nixos/iwd: add settings option

nixos/doc/manual/from_md/release-notes/rl-2111.section.xml

@@ -688,6 +688,15 @@
           </listitem>
         </itemizedlist>
       </listitem>
+      <listitem>
+        <para>
+          The
+          <link xlink:href="options.html#opt-networking.wireless.iwd.enable">networking.wireless.iwd</link>
+          module has a new
+          <link xlink:href="options.html#opt-networking.wireless.iwd.settings">networking.wireless.iwd.settings</link>
+          option.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>

nixos/doc/manual/release-notes/rl-2111.section.md

@@ -179,3 +179,5 @@ pt-services.clipcat.enable).
   - NSS modules which should be queried after `resolved`, `files` and
     `myhostname`, but before `dns` should use the default priority
   - NSS modules which should come after `dns` should use mkAfter.
+
+- The [networking.wireless.iwd](options.html#opt-networking.wireless.iwd.enable) module has a new [networking.wireless.iwd.settings](options.html#opt-networking.wireless.iwd.settings) option.

nixos/modules/services/networking/iwd.nix

@@ -4,8 +4,31 @@ with lib;
 
 let
   cfg = config.networking.wireless.iwd;
+  ini = pkgs.formats.ini { };
+  configFile = ini.generate "main.conf" cfg.settings;
 in {
-  options.networking.wireless.iwd.enable = mkEnableOption "iwd";
+  options.networking.wireless.iwd = {
+    enable = mkEnableOption "iwd";
+
+    settings = mkOption {
+      type = ini.type;
+      default = { };
+
+      example = {
+        Settings.AutoConnect = true;
+
+        Network = {
+          EnableIPv6 = true;
+          RoutePriorityOffset = 300;
+        };
+      };
+
+      description = ''
+        Options passed to iwd.
+        See <link xlink:href="https://iwd.wiki.kernel.org/networkconfigurationsettings">here</link> for supported options.
+      '';
+    };
+  };
 
   config = mkIf cfg.enable {
     assertions = [{
@@ -15,6 +38,8 @@ in {
       '';
     }];
 
+    environment.etc."iwd/main.conf".source = configFile;
+
     # for iwctl
     environment.systemPackages =  [ pkgs.iwd ];
 
@@ -27,7 +52,10 @@ in {
       linkConfig.NamePolicy = "keep kernel";
     };
 
-    systemd.services.iwd.wantedBy = [ "multi-user.target" ];
+    systemd.services.iwd = {
+      wantedBy = [ "multi-user.target" ];
+      restartTriggers = [ configFile ];
+    };
   };
 
   meta.maintainers = with lib.maintainers; [ mic92 dtzWill ];