According to ietf-routing model, there are 4 special states for hop :

leaf special-next-hop {
type enumeration {
enum blackhole

{ description "Silently discard the packet."; }

enum unreachable

{ description "Discard the packet and notify the sender with an error message indicating that the destination host is unreachable."; }

enum prohibit

{ description "Discard the packet and notify the sender with an error message indicating that the communication is administratively prohibited."; }

enum receive

{ description "The packet will be received by the local network device."; }

}
description
"Special next-hop options.";
}

options blackhole(is_drop) and receive(is_local) are allready supported. unreachable should be possible to implement, in case of prohibit,it should be also implemented ,if possible