From 352d9aab099ea7367066c290df45e45e59932b00 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sun, 10 Oct 2021 13:15:33 +0200
Subject: yggdrasil-wg: udp2raw

---
 modules/yggdrasil-wg/default.nix | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/modules/yggdrasil-wg/default.nix b/modules/yggdrasil-wg/default.nix
index d73c7f3f..9ecbe663 100644
--- a/modules/yggdrasil-wg/default.nix
+++ b/modules/yggdrasil-wg/default.nix
@@ -4,6 +4,7 @@ with lib;
 
 let
   listenPort = 51820;
+  udp2rawPort = 51821;
   subnet = "2a03:4000:52:ada:1";
   subnetLength = 80;
   hostLength = subnetLength + 16;
@@ -47,13 +48,13 @@ let
   hostLinks = filter ({ from, to, ... }: from == hostName || to == hostName) links;
   hostRoutes = filter ({ from, to, ... }: from == hostName || to == hostName) routes;
   isRouter = inNetwork && any ({via, ...}: via == hostName) routes;
-  linkToPeer = opts@{from, to, ...}:
+  linkToPeer = ix: opts@{from, to, ...}:
     let
       other = if from == hostName then to else from;
     in {
       allowedIPs = hostIPs.${other} ++ concatMap (rArgs: if rArgs.from != hostName || rArgs.via != to then [] else hostIPs.${rArgs.to}) routes;
       publicKey = trim (readFile (mkPublicKeyPath other));
-    } // (optionalAttrs (from == hostName) (filterAttrs (n: _v: !(elem n ["from" "to" "endpointHost"])) opts // optionalAttrs (opts ? "endpointHost") { endpoint = "${opts.endpointHost}:${toString listenPort}"; }));
+    } // (optionalAttrs (from == hostName) (filterAttrs (n: _v: !(elem n ["from" "to" "endpointHost"])) opts // optionalAttrs (opts ? "endpointHost") { endpoint = "localhost:${toString (udp2rawPort + ix)}"; }));
 
   trim = str: if hasSuffix "\n" str then trim (removeSuffix "\n" str) else str;
   stripSubnet = addr: let matchRes = builtins.match "^(.*)/[0-9]+$" addr; in if matchRes == null then addr else elemAt matchRes 0;
@@ -73,7 +74,7 @@ in {
         allowedIPsAsRoutes = false;
         inherit listenPort;
         ips = hostIPs.${hostName};
-        peers = map linkToPeer hostLinks;
+        peers = imap0 linkToPeer hostLinks;
         privateKeyFile = config.sops.secrets."yggdrasil-wg.priv".path;
         postSetup = ''
           ${concatMapStringsSep "\n" (linkArgs: let other = if linkArgs.from == hostName then linkArgs.to else linkArgs.from; in concatMapStringsSep "\n" (otherIP: "ip route replace \"${otherIP}\" dev \"yggdrasil\" table \"main\"") hostIPs.${other}) hostLinks}
@@ -82,6 +83,16 @@ in {
       };
     };
 
+    systemd.services = listToAttrs (filter ({ value, ...}: value != null) (imap0 (ix: opts@{to, from, ...}: let other = if from == hostName then to else from; in nameValuePair "yggdrasil-udp2raw@${other}" (if opts ? "endpointHost" then {
+      requiredBy = ["wireguard-yggdrasil.service"];
+      
+      serviceConfig = {
+        ExecStart = "${pkgs.udp2raw}/bin/udp2raw ${if from == hostName then "-c -l localhost:${toString (udp2rawPort + ix)} -r ${opts.endpointHost}:${toString (udp2rawPort + ix)}" else "-s -l 0.0.0.0:${toString (udp2rawPort + ix)} -r localhost:${toString listenPort}"} -k tmpkey --auth-mode hmac_sha1 --raw-mode faketcp -a";
+      };
+    } else null)) hostLinks)) // {
+      firewall.path = optionals isRouter [pkgs.procps];
+    };
+
     sops.secrets = mkIf (pathExists privateKeyPath) {
       "yggdrasil-wg.priv" = {
         format = "binary";
@@ -91,7 +102,6 @@ in {
 
     networking.hosts = mkIf inNetwork (listToAttrs (concatMap ({name, value}: map (ip: nameValuePair (stripSubnet ip) ["${name}.yggdrasil"]) value) (mapAttrsToList nameValuePair hostIPs)));
 
-    systemd.services.firewall.path = optionals isRouter [pkgs.procps];
     networking.firewall = mkIf isRouter {
       extraCommands = ''
         ip6tables -A FORWARD -i yggdrasil -o yggdrasil -j nixos-fw-accept
-- 
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