CIFS: Add capability to send SMB2 negotiate message

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@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index b08a277df896..ef8dae213f60 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -148,4 +148,43 @@ 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 */
+} __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;
+        __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 */