How can I pass properties of parent component to a child component without explicitly naming them?

Let's assume there is a parent component A, which has a child component B, which in turn has a sub child C.

// Template A 


// Template B

Template C will list all the params sent to it. There is no fixed length or name for the params.

My objective is (from B) is to receive params from A and send all of them into C. How could I obtain the list of params and send them to child with binding intact with A ?