diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index ef8dae2..26af68b 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -187,4 +187,41 @@
 	__u8   Buffer[1];	/* variable length GSS security buffer */
 } __packed;
 
+struct smb2_sess_setup_req {
+	struct smb2_hdr hdr;
+	__le16 StructureSize; /* Must be 25 */
+	__u8   VcNumber;
+	__u8   SecurityMode;
+	__le32 Capabilities;
+	__le32 Channel;
+	__le16 SecurityBufferOffset;
+	__le16 SecurityBufferLength;
+	__le64 PreviousSessionId;
+	__u8   Buffer[1];	/* variable length GSS security buffer */
+} __packed;
+
+/* Currently defined SessionFlags */
+#define SMB2_SESSION_FLAG_IS_GUEST	0x0001
+#define SMB2_SESSION_FLAG_IS_NULL	0x0002
+struct smb2_sess_setup_rsp {
+	struct smb2_hdr hdr;
+	__le16 StructureSize; /* Must be 9 */
+	__le16 SessionFlags;
+	__le16 SecurityBufferOffset;
+	__le16 SecurityBufferLength;
+	__u8   Buffer[1];	/* variable length GSS security buffer */
+} __packed;
+
+struct smb2_logoff_req {
+	struct smb2_hdr hdr;
+	__le16 StructureSize;	/* Must be 4 */
+	__le16 Reserved;
+} __packed;
+
+struct smb2_logoff_rsp {
+	struct smb2_hdr hdr;
+	__le16 StructureSize;	/* Must be 4 */
+	__le16 Reserved;
+} __packed;
+
 #endif				/* _SMB2PDU_H */