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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2020 Tintri by DDN, Inc. All rights reserved.
*/
/*
* Dispatch function for SMB2_READ
* MS-SMB2 sec. 3.3.5.12
*/
#include <smbsrv/smb2_kproto.h>
#include <smbsrv/smb_fsops.h>
extern boolean_t smb_allow_unbuffered;
smb_sdrc_t
smb2_read(smb_request_t *sr)
{
smb_rw_param_t *param = NULL;
smb_ofile_t *of = NULL;
smb_vdb_t *vdb = NULL;
struct mbuf *m = NULL;
uint16_t StructSize;
uint8_t Padding;
uint8_t Flags;
uint8_t DataOff;
uint32_t Length;
uint64_t Offset;
smb2fid_t smb2fid;
uint32_t MinCount;
uint32_t Channel;
uint32_t Remaining;
uint16_t ChanInfoOffset;
uint16_t ChanInfoLength;
uint32_t XferCount;
uint32_t status;
int rc = 0;
boolean_t unbuffered = B_FALSE;
int ioflag = 0;
/*
* SMB2 Read request
*/
rc = smb_mbc_decodef(
&sr->smb_data,
"wbblqqqlllww",
&StructSize, /* w */
&Padding, /* b */
&Flags, /* b */
&Length, /* l */
&Offset, /* q */
&smb2fid.persistent, /* q */
&smb2fid.temporal, /* q */
&MinCount, /* l */
&Channel, /* l */
&Remaining, /* l */
&ChanInfoOffset, /* w */
&ChanInfoLength); /* w */
if (rc)
return (SDRC_ERROR);
if (StructSize != 49)
return (SDRC_ERROR);
/*
* Setup an smb_rw_param_t which contains the VDB we need.
* This is automatically free'd.
*/
param = smb_srm_zalloc(sr, sizeof (*param));
param->rw_offset = Offset;
param->rw_count = Length;
/* Note that the dtrace provider uses sr->arg.rw */
sr->arg.rw = param;
/*
* Want FID lookup before the start probe.
*/
status = smb2sr_lookup_fid(sr, &smb2fid);
of = sr->fid_ofile;
DTRACE_SMB2_START(op__Read, smb_request_t *, sr); /* arg.rw */
if (status)
goto errout; /* Bad FID */
if (Length > smb2_max_rwsize) {
status = NT_STATUS_INVALID_PARAMETER;
goto errout;
}
if (MinCount > Length)
MinCount = Length;
vdb = ¶m->rw_vdb;
vdb->vdb_tag = 0;
vdb->vdb_uio.uio_iov = &vdb->vdb_iovec[0];
vdb->vdb_uio.uio_iovcnt = MAX_IOVEC;
vdb->vdb_uio.uio_resid = Length;
vdb->vdb_uio.uio_loffset = (offset_t)Offset;
vdb->vdb_uio.uio_segflg = UIO_SYSSPACE;
vdb->vdb_uio.uio_extflg = UIO_COPY_DEFAULT;
sr->raw_data.max_bytes = Length;
m = smb_mbuf_allocate(&vdb->vdb_uio);
/*
* Unbuffered refers to the MS-FSA Read argument by the same name.
* It indicates that the cache for this range should be flushed to disk,
* and data read directly from disk, bypassing the cache.
* We don't allow that degree of cache management.
* Translate this directly as FRSYNC,
* which should at least flush the cache first.
*/
if (smb_allow_unbuffered &&
(Flags & SMB2_READFLAG_READ_UNBUFFERED) != 0) {
unbuffered = B_TRUE;
ioflag = FRSYNC;
}
switch (of->f_tree->t_res_type & STYPE_MASK) {
case STYPE_DISKTREE:
if (!smb_node_is_dir(of->f_node)) {
/* Check for conflicting locks. */
rc = smb_lock_range_access(sr, of->f_node,
Offset, Length, B_FALSE);
if (rc) {
rc = ERANGE;
break;
}
}
rc = smb_fsop_read(sr, of->f_cr, of->f_node, of,
&vdb->vdb_uio, ioflag);
break;
case STYPE_IPC:
if (unbuffered)
rc = EINVAL;
else
rc = smb_opipe_read(sr, &vdb->vdb_uio);
break;
default:
case STYPE_PRINTQ:
rc = EACCES;
break;
}
status = smb_errno2status(rc);
/* How much data we moved. */
XferCount = Length - vdb->vdb_uio.uio_resid;
sr->raw_data.max_bytes = XferCount;
smb_mbuf_trim(m, XferCount);
MBC_ATTACH_MBUF(&sr->raw_data, m);
/*
* [MS-SMB2] If the read returns fewer bytes than specified by
* the MinimumCount field of the request, the server MUST fail
* the request with STATUS_END_OF_FILE
*/
if (status == 0 && XferCount < MinCount)
status = NT_STATUS_END_OF_FILE;
/*
* Checking the error return _after_ dealing with
* the returned data so that if m was allocated,
* it will be free'd via sr->raw_data cleanup.
*/
errout:
sr->smb2_status = status;
DTRACE_SMB2_DONE(op__Read, smb_request_t *, sr); /* arg.rw */
if (status) {
smb2sr_put_error(sr, status);
return (SDRC_SUCCESS);
}
/*
* SMB2 Read reply
*/
DataOff = SMB2_HDR_SIZE + 16;
rc = smb_mbc_encodef(
&sr->reply,
"wb.lllC",
17, /* StructSize */ /* w */
DataOff, /* b. */
XferCount, /* l */
0, /* DataRemaining */ /* l */
0, /* reserved */ /* l */
&sr->raw_data); /* C */
if (rc) {
sr->smb2_status = NT_STATUS_INTERNAL_ERROR;
return (SDRC_ERROR);
}
mutex_enter(&of->f_mutex);
of->f_seek_pos = Offset + XferCount;
mutex_exit(&of->f_mutex);
return (SDRC_SUCCESS);
}
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