The other part of dotfiles

modules/networking/avahi.nix

@@ -0,0 +1,18 @@
+{ lib, config, pkgs, ... }:
+let
+  cfg = config.avahi;
+in
+{
+  options.avahi = {
+    enable = lib.mkEnableOption "Enable Avahi and apply customization module";
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.avahi = {
+      enable = true;
+      nssmdns = true;
+      openFirewall = true;
+    };
+  };
+
+}

modules/networking/default.nix

@@ -0,0 +1,6 @@
+{
+  imports = [
+    ./avahi.nix
+    ./tailscale.nix
+  ];
+}

modules/networking/tailscale.nix

@@ -0,0 +1,39 @@
+{ lib, config, pkgs, ... }:
+let
+  cfg = config.tailscale;
+in
+{
+  options.tailscale = {
+    enable = lib.mkEnableOption "Enable Tailscale module";
+
+    authKeyFile = lib.mkOption {
+      default = "";
+      type = config.services.tailscale.authKeyFile.type;
+      description = config.services.tailscale.authKeyFile.description;
+    };
+
+    exitNode = lib.mkOption {
+      default = "";
+      description = ''
+        The tailscale IP of the optional exit node.
+      '';
+    };
+
+    extraUpFlags = lib.mkOption {
+      default = "";
+      type = config.services.tailscale.extraUpFlags.type;
+      description = config.services.tailscale.extraUpFlags.description;
+    };
+
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.tailscale = {
+      enable = true;
+      authKeyFile = cfg.authKeyFile;
+      useRoutingFeatures = if cfg.exitNode == "" then "none" else "both";
+      extraUpFlags = [ "--exit-node=${cfg.exitNode}" ] ++ cfg.extraUpFlags;
+    };
+  };
+
+}