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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 2014 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Dispatch function for SMB2_LOCK
*/
#include <smbsrv/smb2_kproto.h>
struct SMB2_LOCK_ELEMENT {
uint64_t Offset;
uint64_t Length;
uint32_t Flags;
uint32_t reserved;
};
static smb_sdrc_t smb2_lock_async(smb_request_t *);
static uint32_t smb2_lock_exec(smb_request_t *, uint16_t);
static uint32_t smb2_lock_elem(smb_request_t *, struct SMB2_LOCK_ELEMENT *);
/*
* This is a somewhat arbitrary sanity limit on the length of the
* SMB2_LOCK_ELEMENT array. It usually has length one or two.
*/
int smb2_lock_max_elem = 1024;
smb_sdrc_t
smb2_lock(smb_request_t *sr)
{
struct SMB2_LOCK_ELEMENT elem;
smb2fid_t smb2fid;
uint32_t save_offset;
uint32_t LockSequence;
uint32_t status;
uint16_t StructSize;
uint16_t LockCount;
uint16_t i;
boolean_t MayBlock = B_FALSE;
int rc = 0;
/*
* SMB2 Lock request
*/
rc = smb_mbc_decodef(
&sr->smb_data, "wwlqq",
&StructSize, /* w */
&LockCount, /* w */
&LockSequence, /* l */
&smb2fid.persistent, /* q */
&smb2fid.temporal); /* q */
if (rc || StructSize != 48)
return (SDRC_ERROR);
status = smb2sr_lookup_fid(sr, &smb2fid);
if (status)
goto errout;
if (sr->fid_ofile->f_node == NULL || LockCount == 0) {
status = NT_STATUS_INVALID_PARAMETER;
goto errout;
}
if (LockCount > smb2_lock_max_elem) {
status = NT_STATUS_INSUFFICIENT_RESOURCES;
goto errout;
}
/*
* Process the array of SMB2_LOCK_ELEMENT structs
* We do this twice. (it's always a short list)
* The first time, just validate the flags, and check
* if any of the locking request might need to block.
* The second time (either here, or in the async
* handler function) process the locks for real.
*/
save_offset = sr->smb_data.chain_offset;
for (i = 0; i < LockCount; i++) {
rc = smb_mbc_decodef(
&sr->smb_data, "qqll",
&elem.Offset, /* q */
&elem.Length, /* q */
&elem.Flags, /* l */
&elem.reserved); /* l */
if (rc) {
status = NT_STATUS_INVALID_PARAMETER;
goto errout;
}
/*
* Make sure the flags are valid;
* Find out if we might block.
*/
switch (elem.Flags) {
case SMB2_LOCKFLAG_SHARED_LOCK:
case SMB2_LOCKFLAG_EXCLUSIVE_LOCK:
MayBlock = B_TRUE;
break;
/* BEGIN CSTYLED */
case SMB2_LOCKFLAG_SHARED_LOCK |
SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
case SMB2_LOCKFLAG_EXCLUSIVE_LOCK |
SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
case SMB2_LOCKFLAG_UNLOCK:
/* END CSTYLED */
break;
default:
status = NT_STATUS_INVALID_PARAMETER;
goto errout;
}
}
if (MayBlock) {
/*
* May need to block. "Go async".
*/
status = smb2sr_go_async(sr, smb2_lock_async);
goto errout;
}
sr->smb_data.chain_offset = save_offset;
status = smb2_lock_exec(sr, LockCount);
if (status)
goto errout;
/*
* SMB2 Lock reply (sync)
*/
StructSize = 4;
(void) smb_mbc_encodef(
&sr->reply, "w..",
StructSize); /* w */
/* reserved .. */
return (SDRC_SUCCESS);
errout:
smb2sr_put_error(sr, status);
return (SDRC_SUCCESS);
}
static smb_sdrc_t
smb2_lock_async(smb_request_t *sr)
{
smb2fid_t smb2fid;
uint32_t LockSequence;
uint32_t status;
uint16_t StructSize;
uint16_t LockCount;
int rc = 0;
/*
* Decode the lock request again. It should all decode
* exactly the same as the first time we saw it. If not,
* report an "internal error".
*/
rc = smb_mbc_decodef(
&sr->smb_data, "wwlqq",
&StructSize, /* w */
&LockCount, /* w */
&LockSequence, /* l */
&smb2fid.persistent, /* q */
&smb2fid.temporal); /* q */
if (rc || StructSize != 48)
return (SDRC_ERROR);
status = smb2sr_lookup_fid(sr, &smb2fid);
if (status)
goto errout;
if (sr->fid_ofile->f_node == NULL || LockCount == 0) {
status = NT_STATUS_INTERNAL_ERROR;
goto errout;
}
status = smb2_lock_exec(sr, LockCount);
if (status)
goto errout;
/*
* SMB2 Lock reply (async)
*/
StructSize = 4;
(void) smb_mbc_encodef(
&sr->reply, "w..",
StructSize); /* w */
/* reserved .. */
return (SDRC_SUCCESS);
errout:
smb2sr_put_error(sr, status);
return (SDRC_SUCCESS);
}
/*
* Execute the vector of locks. This is the common function called by
* either the sync or async code paths. We've already decoded this
* request once when we get here, so if there are any decode errors
* then it's some kind of internal error.
*/
static uint32_t
smb2_lock_exec(smb_request_t *sr, uint16_t LockCount)
{
struct SMB2_LOCK_ELEMENT elem;
uint32_t status = 0;
uint16_t i;
int rc;
/*
* On entry, out position in the input data should be
* after both the SMB2 header and the fixed part of
* the SMB Lock request header (24).
*/
ASSERT(sr->smb_data.chain_offset ==
(sr->smb2_cmd_hdr + SMB2_HDR_SIZE + 24));
/*
* This is checked by our callers, but let's make sure.
*/
ASSERT(sr->fid_ofile->f_node != NULL);
for (i = 0; i < LockCount; i++) {
rc = smb_mbc_decodef(
&sr->smb_data, "qqll",
&elem.Offset, /* q */
&elem.Length, /* q */
&elem.Flags, /* l */
&elem.reserved); /* l */
if (rc) {
status = NT_STATUS_INTERNAL_ERROR;
break;
}
status = smb2_lock_elem(sr, &elem);
if (status)
break;
}
return (status);
}
static uint32_t
smb2_lock_elem(smb_request_t *sr, struct SMB2_LOCK_ELEMENT *elem)
{
smb_node_t *node = sr->fid_ofile->f_node;
uint32_t status;
uint32_t ltype;
uint32_t timeout = 0;
switch (elem->Flags) {
case SMB2_LOCKFLAG_SHARED_LOCK:
timeout = UINT_MAX;
/* FALLTHROUGH */
case SMB2_LOCKFLAG_SHARED_LOCK | SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
ltype = SMB_LOCK_TYPE_READONLY;
status = smb_lock_range(sr,
elem->Offset, elem->Length,
timeout, ltype);
break;
case SMB2_LOCKFLAG_EXCLUSIVE_LOCK:
timeout = UINT_MAX;
/* FALLTHROUGH */
case SMB2_LOCKFLAG_EXCLUSIVE_LOCK | SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
ltype = SMB_LOCK_TYPE_READWRITE;
status = smb_lock_range(sr,
elem->Offset, elem->Length,
timeout, ltype);
break;
case SMB2_LOCKFLAG_UNLOCK:
status = smb_unlock_range(sr, node,
elem->Offset, elem->Length);
break;
/*
* We've already checked the flags previously, so any
* surprises here are some kind of internal error.
*/
default:
status = NT_STATUS_INTERNAL_ERROR;
break;
}
return (status);
}
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