From: Steve French <smfrench@gmail.com>
Date: Mon, 1 Oct 2012 17:26:22 +0000 (-0500)
Subject: [CIFS] Fix SMB2 negotiation support to select only one dialect (based on vers=)
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e4aa25e7801163df058f62c617b859e9d3d4b148;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git
[CIFS] Fix SMB2 negotiation support to select only one dialect (based on vers=)
Based on whether the user (on mount command) chooses:
vers=3.0 (for smb3.0 support)
vers=2.1 (for smb2.1 support)
or (with subsequent patch, which will allow SMB2 support)
vers=2.0 (for original smb2.02 dialect support)
send only one dialect at a time during negotiate (we
had been sending a list).
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
---
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index f6f40635abca..f5af2527fc69 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -179,6 +179,7 @@ struct smb_rqst {
enum smb_version {
Smb_1 = 1,
Smb_21,
+ Smb_30,
};
struct mid_q_entry;
@@ -372,6 +373,8 @@ struct smb_version_operations {
struct smb_version_values {
char *version_string;
+ __u16 protocol_id;
+ __u32 req_capabilities;
__u32 large_lock_type;
__u32 exclusive_lock_type;
__u32 shared_lock_type;
@@ -1496,7 +1499,13 @@ extern mempool_t *cifs_mid_poolp;
#define SMB1_VERSION_STRING "1.0"
extern struct smb_version_operations smb1_operations;
extern struct smb_version_values smb1_values;
+#define SMB20_VERSION_STRING "2.0"
+/*extern struct smb_version_operations smb20_operations; */ /* not needed yet */
+extern struct smb_version_values smb20_values;
#define SMB21_VERSION_STRING "2.1"
extern struct smb_version_operations smb21_operations;
extern struct smb_version_values smb21_values;
+#define SMB30_VERSION_STRING "3.0"
+/*extern struct smb_version_operations smb30_operations; */ /* not needed yet */
+extern struct smb_version_values smb30_values;
#endif /* _CIFS_GLOB_H */
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index a792282f02f7..2fdbe08a7a23 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -272,6 +272,7 @@ static const match_table_t cifs_cacheflavor_tokens = {
static const match_table_t cifs_smb_version_tokens = {
{ Smb_1, SMB1_VERSION_STRING },
{ Smb_21, SMB21_VERSION_STRING },
+ { Smb_30, SMB30_VERSION_STRING },
};
static int ip_connect(struct TCP_Server_Info *server);
@@ -1074,6 +1075,10 @@ cifs_parse_smb_version(char *value, struct smb_vol *vol)
vol->ops = &smb21_operations;
vol->vals = &smb21_values;
break;
+ case Smb_30:
+ vol->ops = &smb21_operations; /* currently identical with 2.1 */
+ vol->vals = &smb30_values;
+ break;
#endif
default:
cERROR(1, "Unknown vers= option specified: %s", value);
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 1570cbea4a49..4d9dbe0b7385 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -645,6 +645,25 @@ struct smb_version_operations smb21_operations = {
struct smb_version_values smb21_values = {
.version_string = SMB21_VERSION_STRING,
+ .protocol_id = SMB21_PROT_ID,
+ .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
+ .large_lock_type = 0,
+ .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
+ .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
+ .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
+ .header_size = sizeof(struct smb2_hdr),
+ .max_header_size = MAX_SMB2_HDR_SIZE,
+ .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
+ .lock_cmd = SMB2_LOCK,
+ .cap_unix = 0,
+ .cap_nt_find = SMB2_NT_FIND,
+ .cap_large_files = SMB2_LARGE_FILES,
+};
+
+struct smb_version_values smb30_values = {
+ .version_string = SMB30_VERSION_STRING,
+ .protocol_id = SMB30_PROT_ID,
+ .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
.large_lock_type = 0,
.exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
.shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 5ad88b4b9990..cf33622cdac8 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1,7 +1,7 @@
/*
* fs/cifs/smb2pdu.c
*
- * Copyright (C) International Business Machines Corp., 2009, 2011
+ * Copyright (C) International Business Machines Corp., 2009, 2012
* Etersoft, 2012
* Author(s): Steve French (sfrench@us.ibm.com)
* Pavel Shilovsky (pshilovsky@samba.org) 2012
@@ -304,24 +304,6 @@ free_rsp_buf(int resp_buftype, void *rsp)
cifs_buf_release(rsp);
}
-#define SMB2_NUM_PROT 2
-
-#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)}
-};
/*
*
@@ -348,7 +330,6 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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;
@@ -377,11 +358,10 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
req->hdr.SessionId = 0;
- for (i = 0; i < SMB2_NUM_PROT; i++)
- req->Dialects[i] = smb2protocols[i].name;
+ req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
- req->DialectCount = cpu_to_le16(i);
- inc_rfc1001_len(req, i * 2);
+ 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 ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
@@ -391,7 +371,7 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
req->SecurityMode = cpu_to_le16(temp);
- req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
+ req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
@@ -411,10 +391,14 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
cFYI(1, "mode 0x%x", rsp->SecurityMode);
- if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name)
+ /* 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))
+ cFYI(1, "negotiated smb2.0 dialect");
+ else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
cFYI(1, "negotiated smb2.1 dialect");
- else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name)
- cFYI(1, "negotiated smb2 dialect");
+ else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
+ cFYI(1, "negotiated smb3.0 dialect");
else {
cERROR(1, "Illegal dialect returned by server %d",
le16_to_cpu(rsp->DialectRevision));
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index da099225b1a9..4cb4ced258cb 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -163,9 +163,15 @@ struct smb2_negotiate_req {
__le32 Capabilities;
__u8 ClientGUID[SMB2_CLIENT_GUID_SIZE];
__le64 ClientStartTime; /* MBZ */
- __le16 Dialects[2]; /* variable length */
+ __le16 Dialects[1]; /* One dialect (vers=) at a time for now */
} __packed;
+/* Dialects */
+#define SMB20_PROT_ID 0x0202
+#define SMB21_PROT_ID 0x0210
+#define SMB30_PROT_ID 0x0300
+#define BAD_PROT_ID 0xFFFF
+
/* SecurityMode flags */
#define SMB2_NEGOTIATE_SIGNING_ENABLED 0x0001
#define SMB2_NEGOTIATE_SIGNING_REQUIRED 0x0002
@@ -173,6 +179,10 @@ struct smb2_negotiate_req {
#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 */
+#define SMB2_GLOBAL_CAP_MULTI_CHANNEL 0x00000008 /* New to SMB3 */
+#define SMB2_GLOBAL_CAP_PERSISTENT_HANDLES 0x00000010 /* New to SMB3 */
+#define SMB2_GLOBAL_CAP_DIRECTORY_LEASING 0x00000020 /* New to SMB3 */
+#define SMB2_GLOBAL_CAP_ENCRYPTION 0x00000040 /* New to SMB3 */
/* Internal types */
#define SMB2_NT_FIND 0x00100000
#define SMB2_LARGE_FILES 0x00200000