kurogeek
7469976750
The router service only opens SSH to the mgmt VLAN, the staging port and the ZeroTier mesh. Also admit it on the yggdrasil interface (`ygg`, as named by clan-core's service) so the box stays reachable when ZeroTier is down. Interface-scoped, so a spoofed 200::/7 source on the WAN never matches.
117 lines
4.4 KiB
Nix
117 lines
4.4 KiB
Nix
{
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config,
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inputs,
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lib,
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pkgs,
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...
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}:
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{
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imports = [
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inputs.matthew-hardware.nixosModules.mt7986a-glinet-gl-mt6000
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];
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# matthew-hardware's common/generic-uefi-image.nix still sets
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# `image.repart.enable = true`; nixpkgs removed that option (importing
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# image/repart.nix now always defines system.build.image). Declare it so the
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# definition has somewhere to land. Drop once upstream stops setting it.
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options.image.repart.enable = lib.mkOption {
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type = lib.types.bool;
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default = true;
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internal = true;
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};
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config = {
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hardware.mt7986a-glinet-gl-mt6000.enable = true;
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hardware.mt7986a-glinet-gl-mt6000.zealous = true;
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hardware.mt7986a-glinet-gl-mt6000.image.repart.enable = true;
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nixpkgs.hostPlatform.system = "aarch64-linux";
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nixpkgs.buildPlatform.system = "x86_64-linux";
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system.stateVersion = "26.11";
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clan.core.sops.defaultGroups = [ "admins" ];
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clan.core.settings.name = "stellio";
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clan.core.settings.machine.description = "Flint-2 router";
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# Root is ext4 on the Flint 2's eMMC: keep steady-state writes off it.
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# The journal is persistent but bounded (256M) and synced once a minute
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# (the router needs logs for pppd/kea debugging and, after the Sep 2026
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# unlogged reboots, for post-mortem; volatile storage left nothing).
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# /tmp is tmpfs, no core dumps, and ext4 skips atime updates and
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# flushes its journal every 60 s instead of 5 s so the small periodic
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# writes (Kea leases, timesyncd clock, speedtest textfile, journal)
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# coalesce. A power cut loses at most a minute of that state.
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fileSystems."/".options = [
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"noatime"
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"commit=60"
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];
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boot.tmp.useTmpfs = true;
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services.journald.settings.Journal = {
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Storage = "persistent";
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SystemMaxUse = "256M";
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SyncIntervalSec = "1m";
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};
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systemd.coredump.enable = false;
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# Upstream 07d9958739 (mainline 2026-05, not in linux-6.18.y). The MT7531
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# switch on the Flint 2 hangs off MDIO, and mt7530_get_stats64 took the
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# MDIO mutex under the RCU read lock that /proc/net/dev holds, so any
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# stats reader (zerotier-one, node exporter, `ip -s link`) that raced a
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# PHY access oopsed the box: "BUG: scheduling while atomic" ->
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# "Unable to handle kernel paging request" on 2026-09-20 09:02 UTC.
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# Drop once boot.kernelPackages moves to a kernel that carries it.
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boot.kernelPatches = [
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{
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name = "mt7530-get-stats64-atomic";
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patch = ./mt7530-get-stats64-atomic.patch;
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}
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];
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# nixpkgs' services.blocky check runs the aarch64 blocky in a
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# system.checks derivation, which an x86_64 builder without binfmt cannot
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# execute (`--max-jobs 0` -> Exec format error). Validate the same YAML
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# with the build host's blocky instead. Drop once cnx-network's router
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# service carries this itself (router/dns: validate the Blocky config
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# with the build host's binary).
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services.blocky.enableConfigCheck = false;
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system.checks = [
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(pkgs.runCommand "check-blocky-config" { } ''
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${lib.getExe pkgs.buildPackages.blocky} --config ${
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(pkgs.formats.yaml { }).generate "blocky-config.yaml" config.services.blocky.settings
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} validate && touch $out
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'')
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];
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# The router service opens SSH only to the mgmt VLAN, the staging port
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# and the ZeroTier mesh (inventories/router.nix). Also admit it over
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# Yggdrasil (fleet-wide instance in inventories/default.nix) so the box
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# stays reachable when ZeroTier's controller/relays are down. Scoped to
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# the tunnel interface (clan-core's yggdrasil service names it `ygg`):
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# only decrypted 200::/7 traffic arrives there, so a spoofed source on
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# the WAN never matches.
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networking.firewall.interfaces.${config.services.yggdrasil.settings.IfName}.allowedTCPPorts = [
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22
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];
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systemd.services.heartbeat-push = {
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description = "Heartbeat push to uptime monitor";
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${pkgs.curl}/bin/curl -s -o /dev/null https://uptime.b4l.co.th/api/push/X0WCHAcY5gPf1U8If7BT1FLjpacZqGZu?status=up&msg=OK&ping=";
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};
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};
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systemd.timers.heartbeat-push = {
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description = "Heartbeat push timer";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnBootSec = "60s";
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OnUnitActiveSec = "60s";
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Unit = "heartbeat-push.service";
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};
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};
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};
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}
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