ndppd module: init (NixOS#35533)

nixos/modules/module-list.nix

@@ -515,6 +515,7 @@
   ./services/networking/murmur.nix
   ./services/networking/namecoind.nix
   ./services/networking/nat.nix
+  ./services/networking/ndppd.nix
   ./services/networking/networkmanager.nix
   ./services/networking/nftables.nix
   ./services/networking/ngircd.nix

nixos/modules/services/networking/ndppd.nix

@@ -0,0 +1,47 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.ndppd;
+
+  configFile = pkgs.runCommand "ndppd.conf" {} ''
+    substitute ${pkgs.ndppd}/etc/ndppd.conf $out \
+      --replace eth0 ${cfg.interface} \
+      --replace 1111:: ${cfg.network}
+  '';
+in {
+  options = {
+    services.ndppd = {
+      enable = mkEnableOption "daemon that proxies NDP (Neighbor Discovery Protocol) messages between interfaces";
+      interface = mkOption {
+        type = types.string;
+        default = "eth0";
+        example = "ens3";
+        description = "Interface which is on link-level with router.";
+      };
+      network = mkOption {
+        type = types.string;
+        default = "1111::";
+        example = "2001:DB8::/32";
+        description = "Network that we proxy.";
+      };
+      configFile = mkOption {
+        type = types.nullOr types.path;
+        default = null;
+        description = "Path to configuration file.";
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.packages = [ pkgs.ndppd ];
+    environment.etc."ndppd.conf".source = if (cfg.configFile != null) then cfg.configFile else configFile;
+    systemd.services.ndppd = {
+      serviceConfig.RuntimeDirectory = [ "ndppd" ];
+      wantedBy = [ "multi-user.target" ];
+    };
+  };
+
+  meta.maintainers = with maintainers; [ gnidorah ];
+}

pkgs/applications/networking/ndppd/default.nix

@@ -1,6 +1,11 @@
-{ stdenv, fetchFromGitHub, gzip, ... }:
+{ stdenv, fetchFromGitHub, fetchurl, gzip, ... }:
 
-stdenv.mkDerivation rec {
+let
+  serviceFile = fetchurl {
+    url = "https://raw.githubusercontent.com/DanielAdolfsson/ndppd/f37e8eb33dc68b3385ecba9b36a5efd92755580f/ndppd.service";
+    sha256 = "1zf54pzjfj9j9gr48075njqrgad4myd3dqmhvzxmjy4gjy9ixmyh";
+  };
+in stdenv.mkDerivation rec {
   name = "ndppd-${version}";
   version = "0.2.5";
 
@@ -19,6 +24,16 @@ stdenv.mkDerivation rec {
     substituteInPlace Makefile --replace /bin/gzip ${gzip}/bin/gzip
   '';
 
+  postInstall = ''
+    mkdir -p $out/etc
+    cp ndppd.conf-dist $out/etc/ndppd.conf
+
+    mkdir -p $out/lib/systemd/system
+    # service file needed for our module is not in release yet
+    substitute ${serviceFile} $out/lib/systemd/system/ndppd.service \
+      --replace /usr/sbin/ndppd $out/sbin/ndppd
+  '';
+
   meta = {
     description = "A daemon that proxies NDP (Neighbor Discovery Protocol) messages between interfaces";
     homepage = https://github.com/DanielAdolfsson/ndppd;