7388 Support DHCP Client FQDN. Allow IAID/DUID for all v4.

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
+ * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
  */
 
 #ifndef _DHCP_IMPL_H
 #define _DHCP_IMPL_H
 

@@ -92,10 +93,15 @@
         uint8_t    code;
         uint8_t    len;
         uint8_t    value[1];
 } DHCP_OPT;
 
+/*
+ * Defines the size of DHCP_OPT code + len
+ */
+#define DHCP_OPT_META_LEN       2
+
 typedef union sockaddr46_s {
         struct sockaddr_in v4;
         struct sockaddr_in6 v6;
 } sockaddr46_t;