meta: Add options for networking module

Now it's possible to use the system without mullvad vpn.

flake.nix

@@ -57,11 +57,17 @@
             home-manager.sharedModules = builtins.attrValues self.homeManagerModules;
             environment.systemPackages = builtins.attrValues self.packages.x86_64-linux;
 
-            modules.hardware = {
+            modules = {
+              hardware = {
                 disableLaptopKeyboard = true;
                 lidIgnore = true;
                 powerIgnore = true;
               };
+
+              networking = {
+                mullvad = true;
+              };
+            };
           }
         ];
       };

modules/networking.nix

@@ -1,6 +1,27 @@
+{ config, lib, ... }:
+
+let
+  inherit (lib) mkEnableOption mkOption mkIf;
+  inherit (lib.types) string;
+
+  cfg = config.modules.networking;
+in
 {
+  options.modules.networking = {
+    mullvad = mkEnableOption "mullvad vpn";
+
+    hostName = mkOption {
+      type = string;
+      default = "nixos";
+    };
+
+    allowSRB2Port = mkEnableOption "port for srb2";
+    allowZolaPort = mkEnableOption "port for zola";
+  };
+
+  config = with cfg; {
     networking = {
-    hostName = "nixos";
+      inherit hostName;
 
       networkmanager = {
         enable = true;
@@ -12,20 +33,20 @@
 
       useHostResolvConf = true;
 
-    resolvconf.enable = false;
+      resolvconf.enable = mkIf mullvad false;
 
-    nat = {
+      nat = mkIf mullvad {
         enable = true;
         internalInterfaces = [ "ve-+" ];
         externalInterface = "wg-mullvad";
       };
 
       firewall = {
-      allowedUDPPorts = [
+        allowedUDPPorts = mkIf allowSRB2Port [
           5029
         ];
 
-      allowedTCPPorts = [
+        allowedTCPPorts = mkIf allowZolaPort [
           1111
         ];
       };
@@ -33,8 +54,9 @@
 
     services.resolved.llmnr = "false";
 
-  services.mullvad-vpn = {
+    services.mullvad-vpn = mkIf mullvad {
       enable = true;
       enableExcludeWrapper = false;
     };
+  };
 }