Add support for ipv6 only cluster via "enable_ipv6only_stack_networks" (#11831)

roles/network_plugin/calico/tasks/check.yml

@@ -192,6 +192,6 @@
       - "calico_ipip_mode_ipv6 in ['Never']"
     msg: "Calico doesn't support ipip tunneling for the IPv6"
   when:
-    - enable_dual_stack_networks
+    - (enable_dual_stack_networks or enable_ipv6only_stack_networks)
   run_once: true
   delegate_to: "{{ groups['kube_control_plane'][0] }}"

roles/network_plugin/calico/tasks/install.yml

@@ -107,7 +107,7 @@
   changed_when: false
   when:
     - inventory_hostname == groups['kube_control_plane'][0]
-    - enable_dual_stack_networks
+    - (enable_dual_stack_networks or enable_ipv6only_stack_networks)
 
 - name: Calico | Ensure that calico_pool_cidr_ipv6 is within kube_pods_subnet_ipv6 when defined
   assert:
@@ -117,7 +117,7 @@
     - inventory_hostname == groups['kube_control_plane'][0]
     - calico_conf_ipv6.stdout is defined and calico_conf_ipv6.stdout == "0"
     - calico_pool_cidr_ipv6 is defined
-    - enable_dual_stack_networks
+    - (enable_dual_stack_networks or enable_ipv6only_stack_networks)
 
 - name: Calico | kdd specific configuration
   when:
@@ -256,7 +256,7 @@
 - name: Calico | Configure Calico IPv6 Pool
   when:
     - inventory_hostname == groups['kube_control_plane'][0]
-    - enable_dual_stack_networks | bool
+    - (enable_dual_stack_networks or enable_ipv6only_stack_networks) | bool
   block:
     - name: Calico | Get existing calico ipv6 network pool
       command: "{{ bin_dir }}/calicoctl.sh get ippool {{ calico_pool_name }}-ipv6 -o json"
@@ -350,7 +350,7 @@
               {% if not calico_no_global_as_num | default(false) %}"asNumber": {{ global_as_num }},{% endif %}
               "nodeToNodeMeshEnabled": {{ nodeToNodeMeshEnabled | default('true') }} ,
               {% if calico_advertise_cluster_ips | default(false) %}
-              "serviceClusterIPs": [{"cidr": "{{ kube_service_addresses }}" } {{ ',{"cidr":"' + kube_service_addresses_ipv6 + '"}' if enable_dual_stack_networks else '' }}],{% endif %}
+              "serviceClusterIPs": [{% for cidr in kube_service_addresses_range.split(",") %}{{ "," if not loop.first }}{"cidr": "{{ cidr }}"}{% endfor %}],{% endif %}
               {% if calico_advertise_service_loadbalancer_ips | length > 0  %}"serviceLoadBalancerIPs": {{ _service_loadbalancer_ips }},{% endif %}
               "serviceExternalIPs": {{ _service_external_ips | default([]) }}
             }

roles/network_plugin/calico/templates/calico-config.yml.j2

@@ -56,10 +56,14 @@ data:
             {% else %}
             "ipam": {
               "type": "calico-ipam",
-              {%   if enable_dual_stack_networks %}
+              {% if enable_ipv6only_stack_networks %}
+              "assign_ipv6": "true"
+              {% elif enable_dual_stack_networks %}
               "assign_ipv6": "true",
-              {%   endif %}
+              {% endif %}
+              {% if not enable_ipv6only_stack_networks %}
               "assign_ipv4": "true"
+              {% endif %}
             },
           {% endif %}
           {% if calico_allow_ip_forwarding %}

roles/network_plugin/calico/templates/calico-node.yml.j2

@@ -259,13 +259,15 @@ spec:
             # no effect. This should fall within `--cluster-cidr`.
             # - name: CALICO_IPV4POOL_CIDR
             #   value: "192.168.0.0/16"
+{% if not enable_ipv6only_stack_networks %}
             - name: CALICO_IPV4POOL_IPIP
               value: "{{ calico_ipv4pool_ipip }}"
+{% endif %}
             # Enable or Disable VXLAN on the default IP pool.
             - name: CALICO_IPV4POOL_VXLAN
               value: "Never"
             - name: FELIX_IPV6SUPPORT
-              value: "{{ enable_dual_stack_networks | default(false) }}"
+              value: "{{ (enable_dual_stack_networks or enable_ipv6only_stack_networks) | default(false) }}"
             # Set Felix logging to "info"
             - name: FELIX_LOGSEVERITYSCREEN
               value: "{{ calico_loglevel }}"
@@ -308,20 +310,28 @@ spec:
             - name: IP_AUTODETECTION_METHOD
               value: "can-reach=$(NODEIP)"
 {% endif %}
-            - name: IP
-              value: "autodetect"
-{% if calico_ip6_auto_method is defined and enable_dual_stack_networks %}
+{% if calico_ip6_auto_method is defined and (enable_dual_stack_networks or enable_ipv6only_stack_networks) %}
             - name: IP6_AUTODETECTION_METHOD
               value: "{{ calico_ip6_auto_method }}"
 {% endif %}
+{% if enable_ipv6only_stack_networks %}
+            - name: IP6
+              value: "autodetect"
+            - name: IP
+              value: none
+{% elif enable_dual_stack_networks %}
+            - name: IP6
+              value: "autodetect"
+            - name: IP
+              value: "autodetect"
+{% else %}
+            - name: IP
+              value: "autodetect"
+{% endif %}
 {% if calico_felix_mtu_iface_pattern is defined %}
             - name: FELIX_MTUIFACEPATTERN
               value: "{{ calico_felix_mtu_iface_pattern }}"
 {% endif %}
-{% if enable_dual_stack_networks %}
-            - name: IP6
-              value: autodetect
-{% endif %}
 {% if calico_use_default_route_src_ipaddr | default(false) %}
             - name: FELIX_DEVICEROUTESOURCEADDRESS
               valueFrom: