qubes-mirage-firewall/fw_utils.ml

49 lines
1.2 KiB
OCaml

(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
See the README file for details. *)
(** General utility functions. *)
module IpMap = struct
include Map.Make(Ipaddr.V4)
let find x map =
try Some (find x map)
with Not_found -> None
end
module Int = struct
type t = int
let compare (a:t) (b:t) = compare a b
end
module IntSet = Set.Make(Int)
module IntMap = Map.Make(Int)
(** An Ethernet interface. *)
class type interface = object
method my_mac : Macaddr.t
method writev : Mirage_protocols.Ethernet.proto -> (Cstruct.t -> int) -> unit Lwt.t
method my_ip : Ipaddr.V4.t
method other_ip : Ipaddr.V4.t
end
(** An Ethernet interface connected to a clientVM. *)
class type client_link = object
inherit interface
method other_mac : Macaddr.t
end
(** An Ethernet header from [src]'s MAC address to [dst]'s with an IPv4 payload. *)
let eth_header ethertype ~src ~dst =
Ethernet_packet.Marshal.make_cstruct { Ethernet_packet.source = src; destination = dst; ethertype }
let error fmt =
let err s = Failure s in
Printf.ksprintf err fmt
let return = Lwt.return
let fail = Lwt.fail
let or_raise msg pp = function
| Ok x -> x
| Error e -> failwith (Fmt.strf "%s: %a" msg pp e)