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e09d51c1a8
forwardWithTunnelPeer previously accepted any RFC1918 / ULA / CGNAT source IP, so a public client whose address happened to fall in those ranges could bypass the configured operator auth scheme by colliding with a known tunnel IP. The fast-path is now gated on TunnelLookupFromContext(r.Context()) being present — that context value is attached only by the per-account inbound (overlay) listener, so the host-facing listener never enters this branch. Tests updated to reflect the new requirement: requests that don't carry the inbound marker now fall through to the regular auth flow.