Harshavardhana <******@****.***> 1703206615 -0800

  # If "TPROXY", use iptables TPROXY to redirect to Envoy.
  # The "TPROXY" mode preserves both the source and destination IP
  # addresses and ports, so that they can be used for advanced filtering
  # and manipulation.
  # The "TPROXY" mode also configures the sidecar to run with the
  # CAP_NET_ADMIN capability, which is required to use TPROXY.
  #interceptionMode: REDIRECT
  #

		"-p", iptablesconstants.TCP,
		"-i", "lo",
		"-j", "ACCEPT")

	// CLI: -A ISTIO_PRERT -p tcp -m tcp --dport <INPORT> -m mark ! --mark 0x539/0xfff -j TPROXY --on-port <INPORT> --on-ip 127.0.0.1 --tproxy-mark 0x111/0xfff
	//
	// DESC: Anything heading to <INPORT> that does not have the mark, TPROXY to ztunnel inbound port <INPORT>
	iptablesBuilder.AppendRule(
		iptableslog.UndefinedCommand, ChainInpodPrerouting, iptablesconstants.MANGLE,

      readOnlyRootFilesystem: {{ ne (annotation .ObjectMeta `sidecar.istio.io/enableCoreDump` .Values.global.proxy.enableCoreDump) "true" }}
      runAsGroup: {{ .ProxyGID | default "1337" }}
      {{ if or (eq (annotation .ObjectMeta `sidecar.istio.io/interceptionMode` .ProxyConfig.InterceptionMode) `TPROXY`) (eq (annotation .ObjectMeta `sidecar.istio.io/capNetBindService` .Values.global.proxy.capNetBindService) `true`) -}}

      readOnlyRootFilesystem: {{ ne (annotation .ObjectMeta `sidecar.istio.io/enableCoreDump` .Values.global.proxy.enableCoreDump) "true" }}
      runAsGroup: {{ .ProxyGID | default "1337" }}
      {{ if or (eq (annotation .ObjectMeta `sidecar.istio.io/interceptionMode` .ProxyConfig.InterceptionMode) `TPROXY`) (eq (annotation .ObjectMeta `sidecar.istio.io/capNetBindService` .Values.global.proxy.capNetBindService) `true`) -}}

# Values set by 'go env -w' and written to the user's go/env file override these.
# The environment overrides everything else.

# Use the Go module mirror and checksum database by default.
# See https://proxy.golang.org for details.
GOPROXY=https://proxy.golang.org,direct
GOSUMDB=sum.golang.org

# Automatically download newer toolchains as directed by go.mod files.
# See https://go.dev/doc/toolchain for details.

    }

    private static Proxy toProxy(org.apache.maven.repository.Proxy proxy) {
        Proxy result = null;
        if (proxy != null) {
            AuthenticationBuilder authBuilder = new AuthenticationBuilder();
            authBuilder.addUsername(proxy.getUserName()).addPassword(proxy.getPassword());
            result = new Proxy(proxy.getProtocol(), proxy.getHost(), proxy.getPort(), authBuilder.build());
        }

		},
		{
			name: "tproxy",
			annotations: map[string]string{
				annotation.SidecarStatus.Name:           "true",
				annotation.SidecarInterceptionMode.Name: redirectModeTPROXY,
			},
			proxyEnv: []corev1.EnvVar{},
			golden:   filepath.Join(env.IstioSrc, "cni/pkg/plugin/testdata/tproxy.txt.golden"),
		},
		{
			name:        "DNS",

            - ALL
            add: # See https://man7.org/linux/man-pages/man7/capabilities.7.html
            - NET_ADMIN # Required for TPROXY and setsockopt
            - SYS_ADMIN # Required for `setns` - doing things in other netns
            - NET_RAW # Required for RAW/PACKET sockets, TPROXY
          readOnlyRootFilesystem: true
          runAsGroup: 1337
          runAsNonRoot: false
          runAsUser: 0

Harshavardhana <******@****.***> 1703206615 -0800