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https://github.com/mirage/qubes-mirage-firewall.git
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33 lines
1.0 KiB
OCaml
33 lines
1.0 KiB
OCaml
(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
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See the README file for details. *)
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open Utils
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let src = Logs.Src.create "router" ~doc:"Router"
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module Log = (val Logs.src_log src : Logs.LOG)
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type t = {
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client_net : Client_net.t;
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default_gateway : interface;
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}
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let create ~client_net ~default_gateway = { client_net; default_gateway }
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let client_net t = t.client_net
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let target t buf =
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let open Wire_structs.Ipv4_wire in
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let dst_ip = get_ipv4_dst buf |> Ipaddr.V4.of_int32 in
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Log.debug "Got IPv4: dst=%s" (fun f -> f (Ipaddr.V4.to_string dst_ip));
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if Ipaddr.V4.Prefix.mem dst_ip (Client_net.prefix t.client_net) then (
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match Client_net.lookup t.client_net dst_ip with
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| Some client_link -> Some (client_link :> interface)
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| None ->
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Log.warn "Packet to unknown internal client %a - dropping"
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(fun f -> f Ipaddr.V4.pp_hum dst_ip);
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None
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) else Some t.default_gateway
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let add_client t = Client_net.add_client t.client_net
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let remove_client t = Client_net.remove_client t.client_net
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