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ipn/ipnlocal: use routecheck reports to make exit node suggestions

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Now that the routecheck subsystem is continuously collecting
reachability reports in the background, we can add a hook to
LocalBackend for fetching its report. That allows
suggestExitNodeUsingTrafficSteering to consult that report when
disqualifying candidates, instead of blocking on an immediate probe.

Exit node suggestions will only consult the report when the
`client-side-reachability` and `client-side-reachability-routecheck`
node attributes are both set on the current node.

Updates #17366
Updates tailscale/corp#33033

Signed-off-by: Simon Law <sfllaw@tailscale.com>
This commit is contained in:
Simon Law
2026-07-02 20:26:27 -07:00
committed by Simon Law
parent cb7e536804
commit 932260511e
19 changed files with 306 additions and 74 deletions
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cmd/derper/depaware.txt
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@@ -108,6 +108,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
tailscale.com/net/netutil from tailscale.com/client/local
tailscale.com/net/netx from tailscale.com/net/dnscache+
tailscale.com/net/routecheck from tailscale.com/client/local
tailscale.com/net/routecheck/peernode from tailscale.com/net/routecheck
tailscale.com/net/sockstats from tailscale.com/derp/derphttp
tailscale.com/net/stun from tailscale.com/net/stunserver
tailscale.com/net/stunserver from tailscale.com/cmd/derper