+/* ext_flags values */
+
+/* Indicates an extension has been received.
+ * Used to check for unsolicited or duplicate extensions.
+ */
+#define SSL_EXT_FLAG_RECEIVED 0x1
+/* Indicates an extension has been sent: used to
+ * enable sending of corresponding ServerHello extension.
+ */
+#define SSL_EXT_FLAG_SENT 0x2
+