l: add wirelum.nix

lass/2configs/default.nix

@@ -10,6 +10,7 @@ with import <stockholm/lib>;
     ./zsh.nix
     ./htop.nix
     ./security-workarounds.nix
+    ./wirelum.nix
     {
       users.extraUsers =
         mapAttrs (_: h: { hashedPassword = h; })

lass/2configs/wirelum.nix

@@ -0,0 +1,44 @@
+with import <stockholm/lib>;
+{ config, pkgs, ... }: let
+
+  self = config.krebs.build.host.nets.wirelum;
+  isRouter = !isNull self.via;
+
+in mkIf (hasAttr "wirelum" config.krebs.build.host.nets) {
+  #hack for modprobe inside containers
+  systemd.services."wireguard-wirelum".path = mkIf config.boot.isContainer (mkBefore [
+    (pkgs.writeDashBin "modprobe" ":")
+  ]);
+
+  boot.kernel.sysctl = mkIf isRouter {
+    "net.ipv6.conf.all.forwarding" = 1;
+  };
+  krebs.iptables.tables.filter.INPUT.rules = [
+     { predicate = "-p udp --dport ${toString self.wireguard.port}"; target = "ACCEPT"; }
+  ];
+  krebs.iptables.tables.filter.FORWARD.rules = mkIf isRouter [
+    { precedence = 1000; predicate = "-i wirelum -o wirelum"; target = "ACCEPT"; }
+  ];
+
+  networking.wireguard.interfaces.wirelum = {
+    ips =
+      (optional (!isNull self.ip4) self.ip4.addr) ++
+      (optional (!isNull self.ip6) self.ip6.addr);
+    listenPort = 51820;
+    privateKeyFile = (toString <secrets>) + "/wirelum.key";
+    allowedIPsAsRoutes = true;
+    peers = mapAttrsToList
+      (_: host: {
+        allowedIPs = if isRouter then
+          (optional (!isNull host.nets.wirelum.ip4) host.nets.wirelum.ip4.addr) ++
+          (optional (!isNull host.nets.wirelum.ip6) host.nets.wirelum.ip6.addr)
+        else
+          host.nets.wirelum.wireguard.subnets
+        ;
+        endpoint = mkIf (!isNull host.nets.wirelum.via) (host.nets.wirelum.via.ip4.addr + ":${toString host.nets.wirelum.wireguard.port}");
+        persistentKeepalive = mkIf (!isNull host.nets.wirelum.via) 61;
+        publicKey = host.nets.wirelum.wireguard.pubkey;
+      })
+      (filterAttrs (_: h: hasAttr "wirelum" h.nets) config.krebs.hosts);
+  };
+}