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net/portmapper, wgengine/monitor: cache gateway IP info until link changes

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Cuts down allocs & CPU in steady state (on regular STUN probes) when network
is unchanging.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2021-03-15 13:58:10 -07:00
parent d580b3f09e
commit 44ab0acbdb
6 changed files with 49 additions and 8 deletions
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1
wgengine/userspace.go
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@@ -270,6 +270,7 @@ func newUserspaceEngine(logf logger.Logf, rawTUNDev tun.Device, conf Config) (_
DERPActiveFunc: e.RequestStatus,
IdleFunc: e.tundev.IdleDuration,
NoteRecvActivity: e.noteReceiveActivity,
LinkMonitor: e.linkMon,
}
var err error
e.magicConn, err = magicsock.NewConn(magicsockOpts)