Commit 093b2bda authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Pavel Shilovsky

CIFS: Make demultiplex_thread work with SMB2 code

Now we can process SMB2 messages: check message, get message id
and wakeup awaiting routines.
Signed-off-by: default avatarPavel Shilovsky <piastryyy@gmail.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent 4b124100
......@@ -16,4 +16,4 @@ cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o
cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
cifs-$(CONFIG_CIFS_SMB2) += smb2ops.o smb2maperror.o smb2transport.o
cifs-$(CONFIG_CIFS_SMB2) += smb2ops.o smb2maperror.o smb2transport.o smb2misc.o
......@@ -65,7 +65,7 @@ void cifs_dump_detail(void *buf)
cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d",
smb->Command, smb->Status.CifsError,
smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
cERROR(1, "smb buf %p len %d", smb, smbCalcSize(smb));
cERROR(1, "smb buf %p len %u", smb, smbCalcSize(smb));
#endif /* CONFIG_CIFS_DEBUG2 */
}
......
/*
* fs/cifs/smb2misc.c
*
* Copyright (C) International Business Machines Corp., 2002,2011
* Etersoft, 2012
* Author(s): Steve French (sfrench@us.ibm.com)
* Pavel Shilovsky (pshilovsky@samba.org) 2012
*
* 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
*/
#include <linux/ctype.h>
#include "smb2pdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "smb2status.h"
static int
check_smb2_hdr(struct smb2_hdr *hdr, __u64 mid)
{
/*
* Make sure that this really is an SMB, that it is a response,
* and that the message ids match.
*/
if ((*(__le32 *)hdr->ProtocolId == SMB2_PROTO_NUMBER) &&
(mid == hdr->MessageId)) {
if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
return 0;
else {
/* only one valid case where server sends us request */
if (hdr->Command == SMB2_OPLOCK_BREAK)
return 0;
else
cERROR(1, "Received Request not response");
}
} else { /* bad signature or mid */
if (*(__le32 *)hdr->ProtocolId != SMB2_PROTO_NUMBER)
cERROR(1, "Bad protocol string signature header %x",
*(unsigned int *) hdr->ProtocolId);
if (mid != hdr->MessageId)
cERROR(1, "Mids do not match");
}
cERROR(1, "Bad SMB detected. The Mid=%llu", hdr->MessageId);
return 1;
}
/*
* The following table defines the expected "StructureSize" of SMB2 responses
* in order by SMB2 command. This is similar to "wct" in SMB/CIFS responses.
*
* Note that commands are defined in smb2pdu.h in le16 but the array below is
* indexed by command in host byte order
*/
static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
/* SMB2_NEGOTIATE */ __constant_cpu_to_le16(65),
/* SMB2_SESSION_SETUP */ __constant_cpu_to_le16(9),
/* SMB2_LOGOFF */ __constant_cpu_to_le16(4),
/* SMB2_TREE_CONNECT */ __constant_cpu_to_le16(16),
/* SMB2_TREE_DISCONNECT */ __constant_cpu_to_le16(4),
/* SMB2_CREATE */ __constant_cpu_to_le16(89),
/* SMB2_CLOSE */ __constant_cpu_to_le16(60),
/* SMB2_FLUSH */ __constant_cpu_to_le16(4),
/* SMB2_READ */ __constant_cpu_to_le16(17),
/* SMB2_WRITE */ __constant_cpu_to_le16(17),
/* SMB2_LOCK */ __constant_cpu_to_le16(4),
/* SMB2_IOCTL */ __constant_cpu_to_le16(49),
/* BB CHECK this ... not listed in documentation */
/* SMB2_CANCEL */ __constant_cpu_to_le16(0),
/* SMB2_ECHO */ __constant_cpu_to_le16(4),
/* SMB2_QUERY_DIRECTORY */ __constant_cpu_to_le16(9),
/* SMB2_CHANGE_NOTIFY */ __constant_cpu_to_le16(9),
/* SMB2_QUERY_INFO */ __constant_cpu_to_le16(9),
/* SMB2_SET_INFO */ __constant_cpu_to_le16(2),
/* BB FIXME can also be 44 for lease break */
/* SMB2_OPLOCK_BREAK */ __constant_cpu_to_le16(24)
};
int
smb2_check_message(char *buf, unsigned int length)
{
struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
__u64 mid = hdr->MessageId;
__u32 len = get_rfc1002_length(buf);
__u32 clc_len; /* calculated length */
int command;
/* BB disable following printk later */
cFYI(1, "%s length: 0x%x, smb_buf_length: 0x%x", __func__, length, len);
/*
* Add function to do table lookup of StructureSize by command
* ie Validate the wct via smb2_struct_sizes table above
*/
if (length < 2 + sizeof(struct smb2_hdr)) {
if ((length >= sizeof(struct smb2_hdr)) && (hdr->Status != 0)) {
pdu->StructureSize2 = 0;
/*
* As with SMB/CIFS, on some error cases servers may
* not return wct properly
*/
return 0;
} else {
cERROR(1, "Length less than SMB header size");
}
return 1;
}
if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE - 4) {
cERROR(1, "SMB length greater than maximum, mid=%lld", mid);
return 1;
}
if (check_smb2_hdr(hdr, mid))
return 1;
if (hdr->StructureSize != SMB2_HEADER_SIZE) {
cERROR(1, "Illegal structure size %d",
le16_to_cpu(hdr->StructureSize));
return 1;
}
command = le16_to_cpu(hdr->Command);
if (command >= NUMBER_OF_SMB2_COMMANDS) {
cERROR(1, "Illegal SMB2 command %d", command);
return 1;
}
if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
if (hdr->Status == 0 ||
pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2) {
/* error packets have 9 byte structure size */
cERROR(1, "Illegal response size %u for command %d",
le16_to_cpu(pdu->StructureSize2), command);
return 1;
}
}
if (4 + len != length) {
cERROR(1, "Total length %u RFC1002 length %u mismatch mid %llu",
length, 4 + len, mid);
return 1;
}
clc_len = smb2_calc_size(hdr);
if (4 + len != clc_len) {
cFYI(1, "Calculated size %u length %u mismatch mid %llu",
clc_len, 4 + len, mid);
if (clc_len == 4 + len + 1) /* BB FIXME (fix samba) */
return 0; /* BB workaround Samba 3 bug SessSetup rsp */
return 1;
}
return 0;
}
/*
* The size of the variable area depends on the offset and length fields
* located in different fields for various SMB2 responses. SMB2 responses
* with no variable length info, show an offset of zero for the offset field.
*/
static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
/* SMB2_NEGOTIATE */ true,
/* SMB2_SESSION_SETUP */ true,
/* SMB2_LOGOFF */ false,
/* SMB2_TREE_CONNECT */ false,
/* SMB2_TREE_DISCONNECT */ false,
/* SMB2_CREATE */ true,
/* SMB2_CLOSE */ false,
/* SMB2_FLUSH */ false,
/* SMB2_READ */ true,
/* SMB2_WRITE */ false,
/* SMB2_LOCK */ false,
/* SMB2_IOCTL */ true,
/* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
/* SMB2_ECHO */ false,
/* SMB2_QUERY_DIRECTORY */ true,
/* SMB2_CHANGE_NOTIFY */ true,
/* SMB2_QUERY_INFO */ true,
/* SMB2_SET_INFO */ false,
/* SMB2_OPLOCK_BREAK */ false
};
/*
* Returns the pointer to the beginning of the data area. Length of the data
* area and the offset to it (from the beginning of the smb are also returned.
*/
static char *
smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
{
*off = 0;
*len = 0;
/* error responses do not have data area */
if (hdr->Status && hdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
(((struct smb2_err_rsp *)hdr)->StructureSize) ==
SMB2_ERROR_STRUCTURE_SIZE2)
return NULL;
/*
* Following commands have data areas so we have to get the location
* of the data buffer offset and data buffer length for the particular
* command.
*/
switch (hdr->Command) {
case SMB2_NEGOTIATE:
case SMB2_SESSION_SETUP:
case SMB2_CREATE:
case SMB2_READ:
case SMB2_QUERY_INFO:
case SMB2_QUERY_DIRECTORY:
case SMB2_IOCTL:
case SMB2_CHANGE_NOTIFY:
default:
/* BB FIXME for unimplemented cases above */
cERROR(1, "no length check for command");
break;
}
/*
* Invalid length or offset probably means data area is invalid, but
* we have little choice but to ignore the data area in this case.
*/
if (*off > 4096) {
cERROR(1, "offset %d too large, data area ignored", *off);
*len = 0;
*off = 0;
} else if (*off < 0) {
cERROR(1, "negative offset %d to data invalid ignore data area",
*off);
*off = 0;
*len = 0;
} else if (*len < 0) {
cERROR(1, "negative data length %d invalid, data area ignored",
*len);
*len = 0;
} else if (*len > 128 * 1024) {
cERROR(1, "data area larger than 128K: %d", *len);
*len = 0;
}
/* return pointer to beginning of data area, ie offset from SMB start */
if ((*off != 0) && (*len != 0))
return hdr->ProtocolId + *off;
else
return NULL;
}
/*
* Calculate the size of the SMB message based on the fixed header
* portion, the number of word parameters and the data portion of the message.
*/
unsigned int
smb2_calc_size(struct smb2_hdr *hdr)
{
struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
int offset; /* the offset from the beginning of SMB to data area */
int data_length; /* the length of the variable length data area */
/* Structure Size has already been checked to make sure it is 64 */
int len = 4 + le16_to_cpu(pdu->hdr.StructureSize);
/*
* StructureSize2, ie length of fixed parameter area has already
* been checked to make sure it is the correct length.
*/
len += le16_to_cpu(pdu->StructureSize2);
if (has_smb2_data_area[le16_to_cpu(hdr->Command)] == false)
goto calc_size_exit;
smb2_get_data_area_len(&offset, &data_length, hdr);
cFYI(1, "SMB2 data length %d offset %d", data_length, offset);
if (data_length > 0) {
/*
* Check to make sure that data area begins after fixed area,
* Note that last byte of the fixed area is part of data area
* for some commands, typically those with odd StructureSize,
* so we must add one to the calculation (and 4 to account for
* the size of the RFC1001 hdr.
*/
if (offset + 4 + 1 < len) {
cERROR(1, "data area offset %d overlaps SMB2 header %d",
offset + 4 + 1, len);
data_length = 0;
} else {
len = 4 + offset + data_length;
}
}
calc_size_exit:
cFYI(1, "SMB2 len %d", len);
return len;
}
......@@ -107,6 +107,38 @@ smb2_get_next_mid(struct TCP_Server_Info *server)
return mid;
}
static struct mid_q_entry *
smb2_find_mid(struct TCP_Server_Info *server, char *buf)
{
struct mid_q_entry *mid;
struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
spin_lock(&GlobalMid_Lock);
list_for_each_entry(mid, &server->pending_mid_q, qhead) {
if ((mid->mid == hdr->MessageId) &&
(mid->mid_state == MID_REQUEST_SUBMITTED) &&
(mid->command == hdr->Command)) {
spin_unlock(&GlobalMid_Lock);
return mid;
}
}
spin_unlock(&GlobalMid_Lock);
return NULL;
}
static void
smb2_dump_detail(void *buf)
{
#ifdef CONFIG_CIFS_DEBUG2
struct smb2_hdr *smb = (struct smb2_hdr *)buf;
cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
smb->Command, smb->Status, smb->Flags, smb->MessageId,
smb->ProcessId);
cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
#endif
}
struct smb_version_operations smb21_operations = {
.setup_request = smb2_setup_request,
.check_receive = smb2_check_receive,
......@@ -115,9 +147,14 @@ struct smb_version_operations smb21_operations = {
.get_credits_field = smb2_get_credits_field,
.get_credits = smb2_get_credits,
.get_next_mid = smb2_get_next_mid,
.find_mid = smb2_find_mid,
.check_message = smb2_check_message,
.dump_detail = smb2_dump_detail,
};
struct smb_version_values smb21_values = {
.version_string = SMB21_VERSION_STRING,
.header_size = sizeof(struct smb2_hdr),
.max_header_size = MAX_SMB2_HDR_SIZE,
.lock_cmd = SMB2_LOCK,
};
......@@ -85,6 +85,12 @@
/* BB FIXME - analyze following length BB */
#define MAX_SMB2_HDR_SIZE 0x78 /* 4 len + 64 hdr + (2*24 wct) + 2 bct + 2 pad */
#define SMB2_PROTO_NUMBER __constant_cpu_to_le32(0x424d53fe)
#define SMB2_HEADER_SIZE __constant_le16_to_cpu(64)
#define SMB2_ERROR_STRUCTURE_SIZE2 __constant_le16_to_cpu(9)
/*
* SMB2 Header Definition
*
......@@ -112,4 +118,34 @@ struct smb2_hdr {
__u8 Signature[16];
} __packed;
struct smb2_pdu {
struct smb2_hdr hdr;
__le16 StructureSize2; /* size of wct area (varies, request specific) */
} __packed;
/*
* SMB2 flag definitions
*/
#define SMB2_FLAGS_SERVER_TO_REDIR __constant_cpu_to_le32(0x00000001)
#define SMB2_FLAGS_ASYNC_COMMAND __constant_cpu_to_le32(0x00000002)
#define SMB2_FLAGS_RELATED_OPERATIONS __constant_cpu_to_le32(0x00000004)
#define SMB2_FLAGS_SIGNED __constant_cpu_to_le32(0x00000008)
#define SMB2_FLAGS_DFS_OPERATIONS __constant_cpu_to_le32(0x10000000)
/*
* Definitions for SMB2 Protocol Data Units (network frames)
*
* See MS-SMB2.PDF specification for protocol details.
* The Naming convention is the lower case version of the SMB2
* command code name for the struct. Note that structures must be packed.
*
*/
struct smb2_err_rsp {
struct smb2_hdr hdr;
__le16 StructureSize;
__le16 Reserved; /* MBZ */
__le32 ByteCount; /* even if zero, at least one byte follows */
__u8 ErrorData[1]; /* variable length */
} __packed;
#endif /* _SMB2PDU_H */
......@@ -33,6 +33,8 @@ struct statfs;
*****************************************************************
*/
extern int map_smb2_to_linux_error(char *buf, bool log_err);
extern int smb2_check_message(char *buf, unsigned int length);
extern unsigned int smb2_calc_size(struct smb2_hdr *hdr);
extern int smb2_check_receive(struct mid_q_entry *mid,
struct TCP_Server_Info *server, bool log_error);
......
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