refactor: static networking

modules/meta/access.nix

@@ -0,0 +1,32 @@
+{
+  config,
+  access,
+  ...
+}: let
+  nixosModule = {
+    config,
+    ...
+  }: {
+    config = {
+      _module.args.access = access // {
+        systemFor = hostName: if hostName == config.networking.hostName
+          then config
+          else access.systemFor hostName;
+        systemForOrNull = hostName: if hostName == config.networking.hostName
+          then config
+          else access.systemForOrNull hostName;
+      };
+    };
+  };
+in {
+  config = {
+    network.nixos.extraModules = [
+      nixosModule
+    ];
+
+    _module.args.access = {
+      systemFor = hostName: config.network.nodes.${hostName};
+      systemForOrNull = hostName: config.network.nodes.${hostName} or null;
+    };
+  };
+}

modules/nixos/access.nix

@@ -8,9 +8,6 @@
   inherit (config.networking) hostName;
 in {
   options.networking.access = with lib.types; {
-    static.ipv4 = mkOption {
-      type = str;
-    };
     hostnameForNetwork = mkOption {
       type = attrsOf str;
       default = { };

modules/nixos/network.nix

@@ -1,14 +1,53 @@
 {
   config,
   lib,
-  pkgs,
   ...
-}:
-with lib; {
+}: let
+  inherit (lib.options) mkOption mkEnableOption;
+  inherit (lib.modules) mkIf mkMerge mkOptionDefault;
+  inherit (lib.trivial) eui64;
+  inherit (config) networking services;
+  networkModule = { config, ... }: {
+    options = with lib.types; {
+      mdns = {
+        enable = mkEnableOption "SLAAC" // {
+          default = config.matchConfig.Type or null == "ether" && services.resolved.enable;
+        };
+      };
+      slaac = {
+        enable = mkEnableOption "SLAAC" // {
+          default = config.matchConfig.Type or null == "ether" && networking.enableIPv6;
+        };
+        postfix = mkOption {
+          type = str;
+        };
+      };
+    };
+    config = {
+      slaac.postfix = mkIf (config.matchConfig.MACAddress or null != null) (
+        mkOptionDefault (eui64 config.matchConfig.MACAddress)
+      );
+      networkConfig = mkMerge [
+        (mkIf config.slaac.enable {
+          IPv6AcceptRA = true;
+        })
+        (mkIf config.mdns.enable {
+          MulticastDNS = true;
+        })
+      ];
+      linkConfig = mkIf config.mdns.enable {
+        Multicast = true;
+      };
+    };
+  };
+in {
   options.deploy.system = mkOption {
-    type = types.unspecified;
+    type = lib.types.unspecified;
     readOnly = true;
   };
+  options.systemd.network.networks = mkOption {
+    type = with lib.types; attrsOf (submodule networkModule);
+  };
   config = {
     deploy.system = config.system.build.toplevel;
   };