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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., 2002,2006
* 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[] = {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
{LANMAN_PROT, "\2LM1.2X002"},
{LANMAN2_PROT, "\2LANMAN2.1"},
#endif /* weak password hashing for legacy clients */
{CIFS_PROT, "\2NT LM 0.12"},
{POSIX_PROT, "\2POSIX 2"},
{BAD_PROT, "\2"}
};
#else
static struct {
int index;
char *name;
} protocols[] = {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
{LANMAN_PROT, "\2LM1.2X002"},
{LANMAN2_PROT, "\2LANMAN2.1"},
#endif /* weak password hashing for legacy clients */
{CIFS_PROT, "\2NT LM 0.12"},
{BAD_PROT, "\2"}
};
#endif
/* define the number of elements in the cifs dialect array */
#ifdef CONFIG_CIFS_POSIX
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFS_NUM_PROT 4
#else
#define CIFS_NUM_PROT 2
#endif /* CIFS_WEAK_PW_HASH */
#else /* not posix */
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFS_NUM_PROT 3
#else
#define CIFS_NUM_PROT 1
#endif /* CONFIG_CIFS_WEAK_PW_HASH */
#endif /* CIFS_POSIX */
/* 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);
/* tell server which Unix caps we support */
if (tcon->ses->capabilities & CAP_UNIX)
reset_cifs_unix_caps(0 /* no xid */,
tcon,
NULL /* we do not know sb */,
NULL /* no vol info */);
/* 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;
}
int
small_smb_init_no_tc(const int smb_command, const int wct,
struct cifsSesInfo *ses, void **request_buf)
{
int rc;
struct smb_hdr * buffer;
rc = small_smb_init(smb_command, wct, NULL, request_buf);
if(rc)
return rc;
buffer = (struct smb_hdr *)*request_buf;
buffer->Mid = GetNextMid(ses->server);
if (ses->capabilities & CAP_UNICODE)
buffer->Flags2 |= SMBFLG2_UNICODE;
if (ses->capabilities & CAP_STATUS32)
buffer->Flags2 |= SMBFLG2_ERR_STATUS;
/* uid, tid can stay at zero as set in header assemble */
/* BB add support for turning on the signing when
this function is used after 1st of session setup requests */
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);
/* tell server which Unix caps we support */
if (tcon->ses->capabilities & CAP_UNIX)
reset_cifs_unix_caps(0 /* no xid */,
tcon,
NULL /* do not know sb */,
NULL /* no vol info */);
/* 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 */
if(response_buf)
*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;
int i;
struct TCP_Server_Info * server;
u16 count;
unsigned int secFlags;
u16 dialect;
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;
/* if any of auth flags (ie not sign or seal) are overriden use them */
if(ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
secFlags = ses->overrideSecFlg;
else /* if override flags set only sign/seal OR them with global auth */
secFlags = extended_security | ses->overrideSecFlg;
cFYI(1,("secFlags 0x%x",secFlags));
pSMB->hdr.Mid = GetNextMid(server);
pSMB->hdr.Flags2 |= SMBFLG2_UNICODE;
if((secFlags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
count = 0;
for(i=0;i<CIFS_NUM_PROT;i++) {
strncpy(pSMB->DialectsArray+count, protocols[i].name, 16);
count += strlen(protocols[i].name) + 1;
/* null 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)
goto neg_err_exit;
dialect = le16_to_cpu(pSMBr->DialectIndex);
cFYI(1,("Dialect: %d", dialect));
/* Check wct = 1 error case */
if((pSMBr->hdr.WordCount < 13) || (dialect == BAD_PROT)) {
/* core returns wct = 1, but we do not ask for core - otherwise
small wct just comes when dialect index is -1 indicating we
could not negotiate a common dialect */
rc = -EOPNOTSUPP;
goto neg_err_exit;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
} else if((pSMBr->hdr.WordCount == 13)
&& ((dialect == LANMAN_PROT)
|| (dialect == LANMAN2_PROT))) {
__s16 tmp;
struct lanman_neg_rsp * rsp = (struct lanman_neg_rsp *)pSMBr;
if((secFlags & CIFSSEC_MAY_LANMAN) ||
(secFlags & CIFSSEC_MAY_PLNTXT))
server->secType = LANMAN;
else {
cERROR(1, ("mount failed weak security disabled"
" in /proc/fs/cifs/SecurityFlags"));
rc = -EOPNOTSUPP;
goto neg_err_exit;
}
server->secMode = (__u8)le16_to_cpu(rsp->SecurityMode);
server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),
(__u32)CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
GETU32(server->sessid) = le32_to_cpu(rsp->SessionKey);
/* even though we do not use raw we might as well set this
accurately, in case we ever find a need for it */
if((le16_to_cpu(rsp->RawMode) & RAW_ENABLE) == RAW_ENABLE) {
server->maxRw = 0xFF00;
server->capabilities = CAP_MPX_MODE | CAP_RAW_MODE;
} else {
server->maxRw = 0;/* we do not need to use raw anyway */
server->capabilities = CAP_MPX_MODE;
}
tmp = (__s16)le16_to_cpu(rsp->ServerTimeZone);
if (tmp == -1) {
/* OS/2 often does not set timezone therefore
* we must use server time to calc time zone.
* Could deviate slightly from the right zone.
* Smallest defined timezone difference is 15 minutes
* (i.e. Nepal). Rounding up/down is done to match
* this requirement.
*/
int val, seconds, remain, result;
struct timespec ts, utc;
utc = CURRENT_TIME;
ts = cnvrtDosUnixTm(le16_to_cpu(rsp->SrvTime.Date),
le16_to_cpu(rsp->SrvTime.Time));
cFYI(1,("SrvTime: %d sec since 1970 (utc: %d) diff: %d",
(int)ts.tv_sec, (int)utc.tv_sec,
(int)(utc.tv_sec - ts.tv_sec)));
val = (int)(utc.tv_sec - ts.tv_sec);
seconds = val < 0 ? -val : val;
result = (seconds / MIN_TZ_ADJ) * MIN_TZ_ADJ;
remain = seconds % MIN_TZ_ADJ;
if(remain >= (MIN_TZ_ADJ / 2))
result += MIN_TZ_ADJ;
if(val < 0)
result = - result;
server->timeAdj = result;
} else {
server->timeAdj = (int)tmp;
server->timeAdj *= 60; /* also in seconds */
}
cFYI(1,("server->timeAdj: %d seconds", server->timeAdj));
/* BB get server time for time conversions and add
code to use it and timezone since this is not UTC */
if (rsp->EncryptionKeyLength ==
cpu_to_le16(CIFS_CRYPTO_KEY_SIZE)) {
memcpy(server->cryptKey, rsp->EncryptionKey,
CIFS_CRYPTO_KEY_SIZE);
} else if (server->secMode & SECMODE_PW_ENCRYPT) {
rc = -EIO; /* need cryptkey unless plain text */
goto neg_err_exit;
}
cFYI(1,("LANMAN negotiated"));
/* we will not end up setting signing flags - as no signing
was in LANMAN and server did not return the flags on */
goto signing_check;
#else /* weak security disabled */
} else if(pSMBr->hdr.WordCount == 13) {
cERROR(1,("mount failed, cifs module not built "
"with CIFS_WEAK_PW_HASH support"));
rc = -EOPNOTSUPP;
#endif /* WEAK_PW_HASH */
goto neg_err_exit;
} else if(pSMBr->hdr.WordCount != 17) {
/* unknown wct */
rc = -EOPNOTSUPP;
goto neg_err_exit;
}
/* else wct == 17 NTLM */
server->secMode = pSMBr->SecurityMode;
if((server->secMode & SECMODE_USER) == 0)
cFYI(1,("share mode security"));
if((server->secMode & SECMODE_PW_ENCRYPT) == 0)
#ifdef CONFIG_CIFS_WEAK_PW_HASH
if ((secFlags & CIFSSEC_MAY_PLNTXT) == 0)
#endif /* CIFS_WEAK_PW_HASH */
cERROR(1,("Server requests plain text password"
" but client support disabled"));
if((secFlags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
server->secType = NTLMv2;
else if(secFlags & CIFSSEC_MAY_NTLM)
server->secType = NTLM;
else if(secFlags & CIFSSEC_MAY_NTLMV2)
server->secType = NTLMv2;
/* else krb5 ... any others ... */
/* one byte, so 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->timeAdj = (int)(__s16)le16_to_cpu(pSMBr->ServerTimeZone);
server->timeAdj *= 60;
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 if (server->secMode & SECMODE_PW_ENCRYPT) {
rc = -EIO; /* no crypt key only if plain text pwd */
goto neg_err_exit;
}
/* 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;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
signing_check:
#endif
if(sign_CIFS_PDUs == FALSE) {
if(server->secMode & SECMODE_SIGN_REQUIRED)
cERROR(1,("Server requires "
"/proc/fs/cifs/PacketSigningEnabled to be on"));
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);
} else if(sign_CIFS_PDUs == 2) {
if((server->secMode &
(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
cERROR(1,("signing required but server lacks support"));
}
}
neg_err_exit:
cifs_buf_release(pSMB);
cFYI(1,("negprot rc %d",rc));
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);