iframe for multisite wordpress

add_action('wp_dashboard_setup', 'my_stats_dashboard_widgets');
function my_stats_dashboard_widgets() {
global $wp_meta_boxes;
wp_add_dashboard_widget('custom_stats_widget', 'Scorecard Funnel Statistics', 'custom_dashboard_stats');
}
function custom_dashboard_stats() {



            if(is_home() || is_front_page()){
                global $wp;
                $current_url = home_url(add_query_arg(array(),$wp->request));
                ?>
<iframe src="<?php echo $current_url;?>" width="100%" height="600" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
                <?php
            }
            else{
                $current_url = get_permalink();
                ?>
<iframe src="<?php echo $current_url;?>" width="100%" height="600" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
                <?php

            }

}