From: Pavel Shilovsky <piastryyy@xxxxxxxxx>
Now we can process SMB2 messages: check message, get message id
and wakeup awaiting routines.
Signed-off-by: Pavel Shilovsky <piastryyy@xxxxxxxxx>
---
fs/cifs/Makefile | 2 +-
fs/cifs/cifs_debug.c | 2 +-
fs/cifs/smb2misc.c | 304 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/smb2ops.c | 37 ++++++
fs/cifs/smb2pdu.h | 30 +++++
fs/cifs/smb2proto.h | 2 +
6 files changed, 375 insertions(+), 2 deletions(-)
create mode 100644 fs/cifs/smb2misc.c
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index a73d7f8..b77e9ec 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -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
diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index e814052..8aa8693 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -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 */
}
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
new file mode 100644
index 0000000..03167eb
--- /dev/null
+++ b/fs/cifs/smb2misc.c
@@ -0,0 +1,304 @@
+/*
+ * fs/cifs/smb2misc.c
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2011
+ * Etersoft, 2012
+ * Author(s): Steve French (sfrench@xxxxxxxxxx)
+ * Pavel Shilovsky (pshilovsky@xxxxxxxxx) 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 == cpu_to_le32(0x424d53fe)) &&
+ (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 != cpu_to_le32(0x424d53fe))
+ 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 int smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
+ /* SMB2_NEGOTIATE */ 65,
+ /* SMB2_SESSION_SETUP */ 9,
+ /* SMB2_LOGOFF */ 4,
+ /* SMB2_TREE_CONNECT */ 16,
+ /* SMB2_TREE_DISCONNECT */ 4,
+ /* SMB2_CREATE */ 89,
+ /* SMB2_CLOSE */ 60,
+ /* SMB2_FLUSH */ 4,
+ /* SMB2_READ */ 17,
+ /* SMB2_WRITE */ 17,
+ /* SMB2_LOCK */ 4,
+ /* SMB2_IOCTL */ 49,
+ /* SMB2_CANCEL */ 0, /* BB CHECK this ... not listed in documentation */
+ /* SMB2_ECHO */ 4,
+ /* SMB2_QUERY_DIRECTORY */ 9,
+ /* SMB2_CHANGE_NOTIFY */ 9,
+ /* SMB2_QUERY_INFO */ 9,
+ /* SMB2_SET_INFO */ 2,
+ /* SMB2_OPLOCK_BREAK */ 24 /* BB FIXME can also be 44 for lease break */
+};
+
+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, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", 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 (le16_to_cpu(hdr->StructureSize) != 64) {
+ 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] !=
+ le16_to_cpu(pdu->StructureSize2)) {
+ if ((hdr->Status == 0) ||
+ (le16_to_cpu(pdu->StructureSize2) != 9)) {
+ /* error packets have 9 byte structure size */
+ cERROR(1, "Illegal response size %d for command %d",
+ le16_to_cpu(pdu->StructureSize2), command);
+ return 1;
+ }
+ }
+
+ clc_len = smb2_calc_size(hdr);
+
+ if (4 + len != length) {
+ cERROR(1, "Length read does not match RFC1001 length %d",
+ len);
+ return 1;
+ }
+
+ if (4 + len != clc_len) {
+ cFYI(1, "Calculated size %d length %d mismatch for mid %lld",
+ 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 &&
+ (le32_to_cpu(hdr->Status) != STATUS_MORE_PROCESSING_REQUIRED) &&
+ (le16_to_cpu(((struct smb2_err_rsp *)hdr)->StructureSize) == 9))
+ 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) {
+ dump_stack();
+ cERROR(1, "offset %d too large, data area ignored", *off);
+ *len = 0;
+ *off = 0;
+ } else if (*off < 0) {
+ cERROR(1, "negative offset to data invalid ignore data area");
+ *off = 0;
+ *len = 0;
+ } else if (*len < 0) {
+ cERROR(1, "negative data length invalid, data area ignored");
+ *len = 0;
+ } else if (*len > 128 * 1024) {
+ cERROR(1, "data area larger than 128K");
+ *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 overlaps SMB2 header, ignoring");
+ data_length = 0;
+ } else {
+ len = 4 + offset + data_length;
+ }
+ }
+calc_size_exit:
+ cFYI(1, "smb2 len %d", len);
+ return len;
+}
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index ab2590f..88cbfce 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -105,6 +105,38 @@ 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,
@@ -113,9 +145,14 @@ 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,
};
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index c7f52e3..efb0d98 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -112,4 +112,34 @@ 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 cpu_to_le32(0x00000001) /* Response */
+#define SMB2_FLAGS_ASYNC_COMMAND cpu_to_le32(0x00000002)
+#define SMB2_FLAGS_RELATED_OPERATIONS cpu_to_le32(0x00000004)
+#define SMB2_FLAGS_SIGNED cpu_to_le32(0x00000008)
+#define SMB2_FLAGS_DFS_OPERATIONS 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 */
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 0e59afb..19bf987 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.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);
--
1.7.1
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