net: Add utility function returning IPv4 broadcast address

Change-Id: Ibe4f5ad530f6a0f50137ef2cd8e64dbc9de6cba1
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

include/net/yaip/net_if.h

@@ -306,6 +306,12 @@ struct in6_addr *net_if_ipv6_select_src_addr(struct net_if *iface,
  */
 struct in6_addr *net_if_ipv6_unspecified_addr(void);
 
+/**
+ * @brief Return IPv4 broadcast address (all bits ones)
+ * @return IPv4 broadcast address with all bits set to one.
+ */
+const struct in_addr *net_if_ipv4_broadcast_addr(void);
+
 /**
  * @brief Get a IPv6 link local address in a given state.
  * @param iface Interface to use. Must be a valid pointer to an interface.

include/net/yaip/net_ip.h

@@ -329,6 +329,17 @@ static inline struct in6_addr *net_ipv6_unspecified_address(void)
 	return net_if_ipv6_unspecified_addr();
 }
 
+extern const struct in_addr *net_if_ipv4_broadcast_addr(void);
+
+/** @brief Return pointer to broadcast (all bits ones) IPv4 address.
+ *
+ * @return Broadcast IPv4 address.
+ */
+static inline const struct in_addr *net_ipv4_broadcast_address(void)
+{
+	return net_if_ipv4_broadcast_addr();
+}
+
 #ifdef __cplusplus
 }
 #endif

net/yaip/net_if.c

@@ -216,6 +216,17 @@ struct in6_addr *net_if_ipv6_unspecified_addr(void)
 #endif
 }
 
+const struct in_addr *net_if_ipv4_broadcast_addr(void)
+{
+#if defined(CONFIG_NET_IPV4)
+	static const struct in_addr addr = { { { 255, 255, 255, 255 } } };
+
+	return &addr;
+#else
+	return NULL;
+#endif
+}
+
 struct in6_addr *net_if_ipv6_get_ll(struct net_if *iface,
 				    enum net_addr_state addr_state)
 {