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Merge pull request #201119 from Enzime/remove-tailscale-warning

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nixos/tailscale: Add `useRoutingFeatures` option
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Ryan Lahfa 2022-12-17 15:44:07 +01:00 committed by GitHub
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3 changed files with 37 additions and 8 deletions
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14
nixos/doc/manual/from_md/release-notes/rl-2305.section.xml
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@ -282,6 +282,20 @@
to match upstream.
</para>
</listitem>
<listitem>
<para>
The new option
<literal>services.tailscale.useRoutingFeatures</literal>
controls various settings for using Tailscale features like
exit nodes and subnet routers. If you wish to use your machine
as an exit node, you can set this setting to
<literal>server</literal>, otherwise if you wish to use an
exit node you can set this setting to
<literal>client</literal>. The strict RPF warning has been
removed as the RPF will be loosened automatically based on the
value of this setting.
</para>
</listitem>
</itemizedlist>
</section>
</section>

2
nixos/doc/manual/release-notes/rl-2305.section.md
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@ -81,3 +81,5 @@ In addition to numerous new and upgraded packages, this release has the followin
- The `services.fwupd` module now allows arbitrary daemon settings to be configured in a structured manner ([`services.fwupd.daemonSettings`](#opt-services.fwupd.daemonSettings)).
- The `unifi-poller` package and corresponding NixOS module have been renamed to `unpoller` to match upstream.
- The new option `services.tailscale.useRoutingFeatures` controls various settings for using Tailscale features like exit nodes and subnet routers. If you wish to use your machine as an exit node, you can set this setting to `server`, otherwise if you wish to use an exit node you can set this setting to `client`. The strict RPF warning has been removed as the RPF will be loosened automatically based on the value of this setting.

29
nixos/modules/services/networking/tailscale.nix
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@ -4,10 +4,7 @@ with lib;
let
cfg = config.services.tailscale;
firewallOn = config.networking.firewall.enable;
rpfMode = config.networking.firewall.checkReversePath;
isNetworkd = config.networking.useNetworkd;
rpfIsStrict = rpfMode == true || rpfMode == "strict";
in {
meta.maintainers = with maintainers; [ danderson mbaillie twitchyliquid64 ];
@ -38,14 +35,23 @@ in {
defaultText = literalExpression "pkgs.tailscale";
description = lib.mdDoc "The package to use for tailscale";
};
useRoutingFeatures = mkOption {
type = types.enum [ "none" "client" "server" "both" ];
default = "none";
example = "server";
description = lib.mdDoc ''
Enables settings required for Tailscale's routing features like subnet routers and exit nodes.
To use these these features, you will still need to call `sudo tailscale up` with the relevant flags like `--advertise-exit-node` and `--exit-node`.
When set to `client` or `both`, reverse path filtering will be set to loose instead of strict.
When set to `server` or `both`, IP forwarding will be enabled.
'';
};
};
config = mkIf cfg.enable {
warnings = optional (firewallOn && rpfIsStrict) ''
Strict reverse path filtering breaks Tailscale exit node use and some subnet routing setups. Consider setting:
networking.firewall.checkReversePath = "loose";
'';
environment.systemPackages = [ cfg.package ]; # for the CLI
systemd.packages = [ cfg.package ];
systemd.services.tailscaled = {
@ -75,6 +81,13 @@ in {
stopIfChanged = false;
};
boot.kernel.sysctl = mkIf (cfg.useRoutingFeatures == "server" || cfg.useRoutingFeatures == "both") {
"net.ipv4.conf.all.forwarding" = mkDefault true;
"net.ipv6.conf.all.forwarding" = mkDefault true;
};
networking.firewall.checkReversePath = mkIf (cfg.useRoutingFeatures == "client" || cfg.useRoutingFeatures == "both") "loose";
networking.dhcpcd.denyInterfaces = [ cfg.interfaceName ];
systemd.network.networks."50-tailscale" = mkIf isNetworkd {