Make DTLS_HELLO_VERIFY a compile option
diff --git a/include/polarssl/config.h b/include/polarssl/config.h
index 731b90c..4988f39 100644
--- a/include/polarssl/config.h
+++ b/include/polarssl/config.h
@@ -924,6 +924,23 @@
#define POLARSSL_SSL_ALPN
/**
+ * \def POLARSSL_SSL_DTLS_HELLO_VERIFY
+ *
+ * Enable support for HelloVerifyRequest on DTLS servers.
+ *
+ * This feature is highly recommended to prevent DTLS servers being used as
+ * amplifiers in DoS attacks against other hosts. It should always be enabled
+ * unless you know for sure amplification cannot be a problem in the
+ * environment in which your server operates.
+ *
+ * Requires: POLARSSL_SSL_SRV_C
+ * POLARSSL_POLARSSL_PROTO_DTLS
+ *
+ * Comment this to disable support for HelloVerifyRequest.
+ */
+#define POLARSSL_SSL_DTLS_HELLO_VERIFY
+
+/**
* \def POLARSSL_SSL_SESSION_TICKETS
*
* Enable support for RFC 5077 session tickets in SSL.