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

*** 19,28 ****
--- 19,29 ----
   * 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
  
*** 92,101 ****
--- 93,107 ----
          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;