Some extensions to netinet/in.h adding some Linux compatible defintions. From Macs N.

include/netinet/in.h

@@ -87,6 +87,11 @@
 #define MCAST_EXCLUDE         0
 #define MCAST_INCLUDE         1
 
+/* Test if an IPv4 address is a multicast address */
+
+#define IN_CLASSD(i)          (((uint32_t)(i) & 0xf0000000) == 0xe0000000)
+#define IN_MULTICAST(i)       IN_CLASSD(i)
+
 /* Special values of in_addr_t */
 
 #define INADDR_ANY            ((in_addr_t)0x00000000) /* Address to accept any incoming messages */
@@ -113,6 +118,8 @@
  * Public Type Definitions
  ****************************************************************************/
 
+typedef uint16_t in_port_t;
+
 /* IPv4 Internet address */
 
 typedef uint32_t in_addr_t;
@@ -148,8 +155,30 @@ struct sockaddr_in6
   struct in6_addr sin6_addr;   /* IPv6 internet address */
 };
 
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/* Global IPv6 in6addr_any */
+
+EXTERN const struct in6_addr in6addr_any;
+
 /****************************************************************************
  * Public Function Prototypes
  ****************************************************************************/
 
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
 #endif /* __INCLUDE_NETINET_IN_H */

libc/net/Make.defs

@@ -35,8 +35,8 @@
 
 # Add the networking C files to the build
 
-CSRCS += lib_etherntoa.c lib_htons.c lib_htonl.c lib_inetaddr.c
-CSRCS += lib_inetntoa.c lib_inetntop.c lib_inetpton.c
+CSRCS += lib_addrconfig.c lib_etherntoa.c lib_htons.c lib_htonl.c
+CSRCS += lib_inetaddr.c lib_inetntoa.c lib_inetntop.c lib_inetpton.c
 
 # Routing table support
 

libc/net/lib_addrconfig.c

@@ -0,0 +1,50 @@
+/****************************************************************************
+ * libc/net/lib_addrconf.c
+ * 
+ *   Author: Max Nekludov <macscomp@gmail.com>
+ *   Copyright (c) 2015, Max Nekludov. 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. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/net/ip.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;