nixos-module/container/wireguard: make upBandwidth optional

config/net/flpk.nix

@@ -0,0 +1,23 @@
+{
+  site.hosts = {
+    flpk-gw = {
+      interfaces = {
+        core = {
+          hwaddr = "0A:14:48:b7:e4:91";
+          type = "veth";
+        };
+        up-flpk = {
+          type = "wireguard";
+          upstream = {
+            provider = "flpk";
+          };
+        };
+      };
+      ospf = {
+        allowedUpstreams = [ "upstream3" "upstream4" "freifunk" ];
+        # upstreamInstance = TODO;
+      };
+      role = "container";
+    };
+  };
+}

nix/nixos-module/container/wireguard.nix

@@ -88,7 +88,7 @@ in
       routeConfig.Destination = "::/0";
     } ];
 
-    extraConfig = ''
+    extraConfig = lib.mkIf (upstream.upBandwidth != null) ''
       [CAKE]
       Parent = root
       # DOCSIS overhead