INNER CODE UNIT · Go

configureSystemParams

aws/amazon-vpc-cni-k8s · cmd/aws-vpc-cni-init/main.go:70

func configureSystemParams(procSys procsyswrapper.ProcSys, primaryIF string) error {
	var err error
	// Configure rp_filter in loose mode
	entry := "net/ipv4/conf/" + primaryIF + "/rp_filter"
	err = procSys.Set(entry, "2")
	if err != nil {
		return errors.Wrapf(err, "Failed to set rp_filter for %s", primaryIF)
	}
	val, _ := procSys.Get(entry)
	log.Infof("Updated %s to %s", entry, val)

	// Enable or disable TCP early demux based on environment variable
	// Note that older kernels may not support tcp_early_demux, so we must first check that it exists.
	entry = "net/ipv4/tcp_early_demux"
	if _, err := procSys.Get(entry); err == nil {
		disableIPv4EarlyDemux := utils.GetBoolAsStringEnvVar(envDisableIPv4TcpEarlyDemux, defaultDisableIPv4TcpEarlyDemux)
		if disableIPv4EarlyDemux {
			err = procSys.Set(entry, "0")

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