SO_USER_COOKIE
rc = wg_socket_set_sockopt(so4, so6, SO_USER_COOKIE, &sc->sc_socket.so_user_cookie, sizeof(sc->sc_socket.so_user_cookie));
ret = wg_socket_set_sockopt(so->so_so4, so->so_so6, SO_USER_COOKIE, &user_cookie, sizeof(user_cookie));
case SO_USER_COOKIE:
ret = setsockopt(sock, SOL_SOCKET, SO_USER_COOKIE, &cookie, sizeof(cookie));
ret = setsockopt(accepted, SOL_SOCKET, SO_USER_COOKIE,