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cifssmb.c
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cifssmb.c
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/*
* fs/cifs/cifssmb.c
*
* Copyright (C) International Business Machines Corp., 2002,2005
* Author(s): Steve French ([email protected])
*
* Contains the routines for constructing the SMB PDUs themselves
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* SMB/CIFS PDU handling routines here - except for leftovers in connect.c */
/* These are mostly routines that operate on a pathname, or on a tree id */
/* (mounted volume), but there are eight handle based routines which must be */
/* treated slightly different for reconnection purposes since we never want */
/* to reuse a stale file handle and the caller knows the file handle */
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/vfs.h>
#include <linux/posix_acl_xattr.h>
#include <asm/uaccess.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifsacl.h"
#ifdef CONFIG_CIFS_POSIX
static struct {
int index;
char *name;
} protocols[] = {
{CIFS_PROT, "\2NT LM 0.12"},
{CIFS_PROT, "\2POSIX 2"},
{BAD_PROT, "\2"}
};
#else
static struct {
int index;
char *name;
} protocols[] = {
{CIFS_PROT, "\2NT LM 0.12"},
{BAD_PROT, "\2"}
};
#endif
/* Mark as invalid, all open files on tree connections since they
were closed when session to server was lost */
static void mark_open_files_invalid(struct cifsTconInfo * pTcon)
{
struct cifsFileInfo *open_file = NULL;
struct list_head * tmp;
struct list_head * tmp1;
/* list all files open on tree connection and mark them invalid */
write_lock(&GlobalSMBSeslock);
list_for_each_safe(tmp, tmp1, &pTcon->openFileList) {
open_file = list_entry(tmp,struct cifsFileInfo, tlist);
if(open_file) {
open_file->invalidHandle = TRUE;
}
}
write_unlock(&GlobalSMBSeslock);
/* BB Add call to invalidate_inodes(sb) for all superblocks mounted
to this tcon */
}
/* If the return code is zero, this function must fill in request_buf pointer */
static int
small_smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
void **request_buf /* returned */)
{
int rc = 0;
/* SMBs NegProt, SessSetup, uLogoff do not have tcon yet so
check for tcp and smb session status done differently
for those three - in the calling routine */
if(tcon) {
if(tcon->tidStatus == CifsExiting) {
/* only tree disconnect, open, and write,
(and ulogoff which does not have tcon)
are allowed as we start force umount */
if((smb_command != SMB_COM_WRITE_ANDX) &&
(smb_command != SMB_COM_OPEN_ANDX) &&
(smb_command != SMB_COM_TREE_DISCONNECT)) {
cFYI(1,("can not send cmd %d while umounting",
smb_command));
return -ENODEV;
}
}
if((tcon->ses) && (tcon->ses->status != CifsExiting) &&
(tcon->ses->server)){
struct nls_table *nls_codepage;
/* Give Demultiplex thread up to 10 seconds to
reconnect, should be greater than cifs socket
timeout which is 7 seconds */
while(tcon->ses->server->tcpStatus == CifsNeedReconnect) {
wait_event_interruptible_timeout(tcon->ses->server->response_q,
(tcon->ses->server->tcpStatus == CifsGood), 10 * HZ);
if(tcon->ses->server->tcpStatus == CifsNeedReconnect) {
/* on "soft" mounts we wait once */
if((tcon->retry == FALSE) ||
(tcon->ses->status == CifsExiting)) {
cFYI(1,("gave up waiting on reconnect in smb_init"));
return -EHOSTDOWN;
} /* else "hard" mount - keep retrying
until process is killed or server
comes back on-line */
} else /* TCP session is reestablished now */
break;
}
nls_codepage = load_nls_default();
/* need to prevent multiple threads trying to
simultaneously reconnect the same SMB session */
down(&tcon->ses->sesSem);
if(tcon->ses->status == CifsNeedReconnect)
rc = cifs_setup_session(0, tcon->ses,
nls_codepage);
if(!rc && (tcon->tidStatus == CifsNeedReconnect)) {
mark_open_files_invalid(tcon);
rc = CIFSTCon(0, tcon->ses, tcon->treeName, tcon
, nls_codepage);
up(&tcon->ses->sesSem);
/* BB FIXME add code to check if wsize needs
update due to negotiated smb buffer size
shrinking */
if(rc == 0)
atomic_inc(&tconInfoReconnectCount);
cFYI(1, ("reconnect tcon rc = %d", rc));
/* Removed call to reopen open files here -
it is safer (and faster) to reopen files
one at a time as needed in read and write */
/* Check if handle based operation so we
know whether we can continue or not without
returning to caller to reset file handle */
switch(smb_command) {
case SMB_COM_READ_ANDX:
case SMB_COM_WRITE_ANDX:
case SMB_COM_CLOSE:
case SMB_COM_FIND_CLOSE2:
case SMB_COM_LOCKING_ANDX: {
unload_nls(nls_codepage);
return -EAGAIN;
}
}
} else {
up(&tcon->ses->sesSem);
}
unload_nls(nls_codepage);
} else {
return -EIO;
}
}
if(rc)
return rc;
*request_buf = cifs_small_buf_get();
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
}
header_assemble((struct smb_hdr *) *request_buf, smb_command, tcon,wct);
if(tcon != NULL)
cifs_stats_inc(&tcon->num_smbs_sent);
return rc;
}
/* If the return code is zero, this function must fill in request_buf pointer */
static int
smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
void **request_buf /* returned */ ,
void **response_buf /* returned */ )
{
int rc = 0;
/* SMBs NegProt, SessSetup, uLogoff do not have tcon yet so
check for tcp and smb session status done differently
for those three - in the calling routine */
if(tcon) {
if(tcon->tidStatus == CifsExiting) {
/* only tree disconnect, open, and write,
(and ulogoff which does not have tcon)
are allowed as we start force umount */
if((smb_command != SMB_COM_WRITE_ANDX) &&
(smb_command != SMB_COM_OPEN_ANDX) &&
(smb_command != SMB_COM_TREE_DISCONNECT)) {
cFYI(1,("can not send cmd %d while umounting",
smb_command));
return -ENODEV;
}
}
if((tcon->ses) && (tcon->ses->status != CifsExiting) &&
(tcon->ses->server)){
struct nls_table *nls_codepage;
/* Give Demultiplex thread up to 10 seconds to
reconnect, should be greater than cifs socket
timeout which is 7 seconds */
while(tcon->ses->server->tcpStatus == CifsNeedReconnect) {
wait_event_interruptible_timeout(tcon->ses->server->response_q,
(tcon->ses->server->tcpStatus == CifsGood), 10 * HZ);
if(tcon->ses->server->tcpStatus ==
CifsNeedReconnect) {
/* on "soft" mounts we wait once */
if((tcon->retry == FALSE) ||
(tcon->ses->status == CifsExiting)) {
cFYI(1,("gave up waiting on reconnect in smb_init"));
return -EHOSTDOWN;
} /* else "hard" mount - keep retrying
until process is killed or server
comes on-line */
} else /* TCP session is reestablished now */
break;
}
nls_codepage = load_nls_default();
/* need to prevent multiple threads trying to
simultaneously reconnect the same SMB session */
down(&tcon->ses->sesSem);
if(tcon->ses->status == CifsNeedReconnect)
rc = cifs_setup_session(0, tcon->ses,
nls_codepage);
if(!rc && (tcon->tidStatus == CifsNeedReconnect)) {
mark_open_files_invalid(tcon);
rc = CIFSTCon(0, tcon->ses, tcon->treeName,
tcon, nls_codepage);
up(&tcon->ses->sesSem);
/* BB FIXME add code to check if wsize needs
update due to negotiated smb buffer size
shrinking */
if(rc == 0)
atomic_inc(&tconInfoReconnectCount);
cFYI(1, ("reconnect tcon rc = %d", rc));
/* Removed call to reopen open files here -
it is safer (and faster) to reopen files
one at a time as needed in read and write */
/* Check if handle based operation so we
know whether we can continue or not without
returning to caller to reset file handle */
switch(smb_command) {
case SMB_COM_READ_ANDX:
case SMB_COM_WRITE_ANDX:
case SMB_COM_CLOSE:
case SMB_COM_FIND_CLOSE2:
case SMB_COM_LOCKING_ANDX: {
unload_nls(nls_codepage);
return -EAGAIN;
}
}
} else {
up(&tcon->ses->sesSem);
}
unload_nls(nls_codepage);
} else {
return -EIO;
}
}
if(rc)
return rc;
*request_buf = cifs_buf_get();
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
}
/* Although the original thought was we needed the response buf for */
/* potential retries of smb operations it turns out we can determine */
/* from the mid flags when the request buffer can be resent without */
/* having to use a second distinct buffer for the response */
*response_buf = *request_buf;
header_assemble((struct smb_hdr *) *request_buf, smb_command, tcon,
wct /*wct */ );
if(tcon != NULL)
cifs_stats_inc(&tcon->num_smbs_sent);
return rc;
}
static int validate_t2(struct smb_t2_rsp * pSMB)
{
int rc = -EINVAL;
int total_size;
char * pBCC;
/* check for plausible wct, bcc and t2 data and parm sizes */
/* check for parm and data offset going beyond end of smb */
if(pSMB->hdr.WordCount >= 10) {
if((le16_to_cpu(pSMB->t2_rsp.ParameterOffset) <= 1024) &&
(le16_to_cpu(pSMB->t2_rsp.DataOffset) <= 1024)) {
/* check that bcc is at least as big as parms + data */
/* check that bcc is less than negotiated smb buffer */
total_size = le16_to_cpu(pSMB->t2_rsp.ParameterCount);
if(total_size < 512) {
total_size+=le16_to_cpu(pSMB->t2_rsp.DataCount);
/* BCC le converted in SendReceive */
pBCC = (pSMB->hdr.WordCount * 2) +
sizeof(struct smb_hdr) +
(char *)pSMB;
if((total_size <= (*(u16 *)pBCC)) &&
(total_size <
CIFSMaxBufSize+MAX_CIFS_HDR_SIZE)) {
return 0;
}
}
}
}
cifs_dump_mem("Invalid transact2 SMB: ",(char *)pSMB,
sizeof(struct smb_t2_rsp) + 16);
return rc;
}
int
CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
{
NEGOTIATE_REQ *pSMB;
NEGOTIATE_RSP *pSMBr;
int rc = 0;
int bytes_returned;
struct TCP_Server_Info * server;
u16 count;
if(ses->server)
server = ses->server;
else {
rc = -EIO;
return rc;
}
rc = smb_init(SMB_COM_NEGOTIATE, 0, NULL /* no tcon yet */ ,
(void **) &pSMB, (void **) &pSMBr);
if (rc)
return rc;
pSMB->hdr.Mid = GetNextMid(server);
pSMB->hdr.Flags2 |= SMBFLG2_UNICODE;
if (extended_security)
pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
count = strlen(protocols[0].name) + 1;
strncpy(pSMB->DialectsArray, protocols[0].name, 30);
/* null guaranteed to be at end of source and target buffers anyway */
pSMB->hdr.smb_buf_length += count;
pSMB->ByteCount = cpu_to_le16(count);
rc = SendReceive(xid, ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
if (rc == 0) {
server->secMode = pSMBr->SecurityMode;
if((server->secMode & SECMODE_USER) == 0)
cFYI(1,("share mode security"));
server->secType = NTLM; /* BB override default for
NTLMv2 or kerberos v5 */
/* one byte - no need to convert this or EncryptionKeyLen
from little endian */
server->maxReq = le16_to_cpu(pSMBr->MaxMpxCount);
/* probably no need to store and check maxvcs */
server->maxBuf =
min(le32_to_cpu(pSMBr->MaxBufferSize),
(__u32) CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
server->maxRw = le32_to_cpu(pSMBr->MaxRawSize);
cFYI(0, ("Max buf = %d", ses->server->maxBuf));
GETU32(ses->server->sessid) = le32_to_cpu(pSMBr->SessionKey);
server->capabilities = le32_to_cpu(pSMBr->Capabilities);
server->timeZone = le16_to_cpu(pSMBr->ServerTimeZone);
/* BB with UTC do we ever need to be using srvr timezone? */
if (pSMBr->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE) {
memcpy(server->cryptKey, pSMBr->u.EncryptionKey,
CIFS_CRYPTO_KEY_SIZE);
} else if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC)
&& (pSMBr->EncryptionKeyLength == 0)) {
/* decode security blob */
} else
rc = -EIO;
/* BB might be helpful to save off the domain of server here */
if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC) &&
(server->capabilities & CAP_EXTENDED_SECURITY)) {
count = pSMBr->ByteCount;
if (count < 16)
rc = -EIO;
else if (count == 16) {
server->secType = RawNTLMSSP;
if (server->socketUseCount.counter > 1) {
if (memcmp
(server->server_GUID,
pSMBr->u.extended_response.
GUID, 16) != 0) {
cFYI(1, ("server UID changed"));
memcpy(server->
server_GUID,
pSMBr->u.
extended_response.
GUID, 16);
}
} else
memcpy(server->server_GUID,
pSMBr->u.extended_response.
GUID, 16);
} else {
rc = decode_negTokenInit(pSMBr->u.
extended_response.
SecurityBlob,
count - 16,
&server->secType);
if(rc == 1) {
/* BB Need to fill struct for sessetup here */
rc = -EOPNOTSUPP;
} else {
rc = -EINVAL;
}
}
} else
server->capabilities &= ~CAP_EXTENDED_SECURITY;
if(sign_CIFS_PDUs == FALSE) {
if(server->secMode & SECMODE_SIGN_REQUIRED)
cERROR(1,
("Server requires /proc/fs/cifs/PacketSigningEnabled"));
server->secMode &= ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
} else if(sign_CIFS_PDUs == 1) {
if((server->secMode & SECMODE_SIGN_REQUIRED) == 0)
server->secMode &= ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
}
}
cifs_buf_release(pSMB);
return rc;
}
int
CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
{
struct smb_hdr *smb_buffer;
struct smb_hdr *smb_buffer_response; /* BB removeme BB */
int rc = 0;
int length;
cFYI(1, ("In tree disconnect"));
/*
* If last user of the connection and
* connection alive - disconnect it
* If this is the last connection on the server session disconnect it
* (and inside session disconnect we should check if tcp socket needs
* to be freed and kernel thread woken up).
*/
if (tcon)
down(&tcon->tconSem);
else
return -EIO;
atomic_dec(&tcon->useCount);
if (atomic_read(&tcon->useCount) > 0) {
up(&tcon->tconSem);
return -EBUSY;
}
/* No need to return error on this operation if tid invalidated and
closed on server already e.g. due to tcp session crashing */
if(tcon->tidStatus == CifsNeedReconnect) {
up(&tcon->tconSem);
return 0;
}
if((tcon->ses == NULL) || (tcon->ses->server == NULL)) {
up(&tcon->tconSem);
return -EIO;
}
rc = small_smb_init(SMB_COM_TREE_DISCONNECT, 0, tcon,
(void **)&smb_buffer);
if (rc) {
up(&tcon->tconSem);
return rc;
} else {
smb_buffer_response = smb_buffer; /* BB removeme BB */
}
rc = SendReceive(xid, tcon->ses, smb_buffer, smb_buffer_response,
&length, 0);
if (rc)
cFYI(1, ("Tree disconnect failed %d", rc));
if (smb_buffer)
cifs_small_buf_release(smb_buffer);
up(&tcon->tconSem);
/* No need to return error on this operation if tid invalidated and
closed on server already e.g. due to tcp session crashing */
if (rc == -EAGAIN)
rc = 0;
return rc;
}
int
CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
{
struct smb_hdr *smb_buffer_response;
LOGOFF_ANDX_REQ *pSMB;
int rc = 0;
int length;
cFYI(1, ("In SMBLogoff for session disconnect"));
if (ses)
down(&ses->sesSem);
else
return -EIO;
atomic_dec(&ses->inUse);
if (atomic_read(&ses->inUse) > 0) {
up(&ses->sesSem);
return -EBUSY;
}
rc = small_smb_init(SMB_COM_LOGOFF_ANDX, 2, NULL, (void **)&pSMB);
if (rc) {
up(&ses->sesSem);
return rc;
}
smb_buffer_response = (struct smb_hdr *)pSMB; /* BB removeme BB */
if(ses->server) {
pSMB->hdr.Mid = GetNextMid(ses->server);
if(ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
pSMB->hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
}
pSMB->hdr.Uid = ses->Suid;
pSMB->AndXCommand = 0xFF;
rc = SendReceive(xid, ses, (struct smb_hdr *) pSMB,
smb_buffer_response, &length, 0);
if (ses->server) {
atomic_dec(&ses->server->socketUseCount);
if (atomic_read(&ses->server->socketUseCount) == 0) {
spin_lock(&GlobalMid_Lock);
ses->server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
rc = -ESHUTDOWN;
}
}
up(&ses->sesSem);
cifs_small_buf_release(pSMB);
/* if session dead then we do not need to do ulogoff,
since server closed smb session, no sense reporting
error */
if (rc == -EAGAIN)
rc = 0;
return rc;
}
int
CIFSSMBDelFile(const int xid, struct cifsTconInfo *tcon, const char *fileName,
const struct nls_table *nls_codepage, int remap)
{
DELETE_FILE_REQ *pSMB = NULL;
DELETE_FILE_RSP *pSMBr = NULL;
int rc = 0;
int bytes_returned;
int name_len;
DelFileRetry:
rc = smb_init(SMB_COM_DELETE, 1, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len =
cifsConvertToUCS((__le16 *) pSMB->fileName, fileName,
PATH_MAX, nls_codepage, remap);
name_len++; /* trailing null */
name_len *= 2;
} else { /* BB improve check for buffer overruns BB */
name_len = strnlen(fileName, PATH_MAX);
name_len++; /* trailing null */
strncpy(pSMB->fileName, fileName, name_len);
}
pSMB->SearchAttributes =
cpu_to_le16(ATTR_READONLY | ATTR_HIDDEN | ATTR_SYSTEM);
pSMB->BufferFormat = 0x04;
pSMB->hdr.smb_buf_length += name_len + 1;
pSMB->ByteCount = cpu_to_le16(name_len + 1);
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
cifs_stats_inc(&tcon->num_deletes);
if (rc) {
cFYI(1, ("Error in RMFile = %d", rc));
}
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
goto DelFileRetry;
return rc;
}
int
CIFSSMBRmDir(const int xid, struct cifsTconInfo *tcon, const char *dirName,
const struct nls_table *nls_codepage, int remap)
{
DELETE_DIRECTORY_REQ *pSMB = NULL;
DELETE_DIRECTORY_RSP *pSMBr = NULL;
int rc = 0;
int bytes_returned;
int name_len;
cFYI(1, ("In CIFSSMBRmDir"));
RmDirRetry:
rc = smb_init(SMB_COM_DELETE_DIRECTORY, 0, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len = cifsConvertToUCS((__le16 *) pSMB->DirName, dirName,
PATH_MAX, nls_codepage, remap);
name_len++; /* trailing null */
name_len *= 2;
} else { /* BB improve check for buffer overruns BB */
name_len = strnlen(dirName, PATH_MAX);
name_len++; /* trailing null */
strncpy(pSMB->DirName, dirName, name_len);
}
pSMB->BufferFormat = 0x04;
pSMB->hdr.smb_buf_length += name_len + 1;
pSMB->ByteCount = cpu_to_le16(name_len + 1);
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
cifs_stats_inc(&tcon->num_rmdirs);
if (rc) {
cFYI(1, ("Error in RMDir = %d", rc));
}
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
goto RmDirRetry;
return rc;
}
int
CIFSSMBMkDir(const int xid, struct cifsTconInfo *tcon,
const char *name, const struct nls_table *nls_codepage, int remap)
{
int rc = 0;
CREATE_DIRECTORY_REQ *pSMB = NULL;
CREATE_DIRECTORY_RSP *pSMBr = NULL;
int bytes_returned;
int name_len;
cFYI(1, ("In CIFSSMBMkDir"));
MkDirRetry:
rc = smb_init(SMB_COM_CREATE_DIRECTORY, 0, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
name_len = cifsConvertToUCS((__le16 *) pSMB->DirName, name,
PATH_MAX, nls_codepage, remap);
name_len++; /* trailing null */
name_len *= 2;
} else { /* BB improve check for buffer overruns BB */
name_len = strnlen(name, PATH_MAX);
name_len++; /* trailing null */
strncpy(pSMB->DirName, name, name_len);
}
pSMB->BufferFormat = 0x04;
pSMB->hdr.smb_buf_length += name_len + 1;
pSMB->ByteCount = cpu_to_le16(name_len + 1);
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 0);
cifs_stats_inc(&tcon->num_mkdirs);
if (rc) {
cFYI(1, ("Error in Mkdir = %d", rc));
}
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
goto MkDirRetry;
return rc;
}
static __u16 convert_disposition(int disposition)
{
__u16 ofun = 0;
switch (disposition) {
case FILE_SUPERSEDE:
ofun = SMBOPEN_OCREATE | SMBOPEN_OTRUNC;
break;
case FILE_OPEN:
ofun = SMBOPEN_OAPPEND;
break;
case FILE_CREATE:
ofun = SMBOPEN_OCREATE;
break;
case FILE_OPEN_IF:
ofun = SMBOPEN_OCREATE | SMBOPEN_OAPPEND;
break;
case FILE_OVERWRITE:
ofun = SMBOPEN_OTRUNC;
break;
case FILE_OVERWRITE_IF:
ofun = SMBOPEN_OCREATE | SMBOPEN_OTRUNC;
break;
default:
cFYI(1,("unknown disposition %d",disposition));
ofun = SMBOPEN_OAPPEND; /* regular open */
}
return ofun;
}
int
SMBLegacyOpen(const int xid, struct cifsTconInfo *tcon,
const char *fileName, const int openDisposition,
const int access_flags, const int create_options, __u16 * netfid,
int *pOplock, FILE_ALL_INFO * pfile_info,
const struct nls_table *nls_codepage, int remap)
{
int rc = -EACCES;
OPENX_REQ *pSMB = NULL;
OPENX_RSP *pSMBr = NULL;
int bytes_returned;
int name_len;
__u16 count;
OldOpenRetry:
rc = smb_init(SMB_COM_OPEN_ANDX, 15, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
pSMB->AndXCommand = 0xFF; /* none */
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
count = 1; /* account for one byte pad to word boundary */
name_len =
cifsConvertToUCS((__le16 *) (pSMB->fileName + 1),
fileName, PATH_MAX, nls_codepage, remap);
name_len++; /* trailing null */
name_len *= 2;
} else { /* BB improve check for buffer overruns BB */
count = 0; /* no pad */
name_len = strnlen(fileName, PATH_MAX);
name_len++; /* trailing null */
strncpy(pSMB->fileName, fileName, name_len);
}
if (*pOplock & REQ_OPLOCK)
pSMB->OpenFlags = cpu_to_le16(REQ_OPLOCK);
else if (*pOplock & REQ_BATCHOPLOCK) {
pSMB->OpenFlags = cpu_to_le16(REQ_BATCHOPLOCK);
}
pSMB->OpenFlags |= cpu_to_le16(REQ_MORE_INFO);
/* BB fixme add conversion for access_flags to bits 0 - 2 of mode */
/* 0 = read
1 = write
2 = rw
3 = execute
*/
pSMB->Mode = cpu_to_le16(2);
pSMB->Mode |= cpu_to_le16(0x40); /* deny none */
/* set file as system file if special file such
as fifo and server expecting SFU style and
no Unix extensions */
if(create_options & CREATE_OPTION_SPECIAL)
pSMB->FileAttributes = cpu_to_le16(ATTR_SYSTEM);
else
pSMB->FileAttributes = cpu_to_le16(0/*ATTR_NORMAL*/); /* BB FIXME */
/* if ((omode & S_IWUGO) == 0)
pSMB->FileAttributes |= cpu_to_le32(ATTR_READONLY);*/
/* Above line causes problems due to vfs splitting create into two
pieces - need to set mode after file created not while it is
being created */
/* BB FIXME BB */
/* pSMB->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK); */
/* BB FIXME END BB */
pSMB->Sattr = cpu_to_le16(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_DIRECTORY);
pSMB->OpenFunction = cpu_to_le16(convert_disposition(openDisposition));
count += name_len;
pSMB->hdr.smb_buf_length += count;
pSMB->ByteCount = cpu_to_le16(count);
/* long_op set to 1 to allow for oplock break timeouts */
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 1);
cifs_stats_inc(&tcon->num_opens);
if (rc) {
cFYI(1, ("Error in Open = %d", rc));
} else {
/* BB verify if wct == 15 */
/* *pOplock = pSMBr->OplockLevel; */ /* BB take from action field BB */
*netfid = pSMBr->Fid; /* cifs fid stays in le */
/* Let caller know file was created so we can set the mode. */
/* Do we care about the CreateAction in any other cases? */
/* BB FIXME BB */
/* if(cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
*pOplock |= CIFS_CREATE_ACTION; */
/* BB FIXME END */
if(pfile_info) {
pfile_info->CreationTime = 0; /* BB convert CreateTime*/
pfile_info->LastAccessTime = 0; /* BB fixme */
pfile_info->LastWriteTime = 0; /* BB fixme */
pfile_info->ChangeTime = 0; /* BB fixme */
pfile_info->Attributes =
cpu_to_le32(le16_to_cpu(pSMBr->FileAttributes));
/* the file_info buf is endian converted by caller */
pfile_info->AllocationSize =
cpu_to_le64(le32_to_cpu(pSMBr->EndOfFile));
pfile_info->EndOfFile = pfile_info->AllocationSize;
pfile_info->NumberOfLinks = cpu_to_le32(1);
}
}
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
goto OldOpenRetry;
return rc;
}
int
CIFSSMBOpen(const int xid, struct cifsTconInfo *tcon,
const char *fileName, const int openDisposition,
const int access_flags, const int create_options, __u16 * netfid,
int *pOplock, FILE_ALL_INFO * pfile_info,
const struct nls_table *nls_codepage, int remap)
{
int rc = -EACCES;
OPEN_REQ *pSMB = NULL;
OPEN_RSP *pSMBr = NULL;
int bytes_returned;
int name_len;
__u16 count;
openRetry:
rc = smb_init(SMB_COM_NT_CREATE_ANDX, 24, tcon, (void **) &pSMB,
(void **) &pSMBr);
if (rc)
return rc;
pSMB->AndXCommand = 0xFF; /* none */
if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
count = 1; /* account for one byte pad to word boundary */
name_len =
cifsConvertToUCS((__le16 *) (pSMB->fileName + 1),
fileName, PATH_MAX, nls_codepage, remap);
name_len++; /* trailing null */
name_len *= 2;
pSMB->NameLength = cpu_to_le16(name_len);
} else { /* BB improve check for buffer overruns BB */
count = 0; /* no pad */
name_len = strnlen(fileName, PATH_MAX);
name_len++; /* trailing null */
pSMB->NameLength = cpu_to_le16(name_len);
strncpy(pSMB->fileName, fileName, name_len);
}
if (*pOplock & REQ_OPLOCK)
pSMB->OpenFlags = cpu_to_le32(REQ_OPLOCK);
else if (*pOplock & REQ_BATCHOPLOCK) {
pSMB->OpenFlags = cpu_to_le32(REQ_BATCHOPLOCK);
}
pSMB->DesiredAccess = cpu_to_le32(access_flags);
pSMB->AllocationSize = 0;
/* set file as system file if special file such
as fifo and server expecting SFU style and
no Unix extensions */
if(create_options & CREATE_OPTION_SPECIAL)
pSMB->FileAttributes = cpu_to_le32(ATTR_SYSTEM);
else
pSMB->FileAttributes = cpu_to_le32(ATTR_NORMAL);
/* XP does not handle ATTR_POSIX_SEMANTICS */
/* but it helps speed up case sensitive checks for other
servers such as Samba */
if (tcon->ses->capabilities & CAP_UNIX)
pSMB->FileAttributes |= cpu_to_le32(ATTR_POSIX_SEMANTICS);
/* if ((omode & S_IWUGO) == 0)
pSMB->FileAttributes |= cpu_to_le32(ATTR_READONLY);*/
/* Above line causes problems due to vfs splitting create into two
pieces - need to set mode after file created not while it is
being created */
pSMB->ShareAccess = cpu_to_le32(FILE_SHARE_ALL);
pSMB->CreateDisposition = cpu_to_le32(openDisposition);
pSMB->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK);
/* BB Expirement with various impersonation levels and verify */
pSMB->ImpersonationLevel = cpu_to_le32(SECURITY_IMPERSONATION);
pSMB->SecurityFlags =
SECURITY_CONTEXT_TRACKING | SECURITY_EFFECTIVE_ONLY;
count += name_len;
pSMB->hdr.smb_buf_length += count;
pSMB->ByteCount = cpu_to_le16(count);
/* long_op set to 1 to allow for oplock break timeouts */
rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
(struct smb_hdr *) pSMBr, &bytes_returned, 1);
cifs_stats_inc(&tcon->num_opens);
if (rc) {
cFYI(1, ("Error in Open = %d", rc));
} else {
*pOplock = pSMBr->OplockLevel; /* 1 byte no need to le_to_cpu */
*netfid = pSMBr->Fid; /* cifs fid stays in le */
/* Let caller know file was created so we can set the mode. */
/* Do we care about the CreateAction in any other cases? */
if(cpu_to_le32(FILE_CREATE) == pSMBr->CreateAction)
*pOplock |= CIFS_CREATE_ACTION;
if(pfile_info) {
memcpy((char *)pfile_info,(char *)&pSMBr->CreationTime,
36 /* CreationTime to Attributes */);
/* the file_info buf is endian converted by caller */
pfile_info->AllocationSize = pSMBr->AllocationSize;
pfile_info->EndOfFile = pSMBr->EndOfFile;
pfile_info->NumberOfLinks = cpu_to_le32(1);
}
}
cifs_buf_release(pSMB);
if (rc == -EAGAIN)
goto openRetry;
return rc;
}
int
CIFSSMBRead(const int xid, struct cifsTconInfo *tcon,
const int netfid, const unsigned int count,
const __u64 lseek, unsigned int *nbytes, char **buf,
int * pbuf_type)
{
int rc = -EACCES;
READ_REQ *pSMB = NULL;
READ_RSP *pSMBr = NULL;
char *pReadData = NULL;
int wct;
int resp_buf_type = 0;
struct kvec iov[1];
cFYI(1,("Reading %d bytes on fid %d",count,netfid));
if(tcon->ses->capabilities & CAP_LARGE_FILES)
wct = 12;
else
wct = 10; /* old style read */
*nbytes = 0;
rc = small_smb_init(SMB_COM_READ_ANDX, wct, tcon, (void **) &pSMB);
if (rc)
return rc;
/* tcon and ses pointer are checked in smb_init */
if (tcon->ses->server == NULL)
return -ECONNABORTED;
pSMB->AndXCommand = 0xFF; /* none */
pSMB->Fid = netfid;
pSMB->OffsetLow = cpu_to_le32(lseek & 0xFFFFFFFF);
if(wct == 12)
pSMB->OffsetHigh = cpu_to_le32(lseek >> 32);
else if((lseek >> 32) > 0) /* can not handle this big offset for old */
return -EIO;
pSMB->Remaining = 0;