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wgengine/netstack: revert cubic cc to reno cc (#15677) (#15709)

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Cherry-picked from 62182fc37d44c0a8185b7d96f30465710dd68b66.

Updates google/gvisor#11632
Updates tailscale/corp#27717

Signed-off-by: Jordan Whited <jordan@tailscale.com>
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Jordan Whited 2025-04-16 09:07:52 -07:00 committed by GitHub
parent 25df2e86bc
commit ffc830ad9b
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1 changed files with 8 additions and 3 deletions
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11
wgengine/netstack/netstack.go
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@ -326,10 +326,15 @@ func Create(logf logger.Logf, tundev *tstun.Wrapper, e wgengine.Engine, mc *magi
if tcpipErr != nil {
return nil, fmt.Errorf("could not disable TCP RACK: %v", tcpipErr)
}
cubicOpt := tcpip.CongestionControlOption("cubic")
tcpipErr = ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &cubicOpt)
// gVisor defaults to reno at the time of writing. We explicitly set reno
// congestion control in order to prevent unexpected changes. Netstack
// has an int overflow in sender congestion window arithmetic that is more
// prone to trigger with cubic congestion control.
// See https://github.com/google/gvisor/issues/11632
renoOpt := tcpip.CongestionControlOption("reno")
tcpipErr = ipstack.SetTransportProtocolOption(tcp.ProtocolNumber, &renoOpt)
if tcpipErr != nil {
return nil, fmt.Errorf("could not set cubic congestion control: %v", tcpipErr)
return nil, fmt.Errorf("could not set reno congestion control: %v", tcpipErr)
}
err := setTCPBufSizes(ipstack)
if err != nil {