pkgs/openwrt: install vxlan if needed

nix/pkgs/openwrt/default.nix

@@ -43,10 +43,18 @@ in rec {
 
   buildImage = hostName:
     let
-      inherit (config.site.hosts.${hostName}) model;
+      hostConfig = config.site.hosts.${hostName};
+
+      hasVxlan = builtins.any ({ type, ... }:
+        type == "vxlan"
+      ) (builtins.attrValues hostConfig.interfaces);
+
+      inherit (hostConfig) model;
+
       matches = (openwrt-imagebuilder.lib.profiles {
         inherit pkgs;
       }).identifyProfiles model;
+
       fallbackProfile =
         if model == "dir-615-d"
         then (openwrt-imagebuilder.lib.profiles {
@@ -67,6 +75,7 @@ in rec {
           };
         }
         else null;
+
       build = args:
         openwrt-imagebuilder.lib.build (args // {
           extraImageName = "zw-${hostName}";
@@ -84,6 +93,8 @@ in rec {
             # wpa3
             "-wpad-basic-wolfssl" "-wpad-mini"
             "wpad-openssl"
+          ] ++ nixpkgs.lib.optionals hasVxlan [
+            "vxlan" "kmod-vxlan"
           ] ++ modelPackages.${model} or [];
           disabledServices = [ "dnsmasq" "uhttpd" ];
           files = pkgs.runCommandNoCC "image-files" {} ''
@@ -93,14 +104,18 @@ in rec {
             EOF
           '';
         });
+
     in
       if matches == [] && fallbackProfile != null
       then build fallbackProfile
+
       else if matches == []
       then builtins.trace "${hostName} (${model}) not supported by OpenWRT"
         null
+
       else if builtins.length matches == 1
       then build (builtins.elemAt matches 0)
+
       else builtins.trace "${hostName} (${model}) has multiple models!" (
         build (builtins.elemAt matches 0)
       );