(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
   See the README file for details. *)

(* Abstract over NAT interface (todo: remove this) *)

type t

type action = [
  | `NAT
  | `Redirect of Mirage_nat.endpoint
]

val free_udp_port : t -> src:Ipaddr.V4.t -> dst:Ipaddr.V4.t -> dst_port:int ->
  int * (unit -> unit)
val dns_port : t -> int -> bool
val create : max_entries:int -> t
val remove_connections : t -> Ipaddr.V4.t -> unit
val translate : t -> Nat_packet.t -> Nat_packet.t option
val add_nat_rule_and_translate : t ->
  xl_host:Ipaddr.V4.t -> action -> Nat_packet.t -> (Nat_packet.t, string) result