3862
3863 /*
3864  * Check the mid_state and signature on received buffer (if any), and queue the
3865  * workqueue completion task.
3866  */
3867 static void
3868 smb2_writev_callback(struct mid_q_entry *mid)
3869 {
3870         struct cifs_writedata *wdata = mid->callback_data;
3871         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3872         struct TCP_Server_Info *server = tcon->ses->server;
3873         unsigned int written;
3874         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3875         struct cifs_credits credits = { .value = 0, .instance = 0 };
3876
3877         switch (mid->mid_state) {
3878         case MID_RESPONSE_RECEIVED:
3879                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3880                 credits.instance = server->reconnect_instance;
3881                 wdata->result = smb2_check_receive(mid, server, 0);
3882                 if (wdata->result != 0)
3883                         break;
3884
3885                 written = le32_to_cpu(rsp->DataLength);
3886                 /*
3887                  * Mask off high 16 bits when bytes written as returned
3888                  * by the server is greater than bytes requested by the
3889                  * client. OS/2 servers are known to set incorrect
3890                  * CountHigh values.
3891                  */
3892                 if (written > wdata->bytes)
3893                         written &= 0xFFFF;
3894
3895                 if (written < wdata->bytes)
3896                         wdata->result = -ENOSPC;
3897                 else
3898                         wdata->bytes = written;
3899                 break;
3900         case MID_REQUEST_SUBMITTED:
3901         case MID_RETRY_NEEDED:
3902                 wdata->result = -EAGAIN;
3903                 break;
3904         case MID_RESPONSE_MALFORMED:
3905                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3906                 credits.instance = server->reconnect_instance;
3907                 /* fall through */
3908         default:
3909                 wdata->result = -EIO;
3910                 break;
3911         }
3912 #ifdef CONFIG_CIFS_SMB_DIRECT
3913         /*
3914          * If this wdata has a memory registered, the MR can be freed
3915          * The number of MRs available is limited, it's important to recover
3916          * used MR as soon as I/O is finished. Hold MR longer in the later
3917          * I/O process can possibly result in I/O deadlock due to lack of MR
3918          * to send request on I/O retry
3919          */
3920         if (wdata->mr) {
3921                 smbd_deregister_mr(wdata->mr);
3922                 wdata->mr = NULL;
3923         }
3924 #endif
3925         if (wdata->result) {
3926                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3927                 trace_smb3_write_err(0 /* no xid */,
3928                                      wdata->cfile->fid.persistent_fid,
3929                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3930                                      wdata->bytes, wdata->result);
3931                 if (wdata->result == -ENOSPC)
3932                         printk_once(KERN_WARNING "Out of space writing to %s\n",
3933                                     tcon->treeName);
3934         } else
3935                 trace_smb3_write_done(0 /* no xid */,
3936                                       wdata->cfile->fid.persistent_fid,
3937                                       tcon->tid, tcon->ses->Suid,
3938                                       wdata->offset, wdata->bytes);
3939
3940         queue_work(cifsiod_wq, &wdata->work);
3941         DeleteMidQEntry(mid);
3942         add_credits(server, &credits, 0);
3943 }
3944
3945 /* smb2_async_writev - send an async write, and set up mid to handle result */
3946 int
3947 smb2_async_writev(struct cifs_writedata *wdata,
3948                   void (*release)(struct kref *kref))
3949 {
3950         int rc = -EACCES, flags = 0;
3951         struct smb2_write_req *req = NULL;
3952         struct smb2_sync_hdr *shdr;
3953         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3954         struct TCP_Server_Info *server = tcon->ses->server;
3955         struct kvec iov[1];
3956         struct smb_rqst rqst = { };
3957         unsigned int total_len;
3958
3959         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3960         if (rc)
3961                 return rc;
3962
3963         if (smb3_encryption_required(tcon))
3964                 flags |= CIFS_TRANSFORM_REQ;
3965
3966         shdr = (struct smb2_sync_hdr *)req;
3967         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3968
3969         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3970         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3971         req->WriteChannelInfoOffset = 0;
3972         req->WriteChannelInfoLength = 0;
3973         req->Channel = 0;
3974         req->Offset = cpu_to_le64(wdata->offset);
3975         req->DataOffset = cpu_to_le16(
3976                                 offsetof(struct smb2_write_req, Buffer));
3977         req->RemainingBytes = 0;
3978
3979         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3980                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3981 #ifdef CONFIG_CIFS_SMB_DIRECT
3982         /*
3983          * If we want to do a server RDMA read, fill in and append
3984          * smbd_buffer_descriptor_v1 to the end of write request
3985          */
3986         if (server->rdma && !server->sign && wdata->bytes >=
3987                 server->smbd_conn->rdma_readwrite_threshold) {
3988
3989                 struct smbd_buffer_descriptor_v1 *v1;
3990                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3991
3992                 wdata->mr = smbd_register_mr(
3993                                 server->smbd_conn, wdata->pages,
3994                                 wdata->nr_pages, wdata->page_offset,
3995                                 wdata->tailsz, false, need_invalidate);
3996                 if (!wdata->mr) {
3997                         rc = -EAGAIN;
3998                         goto async_writev_out;
3999                 }
4000                 req->Length = 0;
4001                 req->DataOffset = 0;
4002                 if (wdata->nr_pages > 1)
4003                         req->RemainingBytes =
4004                                 cpu_to_le32(
4005                                         (wdata->nr_pages - 1) * wdata->pagesz -
4006                                         wdata->page_offset + wdata->tailsz
4007                                 );
4008                 else
4009                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4010                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4011                 if (need_invalidate)
4012                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4013                 req->WriteChannelInfoOffset =
4014                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4015                 req->WriteChannelInfoLength =
4016                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4017                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4018                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4019                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4020                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4021         }
4022 #endif
4023         iov[0].iov_len = total_len - 1;
4024         iov[0].iov_base = (char *)req;
4025
4026         rqst.rq_iov = iov;
4027         rqst.rq_nvec = 1;
4028         rqst.rq_pages = wdata->pages;
4029         rqst.rq_offset = wdata->page_offset;
4030         rqst.rq_npages = wdata->nr_pages;
4031         rqst.rq_pagesz = wdata->pagesz;
4032         rqst.rq_tailsz = wdata->tailsz;
4033 #ifdef CONFIG_CIFS_SMB_DIRECT
4034         if (wdata->mr) {
4035                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4036                 rqst.rq_npages = 0;
4037         }
4038 #endif
4039         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4040                  wdata->offset, wdata->bytes);
4041
4042 #ifdef CONFIG_CIFS_SMB_DIRECT
4043         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4044         if (!wdata->mr)
4045                 req->Length = cpu_to_le32(wdata->bytes);
4046 #else
4047         req->Length = cpu_to_le32(wdata->bytes);
4048 #endif
4049
4050         if (wdata->credits.value > 0) {
4051                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4052                                                     SMB2_MAX_BUFFER_SIZE));
4053                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4054
4055                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4056                 if (rc)
4057                         goto async_writev_out;
4058
4059                 flags |= CIFS_HAS_CREDITS;
4060         }
4061
4062         kref_get(&wdata->refcount);
4063         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4064                              wdata, flags, &wdata->credits);
4065
4066         if (rc) {
4067                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4068                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4069                                      wdata->bytes, rc);
4070                 kref_put(&wdata->refcount, release);
4071                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4072         }
4073
4074 async_writev_out:
4075         cifs_small_buf_release(req);
4076         return rc;
4077 }
4078
4079 /*
4080  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4081  * The length field from io_parms must be at least 1 and indicates a number of
4082  * elements with data to write that begins with position 1 in iov array. All
4083  * data length is specified by count.
4084  */
4085 int
4086 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4087            unsigned int *nbytes, struct kvec *iov, int n_vec)
4088 {
4089         struct smb_rqst rqst;
4090         int rc = 0;
4091         struct smb2_write_req *req = NULL;
4092         struct smb2_write_rsp *rsp = NULL;
4093         int resp_buftype;
4094         struct kvec rsp_iov;
4095         int flags = 0;
4096         unsigned int total_len;
4097
4098         *nbytes = 0;
4099
4100         if (n_vec < 1)
4101                 return rc;
4102
4103         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
4104                              &total_len);
4105         if (rc)
4106                 return rc;
4107
4108         if (io_parms->tcon->ses->server == NULL)
4109                 return -ECONNABORTED;
4110
4111         if (smb3_encryption_required(io_parms->tcon))
4112                 flags |= CIFS_TRANSFORM_REQ;
4113
4114         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4115
4116         req->PersistentFileId = io_parms->persistent_fid;
4117         req->VolatileFileId = io_parms->volatile_fid;
4118         req->WriteChannelInfoOffset = 0;
4119         req->WriteChannelInfoLength = 0;
4120         req->Channel = 0;
4121         req->Length = cpu_to_le32(io_parms->length);
4122         req->Offset = cpu_to_le64(io_parms->offset);
4123         req->DataOffset = cpu_to_le16(
4124                                 offsetof(struct smb2_write_req, Buffer));
4125         req->RemainingBytes = 0;
4126
4127         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4128                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4129                 io_parms->offset, io_parms->length);
4130
4131         iov[0].iov_base = (char *)req;
4132         /* 1 for Buffer */
4133         iov[0].iov_len = total_len - 1;
4134
4135         memset(&rqst, 0, sizeof(struct smb_rqst));
4136         rqst.rq_iov = iov;
4137         rqst.rq_nvec = n_vec + 1;
4138
4139         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
4140                             &resp_buftype, flags, &rsp_iov);
4141         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4142
4143         if (rc) {
4144                 trace_smb3_write_err(xid, req->PersistentFileId,
4145                                      io_parms->tcon->tid,
4146                                      io_parms->tcon->ses->Suid,
4147                                      io_parms->offset, io_parms->length, rc);
4148                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4149                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4150         } else {
4151                 *nbytes = le32_to_cpu(rsp->DataLength);
4152                 trace_smb3_write_done(xid, req->PersistentFileId,
4153                                      io_parms->tcon->tid,
4154                                      io_parms->tcon->ses->Suid,
4155                                      io_parms->offset, *nbytes);
4156         }
4157
4158         cifs_small_buf_release(req);
4159         free_rsp_buf(resp_buftype, rsp);
4160         return rc;
4161 }
4162
4163 static unsigned int
4164 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
4165 {
4166         int len;
4167         unsigned int entrycount = 0;
4168         unsigned int next_offset = 0;
4169         char *entryptr;
4170         FILE_DIRECTORY_INFO *dir_info;
4171
4172         if (bufstart == NULL)
4173                 return 0;
4174
4175         entryptr = bufstart;
4176
4177         while (1) {
4178                 if (entryptr + next_offset < entryptr ||
4179                     entryptr + next_offset > end_of_buf ||
4180                     entryptr + next_offset + size > end_of_buf) {
4181                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4182                         break;
4183                 }
4184
4185                 entryptr = entryptr + next_offset;
4186                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4187
4188                 len = le32_to_cpu(dir_info->FileNameLength);
4189                 if (entryptr + len < entryptr ||
4190                     entryptr + len > end_of_buf ||
4191                     entryptr + len + size > end_of_buf) {
4192                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4193                                  end_of_buf);
4194                         break;
4195                 }
4196
4197                 *lastentry = entryptr;
4198                 entrycount++;
4199
4200                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4201                 if (!next_offset)
4202                         break;
4203         }
4204
4205         return entrycount;
4206 }
4207
4208 /*
4209  * Readdir/FindFirst
4210  */
4211 int
4212 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4213                      u64 persistent_fid, u64 volatile_fid, int index,
4214                      struct cifs_search_info *srch_inf)
4215 {
4216         struct smb_rqst rqst;
4217         struct smb2_query_directory_req *req;
4218         struct smb2_query_directory_rsp *rsp = NULL;
4219         struct kvec iov[2];
4220         struct kvec rsp_iov;
4221         int rc = 0;
4222         int len;
4223         int resp_buftype = CIFS_NO_BUFFER;
4224         unsigned char *bufptr;
4225         struct TCP_Server_Info *server;
4226         struct cifs_ses *ses = tcon->ses;
4227         __le16 asteriks = cpu_to_le16('*');
4228         char *end_of_smb;
4229         unsigned int output_size = CIFSMaxBufSize;
4230         size_t info_buf_size;
4231         int flags = 0;
4232         unsigned int total_len;
4233
4234         if (ses && (ses->server))
4235                 server = ses->server;
4236         else
4237                 return -EIO;
4238
4239         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
4240                              &total_len);
4241         if (rc)
4242                 return rc;
4243
4244         if (smb3_encryption_required(tcon))
4245                 flags |= CIFS_TRANSFORM_REQ;
4246
4247         switch (srch_inf->info_level) {
4248         case SMB_FIND_FILE_DIRECTORY_INFO:
4249                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4250                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4251                 break;
4252         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4253                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4254                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4255                 break;
4256         default:
4257                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4258                          srch_inf->info_level);
4259                 rc = -EINVAL;
4260                 goto qdir_exit;
4261         }
4262
4263         req->FileIndex = cpu_to_le32(index);
4264         req->PersistentFileId = persistent_fid;
4265         req->VolatileFileId = volatile_fid;
4266
4267         len = 0x2;
4268         bufptr = req->Buffer;
4269         memcpy(bufptr, &asteriks, len);
4270
4271         req->FileNameOffset =
4272                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4273         req->FileNameLength = cpu_to_le16(len);
4274         /*
4275          * BB could be 30 bytes or so longer if we used SMB2 specific
4276          * buffer lengths, but this is safe and close enough.
4277          */
4278         output_size = min_t(unsigned int, output_size, server->maxBuf);
4279         output_size = min_t(unsigned int, output_size, 2 << 15);
4280         req->OutputBufferLength = cpu_to_le32(output_size);
4281
4282         iov[0].iov_base = (char *)req;
4283         /* 1 for Buffer */
4284         iov[0].iov_len = total_len - 1;
4285
4286         iov[1].iov_base = (char *)(req->Buffer);
4287         iov[1].iov_len = len;
4288
4289         memset(&rqst, 0, sizeof(struct smb_rqst));
4290         rqst.rq_iov = iov;
4291         rqst.rq_nvec = 2;
4292
4293         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4294                         tcon->ses->Suid, index, output_size);
4295
4296         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4297         cifs_small_buf_release(req);
4298         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4299
4300         if (rc) {
4301                 if (rc == -ENODATA &&
4302                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4303                         trace_smb3_query_dir_done(xid, persistent_fid,
4304                                 tcon->tid, tcon->ses->Suid, index, 0);
4305                         srch_inf->endOfSearch = true;
4306                         rc = 0;
4307                 } else {
4308                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4309                                 tcon->ses->Suid, index, 0, rc);
4310                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4311                 }
4312                 goto qdir_exit;
4313         }
4314
4315         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4316                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4317                                info_buf_size);
4318         if (rc) {
4319                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4320                         tcon->ses->Suid, index, 0, rc);
4321                 goto qdir_exit;
4322         }
4323
4324         srch_inf->unicode = true;
4325
4326         if (srch_inf->ntwrk_buf_start) {
4327                 if (srch_inf->smallBuf)
4328                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4329                 else
4330                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4331         }
4332         srch_inf->ntwrk_buf_start = (char *)rsp;
4333         srch_inf->srch_entries_start = srch_inf->last_entry =
4334                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4335         end_of_smb = rsp_iov.iov_len + (char *)rsp;
4336         srch_inf->entries_in_buffer =
4337                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4338                                     &srch_inf->last_entry, info_buf_size);
4339         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4340         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4341                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4342                  srch_inf->srch_entries_start, srch_inf->last_entry);
4343         if (resp_buftype == CIFS_LARGE_BUFFER)
4344                 srch_inf->smallBuf = false;
4345         else if (resp_buftype == CIFS_SMALL_BUFFER)
4346                 srch_inf->smallBuf = true;
4347         else
4348                 cifs_tcon_dbg(VFS, "illegal search buffer type\n");
4349
4350         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4351                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4352         return rc;
4353
4354 qdir_exit:
4355         free_rsp_buf(resp_buftype, rsp);
4356         return rc;
4357 }
4358
4359 int
4360 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4361                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4362                u8 info_type, u32 additional_info,
4363                 void **data, unsigned int *size)
4364 {
4365         struct smb2_set_info_req *req;
4366         struct kvec *iov = rqst->rq_iov;
4367         unsigned int i, total_len;
4368         int rc;
4369
4370         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4371         if (rc)
4372                 return rc;
4373
4374         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4375         req->InfoType = info_type;
4376         req->FileInfoClass = info_class;
4377         req->PersistentFileId = persistent_fid;
4378         req->VolatileFileId = volatile_fid;
4379         req->AdditionalInformation = cpu_to_le32(additional_info);
4380
4381         req->BufferOffset =
4382                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4383         req->BufferLength = cpu_to_le32(*size);
4384
4385         memcpy(req->Buffer, *data, *size);
4386         total_len += *size;
4387
4388         iov[0].iov_base = (char *)req;
4389         /* 1 for Buffer */
4390         iov[0].iov_len = total_len - 1;
4391
4392         for (i = 1; i < rqst->rq_nvec; i++) {
4393                 le32_add_cpu(&req->BufferLength, size[i]);
4394                 iov[i].iov_base = (char *)data[i];
4395                 iov[i].iov_len = size[i];
4396         }
4397
4398         return 0;
4399 }
4400
4401 void
4402 SMB2_set_info_free(struct smb_rqst *rqst)
4403 {
4404         if (rqst && rqst->rq_iov)
4405                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4406 }
4407
4408 static int
4409 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4410                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4411                u8 info_type, u32 additional_info, unsigned int num,
4412                 void **data, unsigned int *size)
4413 {
4414         struct smb_rqst rqst;
4415         struct smb2_set_info_rsp *rsp = NULL;
4416         struct kvec *iov;
4417         struct kvec rsp_iov;
4418         int rc = 0;
4419         int resp_buftype;
4420         struct cifs_ses *ses = tcon->ses;
4421         int flags = 0;
4422
4423         if (!ses || !(ses->server))
4424                 return -EIO;
4425
4426         if (!num)
4427                 return -EINVAL;
4428
4429         if (smb3_encryption_required(tcon))
4430                 flags |= CIFS_TRANSFORM_REQ;
4431
4432         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4433         if (!iov)
4434                 return -ENOMEM;
4435
4436         memset(&rqst, 0, sizeof(struct smb_rqst));
4437         rqst.rq_iov = iov;
4438         rqst.rq_nvec = num;
4439
4440         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4441                                 info_class, info_type, additional_info,
4442                                 data, size);
4443         if (rc) {
4444                 kfree(iov);
4445                 return rc;
4446         }
4447
4448
4449         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4450                             &rsp_iov);
4451         SMB2_set_info_free(&rqst);
4452         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4453
4454         if (rc != 0) {
4455                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4456                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4457                                 ses->Suid, info_class, (__u32)info_type, rc);
4458         }
4459
4460         free_rsp_buf(resp_buftype, rsp);
4461         kfree(iov);
4462         return rc;
4463 }
4464
4465 int
4466 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4467              u64 volatile_fid, u32 pid, __le64 *eof)
4468 {
4469         struct smb2_file_eof_info info;
4470         void *data;
4471         unsigned int size;
4472
4473         info.EndOfFile = *eof;
4474
4475         data = &info;
4476         size = sizeof(struct smb2_file_eof_info);
4477
4478         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4479                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4480                         0, 1, &data, &size);
4481 }
4482
4483 int
4484 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4485                 u64 persistent_fid, u64 volatile_fid,
4486                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4487 {
4488         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4489                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4490                         1, (void **)&pnntsd, &pacllen);
4491 }
4492
4493 int
4494 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4495             u64 persistent_fid, u64 volatile_fid,
4496             struct smb2_file_full_ea_info *buf, int len)
4497 {
4498         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4499                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4500                 0, 1, (void **)&buf, &len);
4501 }
4502
4503 int
4504 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4505                   const u64 persistent_fid, const u64 volatile_fid,
4506                   __u8 oplock_level)
4507 {
4508         struct smb_rqst rqst;
4509         int rc;
4510         struct smb2_oplock_break *req = NULL;
4511         struct cifs_ses *ses = tcon->ses;
4512         int flags = CIFS_OBREAK_OP;
4513         unsigned int total_len;
4514         struct kvec iov[1];
4515         struct kvec rsp_iov;
4516         int resp_buf_type;
4517
4518         cifs_dbg(FYI, "SMB2_oplock_break\n");
4519         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4520                              &total_len);
4521         if (rc)
4522                 return rc;
4523
4524         if (smb3_encryption_required(tcon))
4525                 flags |= CIFS_TRANSFORM_REQ;
4526
4527         req->VolatileFid = volatile_fid;
4528         req->PersistentFid = persistent_fid;
4529         req->OplockLevel = oplock_level;
4530         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4531
4532         flags |= CIFS_NO_RSP_BUF;
4533
4534         iov[0].iov_base = (char *)req;
4535         iov[0].iov_len = total_len;
4536
4537         memset(&rqst, 0, sizeof(struct smb_rqst));
4538         rqst.rq_iov = iov;
4539         rqst.rq_nvec = 1;
4540
4541         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4542         cifs_small_buf_release(req);
4543
4544         if (rc) {
4545                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4546                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4547         }
4548
4549         return rc;
4550 }
4551
4552 void
4553 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4554                              struct kstatfs *kst)
4555 {
4556         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4557                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4558         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4559         kst->f_bfree  = kst->f_bavail =
4560                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4561         return;
4562 }
4563
4564 static void
4565 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4566                         struct kstatfs *kst)
4567 {
4568         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4569         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4570         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4571         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4572                 kst->f_bavail = kst->f_bfree;
4573         else
4574                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4575         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4576                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4577         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4578                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4579
4580         return;
4581 }
4582
4583 static int
4584 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4585                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4586 {
4587         int rc;
4588         struct smb2_query_info_req *req;
4589         unsigned int total_len;
4590
4591         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4592
4593         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4594                 return -EIO;
4595
4596         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4597                              &total_len);
4598         if (rc)
4599                 return rc;
4600
4601         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4602         req->FileInfoClass = level;
4603         req->PersistentFileId = persistent_fid;
4604         req->VolatileFileId = volatile_fid;
4605         /* 1 for pad */
4606         req->InputBufferOffset =
4607                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4608         req->OutputBufferLength = cpu_to_le32(
4609                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4610
4611         iov->iov_base = (char *)req;
4612         iov->iov_len = total_len;
4613         return 0;
4614 }
4615
4616 int
4617 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4618               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4619 {
4620         struct smb_rqst rqst;
4621         struct smb2_query_info_rsp *rsp = NULL;
4622         struct kvec iov;
4623         struct kvec rsp_iov;
4624         int rc = 0;
4625         int resp_buftype;
4626         struct cifs_ses *ses = tcon->ses;
4627         FILE_SYSTEM_POSIX_INFO *info = NULL;
4628         int flags = 0;
4629
4630         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4631                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4632                                 persistent_fid, volatile_fid);
4633         if (rc)
4634                 return rc;
4635
4636         if (smb3_encryption_required(tcon))
4637                 flags |= CIFS_TRANSFORM_REQ;
4638
4639         memset(&rqst, 0, sizeof(struct smb_rqst));
4640         rqst.rq_iov = &iov;
4641         rqst.rq_nvec = 1;
4642
4643         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4644         cifs_small_buf_release(iov.iov_base);
4645         if (rc) {
4646                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4647                 goto posix_qfsinf_exit;
4648         }
4649         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4650
4651         info = (FILE_SYSTEM_POSIX_INFO *)(
4652                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4653         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4654                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4655                                sizeof(FILE_SYSTEM_POSIX_INFO));
4656         if (!rc)
4657                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4658
4659 posix_qfsinf_exit:
4660         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4661         return rc;
4662 }
4663
4664 int
4665 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4666               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4667 {
4668         struct smb_rqst rqst;
4669         struct smb2_query_info_rsp *rsp = NULL;
4670         struct kvec iov;
4671         struct kvec rsp_iov;
4672         int rc = 0;
4673         int resp_buftype;
4674         struct cifs_ses *ses = tcon->ses;
4675         struct smb2_fs_full_size_info *info = NULL;
4676         int flags = 0;
4677
4678         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4679                                 sizeof(struct smb2_fs_full_size_info),
4680                                 persistent_fid, volatile_fid);
4681         if (rc)
4682                 return rc;
4683
4684         if (smb3_encryption_required(tcon))
4685                 flags |= CIFS_TRANSFORM_REQ;
4686
4687         memset(&rqst, 0, sizeof(struct smb_rqst));
4688         rqst.rq_iov = &iov;
4689         rqst.rq_nvec = 1;
4690
4691         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4692         cifs_small_buf_release(iov.iov_base);
4693         if (rc) {
4694                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4695                 goto qfsinf_exit;
4696         }
4697         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4698
4699         info = (struct smb2_fs_full_size_info *)(
4700                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4701         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4702                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4703                                sizeof(struct smb2_fs_full_size_info));
4704         if (!rc)
4705                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4706
4707 qfsinf_exit:
4708         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4709         return rc;
4710 }
4711
4712 int
4713 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4714               u64 persistent_fid, u64 volatile_fid, int level)
4715 {
4716         struct smb_rqst rqst;
4717         struct smb2_query_info_rsp *rsp = NULL;
4718         struct kvec iov;
4719         struct kvec rsp_iov;
4720         int rc = 0;
4721         int resp_buftype, max_len, min_len;
4722         struct cifs_ses *ses = tcon->ses;
4723         unsigned int rsp_len, offset;
4724         int flags = 0;
4725
4726         if (level == FS_DEVICE_INFORMATION) {
4727                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4728                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4729         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4730                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4731                 min_len = MIN_FS_ATTR_INFO_SIZE;
4732         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4733                 max_len = sizeof(struct smb3_fs_ss_info);
4734                 min_len = sizeof(struct smb3_fs_ss_info);
4735         } else if (level == FS_VOLUME_INFORMATION) {
4736                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4737                 min_len = sizeof(struct smb3_fs_vol_info);
4738         } else {
4739                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4740                 return -EINVAL;
4741         }
4742
4743         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4744                                 persistent_fid, volatile_fid);
4745         if (rc)
4746                 return rc;
4747
4748         if (smb3_encryption_required(tcon))
4749                 flags |= CIFS_TRANSFORM_REQ;
4750
4751         memset(&rqst, 0, sizeof(struct smb_rqst));
4752         rqst.rq_iov = &iov;
4753         rqst.rq_nvec = 1;
4754
4755         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4756         cifs_small_buf_release(iov.iov_base);
4757         if (rc) {
4758                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4759                 goto qfsattr_exit;
4760         }
4761         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4762
4763         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4764         offset = le16_to_cpu(rsp->OutputBufferOffset);
4765         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4766         if (rc)
4767                 goto qfsattr_exit;
4768
4769         if (level == FS_ATTRIBUTE_INFORMATION)
4770                 memcpy(&tcon->fsAttrInfo, offset
4771                         + (char *)rsp, min_t(unsigned int,
4772                         rsp_len, max_len));
4773         else if (level == FS_DEVICE_INFORMATION)
4774                 memcpy(&tcon->fsDevInfo, offset
4775                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4776         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4777                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4778                         (offset + (char *)rsp);
4779                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4780                 tcon->perf_sector_size =
4781                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4782         } else if (level == FS_VOLUME_INFORMATION) {
4783                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4784                         (offset + (char *)rsp);
4785                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4786                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4787         }
4788
4789 qfsattr_exit:
4790         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4791         return rc;
4792 }
4793
4794 int
4795 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4796            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4797            const __u32 num_lock, struct smb2_lock_element *buf)
4798 {
4799         struct smb_rqst rqst;
4800         int rc = 0;
4801         struct smb2_lock_req *req = NULL;
4802         struct kvec iov[2];
4803         struct kvec rsp_iov;
4804         int resp_buf_type;
4805         unsigned int count;
4806         int flags = CIFS_NO_RSP_BUF;
4807         unsigned int total_len;
4808
4809         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4810
4811         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4812         if (rc)
4813                 return rc;
4814
4815         if (smb3_encryption_required(tcon))
4816                 flags |= CIFS_TRANSFORM_REQ;
4817
4818         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4819         req->LockCount = cpu_to_le16(num_lock);
4820
4821         req->PersistentFileId = persist_fid;
4822         req->VolatileFileId = volatile_fid;
4823
4824         count = num_lock * sizeof(struct smb2_lock_element);
4825
4826         iov[0].iov_base = (char *)req;
4827         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4828         iov[1].iov_base = (char *)buf;
4829         iov[1].iov_len = count;
4830
4831         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4832
4833         memset(&rqst, 0, sizeof(struct smb_rqst));
4834         rqst.rq_iov = iov;
4835         rqst.rq_nvec = 2;
4836
4837         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4838                             &rsp_iov);
4839         cifs_small_buf_release(req);
4840         if (rc) {
4841                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4842                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4843                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4844                                     tcon->ses->Suid, rc);
4845         }
4846
4847         return rc;
4848 }
4849
4850 int
4851 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4852           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4853           const __u64 length, const __u64 offset, const __u32 lock_flags,
4854           const bool wait)
4855 {
4856         struct smb2_lock_element lock;
4857
4858         lock.Offset = cpu_to_le64(offset);
4859         lock.Length = cpu_to_le64(length);
4860         lock.Flags = cpu_to_le32(lock_flags);
4861         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4862                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4863
4864         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4865 }
4866
4867 int
4868 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4869                  __u8 *lease_key, const __le32 lease_state)
4870 {
4871         struct smb_rqst rqst;
4872         int rc;
4873         struct smb2_lease_ack *req = NULL;
4874         struct cifs_ses *ses = tcon->ses;
4875         int flags = CIFS_OBREAK_OP;
4876         unsigned int total_len;
4877         struct kvec iov[1];
4878         struct kvec rsp_iov;
4879         int resp_buf_type;
4880         __u64 *please_key_high;
4881         __u64 *please_key_low;
4882
4883         cifs_dbg(FYI, "SMB2_lease_break\n");
4884         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4885                              &total_len);
4886         if (rc)
4887                 return rc;
4888
4889         if (smb3_encryption_required(tcon))
4890                 flags |= CIFS_TRANSFORM_REQ;
4891
4892         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4893         req->StructureSize = cpu_to_le16(36);
4894         total_len += 12;
4895
4896         memcpy(req->LeaseKey, lease_key, 16);
4897         req->LeaseState = lease_state;
4898
4899         flags |= CIFS_NO_RSP_BUF;
4900
4901         iov[0].iov_base = (char *)req;
4902         iov[0].iov_len = total_len;
4903
4904         memset(&rqst, 0, sizeof(struct smb_rqst));
4905         rqst.rq_iov = iov;
4906         rqst.rq_nvec = 1;
4907
4908         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4909         cifs_small_buf_release(req);
4910
4911         please_key_low = (__u64 *)lease_key;
4912         please_key_high = (__u64 *)(lease_key+8);
4913         if (rc) {
4914                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4915                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4916                         ses->Suid, *please_key_low, *please_key_high, rc);
4917                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4918         } else
4919                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4920                         ses->Suid, *please_key_low, *please_key_high);
4921
4922         return rc;
4923 }