WIP: router: tailscale

a

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "crane": {
       "locked": {
-        "lastModified": 1754269165,
+        "lastModified": 1781825982,
-        "narHash": "sha256-0tcS8FHd4QjbCVoxN9jI+PjHgA4vc/IjkUSp+N3zy0U=",
+        "narHash": "sha256-SlXKwIRIhrOSAcTjCB3ftPLzJWZStQIPS7J1FlZPnKk=",
         "owner": "ipetkov",
         "repo": "crane",
-        "rev": "444e81206df3f7d92780680e45858e31d2f07a08",
+        "rev": "469fd08d0bcf6926321fa973c6777fbc87785dd7",
         "type": "github"
       },
       "original": {
@@ -18,45 +18,24 @@
     "flake-compat": {
       "flake": false,
       "locked": {
-        "lastModified": 1747046372,
+        "lastModified": 1767039857,
-        "narHash": "sha256-CIVLLkVgvHYbgI2UpXvIIBJ12HWgX+fjA8Xf8PUmqCY=",
+        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
-        "owner": "edolstra",
+        "owner": "NixOS",
         "repo": "flake-compat",
-        "rev": "9100a0f413b0c601e0533d1d94ffd501ce2e7885",
+        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
         "type": "github"
       },
       "original": {
-        "owner": "edolstra",
+        "owner": "NixOS",
         "repo": "flake-compat",
         "type": "github"
       }
     },
-    "flake-parts": {
-      "inputs": {
-        "nixpkgs-lib": [
-          "lanzaboote",
-          "nixpkgs"
-        ]
-      },
-      "locked": {
-        "lastModified": 1754091436,
-        "narHash": "sha256-XKqDMN1/Qj1DKivQvscI4vmHfDfvYR2pfuFOJiCeewM=",
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "rev": "67df8c627c2c39c41dbec76a1f201929929ab0bd",
-        "type": "github"
-      },
-      "original": {
-        "owner": "hercules-ci",
-        "repo": "flake-parts",
-        "type": "github"
-      }
-    },
     "gitignore": {
       "inputs": {
         "nixpkgs": [
           "lanzaboote",
-          "pre-commit-hooks-nix",
+          "pre-commit",
           "nixpkgs"
         ]
       },
@@ -81,11 +60,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1765480374,
+        "lastModified": 1791642191,
-        "narHash": "sha256-HlbvQAqLx7WqZFFQZ8nu5UUJAVlXiV/kqKbyueA8srw=",
+        "narHash": "sha256-0bK0A59rVUn1SRZzo4cNi4VSqAe7vR1gL2/MZl53Frw=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "39cb677ed9e908e90478aa9fe5f3383dfc1a63f3",
+        "rev": "c58f54c733a7894d84fa2fdff26cc12088c4b78c",
         "type": "github"
       },
       "original": {
@@ -97,25 +76,23 @@
     "lanzaboote": {
       "inputs": {
         "crane": "crane",
-        "flake-compat": "flake-compat",
-        "flake-parts": "flake-parts",
         "nixpkgs": [
           "nixpkgs"
         ],
-        "pre-commit-hooks-nix": "pre-commit-hooks-nix",
+        "pre-commit": "pre-commit",
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1762205063,
+        "lastModified": 1782141370,
-        "narHash": "sha256-If6vQ+KvtKs3ARBO9G3l+4wFSCYtRBrwX1z+I+B61wQ=",
+        "narHash": "sha256-hqijVSEETttmo8Okql9/LG0Ua34hdciKW1a5zzlj8mU=",
         "owner": "nix-community",
         "repo": "lanzaboote",
-        "rev": "88b8a563ff5704f4e8d8e5118fb911fa2110ca05",
+        "rev": "7c9a54a7f87b4539ddbd8bda09a8a5f5f9361aa9",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
-        "ref": "v0.4.3",
+        "ref": "v1.1.0",
         "repo": "lanzaboote",
         "type": "github"
       }
@@ -143,11 +120,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1764234087,
+        "lastModified": 1769813415,
-        "narHash": "sha256-NHF7QWa0ZPT8hsJrvijREW3+nifmF2rTXgS2v0tpcEA=",
+        "narHash": "sha256-nnVmNNKBi1YiBNPhKclNYDORoHkuKipoz7EtVnXO50A=",
         "owner": "nix-community",
         "repo": "nixos-generators",
-        "rev": "032a1878682fafe829edfcf5fdfad635a2efe748",
+        "rev": "8946737ff703382fda7623b9fab071d037e897d5",
         "type": "github"
       },
       "original": {
@@ -158,11 +135,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1765186076,
+        "lastModified": 1791594108,
-        "narHash": "sha256-hM20uyap1a0M9d344I692r+ik4gTMyj60cQWO+hAYP8=",
+        "narHash": "sha256-XK4KceonkwD8LuMAt/vNrz982mXJM5jeHAxMwsUXXAQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "addf7cf5f383a3101ecfba091b98d0a1263dc9b8",
+        "rev": "6510408d147d8c5e6d76043e899e9251756f6a75",
         "type": "github"
       },
       "original": {
@@ -182,11 +159,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1763909441,
+        "lastModified": 1785762349,
-        "narHash": "sha256-56LwV51TX/FhgX+5LCG6akQ5KrOWuKgcJa+eUsRMxsc=",
+        "narHash": "sha256-jZhZkzAwc7f3exzcTDJWP2WCAchCv0iNC3UF/QsahdQ=",
         "owner": "nix-community",
         "repo": "plasma-manager",
-        "rev": "b24ed4b272256dfc1cc2291f89a9821d5f9e14b4",
+        "rev": "a19a2a029fa180911bd89c554dca1616e10f4c1d",
         "type": "github"
       },
       "original": {
@@ -195,12 +172,9 @@
         "type": "github"
       }
     },
-    "pre-commit-hooks-nix": {
+    "pre-commit": {
       "inputs": {
-        "flake-compat": [
+        "flake-compat": "flake-compat",
-          "lanzaboote",
-          "flake-compat"
-        ],
         "gitignore": "gitignore",
         "nixpkgs": [
           "lanzaboote",
@@ -208,11 +182,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1750779888,
+        "lastModified": 1781733627,
-        "narHash": "sha256-wibppH3g/E2lxU43ZQHC5yA/7kIKLGxVEnsnVK1BtRg=",
+        "narHash": "sha256-U3yTuGBnmXvXoQI3qkpfEDsn9RovQPAjN7ndRco+3u0=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "16ec914f6fb6f599ce988427d9d94efddf25fe6d",
+        "rev": "3bbec39bc90eadfa031e6f3b77272f3f60803e39",
         "type": "github"
       },
       "original": {
@@ -239,11 +213,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1761791894,
+        "lastModified": 1782012058,
-        "narHash": "sha256-myRIDh+PxaREz+z9LzbqBJF+SnTFJwkthKDX9zMyddY=",
+        "narHash": "sha256-9mWUnReOUXfKjZuJAL/bAFH3LUyECTRtXgSNVjRw3UY=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "59c45eb69d9222a4362673141e00ff77842cd219",
+        "rev": "8534567325bd8a8d2928e6afd81e0a87d19efd3c",
         "type": "github"
       },
       "original": {
@@ -259,11 +233,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1763929380,
+        "lastModified": 1787124737,
-        "narHash": "sha256-Yc7gZME/lcHoJH6bMPCG7CyjKWhOLJPqLI8MXtyKPHo=",
+        "narHash": "sha256-EnQcFCdcQs1agb8U/h3kn7+A3c3uorANCPP2WakZjAk=",
         "owner": "Platonic-Systems",
         "repo": "secrix",
-        "rev": "c6e3ca7af47c329dcf442a3d017ae171eee5612f",
+        "rev": "9c0a7db4e355c28fe67643656821b06161b4df61",
         "type": "github"
       },
       "original": {

flake.nix

@@ -23,7 +23,7 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
     lanzaboote = {
-      url = "github:nix-community/lanzaboote/v0.4.3";
+      url = "github:nix-community/lanzaboote/v1.1.0";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };

home/modules/fish.nix

@@ -5,11 +5,11 @@
     enable = true;
     shellInit = "set fish_greeting";
     shellAliases = {
-      # Replace ls with exa
+      # Replace ls with eza
-      ls = "exa -al --color=always --group-directories-first --icons"; # preferred listing
+      ls = "eza -al --color=always --group-directories-first --icons=always"; # preferred listing
-      la = "exa -a --color=always --group-directories-first --icons";  # all files and dirs
+      la = "eza -a --color=always --group-directories-first --icons=always";  # all files and dirs
-      ll = "exa -l --color=always --group-directories-first --icons";  # long format
+      ll = "eza -l --color=always --group-directories-first --icons=always";  # long format
-      lt = "exa -aT --color=always --group-directories-first --icons"; # tree listing
+      lt = "eza -aT --color=always --group-directories-first --icons=always"; # tree listing
       "l." = "exa -a | rg '^\.'";                                      # show only dotfiles
 
       # Replace cat with bat

hosts/Yura-PC/default.nix

@@ -31,6 +31,10 @@
     intel-media-driver # LIBVA_DRIVER_NAME=iHD
   ];
 
+  environment.systemPackages = with pkgs; [
+    lmstudio
+  ];
+
   networking.hostName = "Yura-PC"; # Define your hostname.
   networking.hostId = "110a2814"; # Required for ZFS.
 

hosts/common-desktop.nix

@@ -7,12 +7,20 @@
     "sysrq_always_enabled=1"
   ];
 
-  boot.kernelPackages = pkgs.linuxKernel.packages.linux_6_17;
+  boot.kernelPackages = pkgs.linuxKernel.packages.linux_7_2;
   boot.loader = {
     efi.canTouchEfiVariables = true;
     timeout = 3;
     systemd-boot.enable = lib.mkDefault true;
   };
+  boot.kernel.sysctl = {
+    # https://wiki.archlinux.org/title/Zram#Optimizing_swap_on_zram
+    "vm.swappiness" = 180;
+    "vm.watermark_boost_factor" = 0;
+    "vm.watermark_scale_factor" = 125;
+    "vm.page-cluster" = 0;
+  };
+  zramSwap.enable = true;
 
   # https://nixos.wiki/wiki/Accelerated_Video_Playback
   hardware.graphics.enable = true;
@@ -30,8 +38,7 @@
   services.xserver.enable = false;
 
   # Enable the KDE Plasma Desktop Environment.
-  services.displayManager.sddm.enable = true;
+  services.displayManager.plasma-login-manager.enable = true;
-  services.displayManager.sddm.wayland.enable = true;
   services.desktopManager.plasma6.enable = true;
 
   # Enable CUPS to print documents.
@@ -65,16 +72,16 @@
   programs.wireshark.package = pkgs.wireshark; # wireshark-cli by default
   programs.bat.enable = true;
   programs.htop.enable = true;
+  programs.nix-ld.enable = true;
+  # programs.steam.enable = true;
 
   # https://nixos.wiki/wiki/Docker
   virtualisation.docker.enable = true;
   virtualisation.docker.enableOnBoot = false;
-  virtualisation.docker.package = pkgs.docker_28;
 
   # https://github.com/flatpak/flatpak/issues/2861
   xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
 
-  workarounds.flatpak.enable = true;
   fonts.packages = with pkgs; [
     fantasque-sans-mono
     nerd-fonts.fantasque-sans-mono
@@ -110,10 +117,10 @@
     powertop
     rbw
     restic
-    resticprofile
     rclone
     ripgrep-all
     rustscan
+    unrar
     whois
     wireguard-tools
     yt-dlp
@@ -133,22 +140,31 @@
       ];
     })
     nextcloud-client
+    # lutris
     lxqt.pavucontrol-qt
     pinentry-all
     tela-circle-icon-theme
+    typst
     virt-viewer
     waypipe
   ] ++ [
     # jetbrains.rust-rover
     # jetbrains.goland
     jetbrains.clion
-    jetbrains.idea-ultimate
+    # jetbrains.idea
-    jetbrains.pycharm-professional
+    jetbrains.pycharm
     jetbrains.webstorm
     android-studio
     rustup
     zed-editor
     package-version-server # for zed
+    antigravity-cli
+    antigravity-ide-fhs
+    codex
+    # codex-acp
+    # github-copilot-cli
+    # opencode
+    # opencode-desktop
   ] ++ [
     # C
     gcc
@@ -159,27 +175,41 @@
     poetry
 
     # Haskell
+    cabal-install
+    haskell-language-server
+    # haskellPackages.hls-cabal-plugin
     haskellPackages.ghc
     haskellPackages.stack
 
     # Node
-    nodejs_22
+    nodejs_24
     pnpm
     bun
 
     # Nix
     nil
     nixd
-    nixfmt-rfc-style
+    nixfmt
 
     # Gleam
     gleam
-    beamMinimal26Packages.erlang
+    beamMinimal28Packages.erlang
     
     # Racket
     racket
     
     # Ruby
     ruby
+
+    # Java
+    zulu
+
+    # spacetimedb
+  ] ++ [
+    jujutsu
+    lazyjj
+    jjui
+    # jj-fzf
+    gg-jj
   ];
 }

hosts/router/hardware-configuration.nix

@@ -14,12 +14,12 @@
   boot.extraModulePackages = [ ];
 
   fileSystems."/" =
-    { device = "/dev/disk/by-uuid/f222513b-ded1-49fa-b591-20ce86a2fe7f";
+    { device = "/dev/disk/by-uuid/0dec41bf-aba0-4b7b-9f61-bbb572e5bd1e";
       fsType = "ext4";
     };
 
   fileSystems."/boot" =
-    { device = "/dev/disk/by-uuid/12CE-A600";
+    { device = "/dev/disk/by-uuid/9F5E-672F";
       fsType = "vfat";
       options = [ "fmask=0022" "dmask=0022" ];
     };

hosts/vm/default.nix

@@ -70,7 +70,6 @@
   # https://github.com/flatpak/flatpak/issues/2861
   xdg.portal.extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
 
-#  workarounds.flatpak.enable = true;
   fonts.packages = with pkgs; [
     noto-fonts-cjk-sans
     noto-fonts-cjk-serif

modules/default.nix

@@ -1,6 +1,5 @@
 { ... }: {
   imports = [
     ./opts
-    ./workarounds
   ];
 }

modules/router/default.nix

@@ -9,6 +9,7 @@ in
       ./opts.nix
       ./ifconfig.nix
       ./wireguard.nix
+      ./tailscale.nix
       ./firewall.nix
       ./dns.nix
       ./kea.nix
@@ -27,7 +28,7 @@ in
 
   boot.loader.timeout = 2;
   boot.loader.systemd-boot.configurationLimit = 5;
-  boot.kernelPackages = pkgs.linuxKernel.packages.linux_6_12;
+  boot.kernelPackages = pkgs.linuxKernel.packages.linux_6_18;
   boot.growPartition = true;
 
   # Enable the X11 windowing system.

modules/router/dns.nix

@@ -54,17 +54,17 @@ in
       enable_dnssec = true;
       bootstrap_dns = [ "1.1.1.1" "9.9.9.9" ];
       upstream_dns = [
-        # Default upstreams
-        "quic://p0.freedns.controld.com"
-        "tls://one.one.one.one"
-        "tls://dns.quad9.net"
-
         # Adguard uses upstream and not rewrite rules to resolve cname rewrites,
         # and obviously my sysdomain entries don't exist in cloudflare.
         "[/${sysdomain}/][::1]"           # Sys domains to self (for cname rewrites)
 
         "[/${ldomain}/][::1]:1053"        # Local domains to Knot (ddns)
         "[/home/][${ifs.lan.ulaPrefix}::250]"  # .home domains to opnsense (temporary)
+
+        # Default upstreams
+        "quic://p0.freedns.controld.com"
+        "tls://one.one.one.one"
+        "tls://dns.quad9.net"
       ];
     };
     # https://adguard-dns.io/kb/general/dns-filtering-syntax/

modules/router/firewall.nix

@@ -15,6 +15,11 @@ let
         ${ifs.lan50.name},
         ${ifs.wg0.name},
     }
+    # Tailscale is its own zone, since tailnet traffic is already filtered by tailscale ACLs
+    # and needs some special handling (exit node NAT with CGNAT/ULA addrs)
+    define ZONE_TAILSCALE_IFS = { ${ifs.ts0.name} }
+    define TAILSCALE_NET4 = ${ifs.ts0.net4}
+    define TAILSCALE_NET6 = ${ifs.ts0.net6}
     define OPNSENSE_NET6 = ${vars.extra.opnsense.net6}
     define ZONE_LAN_EXTRA_NET6 = {
         # TODO: reevaluate this statement
@@ -58,6 +63,7 @@ in
               udp . 48425 : ${vars.extra.opnsense.addr4} . 48425,
               # Amnezia VPN server
               udp . 37138 : ${vars.extra.amnezia.addr4} . 37138,
+              tcp . 38247 : ${vars.extra.amnezia.addr4} . 22,
               # Minecruft server
               tcp . 25565 : ${vars.extra.minecruft.addr4} . 25565,
               udp . 25565 : ${vars.extra.minecruft.addr4} . 25565,
@@ -79,6 +85,8 @@ in
 
           # Masquerade LAN addrs
           oifname $ZONE_WAN_IFS ip saddr $RFC1918 masquerade
+          # Masquerade tailnet addrs (tailscale exit node)
+          oifname $ZONE_WAN_IFS ip saddr $TAILSCALE_NET4 masquerade
       }
     '';
   };
@@ -96,12 +104,28 @@ in
     '';
   };
 
+  # IPv6 masquerading for tailnet addrs only (tailscale exit node)
+  # Tailscale only assigns ULAs from $TAILSCALE_NET6, so NAT is unavoidable here
+  networking.nftables.tables.nat6_tailscale = {
+    family = "ip6";
+    content = ''
+      ${nftIdentifiers}
+      chain postrouting {
+          type nat hook postrouting priority srcnat; policy accept;
+          oifname $ZONE_WAN_IFS ip6 saddr $TAILSCALE_NET6 masquerade
+      }
+    '';
+  };
+
   networking.nftables.tables.firewall = {
     family = "inet";
     content = ''
       ${nftIdentifiers}
       define ALLOWED_TCP_PORTS = { ssh }
-      define ALLOWED_UDP_PORTS = { ${toString vars.ifs.wg0.listenPort} }
+      define ALLOWED_UDP_PORTS = {
+          ${toString vars.ifs.wg0.listenPort},
+          ${toString vars.ifs.ts0.listenPort},  # tailscale direct connections
+      }
       define ALLOWED_TCP_LAN_PORTS = { ssh, https }
       define ALLOWED_UDP_LAN_PORTS = { bootps, dhcpv6-server, domain, https }
       set port_forward_v6 {
@@ -160,6 +184,8 @@ in
           # iifname $ZONE_LAN_IFS accept
           iifname $ZONE_LAN_IFS jump zone_lan_input
           ip6 saddr $ZONE_LAN_EXTRA_NET6 jump zone_lan_input
+          # Tailscale zone input rules
+          iifname $ZONE_TAILSCALE_IFS jump zone_tailscale_input
 
           # log
       }
@@ -175,6 +201,8 @@ in
           # LAN zone forward rules
           iifname $ZONE_LAN_IFS jump zone_lan_forward
           ip6 saddr $ZONE_LAN_EXTRA_NET6 jump zone_lan_forward
+          # Tailscale zone forward rules
+          iifname $ZONE_TAILSCALE_IFS jump zone_tailscale_forward
       }
 
       chain zone_wan_input {
@@ -214,6 +242,23 @@ in
 
           # Allow traffic between LANs
           oifname $ZONE_LAN_IFS accept
+
+          # Allow LAN to reach tailnet (no SNAT, tailnet peers see real LAN addrs)
+          oifname $ZONE_TAILSCALE_IFS accept
+      }
+
+      chain zone_tailscale_input {
+          # Tailnet access is restricted by tailscale ACLs, treat like LAN
+          jump zone_lan_input
+      }
+
+      chain zone_tailscale_forward {
+          # Subnet router: allow tailnet to LANs (advertised routes)
+          oifname $ZONE_LAN_IFS accept
+
+          # Exit node: allow tailnet to WAN (masqueraded in nat4 / nat6_tailscale)
+          oifname $ZONE_WAN_IFS ip saddr $TAILSCALE_NET4 accept
+          oifname $ZONE_WAN_IFS ip6 saddr $TAILSCALE_NET6 accept
       }
 
       chain output {

modules/router/ifconfig.nix

@@ -52,6 +52,9 @@ in
   # since my WAN and LAN20 are technically bridged.
   # https://networkengineering.stackexchange.com/questions/83071/why-linux-answers-arp-requests-for-ips-that-belong-to-different-network-interfac
   boot.kernel.sysctl."net.ipv4.conf.default.arp_filter" = 1;
+  # Later I discovered that rp_filter might also be good to set
+  # Strict mode (1) drops packets if the src ip isn't a local route on the interface
+  boot.kernel.sysctl."net.ipv4.conf.default.rp_filter" = 1;
 
   # It is impossible to do multiple prefix requests with networkd,
   # so I use dhcpcd for this

modules/router/secrets/grafana-secret-key.age

@@ -0,0 +1,5 @@
+age-encryption.org/v1
+-> ssh-ed25519 D2MY/A txjDSEsRr2CJtC9rDIiY9H8aX0us53vhnqJStt+XvlA
+vjmrx5ByEhbHE/hBEQq3gRqY8b5/mjHLs+He3D/27LM
+--- rp66vDf9qnM7f9S5YD/X/99YsufPWmvz+V8z8htB2Ow
+9‡Ài¨*¡-oš·}Ć(Š5[¬[ÕyKr)¾-­cùäóŽù¼R0?Ë8`Èô×{

modules/router/services.nix

@@ -29,10 +29,12 @@ in
   };
 
   # https://wiki.nixos.org/wiki/Grafana#Declarative_configuration
+  secrix.services.grafana.secrets.security-key.encrypted.file = ./secrets/grafana-secret-key.age;
   services.grafana = {
     enable = true;
     settings = {
       security.allow_embedding = true;
+      security.secret_key = "$__file{${config.secrix.services.grafana.secrets.security-key.decrypted.path}}";
       server = {
         http_port = 3001;
         domain = "grouter.${domain}";
@@ -57,8 +59,8 @@ in
   services.caddy = {
     enable = true;
     package = pkgs.caddy.withPlugins {
-      plugins = [ "github.com/caddy-dns/cloudflare@v0.2.1" ];
+      plugins = [ "github.com/caddy-dns/cloudflare@v0.2.4" ];
-      hash = "sha256-Dvifm7rRwFfgXfcYvXcPDNlMaoxKd5h4mHEK6kJ+T4A=";
+      hash = "sha256-xRJ5evsAJ2akg47j3Bt6YDXJOgX88B/rKNP50KSVyNY=";
     };
     virtualHosts."*.${domain}".extraConfig = ''
       encode

modules/router/tailscale.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+let
+  vars = import ./vars.nix config;
+  ifs = vars.ifs;
+  ts0 = ifs.ts0;
+
+  # Subnets advertised to the tailnet (still need to be approved in the admin console)
+  advertisedRoutes = [
+    "${vars.p4}.0.0/16"          # all LAN v4 subnets
+    "${vars.ulaPrefix}::/48"     # all LAN ULA subnets
+  ];
+in
+{
+  # One-time setup after deploying: `sudo tailscale up`
+  # (state is persisted in /var/lib/tailscale)
+  services.tailscale = {
+    enable = true;
+    port = ts0.listenPort;
+    interfaceName = ts0.name;
+    # Enables ip forwarding (already enabled globally by networkd anyway).
+    # Not using "both", since that sets rp_filter to loose on all interfaces.
+    useRoutingFeatures = "server";
+    # Firewall is managed manually in firewall.nix (networking.firewall is disabled)
+    openFirewall = false;
+    # Applied with `tailscale set` on every start, so these stay declarative
+    extraSetFlags = [
+      # Don't let tailscale touch nftables/iptables, all rules live in firewall.nix
+      "--netfilter-mode=off"
+      # Don't SNAT tailnet -> LAN traffic, LAN hosts route back via the router anyway
+      # (preserves real source addrs for logging/ACLs on LAN hosts)
+      "--snat-subnet-routes=false"
+      # The router is its own DNS server, don't let tailscale mess with resolv.conf
+      "--accept-dns=false"
+      "--advertise-routes=${lib.strings.concatStringsSep "," advertisedRoutes}"
+      "--advertise-exit-node"
+    ];
+  };
+
+  # networkd removes "foreign" ip rules when it (re)starts, which would wipe tailscale's
+  # policy routing rules (table 52). This is extra important since networkd is
+  # restarted every minute (see ifconfig.nix).
+  # The nixpkgs tailscale module already marks tailscale0 as unmanaged in networkd.
+  systemd.network.config.networkConfig.ManageForeignRoutingPolicyRules = false;
+}

modules/router/vars.nix

@@ -111,6 +111,14 @@ rec {
     } // {
       listenPort = 51944;
     };
+    # Tailscale addresses are assigned by the coordination server,
+    # these are the fixed ranges tailscale allocates node addrs from.
+    ts0 = {
+      name = "tailscale0";
+      listenPort = 41641;
+      net4 = "100.64.0.0/10";
+      net6 = "fd7a:115c:a1e0::/48";
+    };
   };
 
   extra = {

modules/workarounds/default.nix

@@ -1,5 +0,0 @@
-{
-  imports = [
-    ./flatpak.nix
-  ];
-}

modules/workarounds/flatpak.nix

@@ -1,44 +0,0 @@
-# https://github.com/knightpp/nixos-cfg/blob/main/modules/workarounds/flatpak.nix
-{
-  pkgs,
-  config,
-  lib,
-  ...
-}: let
-  cfg = config.workarounds.flatpak;
-in {
-  options = {
-    workarounds.flatpak = {
-      enable = lib.mkEnableOption "flatpak workaround";
-    };
-  };
-
-  config = lib.mkIf cfg.enable {
-    system.fsPackages = [pkgs.bindfs];
-    fileSystems = let
-      mkRoSymBind = path: {
-        device = path;
-        fsType = "fuse.bindfs";
-        options = ["ro" "resolve-symlinks" "x-gvfs-hide"];
-      };
-      aggregated = pkgs.buildEnv {
-        name = "system-fonts-and-icons";
-        paths = builtins.attrValues {
-          inherit (pkgs.kdePackages) breeze;
-          inherit
-            (pkgs)
-            noto-fonts
-            noto-fonts-color-emoji
-            noto-fonts-cjk-sans
-            noto-fonts-cjk-serif
-            ;
-        };
-        pathsToLink = ["/share/fonts" "/share/icons"];
-      };
-    in {
-      # Create an FHS mount to support flatpak host icons/fonts
-      "/usr/share/icons" = mkRoSymBind "${aggregated}/share/icons";
-      "/usr/share/fonts" = mkRoSymBind "${aggregated}/share/fonts";
-    };
-  };
-}