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/*
* fs/cifs/smb2pdu.c
*
* Copyright (C) International Business Machines Corp., 2009, 2013
* Etersoft, 2012
* Author(s): Steve French (sfrench@us.ibm.com)
* Pavel Shilovsky (pshilovsky@samba.org) 2012
*
* Contains the routines for constructing the SMB2 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
*/
/* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
/* Note that there are handle based routines which must be */
/* treated slightly differently for reconnection purposes since we never */
/* want to reuse a stale file handle and only the caller knows the file info */
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/vfs.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/uaccess.h>
#include <linux/pagemap.h>
#include <linux/xattr.h>
#include "smb2pdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "smb2status.h"
#include "smb2glob.h"
#include "cifspdu.h"
/*
* The following table defines the expected "StructureSize" of SMB2 requests
* in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests.
*
* Note that commands are defined in smb2pdu.h in le16 but the array below is
* indexed by command in host byte order.
*/
static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
/* SMB2_NEGOTIATE */ 36,
/* SMB2_SESSION_SETUP */ 25,
/* SMB2_LOGOFF */ 4,
/* SMB2_TREE_CONNECT */ 9,
/* SMB2_TREE_DISCONNECT */ 4,
/* SMB2_CREATE */ 57,
/* SMB2_CLOSE */ 24,
/* SMB2_FLUSH */ 24,
/* SMB2_READ */ 49,
/* SMB2_WRITE */ 49,
/* SMB2_LOCK */ 48,
/* SMB2_IOCTL */ 57,
/* SMB2_CANCEL */ 4,
/* SMB2_ECHO */ 4,
/* SMB2_QUERY_DIRECTORY */ 33,
/* SMB2_CHANGE_NOTIFY */ 32,
/* SMB2_QUERY_INFO */ 41,
/* SMB2_SET_INFO */ 33,
/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
};
static void
smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
const struct cifs_tcon *tcon)
{
struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
char *temp = (char *)hdr;
/* lookup word count ie StructureSize from table */
__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
/*
* smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
* largest operations (Create)
*/
memset(temp, 0, 256);
/* Note this is only network field converted to big endian */
hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
- 4 /* RFC 1001 length field itself not counted */);
hdr->ProtocolId[0] = 0xFE;
hdr->ProtocolId[1] = 'S';
hdr->ProtocolId[2] = 'M';
hdr->ProtocolId[3] = 'B';
hdr->StructureSize = cpu_to_le16(64);
hdr->Command = smb2_cmd;
if (tcon && tcon->ses && tcon->ses->server) {
struct TCP_Server_Info *server = tcon->ses->server;
spin_lock(&server->req_lock);
/* Request up to 2 credits but don't go over the limit. */
if (server->credits >= SMB2_MAX_CREDITS_AVAILABLE)
hdr->CreditRequest = cpu_to_le16(0);
else
hdr->CreditRequest = cpu_to_le16(
min_t(int, SMB2_MAX_CREDITS_AVAILABLE -
server->credits, 2));
spin_unlock(&server->req_lock);
} else {
hdr->CreditRequest = cpu_to_le16(2);
}
hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
if (!tcon)
goto out;
/* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
if ((tcon->ses) &&
(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
hdr->CreditCharge = cpu_to_le16(1);
/* else CreditCharge MBZ */
hdr->TreeId = tcon->tid;
/* Uid is not converted */
if (tcon->ses)
hdr->SessionId = tcon->ses->Suid;
/*
* If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
* to pass the path on the Open SMB prefixed by \\server\share.
* Not sure when we would need to do the augmented path (if ever) and
* setting this flag breaks the SMB2 open operation since it is
* illegal to send an empty path name (without \\server\share prefix)
* when the DFS flag is set in the SMB open header. We could
* consider setting the flag on all operations other than open
* but it is safer to net set it for now.
*/
/* if (tcon->share_flags & SHI1005_FLAGS_DFS)
hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
hdr->Flags |= SMB2_FLAGS_SIGNED;
out:
pdu->StructureSize2 = cpu_to_le16(parmsize);
return;
}
static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
int rc;
struct nls_table *nls_codepage;
struct cifs_ses *ses;
struct TCP_Server_Info *server;
/*
* SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
* check for tcp and smb session status done differently
* for those three - in the calling routine.
*/
if (tcon == NULL)
return 0;
if (smb2_command == SMB2_TREE_CONNECT)
return 0;
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 ((smb2_command != SMB2_WRITE) &&
(smb2_command != SMB2_CREATE) &&
(smb2_command != SMB2_TREE_DISCONNECT)) {
cifs_dbg(FYI, "can not send cmd %d while umounting\n",
smb2_command);
return -ENODEV;
}
}
if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
(!tcon->ses->server))
return -EIO;
ses = tcon->ses;
server = ses->server;
/*
* Give demultiplex thread up to 10 seconds to reconnect, should be
* greater than cifs socket timeout which is 7 seconds
*/
while (server->tcpStatus == CifsNeedReconnect) {
/*
* Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
* here since they are implicitly done when session drops.
*/
switch (smb2_command) {
/*
* BB Should we keep oplock break and add flush to exceptions?
*/
case SMB2_TREE_DISCONNECT:
case SMB2_CANCEL:
case SMB2_CLOSE:
case SMB2_OPLOCK_BREAK:
return -EAGAIN;
}
rc = wait_event_interruptible_timeout(server->response_q,
(server->tcpStatus != CifsNeedReconnect),
10 * HZ);
if (rc < 0) {
cifs_dbg(FYI, "%s: aborting reconnect due to a received"
" signal by the process\n", __func__);
return -ERESTARTSYS;
}
/* are we still trying to reconnect? */
if (server->tcpStatus != CifsNeedReconnect)
break;
/*
* on "soft" mounts we wait once. Hard mounts keep
* retrying until process is killed or server comes
* back on-line
*/
if (!tcon->retry) {
cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
return -EHOSTDOWN;
}
}
if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
return 0;
nls_codepage = load_nls_default();
/*
* need to prevent multiple threads trying to simultaneously reconnect
* the same SMB session
*/
mutex_lock(&tcon->ses->session_mutex);
rc = cifs_negotiate_protocol(0, tcon->ses);
if (!rc && tcon->ses->need_reconnect)
rc = cifs_setup_session(0, tcon->ses, nls_codepage);
if (rc || !tcon->need_reconnect) {
mutex_unlock(&tcon->ses->session_mutex);
goto out;
}
cifs_mark_open_files_invalid(tcon);
rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
mutex_unlock(&tcon->ses->session_mutex);
cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
if (rc)
goto out;
atomic_inc(&tconInfoReconnectCount);
/*
* BB FIXME add code to check if wsize needs update due to negotiated
* smb buffer size shrinking.
*/
out:
/*
* Check if handle based operation so we know whether we can continue
* or not without returning to caller to reset file handle.
*/
/*
* BB Is flush done by server on drop of tcp session? Should we special
* case it and skip above?
*/
switch (smb2_command) {
case SMB2_FLUSH:
case SMB2_READ:
case SMB2_WRITE:
case SMB2_LOCK:
case SMB2_IOCTL:
case SMB2_QUERY_DIRECTORY:
case SMB2_CHANGE_NOTIFY:
case SMB2_QUERY_INFO:
case SMB2_SET_INFO:
rc = -EAGAIN;
}
unload_nls(nls_codepage);
return rc;
}
/*
* Allocate and return pointer to an SMB request hdr, and set basic
* SMB information in the SMB header. If the return code is zero, this
* function must have filled in request_buf pointer.
*/
static int
small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
void **request_buf)
{
int rc = 0;
rc = smb2_reconnect(smb2_command, tcon);
if (rc)
return rc;
/* BB eventually switch this to SMB2 specific small buf size */
*request_buf = cifs_small_buf_get();
if (*request_buf == NULL) {
/* BB should we add a retry in here if not a writepage? */
return -ENOMEM;
}
smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
if (tcon != NULL) {
#ifdef CONFIG_CIFS_STATS2
uint16_t com_code = le16_to_cpu(smb2_command);
cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
#endif
cifs_stats_inc(&tcon->num_smbs_sent);
}
return rc;
}
static void
free_rsp_buf(int resp_buftype, void *rsp)
{
if (resp_buftype == CIFS_SMALL_BUFFER)
cifs_small_buf_release(rsp);
else if (resp_buftype == CIFS_LARGE_BUFFER)
cifs_buf_release(rsp);
}
/*
*
* SMB2 Worker functions follow:
*
* The general structure of the worker functions is:
* 1) Call smb2_init (assembles SMB2 header)
* 2) Initialize SMB2 command specific fields in fixed length area of SMB
* 3) Call smb_sendrcv2 (sends request on socket and waits for response)
* 4) Decode SMB2 command specific fields in the fixed length area
* 5) Decode variable length data area (if any for this SMB2 command type)
* 6) Call free smb buffer
* 7) return
*
*/
int
SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
struct smb2_negotiate_req *req;
struct smb2_negotiate_rsp *rsp;
struct kvec iov[1];
int rc = 0;
int resp_buftype;
struct TCP_Server_Info *server = ses->server;
int blob_offset, blob_length;
char *security_blob;
int flags = CIFS_NEG_OP;
cifs_dbg(FYI, "Negotiate protocol\n");
if (!server) {
WARN(1, "%s: server is NULL!\n", __func__);
return -EIO;
}
rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
if (rc)
return rc;
req->hdr.SessionId = 0;
req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
inc_rfc1001_len(req, 2);
/* only one of SMB2 signing flags may be set in SMB2 request */
if (ses->sign)
req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
else if (global_secflags & CIFSSEC_MAY_SIGN)
req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
else
req->SecurityMode = 0;
req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
/* ClientGUID must be zero for SMB2.02 dialect */
if (ses->server->vals->protocol_id == SMB20_PROT_ID)
memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
else
memcpy(req->ClientGUID, server->client_guid,
SMB2_CLIENT_GUID_SIZE);
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
/*
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
if (rc != 0)
goto neg_exit;
cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
/* BB we may eventually want to match the negotiated vs. requested
dialect, even though we are only requesting one at a time */
if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
else {
cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
le16_to_cpu(rsp->DialectRevision));
rc = -EIO;
goto neg_exit;
}
server->dialect = le16_to_cpu(rsp->DialectRevision);
/* SMB2 only has an extended negflavor */
server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
/* set it to the maximum buffer size value we can send with 1 credit */
server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
SMB2_MAX_BUFFER_SIZE);
server->max_read = le32_to_cpu(rsp->MaxReadSize);
server->max_write = le32_to_cpu(rsp->MaxWriteSize);
/* BB Do we need to validate the SecurityMode? */
server->sec_mode = le16_to_cpu(rsp->SecurityMode);
server->capabilities = le32_to_cpu(rsp->Capabilities);
/* Internal types */
server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
&rsp->hdr);
/*
* See MS-SMB2 section 2.2.4: if no blob, client picks default which
* for us will be
* ses->sectype = RawNTLMSSP;
* but for time being this is our only auth choice so doesn't matter.
* We just found a server which sets blob length to zero expecting raw.
*/
if (blob_length == 0)
cifs_dbg(FYI, "missing security blob on negprot\n");
rc = cifs_enable_signing(server, ses->sign);
#ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
if (rc)
goto neg_exit;
if (blob_length)
rc = decode_neg_token_init(security_blob, blob_length,
&server->sec_type);
if (rc == 1)
rc = 0;
else if (rc == 0) {
rc = -EIO;
goto neg_exit;
}
#endif
neg_exit:
free_rsp_buf(resp_buftype, rsp);
return rc;
}
int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
int rc;
struct validate_negotiate_info_req *pneg_inbuf;
struct validate_negotiate_info_rsp *pneg_rsp = NULL;
u32 rsplen;
cifs_dbg(FYI, "validate negotiate\n");
/*
* validation ioctl must be signed, so no point sending this if we
* can not sign it (ie are not known user). Even if signing is not
* required (enabled but not negotiated), in those cases we selectively
* sign just this, the first and only signed request on a connection.
* Having validation of negotiate info helps reduce attack vectors.
*/
if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
return 0; /* validation requires signing */
if (tcon->ses->user_name == NULL) {
cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
return 0; /* validation requires signing */
}
if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
if (!pneg_inbuf)
return -ENOMEM;
pneg_inbuf->Capabilities =
cpu_to_le32(tcon->ses->server->vals->req_capabilities);
memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
SMB2_CLIENT_GUID_SIZE);
if (tcon->ses->sign)
pneg_inbuf->SecurityMode =
cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
else if (global_secflags & CIFSSEC_MAY_SIGN)
pneg_inbuf->SecurityMode =
cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
else
pneg_inbuf->SecurityMode = 0;
pneg_inbuf->DialectCount = cpu_to_le16(1);
pneg_inbuf->Dialects[0] =
cpu_to_le16(tcon->ses->server->vals->protocol_id);
rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
(char *)pneg_inbuf, sizeof(struct validate_negotiate_info_req),
(char **)&pneg_rsp, &rsplen);
if (rc != 0) {
cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
rc = -EIO;
goto out_free_inbuf;
}
rc = -EIO;
if (rsplen != sizeof(*pneg_rsp)) {
cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
rsplen);
/* relax check since Mac returns max bufsize allowed on ioctl */
if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
goto out_free_rsp;
}
/* check validate negotiate info response matches what we got earlier */
if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
goto vneg_out;
if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
goto vneg_out;
/* do not validate server guid because not saved at negprot time yet */
if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
goto vneg_out;
/* validate negotiate successful */
rc = 0;
cifs_dbg(FYI, "validate negotiate info successful\n");
goto out_free_rsp;
vneg_out:
cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
out_free_rsp:
kfree(pneg_rsp);
out_free_inbuf:
kfree(pneg_inbuf);
return rc;
}
int
SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
const struct nls_table *nls_cp)
{
struct smb2_sess_setup_req *req;
struct smb2_sess_setup_rsp *rsp = NULL;
struct kvec iov[2];
int rc = 0;
int resp_buftype;
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
struct TCP_Server_Info *server = ses->server;
u16 blob_length = 0;
char *security_blob;
unsigned char *ntlmssp_blob = NULL;
bool use_spnego = false; /* else use raw ntlmssp */
u64 previous_session = ses->Suid;
cifs_dbg(FYI, "Session Setup\n");
if (!server) {
WARN(1, "%s: server is NULL!\n", __func__);
return -EIO;
}
/*
* If we are here due to reconnect, free per-smb session key
* in case signing was required.
*/
kfree(ses->auth_key.response);
ses->auth_key.response = NULL;
/*
* 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 = true;
/* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
ses->sectype = RawNTLMSSP;
ssetup_ntlmssp_authenticate:
if (phase == NtLmChallenge)
phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
if (rc)
return rc;
req->hdr.SessionId = 0; /* First session, not a reauthenticate */
/* if reconnect, we need to send previous sess id, otherwise it is 0 */
req->PreviousSessionId = previous_session;
req->VcNumber = 0; /* MBZ */
/* to enable echos and oplocks */
req->hdr.CreditRequest = cpu_to_le16(3);
/* only one of SMB2 signing flags may be set in SMB2 request */
if (server->sign)
req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
else
req->SecurityMode = 0;
req->Capabilities = 0;
req->Channel = 0; /* MBZ */
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field and 1 for pad */
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
if (phase == NtLmNegotiate) {
ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
GFP_KERNEL);
if (ntlmssp_blob == NULL) {
rc = -ENOMEM;
goto ssetup_exit;
}
build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
if (use_spnego) {
/* blob_length = build_spnego_ntlmssp_blob(
&security_blob,
sizeof(struct _NEGOTIATE_MESSAGE),
ntlmssp_blob); */
/* BB eventually need to add this */
cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
rc = -EOPNOTSUPP;
kfree(ntlmssp_blob);
goto ssetup_exit;
} else {
blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
/* with raw NTLMSSP we don't encapsulate in SPNEGO */
security_blob = ntlmssp_blob;
}
} else if (phase == NtLmAuthenticate) {
req->hdr.SessionId = ses->Suid;
rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
nls_cp);
if (rc) {
cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
rc);
goto ssetup_exit; /* BB double check error handling */
}
if (use_spnego) {
/* blob_length = build_spnego_ntlmssp_blob(
&security_blob,
blob_length,
ntlmssp_blob); */
cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
rc = -EOPNOTSUPP;
kfree(ntlmssp_blob);
goto ssetup_exit;
} else {
security_blob = ntlmssp_blob;
}
} else {
cifs_dbg(VFS, "illegal ntlmssp phase\n");
rc = -EIO;
goto ssetup_exit;
}
/* Testing shows that buffer offset must be at location of Buffer[0] */
req->SecurityBufferOffset =
cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
1 /* pad */ - 4 /* rfc1001 len */);
req->SecurityBufferLength = cpu_to_le16(blob_length);
iov[1].iov_base = security_blob;
iov[1].iov_len = blob_length;
inc_rfc1001_len(req, blob_length - 1 /* pad */);
/* BB add code to build os and lm fields */
rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
CIFS_LOG_ERROR | CIFS_NEG_OP);
kfree(security_blob);
rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
if (resp_buftype != CIFS_NO_BUFFER &&
rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
if (phase != NtLmNegotiate) {
cifs_dbg(VFS, "Unexpected more processing error\n");
goto ssetup_exit;
}
if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
le16_to_cpu(rsp->SecurityBufferOffset)) {
cifs_dbg(VFS, "Invalid security buffer offset %d\n",
le16_to_cpu(rsp->SecurityBufferOffset));
rc = -EIO;
goto ssetup_exit;
}
/* NTLMSSP Negotiate sent now processing challenge (response) */
phase = NtLmChallenge; /* process ntlmssp challenge */
rc = 0; /* MORE_PROCESSING is not an error here but expected */
ses->Suid = rsp->hdr.SessionId;
rc = decode_ntlmssp_challenge(rsp->Buffer,
le16_to_cpu(rsp->SecurityBufferLength), ses);
}
/*
* BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
* but at least the raw NTLMSSP case works.
*/
/*
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
if (rc != 0)
goto ssetup_exit;
ses->session_flags = le16_to_cpu(rsp->SessionFlags);
if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
ssetup_exit:
free_rsp_buf(resp_buftype, rsp);
/* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
if ((phase == NtLmChallenge) && (rc == 0))
goto ssetup_ntlmssp_authenticate;
if (!rc) {
mutex_lock(&server->srv_mutex);
if (server->ops->generate_signingkey) {
rc = server->ops->generate_signingkey(ses);
if (rc) {
cifs_dbg(FYI,
"SMB3 session key generation failed\n");
mutex_unlock(&server->srv_mutex);
goto keygen_exit;
}
}
if (!server->session_estab) {
server->sequence_number = 0x2;
server->session_estab = true;
}
mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "SMB2/3 session established successfully\n");
spin_lock(&GlobalMid_Lock);
ses->status = CifsGood;
ses->need_reconnect = false;
spin_unlock(&GlobalMid_Lock);
}
keygen_exit:
kfree(ses->ntlmssp);
return rc;
}
int
SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
{
struct smb2_logoff_req *req; /* response is also trivial struct */
int rc = 0;
struct TCP_Server_Info *server;
cifs_dbg(FYI, "disconnect session %p\n", ses);
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
/* no need to send SMB logoff if uid already closed due to reconnect */
if (ses->need_reconnect)
goto smb2_session_already_dead;
rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
if (rc)
return rc;
/* since no tcon, smb2_init can not do this, so do here */
req->hdr.SessionId = ses->Suid;
if (server->sign)
req->hdr.Flags |= SMB2_FLAGS_SIGNED;
rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
/*
* No tcon so can't do
* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
*/
smb2_session_already_dead:
return rc;
}
static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
}
#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
/* These are similar values to what Windows uses */
static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
{
tcon->max_chunks = 256;
tcon->max_bytes_chunk = 1048576;
tcon->max_bytes_copy = 16777216;
}
int
SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
struct cifs_tcon *tcon, const struct nls_table *cp)
{
struct smb2_tree_connect_req *req;
struct smb2_tree_connect_rsp *rsp = NULL;
struct kvec iov[2];
int rc = 0;
int resp_buftype;
int unc_path_len;
struct TCP_Server_Info *server;
__le16 *unc_path = NULL;
cifs_dbg(FYI, "TCON\n");
if ((ses->server) && tree)
server = ses->server;
else
return -EIO;
unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
if (unc_path == NULL)
return -ENOMEM;
unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
unc_path_len *= 2;
if (unc_path_len < 2) {
kfree(unc_path);
return -EINVAL;
}
/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
if (tcon)
tcon->tid = 0;
rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
if (rc) {
kfree(unc_path);
return rc;
}
if (tcon == NULL) {
/* since no tcon, smb2_init can not do this, so do here */
req->hdr.SessionId = ses->Suid;
/* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
}
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field and 1 for pad */
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
/* Testing shows that buffer offset must be at location of Buffer[0] */
req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
- 1 /* pad */ - 4 /* do not count rfc1001 len field */);
req->PathLength = cpu_to_le16(unc_path_len - 2);
iov[1].iov_base = unc_path;
iov[1].iov_len = unc_path_len;
inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
if (rc != 0) {
if (tcon) {
cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
tcon->need_reconnect = true;
}
goto tcon_error_exit;
}
if (tcon == NULL) {
ses->ipc_tid = rsp->hdr.TreeId;
goto tcon_exit;
}
switch (rsp->ShareType) {
case SMB2_SHARE_TYPE_DISK:
cifs_dbg(FYI, "connection to disk share\n");
break;
case SMB2_SHARE_TYPE_PIPE:
tcon->ipc = true;
cifs_dbg(FYI, "connection to pipe share\n");
break;
case SMB2_SHARE_TYPE_PRINT:
tcon->ipc = true;
cifs_dbg(FYI, "connection to printer\n");
break;
default:
cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
rc = -EOPNOTSUPP;
goto tcon_error_exit;
}
tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
tcon->tidStatus = CifsGood;
tcon->need_reconnect = false;
tcon->tid = rsp->hdr.TreeId;
strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
init_copy_chunk_defaults(tcon);
if (tcon->ses->server->ops->validate_negotiate)
rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
tcon_exit:
free_rsp_buf(resp_buftype, rsp);
kfree(unc_path);
return rc;
tcon_error_exit:
if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
}
goto tcon_exit;
}
int
SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
{
struct smb2_tree_disconnect_req *req; /* response is trivial */
int rc = 0;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
cifs_dbg(FYI, "Tree Disconnect\n");
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
return 0;
rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
if (rc)
return rc;
rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
if (rc)
cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
return rc;
}
static struct create_durable *
create_durable_buf(void)
{
struct create_durable *buf;
buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_durable, Data));
buf->ccontext.DataLength = cpu_to_le32(16);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_durable, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
buf->Name[0] = 'D';
buf->Name[1] = 'H';
buf->Name[2] = 'n';
buf->Name[3] = 'Q';
return buf;
}
static struct create_durable *
create_reconnect_durable_buf(struct cifs_fid *fid)
{
struct create_durable *buf;
buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
if (!buf)
return NULL;
buf->ccontext.DataOffset = cpu_to_le16(offsetof
(struct create_durable, Data));
buf->ccontext.DataLength = cpu_to_le32(16);
buf->ccontext.NameOffset = cpu_to_le16(offsetof
(struct create_durable, Name));
buf->ccontext.NameLength = cpu_to_le16(4);
buf->Data.Fid.PersistentFileId = fid->persistent_fid;
buf->Data.Fid.VolatileFileId = fid->volatile_fid;
/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
buf->Name[0] = 'D';
buf->Name[1] = 'H';
buf->Name[2] = 'n';
buf->Name[3] = 'C';
return buf;
}
static __u8
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
unsigned int *epoch, char *lease_key)
{
char *data_offset;
struct create_context *cc;
unsigned int next;
unsigned int remaining;
char *name;
data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
remaining = le32_to_cpu(rsp->CreateContextsLength);
cc = (struct create_context *)data_offset;
while (remaining >= sizeof(struct create_context)) {
name = le16_to_cpu(cc->NameOffset) + (char *)cc;
if (le16_to_cpu(cc->NameLength) == 4 &&
strncmp(name, "RqLs", 4) == 0)
return server->ops->parse_lease_buf(cc, epoch,
lease_key);
next = le32_to_cpu(cc->Next);
if (!next)
break;
remaining -= next;
cc = (struct create_context *)((char *)cc + next);
}
return 0;
}
static int
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
{
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = server->vals->create_lease_size;
req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
if (!req->CreateContextsOffset)
req->CreateContextsOffset = cpu_to_le32(
sizeof(struct smb2_create_req) - 4 +
iov[num - 1].iov_len);
le32_add_cpu(&req->CreateContextsLength,
server->vals->create_lease_size);
inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
*num_iovec = num + 1;
return 0;
}
static int
add_durable_context(struct kvec *iov, unsigned int *num_iovec,
struct cifs_open_parms *oparms)
{
struct smb2_create_req *req = iov[0].iov_base;
unsigned int num = *num_iovec;
if (oparms->reconnect) {
iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
/* indicate that we don't need to relock the file */
oparms->reconnect = false;
} else
iov[num].iov_base = create_durable_buf();
if (iov[num].iov_base == NULL)
return -ENOMEM;
iov[num].iov_len = sizeof(struct create_durable);
if (!req->CreateContextsOffset)
req->CreateContextsOffset =
cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
iov[1].iov_len);
le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
*num_iovec = num + 1;
return 0;
}
int
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
__u8 *oplock, struct smb2_file_all_info *buf,
struct smb2_err_rsp **err_buf)
{
struct smb2_create_req *req;
struct smb2_create_rsp *rsp;
struct TCP_Server_Info *server;
struct cifs_tcon *tcon = oparms->tcon;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[4] = {{NULL, 0}};
int resp_buftype;
int uni_path_len;
__le16 *copy_path = NULL;
int copy_size;
int rc = 0;
unsigned int num_iovecs = 2;
__u32 file_attributes = 0;
char *dhc_buf = NULL, *lc_buf = NULL;
cifs_dbg(FYI, "create/open\n");
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
if (rc)
return rc;
if (oparms->create_options & CREATE_OPTION_READONLY)
file_attributes |= ATTR_READONLY;
req->ImpersonationLevel = IL_IMPERSONATION;
req->DesiredAccess = cpu_to_le32(oparms->desired_access);
/* File attributes ignored on open (used in create though) */
req->FileAttributes = cpu_to_le32(file_attributes);
req->ShareAccess = FILE_SHARE_ALL_LE;
req->CreateDisposition = cpu_to_le32(oparms->disposition);
req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
/* do not count rfc1001 len field */
req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
/* MUST set path len (NameLength) to 0 opening root of share */
req->NameLength = cpu_to_le16(uni_path_len - 2);
/* -1 since last byte is buf[0] which is sent below (path) */
iov[0].iov_len--;
if (uni_path_len % 8 != 0) {
copy_size = uni_path_len / 8 * 8;
if (copy_size < uni_path_len)
copy_size += 8;
copy_path = kzalloc(copy_size, GFP_KERNEL);
if (!copy_path) {
cifs_small_buf_release(req);
return -ENOMEM;
}
memcpy((char *)copy_path, (const char *)path,
uni_path_len);
uni_path_len = copy_size;
path = copy_path;
}
iov[1].iov_len = uni_path_len;
iov[1].iov_base = path;
/* -1 since last byte is buf[0] which was counted in smb2_buf_len */
inc_rfc1001_len(req, uni_path_len - 1);
if (!server->oplocks)
*oplock = SMB2_OPLOCK_LEVEL_NONE;
if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
*oplock == SMB2_OPLOCK_LEVEL_NONE)
req->RequestedOplockLevel = *oplock;
else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
(oparms->create_options & CREATE_NOT_FILE))
req->RequestedOplockLevel = *oplock; /* no srv lease support */
else {
rc = add_lease_context(server, iov, &num_iovecs,
oparms->fid->lease_key, oplock);
if (rc) {
cifs_small_buf_release(req);
kfree(copy_path);
return rc;
}
lc_buf = iov[num_iovecs-1].iov_base;
}
if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
/* need to set Next field of lease context if we request it */
if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
struct create_context *ccontext =
(struct create_context *)iov[num_iovecs-1].iov_base;
ccontext->Next =
cpu_to_le32(server->vals->create_lease_size);
}
rc = add_durable_context(iov, &num_iovecs, oparms);
if (rc) {
cifs_small_buf_release(req);
kfree(copy_path);
kfree(lc_buf);
return rc;
}
dhc_buf = iov[num_iovecs-1].iov_base;
}
rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
rsp = (struct smb2_create_rsp *)iov[0].iov_base;
if (rc != 0) {
cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
if (err_buf && rsp)
*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
GFP_KERNEL);
goto creat_exit;
}
oparms->fid->persistent_fid = rsp->PersistentFileId;
oparms->fid->volatile_fid = rsp->VolatileFileId;
if (buf) {
memcpy(buf, &rsp->CreationTime, 32);
buf->AllocationSize = rsp->AllocationSize;
buf->EndOfFile = rsp->EndofFile;
buf->Attributes = rsp->FileAttributes;
buf->NumberOfLinks = cpu_to_le32(1);
buf->DeletePending = 0;
}
if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
oparms->fid->lease_key);
else
*oplock = rsp->OplockLevel;
creat_exit:
kfree(copy_path);
kfree(lc_buf);
kfree(dhc_buf);
free_rsp_buf(resp_buftype, rsp);
return rc;
}
/*
* SMB2 IOCTL is used for both IOCTLs and FSCTLs
*/
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
u32 indatalen, char **out_data, u32 *plen /* returned data len */)
{
struct smb2_ioctl_req *req;
struct smb2_ioctl_rsp *rsp;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[2];
int resp_buftype;
int num_iovecs;
int rc = 0;
cifs_dbg(FYI, "SMB2 IOCTL\n");
*out_data = NULL;
/* zero out returned data len, in case of error */
if (plen)
*plen = 0;
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
if (rc)
return rc;
req->CtlCode = cpu_to_le32(opcode);
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
if (indatalen) {
req->InputCount = cpu_to_le32(indatalen);
/* do not set InputOffset if no input data */
req->InputOffset =
cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
iov[1].iov_base = in_data;
iov[1].iov_len = indatalen;
num_iovecs = 2;
} else
num_iovecs = 1;
req->OutputOffset = 0;
req->OutputCount = 0; /* MBZ */
/*
* Could increase MaxOutputResponse, but that would require more
* than one credit. Windows typically sets this smaller, but for some
* ioctls it may be useful to allow server to send more. No point
* limiting what the server can send as long as fits in one credit
* Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
* (by default, note that it can be overridden to make max larger)
* in responses (except for read responses which can be bigger.
* We may want to bump this limit up
*/
req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
if (is_fsctl)
req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
else
req->Flags = 0;
iov[0].iov_base = (char *)req;
/*
* If no input data, the size of ioctl struct in
* protocol spec still includes a 1 byte data buffer,
* but if input data passed to ioctl, we do not
* want to double count this, so we do not send
* the dummy one byte of data in iovec[0] if sending
* input data (in iovec[1]). We also must add 4 bytes
* in first iovec to allow for rfc1002 length field.
*/
if (indatalen) {
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
inc_rfc1001_len(req, indatalen - 1);
} else
iov[0].iov_len = get_rfc1002_length(req) + 4;
/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
req->hdr.Flags |= SMB2_FLAGS_SIGNED;
rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
if ((rc != 0) && (rc != -EINVAL)) {
if (tcon)
cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
goto ioctl_exit;
} else if (rc == -EINVAL) {
if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
(opcode != FSCTL_SRV_COPYCHUNK)) {
if (tcon)
cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
goto ioctl_exit;
}
}
/* check if caller wants to look at return data or just return rc */
if ((plen == NULL) || (out_data == NULL))
goto ioctl_exit;
*plen = le32_to_cpu(rsp->OutputCount);
/* We check for obvious errors in the output buffer length and offset */
if (*plen == 0)
goto ioctl_exit; /* server returned no data */
else if (*plen > get_rfc1002_length(rsp) || *plen > 0xFF00) {
cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
*plen = 0;
rc = -EIO;
goto ioctl_exit;
}
if (get_rfc1002_length(rsp) - *plen < le32_to_cpu(rsp->OutputOffset)) {
cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
le32_to_cpu(rsp->OutputOffset));
*plen = 0;
rc = -EIO;
goto ioctl_exit;
}
*out_data = kmalloc(*plen, GFP_KERNEL);
if (*out_data == NULL) {
rc = -ENOMEM;
goto ioctl_exit;
}
memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
*plen);
ioctl_exit:
free_rsp_buf(resp_buftype, rsp);
return rc;
}
/*
* Individual callers to ioctl worker function follow
*/
int
SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid)
{
int rc;
struct compress_ioctl fsctl_input;
char *ret_data = NULL;
fsctl_input.CompressionState =
__constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
FSCTL_SET_COMPRESSION, true /* is_fsctl */,
(char *)&fsctl_input /* data input */,
2 /* in data len */, &ret_data /* out data */, NULL);
cifs_dbg(FYI, "set compression rc %d\n", rc);
return rc;
}
int
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid)
{
struct smb2_close_req *req;
struct smb2_close_rsp *rsp;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[1];
int resp_buftype;
int rc = 0;
cifs_dbg(FYI, "Close\n");
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
if (rc)
return rc;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
rsp = (struct smb2_close_rsp *)iov[0].iov_base;
if (rc != 0) {
if (tcon)
cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
goto close_exit;
}
/* BB FIXME - decode close response, update inode for caching */
close_exit:
free_rsp_buf(resp_buftype, rsp);
return rc;
}
static int
validate_buf(unsigned int offset, unsigned int buffer_length,
struct smb2_hdr *hdr, unsigned int min_buf_size)
{
unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
char *end_of_buf = begin_of_buf + buffer_length;
if (buffer_length < min_buf_size) {
cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
buffer_length, min_buf_size);
return -EINVAL;
}
/* check if beyond RFC1001 maximum length */
if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
buffer_length, smb_len);
return -EINVAL;
}
if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
cifs_dbg(VFS, "illegal server response, bad offset to data\n");
return -EINVAL;
}
return 0;
}
/*
* If SMB buffer fields are valid, copy into temporary buffer to hold result.
* Caller must free buffer.
*/
static int
validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
struct smb2_hdr *hdr, unsigned int minbufsize,
char *data)
{
char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
int rc;
if (!data)
return -EINVAL;
rc = validate_buf(offset, buffer_length, hdr, minbufsize);
if (rc)
return rc;
memcpy(data, begin_of_buf, buffer_length);
return 0;
}
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, u8 info_class,
size_t output_len, size_t min_len, void *data)
{
struct smb2_query_info_req *req;
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov[2];
int rc = 0;
int resp_buftype;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
cifs_dbg(FYI, "Query Info\n");
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
if (rc)
return rc;
req->InfoType = SMB2_O_INFO_FILE;
req->FileInfoClass = info_class;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
/* 4 for rfc1002 length field and 1 for Buffer */
req->InputBufferOffset =
cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
req->OutputBufferLength = cpu_to_le32(output_len);
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qinf_exit;
}
rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength),
&rsp->hdr, min_len, data);
qinf_exit:
free_rsp_buf(resp_buftype, rsp);
return rc;
}
int
SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid,
struct smb2_file_all_info *data)
{
return query_info(xid, tcon, persistent_fid, volatile_fid,
FILE_ALL_INFORMATION,
sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
sizeof(struct smb2_file_all_info), data);
}
int
SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
{
return query_info(xid, tcon, persistent_fid, volatile_fid,
FILE_INTERNAL_INFORMATION,
sizeof(struct smb2_file_internal_info),
sizeof(struct smb2_file_internal_info), uniqueid);
}
/*
* This is a no-op for now. We're not really interested in the reply, but
* rather in the fact that the server sent one and that server->lstrp
* gets updated.
*
* FIXME: maybe we should consider checking that the reply matches request?
*/
static void
smb2_echo_callback(struct mid_q_entry *mid)
{
struct TCP_Server_Info *server = mid->callback_data;
struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
unsigned int credits_received = 1;
if (mid->mid_state == MID_RESPONSE_RECEIVED)
credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
DeleteMidQEntry(mid);
add_credits(server, credits_received, CIFS_ECHO_OP);
}
void smb2_reconnect_server(struct work_struct *work)
{
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, reconnect.work);
struct cifs_ses *ses;
struct cifs_tcon *tcon, *tcon2;
struct list_head tmp_list;
int tcon_exist = false;
/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
mutex_lock(&server->reconnect_mutex);
INIT_LIST_HEAD(&tmp_list);
cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
if (tcon->need_reconnect) {
tcon->tc_count++;
list_add_tail(&tcon->rlist, &tmp_list);
tcon_exist = true;
}
}
}
/*
* Get the reference to server struct to be sure that the last call of
* cifs_put_tcon() in the loop below won't release the server pointer.
*/
if (tcon_exist)
server->srv_count++;
spin_unlock(&cifs_tcp_ses_lock);
list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
smb2_reconnect(SMB2_ECHO, tcon);
list_del_init(&tcon->rlist);
cifs_put_tcon(tcon);
}
cifs_dbg(FYI, "Reconnecting tcons finished\n");
mutex_unlock(&server->reconnect_mutex);
/* now we can safely release srv struct */
if (tcon_exist)
cifs_put_tcp_session(server, 1);
}
int
SMB2_echo(struct TCP_Server_Info *server)
{
struct smb2_echo_req *req;
int rc = 0;
struct kvec iov;
struct smb_rqst rqst = { .rq_iov = &iov,
.rq_nvec = 1 };
cifs_dbg(FYI, "In echo request\n");
if (server->tcpStatus == CifsNeedNegotiate) {
/* No need to send echo on newly established connections */
queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
return rc;
}
rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
if (rc)
return rc;
req->hdr.CreditRequest = cpu_to_le16(1);
iov.iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov.iov_len = get_rfc1002_length(req) + 4;
rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
CIFS_ECHO_OP);
if (rc)
cifs_dbg(FYI, "Echo request failed: %d\n", rc);
cifs_small_buf_release(req);
return rc;
}
int
SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid)
{
struct smb2_flush_req *req;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
struct kvec iov[1];
int resp_buftype;
int rc = 0;
cifs_dbg(FYI, "Flush\n");
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
if (rc)
return rc;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
if ((rc != 0) && tcon)
cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
free_rsp_buf(resp_buftype, iov[0].iov_base);
return rc;
}
/*
* To form a chain of read requests, any read requests after the first should
* have the end_of_chain boolean set to true.
*/
static int
smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
unsigned int remaining_bytes, int request_type)
{
int rc = -EACCES;
struct smb2_read_req *req = NULL;
rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
if (rc)
return rc;
if (io_parms->tcon->ses->server == NULL)
return -ECONNABORTED;
req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = io_parms->persistent_fid;
req->VolatileFileId = io_parms->volatile_fid;
req->ReadChannelInfoOffset = 0; /* reserved */
req->ReadChannelInfoLength = 0; /* reserved */
req->Channel = 0; /* reserved */
req->MinimumCount = 0;
req->Length = cpu_to_le32(io_parms->length);
req->Offset = cpu_to_le64(io_parms->offset);
if (request_type & CHAINED_REQUEST) {
if (!(request_type & END_OF_CHAIN)) {
/* 4 for rfc1002 length field */
req->hdr.NextCommand =
cpu_to_le32(get_rfc1002_length(req) + 4);
} else /* END_OF_CHAIN */
req->hdr.NextCommand = 0;
if (request_type & RELATED_REQUEST) {
req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
/*
* Related requests use info from previous read request
* in chain.
*/
req->hdr.SessionId = 0xFFFFFFFF;
req->hdr.TreeId = 0xFFFFFFFF;
req->PersistentFileId = 0xFFFFFFFF;
req->VolatileFileId = 0xFFFFFFFF;
}
}
if (remaining_bytes > io_parms->length)
req->RemainingBytes = cpu_to_le32(remaining_bytes);
else
req->RemainingBytes = 0;
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov[0].iov_len = get_rfc1002_length(req) + 4;
return rc;
}
static void
smb2_readv_callback(struct mid_q_entry *mid)
{
struct cifs_readdata *rdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
unsigned int credits_received = 1;
struct smb_rqst rqst = { .rq_iov = &rdata->iov,
.rq_nvec = 1,
.rq_pages = rdata->pages,
.rq_npages = rdata->nr_pages,
.rq_pagesz = rdata->pagesz,
.rq_tailsz = rdata->tailsz };
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
__func__, mid->mid, mid->mid_state, rdata->result,
rdata->bytes);
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
credits_received = le16_to_cpu(buf->CreditRequest);
/* result already set, check signature */
if (server->sign) {
int rc;
rc = smb2_verify_signature(&rqst, server);
if (rc)
cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
rc);
}
/* FIXME: should this be counted toward the initiating task? */
task_io_account_read(rdata->bytes);
cifs_stats_bytes_read(tcon, rdata->bytes);
break;
case MID_REQUEST_SUBMITTED:
case MID_RETRY_NEEDED:
rdata->result = -EAGAIN;
break;
default:
if (rdata->result != -ENODATA)
rdata->result = -EIO;
}
if (rdata->result)
cifs_stats_fail_inc(tcon, SMB2_READ_HE);
queue_work(cifsiod_wq, &rdata->work);
DeleteMidQEntry(mid);
add_credits(server, credits_received, 0);
}
/* smb2_async_readv - send an async write, and set up mid to handle result */
int
smb2_async_readv(struct cifs_readdata *rdata)
{
int rc;
struct smb2_hdr *buf;
struct cifs_io_parms io_parms;
struct smb_rqst rqst = { .rq_iov = &rdata->iov,
.rq_nvec = 1 };
cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
__func__, rdata->offset, rdata->bytes);
io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
io_parms.offset = rdata->offset;
io_parms.length = rdata->bytes;
io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
io_parms.pid = rdata->pid;
rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
if (rc)
return rc;
buf = (struct smb2_hdr *)rdata->iov.iov_base;
/* 4 for rfc1002 length field */
rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
kref_get(&rdata->refcount);
rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
cifs_readv_receive, smb2_readv_callback,
rdata, 0);
if (rc) {
kref_put(&rdata->refcount, cifs_readdata_release);
cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
}
cifs_small_buf_release(buf);
return rc;
}
int
SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, char **buf, int *buf_type)
{
int resp_buftype, rc = -EACCES;
struct smb2_read_rsp *rsp = NULL;
struct kvec iov[1];
*nbytes = 0;
rc = smb2_new_read_req(iov, io_parms, 0, 0);
if (rc)
return rc;
rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
&resp_buftype, CIFS_LOG_ERROR);
rsp = (struct smb2_read_rsp *)iov[0].iov_base;
if (rsp->hdr.Status == STATUS_END_OF_FILE) {
free_rsp_buf(resp_buftype, iov[0].iov_base);
return 0;
}
if (rc) {
cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
cifs_dbg(VFS, "Send error in read = %d\n", rc);
} else {
*nbytes = le32_to_cpu(rsp->DataLength);
if ((*nbytes > CIFS_MAX_MSGSIZE) ||
(*nbytes > io_parms->length)) {
cifs_dbg(FYI, "bad length %d for count %d\n",
*nbytes, io_parms->length);
rc = -EIO;
*nbytes = 0;
}
}
if (*buf) {
memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
*nbytes);
free_rsp_buf(resp_buftype, iov[0].iov_base);
} else if (resp_buftype != CIFS_NO_BUFFER) {
*buf = iov[0].iov_base;
if (resp_buftype == CIFS_SMALL_BUFFER)
*buf_type = CIFS_SMALL_BUFFER;
else if (resp_buftype == CIFS_LARGE_BUFFER)
*buf_type = CIFS_LARGE_BUFFER;
}
return rc;
}
/*
* Check the mid_state and signature on received buffer (if any), and queue the
* workqueue completion task.
*/
static void
smb2_writev_callback(struct mid_q_entry *mid)
{
struct cifs_writedata *wdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
unsigned int written;
struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
unsigned int credits_received = 1;
switch (mid->mid_state) {
case MID_RESPONSE_RECEIVED:
credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
if (wdata->result != 0)
break;
written = le32_to_cpu(rsp->DataLength);
/*
* Mask off high 16 bits when bytes written as returned
* by the server is greater than bytes requested by the
* client. OS/2 servers are known to set incorrect
* CountHigh values.
*/
if (written > wdata->bytes)
written &= 0xFFFF;
if (written < wdata->bytes)
wdata->result = -ENOSPC;
else
wdata->bytes = written;
break;
case MID_REQUEST_SUBMITTED:
case MID_RETRY_NEEDED:
wdata->result = -EAGAIN;
break;
default:
wdata->result = -EIO;
break;
}
if (wdata->result)
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
queue_work(cifsiod_wq, &wdata->work);
DeleteMidQEntry(mid);
add_credits(tcon->ses->server, credits_received, 0);
}
/* smb2_async_writev - send an async write, and set up mid to handle result */
int
smb2_async_writev(struct cifs_writedata *wdata,
void (*release)(struct kref *kref))
{
int rc = -EACCES;
struct smb2_write_req *req = NULL;
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
struct kvec iov;
struct smb_rqst rqst;
rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
if (rc)
goto async_writev_out;
req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
req->PersistentFileId = wdata->cfile->fid.persistent_fid;
req->VolatileFileId = wdata->cfile->fid.volatile_fid;
req->WriteChannelInfoOffset = 0;
req->WriteChannelInfoLength = 0;
req->Channel = 0;
req->Offset = cpu_to_le64(wdata->offset);
/* 4 for rfc1002 length field */
req->DataOffset = cpu_to_le16(
offsetof(struct smb2_write_req, Buffer) - 4);
req->RemainingBytes = 0;
/* 4 for rfc1002 length field and 1 for Buffer */
iov.iov_len = get_rfc1002_length(req) + 4 - 1;
iov.iov_base = req;
rqst.rq_iov = &iov;
rqst.rq_nvec = 1;
rqst.rq_pages = wdata->pages;
rqst.rq_npages = wdata->nr_pages;
rqst.rq_pagesz = wdata->pagesz;
rqst.rq_tailsz = wdata->tailsz;
cifs_dbg(FYI, "async write at %llu %u bytes\n",
wdata->offset, wdata->bytes);
req->Length = cpu_to_le32(wdata->bytes);
inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
kref_get(&wdata->refcount);
rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
smb2_writev_callback, wdata, 0);
if (rc) {
kref_put(&wdata->refcount, release);
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
}
async_writev_out:
cifs_small_buf_release(req);
return rc;
}
/*
* SMB2_write function gets iov pointer to kvec array with n_vec as a length.
* The length field from io_parms must be at least 1 and indicates a number of
* elements with data to write that begins with position 1 in iov array. All
* data length is specified by count.
*/
int
SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
unsigned int *nbytes, struct kvec *iov, int n_vec)
{
int rc = 0;
struct smb2_write_req *req = NULL;
struct smb2_write_rsp *rsp = NULL;
int resp_buftype;
*nbytes = 0;
if (n_vec < 1)
return rc;
rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
if (rc)
return rc;
if (io_parms->tcon->ses->server == NULL)
return -ECONNABORTED;
req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
req->PersistentFileId = io_parms->persistent_fid;
req->VolatileFileId = io_parms->volatile_fid;
req->WriteChannelInfoOffset = 0;
req->WriteChannelInfoLength = 0;
req->Channel = 0;
req->Length = cpu_to_le32(io_parms->length);
req->Offset = cpu_to_le64(io_parms->offset);
/* 4 for rfc1002 length field */
req->DataOffset = cpu_to_le16(
offsetof(struct smb2_write_req, Buffer) - 4);
req->RemainingBytes = 0;
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field and 1 for Buffer */
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
/* length of entire message including data to be written */
inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
&resp_buftype, 0);
rsp = (struct smb2_write_rsp *)iov[0].iov_base;
if (rc) {
cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
cifs_dbg(VFS, "Send error in write = %d\n", rc);
} else
*nbytes = le32_to_cpu(rsp->DataLength);
free_rsp_buf(resp_buftype, rsp);
return rc;
}
static unsigned int
num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
{
int len;
unsigned int entrycount = 0;
unsigned int next_offset = 0;
char *entryptr;
FILE_DIRECTORY_INFO *dir_info;
if (bufstart == NULL)
return 0;
entryptr = bufstart;
while (1) {
if (entryptr + next_offset < entryptr ||
entryptr + next_offset > end_of_buf ||
entryptr + next_offset + size > end_of_buf) {
cifs_dbg(VFS, "malformed search entry would overflow\n");
break;
}
entryptr = entryptr + next_offset;
dir_info = (FILE_DIRECTORY_INFO *)entryptr;
len = le32_to_cpu(dir_info->FileNameLength);
if (entryptr + len < entryptr ||
entryptr + len > end_of_buf ||
entryptr + len + size > end_of_buf) {
cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
end_of_buf);
break;
}
*lastentry = entryptr;
entrycount++;
next_offset = le32_to_cpu(dir_info->NextEntryOffset);
if (!next_offset)
break;
}
return entrycount;
}
/*
* Readdir/FindFirst
*/
int
SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, int index,
struct cifs_search_info *srch_inf)
{
struct smb2_query_directory_req *req;
struct smb2_query_directory_rsp *rsp = NULL;
struct kvec iov[2];
int rc = 0;
int len;
int resp_buftype;
unsigned char *bufptr;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
__le16 asteriks = cpu_to_le16('*');
char *end_of_smb;
unsigned int output_size = CIFSMaxBufSize;
size_t info_buf_size;
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
if (rc)
return rc;
switch (srch_inf->info_level) {
case SMB_FIND_FILE_DIRECTORY_INFO:
req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
break;
case SMB_FIND_FILE_ID_FULL_DIR_INFO:
req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
break;
default:
cifs_dbg(VFS, "info level %u isn't supported\n",
srch_inf->info_level);
rc = -EINVAL;
goto qdir_exit;
}
req->FileIndex = cpu_to_le32(index);
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
len = 0x2;
bufptr = req->Buffer;
memcpy(bufptr, &asteriks, len);
req->FileNameOffset =
cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
req->FileNameLength = cpu_to_le16(len);
/*
* BB could be 30 bytes or so longer if we used SMB2 specific
* buffer lengths, but this is safe and close enough.
*/
output_size = min_t(unsigned int, output_size, server->maxBuf);
output_size = min_t(unsigned int, output_size, 2 << 15);
req->OutputBufferLength = cpu_to_le32(output_size);
iov[0].iov_base = (char *)req;
/* 4 for RFC1001 length and 1 for Buffer */
iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
iov[1].iov_base = (char *)(req->Buffer);
iov[1].iov_len = len;
inc_rfc1001_len(req, len - 1 /* Buffer */);
rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
if (rc) {
if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
srch_inf->endOfSearch = true;
rc = 0;
}
cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
goto qdir_exit;
}
rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
info_buf_size);
if (rc)
goto qdir_exit;
srch_inf->unicode = true;
if (srch_inf->ntwrk_buf_start) {
if (srch_inf->smallBuf)
cifs_small_buf_release(srch_inf->ntwrk_buf_start);
else
cifs_buf_release(srch_inf->ntwrk_buf_start);
}
srch_inf->ntwrk_buf_start = (char *)rsp;
srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
(char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
/* 4 for rfc1002 length field */
end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
srch_inf->entries_in_buffer =
num_entries(srch_inf->srch_entries_start, end_of_smb,
&srch_inf->last_entry, info_buf_size);
srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
srch_inf->srch_entries_start, srch_inf->last_entry);
if (resp_buftype == CIFS_LARGE_BUFFER)
srch_inf->smallBuf = false;
else if (resp_buftype == CIFS_SMALL_BUFFER)
srch_inf->smallBuf = true;
else
cifs_dbg(VFS, "illegal search buffer type\n");
return rc;
qdir_exit:
free_rsp_buf(resp_buftype, rsp);
return rc;
}
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
unsigned int num, void **data, unsigned int *size)
{
struct smb2_set_info_req *req;
struct smb2_set_info_rsp *rsp = NULL;
struct kvec *iov;
int rc = 0;
int resp_buftype;
unsigned int i;
struct TCP_Server_Info *server;
struct cifs_ses *ses = tcon->ses;
if (ses && (ses->server))
server = ses->server;
else
return -EIO;
if (!num)
return -EINVAL;
iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
if (!iov)
return -ENOMEM;
rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
if (rc) {
kfree(iov);
return rc;
}
req->hdr.ProcessId = cpu_to_le32(pid);
req->InfoType = SMB2_O_INFO_FILE;
req->FileInfoClass = info_class;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
/* 4 for RFC1001 length and 1 for Buffer */
req->BufferOffset =
cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
req->BufferLength = cpu_to_le32(*size);
inc_rfc1001_len(req, *size - 1 /* Buffer */);
memcpy(req->Buffer, *data, *size);
iov[0].iov_base = (char *)req;
/* 4 for RFC1001 length */
iov[0].iov_len = get_rfc1002_length(req) + 4;
for (i = 1; i < num; i++) {
inc_rfc1001_len(req, size[i]);
le32_add_cpu(&req->BufferLength, size[i]);
iov[i].iov_base = (char *)data[i];
iov[i].iov_len = size[i];
}
rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
if (rc != 0)
cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
free_rsp_buf(resp_buftype, rsp);
kfree(iov);
return rc;
}
int
SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
{
struct smb2_file_rename_info info;
void **data;
unsigned int size[2];
int rc;
int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
if (!data)
return -ENOMEM;
info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
/* 0 = fail if target already exists */
info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
info.FileNameLength = cpu_to_le32(len);
data[0] = &info;
size[0] = sizeof(struct smb2_file_rename_info);
data[1] = target_file;
size[1] = len + 2 /* null */;
rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
current->tgid, FILE_RENAME_INFORMATION, 2, data,
size);
kfree(data);
return rc;
}
int
SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid)
{
__u8 delete_pending = 1;
void *data;
unsigned int size;
data = &delete_pending;
size = 1; /* sizeof __u8 */
return send_set_info(xid, tcon, persistent_fid, volatile_fid,
current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
&size);
}
int
SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
{
struct smb2_file_link_info info;
void **data;
unsigned int size[2];
int rc;
int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
if (!data)
return -ENOMEM;
info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
/* 0 = fail if link already exists */
info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */
info.FileNameLength = cpu_to_le32(len);
data[0] = &info;
size[0] = sizeof(struct smb2_file_link_info);
data[1] = target_file;
size[1] = len + 2 /* null */;
rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
current->tgid, FILE_LINK_INFORMATION, 2, data, size);
kfree(data);
return rc;
}
int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
u64 volatile_fid, u32 pid, __le64 *eof)
{
struct smb2_file_eof_info info;
void *data;
unsigned int size;
info.EndOfFile = *eof;
data = &info;
size = sizeof(struct smb2_file_eof_info);
return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
}
int
SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
{
unsigned int size;
size = sizeof(FILE_BASIC_INFO);
return send_set_info(xid, tcon, persistent_fid, volatile_fid,
current->tgid, FILE_BASIC_INFORMATION, 1,
(void **)&buf, &size);
}
int
SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
const u64 persistent_fid, const u64 volatile_fid,
__u8 oplock_level)
{
int rc;
struct smb2_oplock_break *req = NULL;
cifs_dbg(FYI, "SMB2_oplock_break\n");
rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
if (rc)
return rc;
req->VolatileFid = volatile_fid;
req->PersistentFid = persistent_fid;
req->OplockLevel = oplock_level;
req->hdr.CreditRequest = cpu_to_le16(1);
rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
/* SMB2 buffer freed by function above */
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
}
return rc;
}
static void
copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
struct kstatfs *kst)
{
kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
kst->f_bfree = kst->f_bavail =
le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
return;
}
static int
build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
int outbuf_len, u64 persistent_fid, u64 volatile_fid)
{
int rc;
struct smb2_query_info_req *req;
cifs_dbg(FYI, "Query FSInfo level %d\n", level);
if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
return -EIO;
rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
if (rc)
return rc;
req->InfoType = SMB2_O_INFO_FILESYSTEM;
req->FileInfoClass = level;
req->PersistentFileId = persistent_fid;
req->VolatileFileId = volatile_fid;
/* 4 for rfc1002 length field and 1 for pad */
req->InputBufferOffset =
cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
req->OutputBufferLength = cpu_to_le32(
outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
iov->iov_base = (char *)req;
/* 4 for rfc1002 length field */
iov->iov_len = get_rfc1002_length(req) + 4;
return 0;
}
int
SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov;
int rc = 0;
int resp_buftype;
struct cifs_ses *ses = tcon->ses;
struct smb2_fs_full_size_info *info = NULL;
rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
sizeof(struct smb2_fs_full_size_info),
persistent_fid, volatile_fid);
if (rc)
return rc;
rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qfsinf_exit;
}
rsp = (struct smb2_query_info_rsp *)iov.iov_base;
info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
sizeof(struct smb2_fs_full_size_info));
if (!rc)
copy_fs_info_to_kstatfs(info, fsdata);
qfsinf_exit:
free_rsp_buf(resp_buftype, iov.iov_base);
return rc;
}
int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, int level)
{
struct smb2_query_info_rsp *rsp = NULL;
struct kvec iov;
int rc = 0;
int resp_buftype, max_len, min_len;
struct cifs_ses *ses = tcon->ses;
unsigned int rsp_len, offset;
if (level == FS_DEVICE_INFORMATION) {
max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
} else if (level == FS_ATTRIBUTE_INFORMATION) {
max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
min_len = MIN_FS_ATTR_INFO_SIZE;
} else if (level == FS_SECTOR_SIZE_INFORMATION) {
max_len = sizeof(struct smb3_fs_ss_info);
min_len = sizeof(struct smb3_fs_ss_info);
} else if (level == FS_VOLUME_INFORMATION) {
max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
min_len = sizeof(struct smb3_fs_vol_info);
} else {
cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
return -EINVAL;
}
rc = build_qfs_info_req(&iov, tcon, level, max_len,
persistent_fid, volatile_fid);
if (rc)
return rc;
rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
if (rc) {
cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
goto qfsattr_exit;
}
rsp = (struct smb2_query_info_rsp *)iov.iov_base;
rsp_len = le32_to_cpu(rsp->OutputBufferLength);
offset = le16_to_cpu(rsp->OutputBufferOffset);
rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
if (rc)
goto qfsattr_exit;
if (level == FS_ATTRIBUTE_INFORMATION)
memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
+ (char *)&rsp->hdr, min_t(unsigned int,
rsp_len