1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright 2017 Nexenta Systems, Inc.  All rights reserved.
  25  */
  26 
  27 /*
  28  * SMB: unlock_byte_range
  29  *
  30  * This message is sent to unlock the given byte range.  Offset, Count, and
  31  * Pid must be identical to that specified in a prior successful lock.  If
  32  *
  33  * an unlock references an address range that is not locked, no error is
  34  * generated.
  35  *
  36  * Since Offset is a 32 bit quantity, this request is inappropriate for
  37  * general locking within a very large file.
  38  *
  39  * Client Request                     Description
  40  * ================================== =================================
  41  *
  42  * UCHAR WordCount;                   Count of parameter words = 5
  43  * USHORT Fid;                        File handle
  44  * ULONG Count;                       Count of bytes to unlock
  45  * ULONG Offset;                      Offset from start of file
  46  * USHORT ByteCount;                  Count of data bytes = 0
  47  *
  48  * Server Response                    Description
  49  * ================================== =================================
  50  *
  51  * UCHAR WordCount;                   Count of parameter words = 0
  52  * USHORT ByteCount;                  Count of data bytes = 0
  53  */
  54 
  55 #include <smbsrv/smb_kproto.h>
  56 
  57 smb_sdrc_t
  58 smb_pre_unlock_byte_range(smb_request_t *sr)
  59 {
  60         DTRACE_SMB_START(op__UnlockByteRange, smb_request_t *, sr);
  61         return (SDRC_SUCCESS);
  62 }
  63 
  64 void
  65 smb_post_unlock_byte_range(smb_request_t *sr)
  66 {
  67         DTRACE_SMB_DONE(op__UnlockByteRange, smb_request_t *, sr);
  68 }
  69 
  70 smb_sdrc_t
  71 smb_com_unlock_byte_range(smb_request_t *sr)
  72 {
  73         uint32_t        Length;
  74         uint32_t        Offset;
  75         uint32_t        lk_pid;
  76         DWORD           result;
  77 
  78         if (smbsr_decode_vwv(sr, "wll", &sr->smb_fid, &Length, &Offset) != 0)
  79                 return (SDRC_ERROR);
  80 
  81         smbsr_lookup_file(sr);
  82         if (sr->fid_ofile == NULL) {
  83                 smbsr_error(sr, NT_STATUS_INVALID_HANDLE, ERRDOS, ERRbadfid);
  84                 return (SDRC_ERROR);
  85         }
  86 
  87         /* Note: SMB1 locking uses 16-bit PIDs. */
  88         lk_pid = sr->smb_pid & 0xFFFF;
  89 
  90         result = smb_unlock_range(sr, (uint64_t)Offset, (uint64_t)Length,
  91             lk_pid);
  92         if (result != NT_STATUS_SUCCESS) {
  93                 smbsr_error(sr, NT_STATUS_RANGE_NOT_LOCKED,
  94                     ERRDOS, ERROR_NOT_LOCKED);
  95                 return (SDRC_ERROR);
  96         }
  97 
  98         if (smbsr_encode_empty_result(sr))
  99                 return (SDRC_ERROR);
 100 
 101         return (SDRC_SUCCESS);
 102 }