Chart: Rework network policies. (#10238)

charts/ingress-nginx/templates/default-backend-networkpolicy.yaml

@@ -0,0 +1,25 @@
+{{- if and .Values.defaultBackend.enabled .Values.defaultBackend.networkPolicy.enabled }}
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  labels:
+    {{- include "ingress-nginx.labels" . | nindent 4 }}
+    app.kubernetes.io/component: default-backend
+    {{- with .Values.defaultBackend.labels }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+  name: {{ include "ingress-nginx.defaultBackend.fullname" . }}
+  namespace: {{ .Release.Namespace }}
+spec:
+  podSelector:
+    matchLabels:
+      {{- include "ingress-nginx.selectorLabels" . | nindent 6 }}
+      app.kubernetes.io/component: default-backend
+  policyTypes:
+    - Ingress
+    - Egress
+  ingress:
+    - ports:
+        - protocol: TCP
+          port: {{ .Values.defaultBackend.port }}
+{{- end }}