Brad Fitzpatrick 2506ede862 wgengine,ipn/ipnlocal: remove Engine.PeerKeyForIP and the engine's peer route table ...

The engine kept its own longest-prefix-match table (peerByIPRoute),
rebuilt from the full peer list on every reconfig, to route outbound
packets and answer PeerKeyForIP. That's now the route manager's job:
LocalBackend already installs a PeerByIPPacketFunc backed by the
RouteManager's incrementally-maintained outbound table, so the
engine's copy was redundant state with redundant O(n peers) rebuild
work.

Delete the table, the PeerKeyForIP interface method, and the BART-only
default callback. LocalBackend's peerForIP now queries the
RouteManager's outbound table directly for the subnet-route and
exit-node fallback. Engines running without a LocalBackend (such as
wgengine/bench) must install their own outbound peer lookup, since the
device's standard AllowedIPs trie only covers peers that already
exist and can't lazily create them.

Updates #12542

Change-Id: I25100399e273ed6c2bb1f6136b7cd81bc83e7313
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

2026-07-13 14:38:55 -07:00

..

bench_test.go

all: remove AUTHORS file and references to it

2026-01-23 15:49:45 -08:00

bench.go

all: remove AUTHORS file and references to it

2026-01-23 15:49:45 -08:00

trafficgen.go

all: remove AUTHORS file and references to it

2026-01-23 15:49:45 -08:00

wg.go

wgengine,ipn/ipnlocal: remove Engine.PeerKeyForIP and the engine's peer route table

2026-07-13 14:38:55 -07:00