tailscale

.github/workflows/nixos-build.yml

@@ -1,5 +1,4 @@
 name: NixOS build
-
 on:
   pull_request:
     branches:
@@ -17,14 +16,11 @@ on:
       - ".sops.yaml"
       - "secrets/**"
   workflow_dispatch:
-
 permissions:
   contents: read
-
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
-
 jobs:
   discover-hosts:
     name: Discover NixOS hosts
@@ -34,7 +30,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -42,7 +37,6 @@ jobs:
             experimental-features = nix-command flakes
             accept-flake-config = true
             access-tokens = github.com=${{ github.token }}
-
       - name: Evaluate NixOS hosts
         id: hosts
         run: |
@@ -50,7 +44,6 @@ jobs:
           hosts_json=$(nix eval --json '.#nixosConfigurations' --apply 'configs: builtins.attrNames configs')
           echo "hosts=${hosts_json}" >> "$GITHUB_OUTPUT"
           echo "Discovered hosts: ${hosts_json}"
-
   build-host:
     name: Build ${{ matrix.host }}
     needs: discover-hosts
@@ -63,7 +56,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -71,7 +63,6 @@ jobs:
             experimental-features = nix-command flakes
             accept-flake-config = true
             access-tokens = github.com=${{ github.token }}
-
       - name: Build NixOS system
         run: |
           set -euo pipefail

.github/workflows/nixos-eval.yml

@@ -1,5 +1,4 @@
 name: NixOS eval
-
 on:
   pull_request:
     branches:
@@ -17,14 +16,11 @@ on:
       - ".sops.yaml"
       - "secrets/**"
   workflow_dispatch:
-
 permissions:
   contents: read
-
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
-
 jobs:
   discover-hosts:
     name: Discover NixOS hosts
@@ -34,7 +30,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -42,7 +37,6 @@ jobs:
             experimental-features = nix-command flakes
             accept-flake-config = true
             access-tokens = github.com=${{ github.token }}
-
       - name: Evaluate NixOS hosts
         id: hosts
         run: |
@@ -50,7 +44,6 @@ jobs:
           hosts_json=$(nix eval --json '.#nixosConfigurations' --apply 'configs: builtins.attrNames configs')
           echo "hosts=${hosts_json}" >> "$GITHUB_OUTPUT"
           echo "Discovered hosts: ${hosts_json}"
-
   eval-host:
     name: Eval ${{ matrix.host }}
     needs: discover-hosts
@@ -63,7 +56,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-
       - name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
@@ -71,7 +63,6 @@ jobs:
             experimental-features = nix-command flakes
             accept-flake-config = true
             access-tokens = github.com=${{ github.token }}
-
       - name: Evaluate NixOS system derivation
         run: |
           set -euo pipefail

hosts/default.nix

@@ -69,6 +69,7 @@ in
         "workloads/dev"
         "workloads/personal"
         "workloads/secure-storage"
+        "workloads/tailscale/client"
       ];
     };
 

modules/applications/tailscale.nix

@@ -1,38 +1,118 @@
 { lib, config, ... }:
+
 let
   cfg = config.my.applications.tailscale;
+
+  hasAdvertiseRoutes = cfg.advertiseRoutes != [ ];
+
+  computedRoutingFeatures =
+    if cfg.routingFeatures != "auto" then
+      cfg.routingFeatures
+    else if hasAdvertiseRoutes && cfg.acceptRoutes then
+      "both"
+    else if hasAdvertiseRoutes then
+      "server"
+    else if cfg.acceptRoutes then
+      "client"
+    else
+      "none";
+
+  computedOpenFirewall = if cfg.openFirewall != null then cfg.openFirewall else hasAdvertiseRoutes;
+
+  computedSetFlags = [
+    "--accept-dns=${lib.boolToString cfg.acceptDns}"
+    "--accept-routes=${lib.boolToString cfg.acceptRoutes}"
+  ]
+  ++ lib.optionals hasAdvertiseRoutes [
+    "--advertise-routes=${lib.concatStringsSep "," cfg.advertiseRoutes}"
+  ]
+  ++ cfg.extraSetFlags;
 in
 {
   options.my.applications.tailscale = {
-    enable = lib.mkEnableOption "Tailscale VPN";
+    enable = lib.mkEnableOption "Tailscale";
 
     acceptDns = lib.mkOption {
       type = lib.types.bool;
       default = false;
-      description = "Accept DNS configuration from Tailscale";
+      description = "Accept DNS configuration from Tailscale.";
     };
 
     acceptRoutes = lib.mkOption {
       type = lib.types.bool;
-      default = true;
-      description = "Accept subnet routes from Tailscale";
+      default = false;
+      description = "Accept subnet routes advertised by other Tailscale nodes.";
+    };
+
+    advertiseRoutes = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      example = [ "10.50.0.0/16" ];
+      description = "Subnet routes to advertise through this Tailscale node.";
+    };
+
+    routingFeatures = lib.mkOption {
+      type = lib.types.enum [
+        "auto"
+        "none"
+        "client"
+        "server"
+        "both"
+      ];
+      default = "auto";
+      description = ''
+        Routing feature mode for Tailscale.
+
+        auto:
+          - advertiseRoutes only -> server
+          - acceptRoutes only -> client
+          - both -> both
+          - neither -> none
+      '';
+    };
+
+    openFirewall = lib.mkOption {
+      type = lib.types.nullOr lib.types.bool;
+      default = null;
+      description = ''
+        Whether to open the firewall for Tailscale's UDP port.
+
+        null means automatic:
+          - true when advertiseRoutes is non-empty
+          - false otherwise
+      '';
+    };
+
+    extraSetFlags = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      description = "Additional flags to pass to `tailscale set`.";
     };
 
     extraUpFlags = lib.mkOption {
       type = lib.types.listOf lib.types.str;
       default = [ ];
-      description = "Additional flags to pass to tailscale up";
+      description = ''
+        Additional flags to pass to `tailscale up`.
+
+        Note: on current NixOS this is only applied by the built-in
+        autoconnect service when services.tailscale.authKeyFile is set.
+      '';
     };
   };
 
   config = lib.mkIf cfg.enable {
     services.tailscale = {
       enable = true;
-      extraUpFlags = [
-        "--accept-dns=${if cfg.acceptDns then "true" else "false"}"
-      ]
-      ++ lib.optional cfg.acceptRoutes "--accept-routes"
-      ++ cfg.extraUpFlags;
+
+      openFirewall = computedOpenFirewall;
+      useRoutingFeatures = computedRoutingFeatures;
+
+      # 常時反映したい設定は tailscale set に寄せる
+      extraSetFlags = computedSetFlags;
+
+      # authKeyFile を使う場合だけ効くものとして残す
+      inherit (cfg) extraUpFlags;
     };
   };
 }

modules/features/network/tailscale.nix

@@ -1,31 +1,75 @@
 { lib, config, ... }:
+
 let
   cfg = config.my.features.network.tailscale;
 in
 {
   options.my.features.network.tailscale = {
     enable = lib.mkEnableOption "Tailscale VPN";
+
     acceptDns = lib.mkOption {
       type = lib.types.bool;
       default = false;
-      description = "Accept DNS configuration from Tailscale";
+      description = "Accept DNS configuration from Tailscale.";
     };
+
     acceptRoutes = lib.mkOption {
       type = lib.types.bool;
-      default = true;
-      description = "Accept subnet routes from Tailscale";
+      default = false;
+      description = "Accept subnet routes from Tailscale.";
     };
+
+    advertiseRoutes = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      example = [ "10.50.0.0/16" ];
+      description = "Subnet routes to advertise through this machine.";
+    };
+
+    routingFeatures = lib.mkOption {
+      type = lib.types.enum [
+        "auto"
+        "none"
+        "client"
+        "server"
+        "both"
+      ];
+      default = "auto";
+      description = "Override Tailscale routing features. Usually leave this as auto.";
+    };
+
+    openFirewall = lib.mkOption {
+      type = lib.types.nullOr lib.types.bool;
+      default = null;
+      description = "Override Tailscale firewall opening. Usually leave this as null.";
+    };
+
+    extraSetFlags = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      description = "Additional flags to pass to `tailscale set`.";
+    };
+
     extraUpFlags = lib.mkOption {
       type = lib.types.listOf lib.types.str;
       default = [ ];
-      description = "Additional flags to pass to tailscale up";
+      description = "Additional flags to pass to `tailscale up`.";
     };
   };
 
   config = lib.mkIf cfg.enable {
     my.applications.tailscale = {
       enable = true;
-      inherit (cfg) acceptDns acceptRoutes extraUpFlags;
+
+      inherit (cfg)
+        acceptDns
+        acceptRoutes
+        advertiseRoutes
+        routingFeatures
+        openFirewall
+        extraSetFlags
+        extraUpFlags
+        ;
     };
   };
 }

profiles/platforms/laptop.nix

@@ -7,6 +7,5 @@
     };
     gui.camera.enable = true;
     identity.fingerprint.enable = true;
-    network.tailscale.enable = true;
   };
 }

profiles/workloads/srv.nix

@@ -1,7 +1,6 @@
 {
   my.features = {
     cli.base.sshServer = true;
-    network.tailscale.enable = true;
     services.container.enable = true;
   };
 }

profiles/workloads/tailscale/client.nix

@@ -0,0 +1,8 @@
+{
+  my.features.network.tailscale = {
+    enable = true;
+
+    acceptDns = false;
+    acceptRoutes = true;
+  };
+}

profiles/workloads/tailscale/server.nix

@@ -0,0 +1,12 @@
+{
+  my.features.network.tailscale = {
+    enable = true;
+
+    acceptDns = false;
+    acceptRoutes = false;
+
+    advertiseRoutes = [
+      "10.50.0.0/16"
+    ];
+  };
+}