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PMTUD exploration, start small then grow

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This commit is contained in:
Nate Brown
2026-05-05 17:05:50 -05:00
parent 33c2d7277c
commit 16a836a73f
33 changed files with 1036 additions and 11 deletions
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11
connection_manager.go
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@@ -145,6 +145,7 @@ func (cm *connectionManager) getAndResetTrafficCheck(h *HostInfo, now time.Time)
func (cm *connectionManager) AddTrafficWatch(h *HostInfo) {
if h.out.Swap(true) == false {
cm.trafficTimer.Add(h.localIndexId, cm.checkInterval)
cm.intf.pmtudManager.OnTunnelUp(h)
}
}
@@ -180,6 +181,7 @@ func (cm *connectionManager) doTrafficCheck(localIndex uint32, p, nb, out []byte
switch decision {
case deleteTunnel:
cm.intf.pmtudManager.OnTunnelDown(hostinfo)
if cm.hostMap.DeleteHostInfo(hostinfo) {
// Only clearing the lighthouse cache if this is the last hostinfo for this vpn ip in the hostmap
cm.intf.lightHouse.DeleteVpnAddrs(hostinfo.vpnAddrs)
@@ -199,7 +201,14 @@ func (cm *connectionManager) doTrafficCheck(localIndex uint32, p, nb, out []byte
cm.tryRehandshake(hostinfo)
case sendTestPacket:
cm.intf.SendMessageToHostInfo(header.Test, header.TestRequest, hostinfo, p, nb, out)
// Defer to pmtud if it has a confirmed PMTU > floor for this peer:
// the probe at the confirmed size verifies both liveness AND that
// the discovered PMTU still fits, so we don't burn a separate test
// packet on top of it. If pmtud declines (disabled, peer unsupported,
// or no confirmed size yet) we fall back to the regular test.
if !cm.intf.pmtudManager.MaybeProbeAsTest(hostinfo) {
cm.intf.SendMessageToHostInfo(header.Test, header.TestRequest, hostinfo, p, nb, out)
}
}
cm.resetRelayTrafficCheck(hostinfo)