Amal Bansode 04ef9d80b5 ipn/ipnlocal: add a map for node public key to node ID lookups (#19051) ...

This path is currently only used by DERP servers that have also
enabled `verify-clients` to ensure that only authorized clients
within a Tailnet are allowed to use said DERP server.

The previous naive linear scan in NodeByKey would almost
certainly lead to bad outcomes with a large enough netmap, so
address an existing todo by building a map of node key -> node ID.

Updates #19042

Signed-off-by: Amal Bansode <amal@tailscale.com>

2026-03-23 10:23:28 -07:00

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