Work on task #14587: Create common header for IANA assigned numbers

Create include/lwip/prot/iana.h
Move DHCP and ARP #define in there

src/include/lwip/prot/dhcp.h

@@ -128,9 +128,6 @@ typedef enum {
 #define DHCP_RELEASE                7
 #define DHCP_INFORM                 8
 
-/** DHCP hardware type, currently only ethernet is supported */
-#define DHCP_HTYPE_ETH              1
-
 #define DHCP_MAGIC_COOKIE           0x63825363UL
 
 /* This is a list of options for BOOTP and DHCP, see RFC 2132 for descriptions */

src/include/lwip/prot/etharp.h

@@ -101,12 +101,6 @@ PACK_STRUCT_END
 
 #define SIZEOF_ETHARP_HDR 28
 
-/* ARP hwtype values */
-enum etharp_hwtype {
-  HWTYPE_ETHERNET = 1
-  /* others not used */
-};
-
 /* ARP message types (opcodes) */
 enum etharp_opcode {
   ARP_REQUEST = 1,

src/include/lwip/prot/iana.h

@@ -0,0 +1,51 @@
+/**
+ * @file
+ * IANA assigned numbers
+ */
+
+/*
+ * Copyright (c) 2017 Dirk Ziegelmeier.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Dirk Ziegelmeier <dziegel@gmx.de>
+ *
+ */
+
+#ifndef LWIP_HDR_PROT_IANA_H
+#define LWIP_HDR_PROT_IANA_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define IANA_HWTYPE_ETHERNET  1
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_PROT_IANA_H */