mirror of
https://github.com/mirage/qubes-mirage-firewall.git
synced 2024-10-01 01:05:39 -04:00
72 lines
2.3 KiB
OCaml
72 lines
2.3 KiB
OCaml
(* Copyright (C) 2015, Thomas Leonard <thomas.leonard@unikernel.com>
|
|
See the README file for details. *)
|
|
|
|
open Lwt.Infix
|
|
open Fw_utils
|
|
|
|
module Eth = Ethernet.Make(Netif)
|
|
|
|
let src = Logs.Src.create "uplink" ~doc:"Network connection to NetVM"
|
|
module Log = (val Logs.src_log src : Logs.LOG)
|
|
|
|
module Make(Clock : Mirage_clock_lwt.MCLOCK) = struct
|
|
module Arp = Arp.Make(Eth)(OS.Time)
|
|
|
|
type t = {
|
|
net : Netif.t;
|
|
eth : Eth.t;
|
|
arp : Arp.t;
|
|
interface : interface;
|
|
}
|
|
|
|
class netvm_iface eth mac ~my_ip ~other_ip : interface = object
|
|
val queue = FrameQ.create (Ipaddr.V4.to_string other_ip)
|
|
method my_mac = Eth.mac eth
|
|
method my_ip = my_ip
|
|
method other_ip = other_ip
|
|
method writev ethertype fillfn =
|
|
FrameQ.send queue (fun () ->
|
|
mac >>= fun dst ->
|
|
Eth.write eth dst ethertype fillfn >|= or_raise "Write to uplink" Eth.pp_error
|
|
)
|
|
end
|
|
|
|
let listen t router =
|
|
Netif.listen t.net ~header_size:Ethernet_wire.sizeof_ethernet (fun frame ->
|
|
(* Handle one Ethernet frame from NetVM *)
|
|
Eth.input t.eth
|
|
~arpv4:(Arp.input t.arp)
|
|
~ipv4:(fun ip ->
|
|
match Nat_packet.of_ipv4_packet ip with
|
|
| exception ex ->
|
|
Log.err (fun f -> f "Error unmarshalling ethernet frame from uplink: %s@.%a" (Printexc.to_string ex)
|
|
Cstruct.hexdump_pp frame
|
|
);
|
|
Lwt.return_unit
|
|
| Error e ->
|
|
Log.warn (fun f -> f "Ignored unknown IPv4 message from uplink: %a" Nat_packet.pp_error e);
|
|
Lwt.return ()
|
|
| Ok packet ->
|
|
Firewall.ipv4_from_netvm router packet
|
|
)
|
|
~ipv6:(fun _ip -> return ())
|
|
frame
|
|
) >|= or_raise "Uplink listen loop" Netif.pp_error
|
|
|
|
let interface t = t.interface
|
|
|
|
let connect ~clock:_ config =
|
|
let ip = config.Dao.uplink_our_ip in
|
|
Netif.connect "0" >>= fun net ->
|
|
Eth.connect net >>= fun eth ->
|
|
Arp.connect eth >>= fun arp ->
|
|
Arp.add_ip arp ip >>= fun () ->
|
|
let netvm_mac =
|
|
Arp.query arp config.Dao.uplink_netvm_ip
|
|
>|= or_raise "Getting MAC of our NetVM" Arp.pp_error in
|
|
let interface = new netvm_iface eth netvm_mac
|
|
~my_ip:ip
|
|
~other_ip:config.Dao.uplink_netvm_ip in
|
|
return { net; eth; arp; interface }
|
|
end
|