sys/net/sock: add sock_udp_ep_is_v6()

sys/include/net/sock/udp.h

@@ -822,6 +822,26 @@ static inline bool sock_udp_ep_is_multicast(const sock_udp_ep_t *ep)
     return false;
 }
 
+/**
+ * @brief   Checks if the IP address of an endpoint is an IPv6 address
+ *
+ * @param[in] ep end point to check
+ *
+ * @returns true if end point is IPv6
+ */
+static inline bool sock_udp_ep_is_v6(const sock_udp_ep_t *ep)
+{
+#if !defined(SOCK_HAS_IPV6)
+    (void)ep;
+    return false;
+#elif !defined(SOCK_HAS_IPV4)
+    (void)ep;
+    return true;
+#else
+    return ep->family == AF_INET6;
+#endif
+}
+
 #include "sock_types.h"
 
 #ifdef __cplusplus