Split this network/this host on this network up in to, per RFC 6890 errata

Author: derickr

ext/filter/logical_filters.c

@@ -869,14 +869,18 @@ static int _php_filter_validate_ipv6(const char *str, size_t str_len, int ip[8])
 }
 /* }}} */
 
-/* From the tables in RFC 6890 - Special-Purpose IP Address Registries */
+/* From the tables in RFC 6890 - Special-Purpose IP Address Registriesi
+ * Including errata: https://www.rfc-editor.org/errata_search.php?rfc=6890&rec_status=1 */
 static bool ipv4_get_status_flags(int ip[8], bool *global, bool *reserved, bool *private)
 {
 	*global = false;
 	*reserved = false;
 	*private = false;
 
 	if (ip[0] == 0) {
+		/* RFC 0791 - This network */
+		*reserved = true;
+	} else if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0) {
 		/* RFC 1122 - This host on this network */
 		*reserved = true;
 	} else if (ip[0] == 10) {