/*
* An NT cancel request header looks just like the original request except:
*
* The Command is SMB_COM_NT_CANCEL
* The WordCount is zeroed out
* The ByteCount is zeroed out
*
* This function mangles an existing request buffer into a
* SMB_COM_NT_CANCEL request and then sends it.
*/
static int
send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
struct mid_q_entry *mid)
{
int rc = 0;
/* -4 for RFC1001 length and +2 for BCC field */
in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
in_buf->Command = SMB_COM_NT_CANCEL;
in_buf->WordCount = 0;
put_bcc(0, in_buf);
mutex_lock(&server->srv_mutex);
rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
if (rc) {
mutex_unlock(&server->srv_mutex);
return rc;
}
/*
* The response to this call was already factored into the sequence
* number when the call went out, so we must adjust it back downward
* after signing here.
*/
--server->sequence_number;
rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
mutex_unlock(&server->srv_mutex);
cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
in_buf->Mid, rc);
return rc;
}
/*
* An NT cancel request header looks just like the original request except:
*
* The Command is SMB_COM_NT_CANCEL
* The WordCount is zeroed out
* The ByteCount is zeroed out
*
* This function mangles an existing request buffer into a
* SMB_COM_NT_CANCEL request and then sends it.
*/
static int
send_nt_cancel(struct TCP_Server_Info *server, struct smb_hdr *in_buf,
struct mid_q_entry *mid)
{
int rc = 0;
/* -4 for RFC1001 length and +2 for BCC field */
in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);
in_buf->Command = SMB_COM_NT_CANCEL;
in_buf->WordCount = 0;
put_bcc(0, in_buf);
mutex_lock(&server->srv_mutex);
rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);
if (rc) {
mutex_unlock(&server->srv_mutex);
return rc;
}
rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
mutex_unlock(&server->srv_mutex);
cFYI(1, "issued NT_CANCEL for mid %u, rc = %d",
in_buf->Mid, rc);
return rc;
}
static int
sess_sendreceive(struct sess_data *sess_data)
{
int rc;
struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
__u16 count;
count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
smb_buf->smb_buf_length =
cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
put_bcc(count, smb_buf);
rc = SendReceive2(sess_data->xid, sess_data->ses,
sess_data->iov, 3 /* num_iovecs */,
&sess_data->buf0_type,
CIFS_LOG_ERROR);
return rc;
}
int
CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
int rc = 0;
int wct;
struct smb_hdr *smb_buf;
char *bcc_ptr;
char *str_area;
SESSION_SETUP_ANDX *pSMB;
__u32 capabilities;
__u16 count;
int resp_buf_type;
struct kvec iov[3];
enum securityEnum type;
__u16 action, bytes_remaining;
struct key *spnego_key = NULL;
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
u16 blob_len;
char *ntlmsspblob = NULL;
if (ses == NULL) {
WARN(1, "%s: ses == NULL!", __func__);
return -EINVAL;
}
type = select_sectype(ses->server, ses->sectype);
cifs_dbg(FYI, "sess setup type %d\n", type);
if (type == Unspecified) {
cifs_dbg(VFS,
"Unable to select appropriate authentication method!");
return -EINVAL;
}
if (type == RawNTLMSSP) {
/* if memory allocation is successful, caller of this function
* frees it.
*/
ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
if (!ses->ntlmssp)
return -ENOMEM;
ses->ntlmssp->sesskey_per_smbsess = false;
}
ssetup_ntlmssp_authenticate:
if (phase == NtLmChallenge)
phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
if (type == LANMAN) {
#ifndef CONFIG_CIFS_WEAK_PW_HASH
/* LANMAN and plaintext are less secure and off by default.
So we make this explicitly be turned on in kconfig (in the
build) and turned on at runtime (changed from the default)
in proc/fs/cifs or via mount parm. Unfortunately this is
needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
return -EOPNOTSUPP;
#endif
wct = 10; /* lanman 2 style sessionsetup */
} else if ((type == NTLM) || (type == NTLMv2)) {
/* For NTLMv2 failures eventually may need to retry NTLM */
wct = 13; /* old style NTLM sessionsetup */
} else /* same size: negotiate or auth, NTLMSSP or extended security */
wct = 12;
rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
(void **)&smb_buf);
if (rc)
return rc;
pSMB = (SESSION_SETUP_ANDX *)smb_buf;
capabilities = cifs_ssetup_hdr(ses, pSMB);
/* we will send the SMB in three pieces:
a fixed length beginning part, an optional
SPNEGO blob (which can be zero length), and a
last part which will include the strings
and rest of bcc area. This allows us to avoid
a large buffer 17K allocation */
iov[0].iov_base = (char *)pSMB;
iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
/* setting this here allows the code at the end of the function
to free the request buffer if there's an error */
resp_buf_type = CIFS_SMALL_BUFFER;
/* 2000 big enough to fit max user, domain, NOS name etc. */
str_area = kmalloc(2000, GFP_KERNEL);
if (str_area == NULL) {
rc = -ENOMEM;
goto ssetup_exit;
}
bcc_ptr = str_area;
iov[1].iov_base = NULL;
iov[1].iov_len = 0;
if (type == LANMAN) {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
char lnm_session_key[CIFS_AUTH_RESP_SIZE];
pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
/* no capabilities flags in old lanman negotiation */
pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
/* Calculate hash with password and copy into bcc_ptr.
* Encryption Key (stored as in cryptkey) gets used if the
* security mode bit in Negottiate Protocol response states
* to use challenge/response method (i.e. Password bit is 1).
*/
rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
true : false, lnm_session_key);
memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
bcc_ptr += CIFS_AUTH_RESP_SIZE;
/* can not sign if LANMAN negotiated so no need
to calculate signing key? but what if server
changed to do higher than lanman dialect and
we reconnected would we ever calc signing_key? */
cifs_dbg(FYI, "Negotiating LANMAN setting up strings\n");
/* Unicode not allowed for LANMAN dialects */
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
#endif
} else if (type == NTLM) {
pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
pSMB->req_no_secext.CaseInsensitivePasswordLength =
cpu_to_le16(CIFS_AUTH_RESP_SIZE);
pSMB->req_no_secext.CaseSensitivePasswordLength =
cpu_to_le16(CIFS_AUTH_RESP_SIZE);
/* calculate ntlm response and session key */
rc = setup_ntlm_response(ses, nls_cp);
if (rc) {
cifs_dbg(VFS, "Error %d during NTLM authentication\n",
rc);
goto ssetup_exit;
}
/* copy ntlm response */
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
CIFS_AUTH_RESP_SIZE);
bcc_ptr += CIFS_AUTH_RESP_SIZE;
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
CIFS_AUTH_RESP_SIZE);
bcc_ptr += CIFS_AUTH_RESP_SIZE;
if (ses->capabilities & CAP_UNICODE) {
/* unicode strings must be word aligned */
if (iov[0].iov_len % 2) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
} else
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
} else if (type == NTLMv2) {
pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
/* LM2 password would be here if we supported it */
pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
/* calculate nlmv2 response and session key */
rc = setup_ntlmv2_rsp(ses, nls_cp);
if (rc) {
cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n",
rc);
goto ssetup_exit;
}
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
ses->auth_key.len - CIFS_SESS_KEY_SIZE);
bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
/* set case sensitive password length after tilen may get
* assigned, tilen is 0 otherwise.
*/
pSMB->req_no_secext.CaseSensitivePasswordLength =
cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
if (ses->capabilities & CAP_UNICODE) {
if (iov[0].iov_len % 2) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
} else
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
} else if (type == Kerberos) {
#ifdef CONFIG_CIFS_UPCALL
struct cifs_spnego_msg *msg;
spnego_key = cifs_get_spnego_key(ses);
if (IS_ERR(spnego_key)) {
rc = PTR_ERR(spnego_key);
spnego_key = NULL;
goto ssetup_exit;
}
msg = spnego_key->payload.data;
/* check version field to make sure that cifs.upcall is
sending us a response in an expected form */
if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
cifs_dbg(VFS, "incorrect version of cifs.upcall "
"expected %d but got %d)",
CIFS_SPNEGO_UPCALL_VERSION, msg->version);
rc = -EKEYREJECTED;
goto ssetup_exit;
}
ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
GFP_KERNEL);
if (!ses->auth_key.response) {
cifs_dbg(VFS,
"Kerberos can't allocate (%u bytes) memory",
msg->sesskey_len);
rc = -ENOMEM;
goto ssetup_exit;
}
ses->auth_key.len = msg->sesskey_len;
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
capabilities |= CAP_EXTENDED_SECURITY;
pSMB->req.Capabilities = cpu_to_le32(capabilities);
iov[1].iov_base = msg->data + msg->sesskey_len;
iov[1].iov_len = msg->secblob_len;
pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
if (ses->capabilities & CAP_UNICODE) {
/* unicode strings must be word aligned */
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_oslm_strings(&bcc_ptr, nls_cp);
unicode_domain_string(&bcc_ptr, ses, nls_cp);
} else
/* BB: is this right? */
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
#else /* ! CONFIG_CIFS_UPCALL */
cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
rc = -ENOSYS;
goto ssetup_exit;
#endif /* CONFIG_CIFS_UPCALL */
} else if (type == RawNTLMSSP) {
if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
rc = -ENOSYS;
goto ssetup_exit;
}
cifs_dbg(FYI, "ntlmssp session setup phase %d\n", phase);
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
capabilities |= CAP_EXTENDED_SECURITY;
pSMB->req.Capabilities |= cpu_to_le32(capabilities);
switch(phase) {
case NtLmNegotiate:
build_ntlmssp_negotiate_blob(
pSMB->req.SecurityBlob, ses);
iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
iov[1].iov_base = pSMB->req.SecurityBlob;
pSMB->req.SecurityBlobLength =
cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
break;
case NtLmAuthenticate:
/*
* 5 is an empirical value, large enough to hold
* authenticate message plus max 10 of av paris,
* domain, user, workstation names, flags, etc.
*/
ntlmsspblob = kzalloc(
5*sizeof(struct _AUTHENTICATE_MESSAGE),
GFP_KERNEL);
if (!ntlmsspblob) {
rc = -ENOMEM;
goto ssetup_exit;
}
rc = build_ntlmssp_auth_blob(ntlmsspblob,
&blob_len, ses, nls_cp);
if (rc)
goto ssetup_exit;
iov[1].iov_len = blob_len;
iov[1].iov_base = ntlmsspblob;
pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
/*
* Make sure that we tell the server that we are using
* the uid that it just gave us back on the response
* (challenge)
*/
smb_buf->Uid = ses->Suid;
break;
default:
cifs_dbg(VFS, "invalid phase %d\n", phase);
rc = -ENOSYS;
goto ssetup_exit;
}
/* unicode strings must be word aligned */
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
*bcc_ptr = 0;
bcc_ptr++;
}
unicode_oslm_strings(&bcc_ptr, nls_cp);
} else {
cifs_dbg(VFS, "secType %d not supported!\n", type);
rc = -ENOSYS;
goto ssetup_exit;
}
iov[2].iov_base = str_area;
iov[2].iov_len = (long) bcc_ptr - (long) str_area;
count = iov[1].iov_len + iov[2].iov_len;
smb_buf->smb_buf_length =
cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
put_bcc(count, smb_buf);
rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
CIFS_LOG_ERROR);
/* SMB request buf freed in SendReceive2 */
pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
smb_buf = (struct smb_hdr *)iov[0].iov_base;
if ((type == RawNTLMSSP) && (resp_buf_type != CIFS_NO_BUFFER) &&
(smb_buf->Status.CifsError ==
cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
if (phase != NtLmNegotiate) {
cifs_dbg(VFS, "Unexpected more processing error\n");
goto ssetup_exit;
}
/* NTLMSSP Negotiate sent now processing challenge (response) */
phase = NtLmChallenge; /* process ntlmssp challenge */
rc = 0; /* MORE_PROC rc is not an error here, but expected */
}
if (rc)
goto ssetup_exit;
if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
rc = -EIO;
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
goto ssetup_exit;
}
action = le16_to_cpu(pSMB->resp.Action);
if (action & GUEST_LOGIN)
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
/* response can have either 3 or 4 word count - Samba sends 3 */
/* and lanman response is 3 */
bytes_remaining = get_bcc(smb_buf);
bcc_ptr = pByteArea(smb_buf);
if (smb_buf->WordCount == 4) {
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
if (blob_len > bytes_remaining) {
cifs_dbg(VFS, "bad security blob length %d\n",
blob_len);
rc = -EINVAL;
goto ssetup_exit;
}
if (phase == NtLmChallenge) {
rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
/* now goto beginning for ntlmssp authenticate phase */
if (rc)
goto ssetup_exit;
}
bcc_ptr += blob_len;
bytes_remaining -= blob_len;
}
/* BB check if Unicode and decode strings */
if (bytes_remaining == 0) {
/* no string area to decode, do nothing */
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
/* unicode string area must be word-aligned */
if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
++bcc_ptr;
--bytes_remaining;
}
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
} else {
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses, nls_cp);
}
ssetup_exit:
if (spnego_key) {
key_invalidate(spnego_key);
key_put(spnego_key);
}
kfree(str_area);
kfree(ntlmsspblob);
ntlmsspblob = NULL;
if (resp_buf_type == CIFS_SMALL_BUFFER) {
cifs_dbg(FYI, "ssetup freeing small buf %p\n", iov[0].iov_base);
cifs_small_buf_release(iov[0].iov_base);
} else if (resp_buf_type == CIFS_LARGE_BUFFER)
cifs_buf_release(iov[0].iov_base);
/* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
if ((phase == NtLmChallenge) && (rc == 0))
goto ssetup_ntlmssp_authenticate;
if (!rc) {
mutex_lock(&ses->server->srv_mutex);
if (!ses->server->session_estab) {
if (ses->server->sign) {
ses->server->session_key.response =
kmemdup(ses->auth_key.response,
ses->auth_key.len, GFP_KERNEL);
if (!ses->server->session_key.response) {
rc = -ENOMEM;
mutex_unlock(&ses->server->srv_mutex);
goto keycp_exit;
}
ses->server->session_key.len =
ses->auth_key.len;
}
ses->server->sequence_number = 0x2;
ses->server->session_estab = true;
}
mutex_unlock(&ses->server->srv_mutex);
cifs_dbg(FYI, "CIFS session established successfully\n");
spin_lock(&GlobalMid_Lock);
ses->status = CifsGood;
ses->need_reconnect = false;
spin_unlock(&GlobalMid_Lock);
}
keycp_exit:
kfree(ses->auth_key.response);
ses->auth_key.response = NULL;
kfree(ses->ntlmssp);
return rc;
}
int
SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
int *pbytes_returned)
{
int rc = 0;
int rstart = 0;
unsigned int receive_len;
struct mid_q_entry *midQ;
struct cifsSesInfo *ses;
if (tcon == NULL || tcon->ses == NULL) {
cERROR(1, "Null smb session");
return -EIO;
}
ses = tcon->ses;
if (ses->server == NULL) {
cERROR(1, "Null tcp session");
return -EIO;
}
if (ses->server->tcpStatus == CifsExiting)
return -ENOENT;
/* Ensure that we do not send more than 50 overlapping requests
to the same server. We may make this configurable later or
use ses->maxReq */
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1, "Illegal length, greater than maximum frame, %d",
in_buf->smb_buf_length);
return -EIO;
}
rc = wait_for_free_request(ses->server, CIFS_BLOCKING_OP);
if (rc)
return rc;
/* make sure that we sign in the same order that we send on this socket
and avoid races inside tcp sendmsg code that could cause corruption
of smb data */
mutex_lock(&ses->server->srv_mutex);
rc = allocate_mid(ses, in_buf, &midQ);
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
return rc;
}
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
if (rc) {
delete_mid(midQ);
mutex_unlock(&ses->server->srv_mutex);
return rc;
}
midQ->midState = MID_REQUEST_SUBMITTED;
#ifdef CONFIG_CIFS_STATS2
atomic_inc(&ses->server->inSend);
#endif
rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
#ifdef CONFIG_CIFS_STATS2
atomic_dec(&ses->server->inSend);
midQ->when_sent = jiffies;
#endif
mutex_unlock(&ses->server->srv_mutex);
if (rc < 0) {
delete_mid(midQ);
return rc;
}
/* Wait for a reply - allow signals to interrupt. */
rc = wait_event_interruptible(ses->server->response_q,
(!(midQ->midState == MID_REQUEST_SUBMITTED)) ||
((ses->server->tcpStatus != CifsGood) &&
(ses->server->tcpStatus != CifsNew)));
/* Were we interrupted by a signal ? */
if ((rc == -ERESTARTSYS) &&
(midQ->midState == MID_REQUEST_SUBMITTED) &&
((ses->server->tcpStatus == CifsGood) ||
(ses->server->tcpStatus == CifsNew))) {
if (in_buf->Command == SMB_COM_TRANSACTION2) {
/* POSIX lock. We send a NT_CANCEL SMB to cause the
blocking lock to return. */
rc = send_nt_cancel(ses->server, in_buf, midQ);
if (rc) {
delete_mid(midQ);
return rc;
}
} else {
/* Windows lock. We send a LOCKINGX_CANCEL_LOCK
to cause the blocking lock to return. */
rc = send_lock_cancel(xid, tcon, in_buf, out_buf);
/* If we get -ENOLCK back the lock may have
already been removed. Don't exit in this case. */
if (rc && rc != -ENOLCK) {
delete_mid(midQ);
return rc;
}
}
if (wait_for_response(ses->server, midQ) == 0) {
/* We got the response - restart system call. */
rstart = 1;
}
}
rc = sync_mid_result(midQ, ses->server);
if (rc != 0)
return rc;
receive_len = midQ->resp_buf->smb_buf_length;
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
cERROR(1, "Frame too large received. Length: %d Xid: %d",
receive_len, xid);
rc = -EIO;
goto out;
}
/* rcvd frame is ok */
if ((out_buf == NULL) || (midQ->midState != MID_RESPONSE_RECEIVED)) {
rc = -EIO;
cERROR(1, "Bad MID state?");
goto out;
}
out_buf->smb_buf_length = receive_len;
memcpy((char *)out_buf + 4,
(char *)midQ->resp_buf + 4,
receive_len);
dump_smb(out_buf, 92);
/* convert the length into a more usable form */
if ((receive_len > 24) &&
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(out_buf,
ses->server,
midQ->sequence_number+1);
if (rc) {
cERROR(1, "Unexpected SMB signature");
/* BB FIXME add code to kill session */
}
}
*pbytes_returned = out_buf->smb_buf_length;
/* BB special case reconnect tid and uid here? */
rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
/* convert ByteCount if necessary */
if (receive_len >= sizeof(struct smb_hdr) - 4
/* do not count RFC1001 header */ +
(2 * out_buf->WordCount) + 2 /* bcc */ )
put_bcc(get_bcc_le(out_buf), out_buf);
out:
delete_mid(midQ);
if (rstart && rc == -EACCES)
return -ERESTARTSYS;
return rc;
}
int
SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
struct smb_hdr *in_buf, struct smb_hdr *out_buf,
int *pbytes_returned, const int long_op)
{
int rc = 0;
unsigned int receive_len;
struct mid_q_entry *midQ;
if (ses == NULL) {
cERROR(1, "Null smb session");
return -EIO;
}
if (ses->server == NULL) {
cERROR(1, "Null tcp session");
return -EIO;
}
if (ses->server->tcpStatus == CifsExiting)
return -ENOENT;
/* Ensure that we do not send more than 50 overlapping requests
to the same server. We may make this configurable later or
use ses->maxReq */
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1, "Illegal length, greater than maximum frame, %d",
in_buf->smb_buf_length);
return -EIO;
}
rc = wait_for_free_request(ses->server, long_op);
if (rc)
return rc;
/* make sure that we sign in the same order that we send on this socket
and avoid races inside tcp sendmsg code that could cause corruption
of smb data */
mutex_lock(&ses->server->srv_mutex);
rc = allocate_mid(ses, in_buf, &midQ);
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
/* Update # of requests on wire to server */
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return rc;
}
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
goto out;
}
midQ->midState = MID_REQUEST_SUBMITTED;
#ifdef CONFIG_CIFS_STATS2
atomic_inc(&ses->server->inSend);
#endif
rc = smb_send(ses->server, in_buf, in_buf->smb_buf_length);
#ifdef CONFIG_CIFS_STATS2
atomic_dec(&ses->server->inSend);
midQ->when_sent = jiffies;
#endif
mutex_unlock(&ses->server->srv_mutex);
if (rc < 0)
goto out;
if (long_op == CIFS_ASYNC_OP)
goto out;
rc = wait_for_response(ses->server, midQ);
if (rc != 0)
goto out;
rc = sync_mid_result(midQ, ses->server);
if (rc != 0) {
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return rc;
}
receive_len = midQ->resp_buf->smb_buf_length;
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
cERROR(1, "Frame too large received. Length: %d Xid: %d",
receive_len, xid);
rc = -EIO;
goto out;
}
/* rcvd frame is ok */
if (midQ->resp_buf && out_buf
&& (midQ->midState == MID_RESPONSE_RECEIVED)) {
out_buf->smb_buf_length = receive_len;
memcpy((char *)out_buf + 4,
(char *)midQ->resp_buf + 4,
receive_len);
dump_smb(out_buf, 92);
/* convert the length into a more usable form */
if ((receive_len > 24) &&
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(out_buf,
ses->server,
midQ->sequence_number+1);
if (rc) {
cERROR(1, "Unexpected SMB signature");
/* BB FIXME add code to kill session */
}
}
*pbytes_returned = out_buf->smb_buf_length;
/* BB special case reconnect tid and uid here? */
rc = map_smb_to_linux_error(out_buf, 0 /* no log */ );
/* convert ByteCount if necessary */
if (receive_len >= sizeof(struct smb_hdr) - 4
/* do not count RFC1001 header */ +
(2 * out_buf->WordCount) + 2 /* bcc */ )
put_bcc(get_bcc_le(midQ->resp_buf), midQ->resp_buf);
} else {
rc = -EIO;
cERROR(1, "Bad MID state?");
}
out:
delete_mid(midQ);
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return rc;
}
int
SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
struct kvec *iov, int n_vec, int *pRespBufType /* ret */,
const int flags)
{
int rc = 0;
int long_op;
unsigned int receive_len;
struct mid_q_entry *midQ;
struct smb_hdr *in_buf = iov[0].iov_base;
long_op = flags & CIFS_TIMEOUT_MASK;
*pRespBufType = CIFS_NO_BUFFER; /* no response buf yet */
if ((ses == NULL) || (ses->server == NULL)) {
cifs_small_buf_release(in_buf);
cERROR(1, "Null session");
return -EIO;
}
if (ses->server->tcpStatus == CifsExiting) {
cifs_small_buf_release(in_buf);
return -ENOENT;
}
/* Ensure that we do not send more than 50 overlapping requests
to the same server. We may make this configurable later or
use ses->maxReq */
rc = wait_for_free_request(ses->server, long_op);
if (rc) {
cifs_small_buf_release(in_buf);
return rc;
}
/* make sure that we sign in the same order that we send on this socket
and avoid races inside tcp sendmsg code that could cause corruption
of smb data */
mutex_lock(&ses->server->srv_mutex);
rc = allocate_mid(ses, in_buf, &midQ);
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
cifs_small_buf_release(in_buf);
/* Update # of requests on wire to server */
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return rc;
}
rc = cifs_sign_smb2(iov, n_vec, ses->server, &midQ->sequence_number);
if (rc) {
mutex_unlock(&ses->server->srv_mutex);
cifs_small_buf_release(in_buf);
goto out;
}
midQ->midState = MID_REQUEST_SUBMITTED;
#ifdef CONFIG_CIFS_STATS2
atomic_inc(&ses->server->inSend);
#endif
rc = smb_sendv(ses->server, iov, n_vec);
#ifdef CONFIG_CIFS_STATS2
atomic_dec(&ses->server->inSend);
midQ->when_sent = jiffies;
#endif
mutex_unlock(&ses->server->srv_mutex);
cifs_small_buf_release(in_buf);
if (rc < 0)
goto out;
if (long_op == CIFS_ASYNC_OP)
goto out;
rc = wait_for_response(ses->server, midQ);
if (rc != 0)
goto out;
rc = sync_mid_result(midQ, ses->server);
if (rc != 0) {
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return rc;
}
receive_len = midQ->resp_buf->smb_buf_length;
if (receive_len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE) {
cERROR(1, "Frame too large received. Length: %d Xid: %d",
receive_len, xid);
rc = -EIO;
goto out;
}
/* rcvd frame is ok */
if (midQ->resp_buf &&
(midQ->midState == MID_RESPONSE_RECEIVED)) {
iov[0].iov_base = (char *)midQ->resp_buf;
if (midQ->largeBuf)
*pRespBufType = CIFS_LARGE_BUFFER;
else
*pRespBufType = CIFS_SMALL_BUFFER;
iov[0].iov_len = receive_len + 4;
dump_smb(midQ->resp_buf, 80);
/* convert the length into a more usable form */
if ((receive_len > 24) &&
(ses->server->secMode & (SECMODE_SIGN_REQUIRED |
SECMODE_SIGN_ENABLED))) {
rc = cifs_verify_signature(midQ->resp_buf,
ses->server,
midQ->sequence_number+1);
if (rc) {
cERROR(1, "Unexpected SMB signature");
/* BB FIXME add code to kill session */
}
}
/* BB special case reconnect tid and uid here? */
rc = map_smb_to_linux_error(midQ->resp_buf,
flags & CIFS_LOG_ERROR);
/* convert ByteCount if necessary */
if (receive_len >= sizeof(struct smb_hdr) - 4
/* do not count RFC1001 header */ +
(2 * midQ->resp_buf->WordCount) + 2 /* bcc */ )
put_bcc(get_bcc_le(midQ->resp_buf), midQ->resp_buf);
if ((flags & CIFS_NO_RESP) == 0)
midQ->resp_buf = NULL; /* mark it so buf will
not be freed by
delete_mid */
} else {
rc = -EIO;
cFYI(1, "Bad MID state?");
}
out:
delete_mid(midQ);
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return rc;
}
