Add NetworkPolicy support (#8928)

* Add NetworkPolicy support

* add doc for np

Author: mjudeikis

charts/ingress-nginx/README.md

@@ -249,6 +249,7 @@ Kubernetes: `>=1.20.0-0`
 | controller.admissionWebhooks.key | string | `"/usr/local/certificates/key"` |  |
 | controller.admissionWebhooks.labels | object | `{}` | Labels to be added to admission webhooks |
 | controller.admissionWebhooks.namespaceSelector | object | `{}` |  |
+| controller.admissionWebhooks.networkPolicyEnabled | bool | `false` |  |
 | controller.admissionWebhooks.objectSelector | object | `{}` |  |
 | controller.admissionWebhooks.patch.enabled | bool | `true` |  |
 | controller.admissionWebhooks.patch.fsGroup | int | `2000` |  |

charts/ingress-nginx/templates/controller-wehbooks-networkpolicy.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.controller.admissionWebhooks.enabled }}
+{{- if .Values.controller.admissionWebhooks.networkPolicyEnabled }}
+
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: {{ include "ingress-nginx.fullname" . }}-webhooks-allow
+  namespace: {{ .Release.Namespace }}
+spec:
+  ingress:
+  - {}
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: {{ include "ingress-nginx.name" . }}
+  policyTypes:
+    - Ingress
+
+{{- end }}
+{{- end }}

charts/ingress-nginx/values.yaml

@@ -615,6 +615,7 @@ controller:
 
     # -- Use an existing PSP instead of creating one
     existingPsp: ""
+    networkPolicyEnabled: false
 
     service:
       annotations: {}