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

@@ -20,10 +20,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright 1996-2003 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
+ * Copyright (c) 2016, Chris Fraire <cfraire@me.com>.
  */
 
 /*
  * dhcp.h - Generic DHCP definitions, as per RFC's 2131 and 2132.
  */

@@ -155,12 +156,19 @@
 
 /* Newer options */
 
 #define CD_SLPDA                78
 #define CD_SLPSS                79
+#define CD_CLIENTFQDN   81
 #define CD_AGENTOPT             82
+
+/*
+ * Per RFC 3679, option 89 was "Never published as standard and [is] not in
+ * general use". See active CD_CLIENTFQDN and RFC 4702.
+ */
 #define CD_FQDN                 89
+
 #define CD_PXEARCHi             93
 #define CD_PXENIIi              94
 #define CD_PXECID               95
 #define CD_MULTICST             107