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wgengine/magicsock: improve endpoint selection for WireGuard peers with rx time

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If we don't have the ICMP hint available, such as on Android, we can use
the signal of rx traffic to bias toward a particular endpoint.

We don't want to stick to a particular endpoint for a very long time
without any signals, so the sticky time is reduced to 1 second, which is
large enough to avoid excessive packet reordering in the common case,
but should be small enough that either rx provides a strong signal, or
we rotate in a user-interactive schedule to another endpoint, improving
the feel of failover to other endpoints.

Updates #8999

Co-authored-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>

Signed-off-by: James Tucker <james@tailscale.com>
Signed-off-by: Charlotte Brandhorst-Satzkorn <charlotte@tailscale.com>
This commit is contained in:
James Tucker
2023-08-21 17:09:35 -07:00
committed by James Tucker
parent 5edb39d032
commit e1c7e9b736
4 changed files with 177 additions and 86 deletions
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2
wgengine/magicsock/derp.go
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@@ -664,7 +664,7 @@ func (c *Conn) processDERPReadResult(dm derpReadResult, b []byte) (n int, ep *en
return 0, nil
}
ep.noteRecvActivity()
ep.noteRecvActivity(ipp)
if stats := c.stats.Load(); stats != nil {
stats.UpdateRxPhysical(ep.nodeAddr, ipp, dm.n)
}