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ts_runtime: wait to build routes until derp map is populated #282

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ts_runtime: wait to build routes until derp map is populated #282

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e9c3f80
ts_runtime: wait to build routes until derp map is populated
dylan-tailscale Jul 15, 2026
20a632b
ts_runtime: is_initialized -> seen_derp
dylan-tailscale Jul 16, 2026
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23 changes: 15 additions & 8 deletions ts_runtime/src/route_updater.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,8 @@ pub struct RouteUpdater {
derp_transport_map: DerpTransportMap,
peer_state: Arc<PeerState>,
env: Env,
/// Prevents building routes until the first `DerpTransportMap` has been processed.
seen_derp: bool,
}

impl RouteUpdater {
Expand All @@ -26,8 +28,11 @@ impl RouteUpdater {
"reconstructing routes for peer update"
);

let mut overlay_out = ts_bart::Table::default();
let mut underlay_out = HashMap::default();
let mut routes = PeerRoutesInner::default();
if !self.seen_derp {
tracing::debug!("not building routes, derp map unpopulated");
return routes;
}

for (id, peer) in self.peer_state.peers.peers() {
let span = tracing::trace_span!(
Expand All @@ -46,7 +51,7 @@ impl RouteUpdater {
match self.derp_transport_map.0.get(&region) {
Some(&transport_id) => {
span.record("underlay_transport", tracing::field::debug(transport_id));
underlay_out.insert(*id, transport_id);
routes.underlay_routes.insert(*id, transport_id);
}
None => {
tracing::error!("no region stored in multiderp, no underlay route");
Expand All @@ -56,14 +61,13 @@ impl RouteUpdater {
tracing::trace!(routes = ?peer.accepted_routes);

for route in &peer.accepted_routes {
overlay_out.insert(*route, OutboundRouteAction::Wireguard(*id));
routes
.overlay_out_routes
.insert(*route, OutboundRouteAction::Wireguard(*id));
}
}

PeerRoutesInner {
underlay_routes: underlay_out,
overlay_out_routes: overlay_out,
}
routes
}
}

Expand All @@ -86,6 +90,7 @@ impl kameo::Actor for RouteUpdater {
derp_transport_map: DerpTransportMap::default(),
peer_state: Default::default(),
env,
seen_derp: false,
})
}
}
Expand All @@ -100,6 +105,7 @@ pub struct PeerRouteUpdate {
pub inner: Arc<PeerRoutesInner>,
}

#[derive(Default)]
pub struct PeerRoutesInner {
pub underlay_routes: HashMap<PeerId, UnderlayTransportId>,
pub overlay_out_routes: ts_bart::Table<OutboundRouteAction>,
Expand Down Expand Up @@ -136,6 +142,7 @@ impl Message<DerpTransportMap> for RouteUpdater {
tracing::debug!("derp transport map changed, building new routes");

self.derp_transport_map = msg;
self.seen_derp = true;

let new_routes = self.build_routes();
if let Err(e) = self
Expand Down