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ipn/ipnlocal: consider all DERP regions for exit node recommendations

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When recommending an exit node, suggestExitNodeLocked ranks candidates by
the latency to their home DERP region, taken from the most recent netcheck
report. But netcheck alternates between full reports, which probe every
region, and incremental reports, which only re-probe the home region and a
handful of the fastest regions. When the most recent report is incremental,
the suggestion fell back to a random for exit nodes that are far away.

Now we rank candidates against the best recent latency, tracked by the
`netcheck.Client` - the same data that is used to pick the preferred
DERP. It uses a history of measurements which includes a full netcheck
report, so should cover all DERP regions.

Updates tailscale/corp#17516

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov
2026-06-22 12:28:09 +02:00
committed by Anton Tolchanov
parent 6a275c01db
commit f442cda999
9 changed files with 240 additions and 78 deletions
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cmd/k8s-operator/depaware.txt
+1 -1
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@@ -792,7 +792,7 @@ tailscale.com/cmd/k8s-operator dependencies: (generated by github.com/tailscale/
tailscale.com/net/ipset from tailscale.com/ipn/ipnlocal+
tailscale.com/net/memnet from tailscale.com/tsnet
tailscale.com/net/netaddr from tailscale.com/ipn+
tailscale.com/net/netcheck from tailscale.com/ipn/ipnlocal+
tailscale.com/net/netcheck from tailscale.com/wgengine/magicsock
tailscale.com/net/neterror from tailscale.com/net/dns/resolver+
tailscale.com/net/netkernelconf from tailscale.com/ipn/ipnlocal
tailscale.com/net/netknob from tailscale.com/logpolicy+
cmd/tailscaled/depaware-min.txt
+1 -1
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@@ -95,7 +95,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/flowtrack from tailscale.com/wgengine/filter
tailscale.com/net/ipset from tailscale.com/ipn/ipnlocal+
tailscale.com/net/netaddr from tailscale.com/ipn+
tailscale.com/net/netcheck from tailscale.com/ipn/ipnlocal+
tailscale.com/net/netcheck from tailscale.com/wgengine/magicsock
tailscale.com/net/neterror from tailscale.com/net/batching+
tailscale.com/net/netkernelconf from tailscale.com/ipn/ipnlocal
tailscale.com/net/netknob from tailscale.com/logpolicy+
cmd/tailscaled/depaware-minbox.txt
+1 -1
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@@ -112,7 +112,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/flowtrack from tailscale.com/wgengine/filter
tailscale.com/net/ipset from tailscale.com/ipn/ipnlocal+
tailscale.com/net/netaddr from tailscale.com/ipn+
tailscale.com/net/netcheck from tailscale.com/ipn/ipnlocal+
tailscale.com/net/netcheck from tailscale.com/cmd/tailscale/cli+
tailscale.com/net/neterror from tailscale.com/net/batching+
tailscale.com/net/netkernelconf from tailscale.com/ipn/ipnlocal
tailscale.com/net/netknob from tailscale.com/logpolicy+
cmd/tsidp/depaware.txt
+1 -1
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@@ -191,7 +191,7 @@ tailscale.com/cmd/tsidp dependencies: (generated by github.com/tailscale/depawar
tailscale.com/net/ipset from tailscale.com/ipn/ipnlocal+
tailscale.com/net/memnet from tailscale.com/tsnet
tailscale.com/net/netaddr from tailscale.com/ipn+
tailscale.com/net/netcheck from tailscale.com/ipn/ipnlocal+
tailscale.com/net/netcheck from tailscale.com/wgengine/magicsock
tailscale.com/net/neterror from tailscale.com/net/dns/resolver+
tailscale.com/net/netkernelconf from tailscale.com/ipn/ipnlocal
tailscale.com/net/netknob from tailscale.com/logpolicy+