rem: status_t process_output(net_layer *me, net_buffer *buffer)
add: static status_t process_output(net_layer *me, net_buffer *buffer)
context: status_t process_output(net_layer *me, net_buffer *buffer){	if (!buffer)		return B_ERROR;		// Here the magical loopback effect ;-)	return g_stack->send_up(me, buffer);}