// other components about the configuration of iptables on the system.
	MakeIPTablesUtilChains bool
	// iptablesMasqueradeBit formerly controlled the creation of the KUBE-MARK-MASQ
	// chain.
	// Deprecated: no longer has any effect.
	IPTablesMasqueradeBit int32
	// iptablesDropBit formerly controlled the creation of the KUBE-MARK-DROP chain.
	// Deprecated: no longer has any effect.

	* ip-masq-agent is now on by default for GCE ([#47794](https://github.com/kubernetes/kubernetes/pull/47794), [@dnardo](https://github.com/dnardo))

         { "dst": "0.0.0.0/0" },
         { "dst": "::/0" }
       ]
     }
   },
   {
     "type": "portmap",
     "capabilities": {"portMappings": true},
     "externalSetMarkChain": "KUBE-MARK-MASQ"
   }
 ]
}
EOF
}

function install_cni_if_needed {
  echo "Checking CNI Installation at /opt/cni/bin"
  if ! command -v /opt/cni/bin/loopback &> /dev/null ; then

	"math"
	"math/bits"
)

// Mask allows filtering by a bitset mask.
type Mask uint64

const (
	// MaskAll is the mask for all entries.
	MaskAll Mask = math.MaxUint64
)

// MaskFromMaskable extracts mask from an interface.
func MaskFromMaskable(m Maskable) Mask {
	return Mask(m.Mask())
}

// Contains returns whether *all* flags in other is present in t.
func (t Mask) Contains(other Mask) bool {
	return t&other == other

* Bump ip-masq-agent to v2.1.1 ([#67916](https://github.com/kubernetes/kubernetes/pull/67916), [@MrHohn](https://github.com/MrHohn))
    * Update debian-iptables image for CVEs.
    * Change chain name to IP-MASQ to be compatible with the pre-injected masquerade rules.

- GCE clusters will include some IP ranges that are not used on the public Internet in the list of non-masq IPs. Bumped ip-masq-agent version to v2.3.0 with flag `nomasq-all-reserved-ranges` turned on. ([#77458](https://github.com/kubernetes/kubernetes/pull/77458), [@grayluck](https://github.com/grayluck))

	// the kubernetes postrouting chain
	kubePostroutingChain utiliptables.Chain = "KUBE-POSTROUTING"

	// kubeMarkMasqChain is the mark-for-masquerade chain
	kubeMarkMasqChain utiliptables.Chain = "KUBE-MARK-MASQ"

	// the kubernetes forward chain
	kubeForwardChain utiliptables.Chain = "KUBE-FORWARD"

	// kubeProxyFirewallChain is the kube-proxy firewall chain
	kubeProxyFirewallChain utiliptables.Chain = "KUBE-PROXY-FIREWALL"

    * In 1.16, the masq-agent daemonset add-on will switch to using `node.kubernetes.io/masq-agent-ds-ready` as a node selector.
* Kubelet: replace `du` and `find` with a golang implementation ([#74675](https://github.com/kubernetes/kubernetes/pull/74675), [@dashpole](https://github.com/dashpole))

- Node labels `beta.kubernetes.io/metadata-proxy-ready`, `beta.kubernetes.io/metadata-proxy-ready` and `beta.kubernetes.io/kube-proxy-ds-ready` are no longer added on new nodes.
  - ip-mask-agent addon starts to use the label `node.kubernetes.io/masq-agent-ds-ready` instead of `beta.kubernetes.io/masq-agent-ds-ready` as its node selector.

  #
  # OutBoundNAT ExceptionList: No SNAT for CIDRs in the list, the same as default GKE non-masquerade destination ranges listed at https://cloud.google.com/kubernetes-engine/docs/how-to/ip-masquerade-agent#default-non-masq-dests

  New-Item -Force -ItemType file ${l2bridge_conf} | Out-Null
  Set-Content ${l2bridge_conf} `
'{
  "cniVersion":  "0.2.0",
  "name":  "l2bridge",
  "type":  "sdnbridge",