repeated string audiences = 4;

  // Error indicates that the token couldn't be checked
  // +optional
  optional string error = 3;
}

// UserInfo holds the information about the user needed to implement the
// user.Info interface.
message UserInfo {
  // The name that uniquely identifies this user among all active users.
  // +optional
  optional string username = 1;

    - if ambient is enabled, also runs an ambient controller, watching Pod, Namespace

- `istio-cni`
    - CNI plugin executable copied to `/opt/cni/bin`
    - currently implemented for k8s only
    - on pod add, determines whether pod should have netns setup to redirect to Istio proxy. See [cmdAdd](#cmdadd-workflow) for detailed logic.

This document provides an overview of the architecture and design decisions around Ztunnel, the node-proxy component in ambient mode.

## Background and motivation

Motivations to implement ztunnel generally came from two areas.

First, and most importantly, it serves as a means to implement the real goal: waypoints.
For various reasons outside the scope of this document, there is a desire to move from a sidecar based architecture to a "remote proxy" architecture.

	return errors.New("not implemented on this platform")
}

func DelInpodMarkIPRule(cfg *Config) error {
	return errors.New("not implemented on this platform")
}

func AddLoopbackRoutes(cfg *Config) error {
	return errors.New("not implemented on this platform")
}

func DelLoopbackRoutes(cfg *Config) error {
	return errors.New("not implemented on this platform")

  // Non-standard protocols should use prefixed names such as
  // mycompany.com/my-custom-protocol.
  // +optional
  optional string appProtocol = 4;
}

// EndpointSlice represents a subset of the endpoints that implement a service.
// For a given service there may be multiple EndpointSlice objects, selected by
// labels, which must be joined to produce the full set of endpoints.
message EndpointSlice {
  // Standard object's metadata.

  // SideEffects states whether this webhook has side effects.
  // Acceptable values are: None, NoneOnDryRun (webhooks created via v1beta1 may also specify Some or Unknown).
  // Webhooks with side effects MUST implement a reconciliation system, since a request may be
  // rejected by a future step in the admission chain and the side effects therefore need to be undone.

## PeerAuthentication and the Waypoint Proxy

(Note: this section is not yet implemented and is dependent upon discussion in the [ztunnel hairpinning doc](https://docs.google.com/document/d/1uM1c3zzoehiijh1ZpZuJ1-SzuVVupenv8r5yuCaFshs/edit#heading=h.dwbqvwmg6ud3))

	data, err := readFile(filename)
	if err != nil {
		return nil, err
	}
	return setupClustersEnvoyConfigWriter(data, out)
}

// TODO(fisherxu): migrate this to config dump when implemented in Envoy
// Issue to track -> https://github.com/envoyproxy/envoy/issues/3362
func setupClustersEnvoyConfigWriter(debug []byte, out io.Writer) (*clusters.ConfigWriter, error) {
	cw := &clusters.ConfigWriter{Stdout: out}

  // SideEffects states whether this webhook has side effects.
  // Acceptable values are: Unknown, None, Some, NoneOnDryRun
  // Webhooks with side effects MUST implement a reconciliation system, since a request may be
  // rejected by a future step in the admission chain and the side effects therefore need to be undone.

// IngressSpec describes the Ingress the user wishes to exist.
message IngressSpec {
  // ingressClassName is the name of the IngressClass cluster resource. The
  // associated IngressClass defines which controller will implement the
  // resource. This replaces the deprecated `kubernetes.io/ingress.class`
  // annotation. For backwards compatibility, when that annotation is set, it
  // must be given precedence over this field. The controller may emit a