### Design details

Broadly, `istio-cni` accomplishes ambient redirection by instructing ztunnel to set up sockets within the application pod network namespace, where:

- one end of the socket is in the application pod
- and the other end is in ztunnel's pod

and setting up iptables rules to funnel traffic thru that socket "tube" to ztunnel and back.

iptables -t nat -N ISTIO_POSTRT
iptables -t nat -A POSTROUTING -j ISTIO_POSTRT

	// The HTTP port for monitoring
	MonitoringPort int

	// The UDS server address that CNI plugin will send log to.
	LogUDSAddress string

	// The watch server socket address that CNI plugin will forward CNI events to.
	CNIEventAddress string

	// The ztunnel server socket address that the ztunnel will connect to.
	ZtunnelUDSAddress string

	// Whether ambient is enabled
	AmbientEnabled bool

    resources:
  {{ template "resources" . }}
    volumeMounts:
    - name: workload-socket
      mountPath: /var/run/secrets/workload-spiffe-uds
    {{- if eq .Values.global.caName "GkeWorkloadCertificate" }}
    - name: gke-workload-certificate
      mountPath: /var/run/secrets/workload-spiffe-credentials

                                  type: integer
                                tcpKeepalive:
                                  description: If set then set SO_KEEPALIVE on the
                                    socket to enable TCP Keepalives.
                                  properties:
                                    interval:
                                      description: The time duration between keep-alive

iptables -t nat -N ISTIO_POSTRT
iptables -t nat -A POSTROUTING -j ISTIO_POSTRT
iptables -t nat -A ISTIO_POSTRT -m owner --socket-exists -p tcp -m set --match-set istio-inpod-probes-v4 dst -j SNAT --to-source 169.254.7.127
ip6tables -t nat -N ISTIO_POSTRT
ip6tables -t nat -A POSTROUTING -j ISTIO_POSTRT

            valueFrom:
              fieldRef:
                fieldPath: spec.nodeName
          volumeMounts:
          - name: workload-socket
            mountPath: /var/run/secrets/workload-spiffe-uds
          - name: credential-socket
            mountPath: /var/run/secrets/credential-uds
          - name: workload-certs
            mountPath: /var/run/secrets/workload-spiffe-credentials

          initialDelaySeconds: 0
          periodSeconds: 15
          successThreshold: 1
          timeoutSeconds: 1
        volumeMounts:
        - name: workload-socket
          mountPath: /var/run/secrets/workload-spiffe-uds
        - name: credential-socket
          mountPath: /var/run/secrets/credential-uds
        {{- if eq .Values.global.caName "GkeWorkloadCertificate" }}
        - name: gke-workload-certificate

          privileged: false
          runAsGroup: 1337
          runAsUser: 0
          capabilities:
            drop:
            - ALL
        volumeMounts:
        - name: workload-socket
          mountPath: /var/run/secrets/workload-spiffe-uds
        - mountPath: /var/run/secrets/istio
          name: istiod-ca-cert
        - mountPath: /var/lib/istio/data
          name: istio-data

                                  type: integer
                                tcpKeepalive:
                                  description: If set then set SO_KEEPALIVE on the
                                    socket to enable TCP Keepalives.
                                  properties:
                                    interval:
                                      description: The time duration between keep-alive