From: Pavel Shilovsky <piastry@xxxxxxxxxxx>
and add negotiate request type to let set_credits know that
we are only on negotiate stage and no need to make a decision
about disabling echos and oplocks.
Signed-off-by: Pavel Shilovsky <piastry@xxxxxxxxxxx>
---
fs/cifs/Makefile | 3 +-
fs/cifs/cifsglob.h | 7 +-
fs/cifs/smb2misc.c | 7 +-
fs/cifs/smb2ops.c | 22 ++++-
fs/cifs/smb2pdu.c | 333 +++++++++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/smb2pdu.h | 39 ++++++
fs/cifs/smb2proto.h | 7 +
7 files changed, 414 insertions(+), 4 deletions(-)
create mode 100644 fs/cifs/smb2pdu.c
diff --git a/fs/cifs/Makefile b/fs/cifs/Makefile
index b77e9ec..daf6837 100644
--- a/fs/cifs/Makefile
+++ b/fs/cifs/Makefile
@@ -16,4 +16,5 @@ cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o
cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
-cifs-$(CONFIG_CIFS_SMB2) += smb2ops.o smb2maperror.o smb2transport.o smb2misc.o
+cifs-$(CONFIG_CIFS_SMB2) += smb2ops.o smb2maperror.o smb2transport.o \
+ smb2misc.o smb2pdu.o
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 6c062e2..119c501 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -393,6 +393,10 @@ struct TCP_Server_Info {
atomic_t in_send; /* requests trying to send */
atomic_t num_waiters; /* blocked waiting to get in sendrecv */
#endif
+#ifdef CONFIG_CIFS_SMB2
+ unsigned int max_read;
+ unsigned int max_write;
+#endif /* CONFIG_CIFS_SMB2 */
};
static inline unsigned int
@@ -986,7 +990,8 @@ static inline void free_dfs_info_array(struct dfs_info3_param *param,
/* Type of request operation */
#define CIFS_ECHO_OP 0x080 /* echo request */
#define CIFS_OBREAK_OP 0x0100 /* oplock break request */
-#define CIFS_OP_MASK 0x0180 /* mask request type */
+#define CIFS_NEG_OP 0x0200 /* negotiate request */
+#define CIFS_OP_MASK 0x0380 /* mask request type */
/* Security Flags: indicate type of session setup needed */
#define CIFSSEC_MAY_SIGN 0x00001
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index 03167eb..1cea426 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -198,7 +198,7 @@ static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
* 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 *
+char *
smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
{
*off = 0;
@@ -217,6 +217,11 @@ smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
*/
switch (hdr->Command) {
case SMB2_NEGOTIATE:
+ *off = le16_to_cpu(
+ ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
+ *len = le16_to_cpu(
+ ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
+ break;
case SMB2_SESSION_SETUP:
case SMB2_CREATE:
case SMB2_READ:
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 696525f..b980d18 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -61,7 +61,7 @@ smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
val = server->ops->get_credits_field(server, optype);
*val += add;
server->in_flight--;
- if (server->in_flight == 0)
+ if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
change_conf(server);
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
@@ -138,6 +138,24 @@ smb2_dump_detail(void *buf)
#endif
}
+static bool
+smb2_need_neg(struct TCP_Server_Info *server)
+{
+ return server->max_read == 0;
+}
+
+static int
+smb2_negotiate(const int xid, struct cifs_ses *ses)
+{
+ int rc;
+ ses->server->CurrentMid = 0;
+ rc = SMB2_negotiate(xid, ses);
+ /* BB we probably don't need to retry with modern servers */
+ if (rc == -EAGAIN)
+ rc = -EHOSTDOWN;
+ return rc;
+}
+
struct smb_version_operations smb21_operations = {
.setup_request = smb2_setup_request,
.check_receive = smb2_check_receive,
@@ -149,6 +167,8 @@ struct smb_version_operations smb21_operations = {
.find_mid = smb2_find_mid,
.check_message = smb2_check_message,
.dump_detail = smb2_dump_detail,
+ .need_neg = smb2_need_neg,
+ .negotiate = smb2_negotiate,
};
struct smb_version_values smb21_values = {
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
new file mode 100644
index 0000000..21e291a
--- /dev/null
+++ b/fs/cifs/smb2pdu.c
@@ -0,0 +1,333 @@
+/*
+ * fs/cifs/smb2pdu.c
+ *
+ * Copyright (C) International Business Machines Corp., 2009, 2011
+ * Etersoft, 2012
+ * Author(s): Steve French (sfrench@xxxxxxxxxx)
+ * Pavel Shilovsky (pshilovsky@xxxxxxxxx) 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/uaccess.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"
+
+/*
+ * 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 */
+};
+
+
+/*
+ * NB: MID can not be set if tcon not passed in, in that
+ * case it is responsbility of caller to set the mid
+ */
+static void
+smb2_hdr_assemble(struct smb2_hdr *buffer, __le16 smb2_cmd /* command */ ,
+ const struct cifs_tcon *tcon)
+{
+ struct smb2_pdu *smb = (struct smb2_pdu *)buffer;
+ char *temp = (char *) buffer;
+ /* 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 */
+ buffer->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
+ - 4 /* RFC 1001 length field itself not counted */);
+
+ buffer->ProtocolId[0] = 0xFE;
+ buffer->ProtocolId[1] = 'S';
+ buffer->ProtocolId[2] = 'M';
+ buffer->ProtocolId[3] = 'B';
+ buffer->StructureSize = cpu_to_le16(64);
+ buffer->Command = smb2_cmd;
+ buffer->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
+ buffer->ProcessId = cpu_to_le32((__u16)current->tgid);
+
+ if (!tcon)
+ goto out;
+
+ buffer->TreeId = tcon->tid;
+ /* Uid is not converted */
+ if (tcon->ses)
+ buffer->SessionId = tcon->ses->Suid;
+ /* BB check following DFS flags BB */
+ /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
+ /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
+ buffer->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
+ /* BB how does SMB2 do case sensitive? */
+ /* if (tcon->nocase)
+ buffer->Flags |= SMBFLG_CASELESS; */
+ /* if (tcon->ses && tcon->ses->server &&
+ (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
+ buffer->Flags |= SMB2_FLAGS_SIGNED; */
+out:
+ smb->StructureSize2 = cpu_to_le16(parmsize);
+ return;
+}
+
+static int
+smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
+{
+ int rc = 0;
+ /* BB add missing code here */
+ return rc;
+}
+
+/*
+ * Allocate and return pointer to an SMB request buffer, 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 *pSMB2r)
+{
+ if (resp_buftype == CIFS_SMALL_BUFFER)
+ cifs_small_buf_release(pSMB2r);
+ else if (resp_buftype == CIFS_LARGE_BUFFER)
+ cifs_buf_release(pSMB2r);
+}
+
+#define SMB2_NUM_PROT 1
+
+#define SMB2_PROT 0
+#define SMB21_PROT 1
+#define BAD_PROT 0xFFFF
+
+#define SMB2_PROT_ID 0x0202
+#define SMB21_PROT_ID 0x0210
+#define BAD_PROT_ID 0xFFFF
+
+static struct {
+ int index;
+ __le16 name;
+} smb2protocols[] = {
+ {SMB2_PROT, cpu_to_le16(SMB2_PROT_ID)},
+ {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)},
+ {BAD_PROT, cpu_to_le16(BAD_PROT_ID)}
+};
+
+/*
+ *
+ * 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 int xid, struct cifs_ses *ses)
+{
+ struct smb2_negotiate_req *pSMB2;
+ struct smb2_negotiate_rsp *pSMB2r;
+ struct kvec iov[1];
+ int rc = 0;
+ int resp_buftype;
+ struct TCP_Server_Info *server;
+ unsigned int sec_flags;
+ u16 i;
+ u16 temp = 0;
+ int blob_offset, blob_length;
+ char *security_blob;
+ int flags = CIFS_NEG_OP;
+
+ cFYI(1, "Negotiate protocol");
+
+ if (ses->server)
+ server = ses->server;
+ else {
+ rc = -EIO;
+ return rc;
+ }
+
+ rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &pSMB2);
+ if (rc)
+ return rc;
+
+ /* if any of auth flags (ie not sign or seal) are overriden use them */
+ if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
+ sec_flags = ses->overrideSecFlg; /* BB FIXME fix sign flags?*/
+ else /* if override flags set only sign/seal OR them with global auth */
+ sec_flags = global_secflags | ses->overrideSecFlg;
+
+ cFYI(1, "sec_flags 0x%x", sec_flags);
+
+ pSMB2->hdr.SessionId = 0;
+
+ for (i = 0; i < SMB2_NUM_PROT; i++)
+ pSMB2->Dialects[i] = smb2protocols[i].name;
+
+ pSMB2->DialectCount = cpu_to_le16(i);
+ pSMB2->hdr.smb2_buf_length =
+ cpu_to_be32(be32_to_cpu(pSMB2->hdr.smb2_buf_length) + (i * 2));
+
+ /* only one of SMB2 signing flags may be set in SMB2 request */
+ if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
+ temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
+ else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
+ temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
+
+ pSMB2->SecurityMode = cpu_to_le16(temp);
+
+ pSMB2->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
+
+ iov[0].iov_base = (char *)pSMB2;
+ iov[0].iov_len = be32_to_cpu(pSMB2->hdr.smb2_buf_length) + 4;
+
+ rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
+
+ pSMB2r = (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;
+
+ if (pSMB2r == NULL) {
+ rc = -EIO;
+ goto neg_exit;
+ }
+
+ cFYI(1, "mode 0x%x", pSMB2r->SecurityMode);
+
+ if (pSMB2r->DialectRevision == smb2protocols[SMB21_PROT].name)
+ cFYI(1, "negotiated smb2.1 dialect");
+ else if (pSMB2r->DialectRevision == smb2protocols[SMB2_PROT].name)
+ cFYI(1, "negotiated smb2 dialect");
+ else {
+ cERROR(1, "Illegal dialect returned by server %d",
+ le16_to_cpu(pSMB2r->DialectRevision));
+ rc = -EIO;
+ goto neg_exit;
+ }
+ ses->server->dialect = le16_to_cpu(pSMB2r->DialectRevision);
+
+ ses->server->maxBuf = le32_to_cpu(pSMB2r->MaxTransactSize);
+ ses->server->max_read = le32_to_cpu(pSMB2r->MaxReadSize);
+ ses->server->max_write = le32_to_cpu(pSMB2r->MaxWriteSize);
+ /* BB Do we need to validate the SecurityMode? */
+ ses->server->sec_mode = le16_to_cpu(pSMB2r->SecurityMode);
+ ses->server->capabilities = le32_to_cpu(pSMB2r->Capabilities);
+
+ security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
+ &pSMB2r->hdr);
+ if (blob_length == 0) {
+ cERROR(1, "missing security blob on negprot");
+ rc = -EIO;
+ goto neg_exit;
+ }
+#ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
+ rc = decode_neg_token_init(security_blob, blob_length,
+ &ses->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, pSMB2r);
+ return rc;
+}
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 0a17588..8eeef10 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -142,4 +142,43 @@ struct smb2_err_rsp {
__u8 ErrorData[1]; /* variable length */
} __packed;
+struct smb2_negotiate_req {
+ struct smb2_hdr hdr;
+ __le16 StructureSize; /* Must be 36 */
+ __le16 DialectCount;
+ __le16 SecurityMode;
+ __le16 Reserved; /* MBZ */
+ __le32 Capabilities;
+ __u8 ClientGUID[16]; /* MBZ */
+ __le64 ClientStartTime; /* MBZ */
+ __le16 Dialects[2]; /* variable length */ /* Must include 0x0202 */
+} __packed;
+
+/* SecurityMode flags */
+#define SMB2_NEGOTIATE_SIGNING_ENABLED 0x0001
+#define SMB2_NEGOTIATE_SIGNING_REQUIRED 0x0002
+/* Capabilities flags */
+#define SMB2_GLOBAL_CAP_DFS 0x00000001
+#define SMB2_GLOBAL_CAP_LEASING 0x00000002 /* Resp only New to SMB2.1 */
+#define SMB2_GLOBAL_CAP_LARGE_MTU 0X00000004 /* Resp only New to SMB2.1 */
+
+struct smb2_negotiate_rsp {
+ struct smb2_hdr hdr;
+ __le16 StructureSize; /* Must be 65 */
+ __le16 SecurityMode;
+ __le16 DialectRevision; /* Should be 0x0202 */
+ __le16 Reserved; /* MBZ */
+ __u8 ServerGUID[16];
+ __le32 Capabilities;
+ __le32 MaxTransactSize;
+ __le32 MaxReadSize;
+ __le32 MaxWriteSize;
+ __le64 SystemTime; /* MBZ */
+ __le64 ServerStartTime;
+ __le16 SecurityBufferOffset;
+ __le16 SecurityBufferLength;
+ __le32 Reserved2; /* may be any value, Ignore */
+ __u8 Buffer[1]; /* variable length GSS security buffer */
+} __packed;
+
#endif /* _SMB2PDU_H */
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 19bf987..a4c3c3d 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -35,10 +35,17 @@ 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 char *smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr);
extern int smb2_check_receive(struct mid_q_entry *mid,
struct TCP_Server_Info *server, bool log_error);
extern int smb2_setup_request(struct cifs_ses *ses, struct kvec *iov,
unsigned int nvec, struct mid_q_entry **ret_mid);
+/*
+ * SMB2 Worker functions - most of protocol specific implementation details
+ * are contained within these calls
+ */
+extern int SMB2_negotiate(const int xid, struct cifs_ses *ses);
+
#endif /* _SMB2PROTO_H */
--
1.7.1
--
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