+void flush_meta(struct meshlink_handle *mesh, struct connection_t *);
+void send_udppacket(struct meshlink_handle *mesh, struct node_t *, struct vpn_packet_t *);
+void choose_udp_address(struct meshlink_handle *mesh, const struct node_t *n, const union sockaddr_t **sa, int *sock, union sockaddr_t *sa_buf);