Adding the ability to enable dual stacks.

Subnets are one of the resources that control the ability to use a dual stack (IPV4
and IPV6). These are required to be set on resource creation, and they cannot be
altered post creation.

The user has the option to set the stack type for each subnet (IPV4_ONLY, IPV4_IPV6, or
IPV6_ONLY). The default will be IPV4_ONLY.

Author: barbacbd

api/v1beta1/types.go

@@ -240,6 +240,22 @@ type SubnetSpec struct {
 	// +kubebuilder:default=PRIVATE_RFC_1918
 	// +optional
 	Purpose *string `json:"purpose,omitempty"`
+
+	// StackType: The stack type for the subnet. If set to IPV4_ONLY, new VMs in
+	// the subnet are assigned IPv4 addresses only. If set to IPV4_IPV6, new VMs in
+	// the subnet can be assigned both IPv4 and IPv6 addresses. If not specified,
+	// IPV4_ONLY is used. This field can be both set at resource creation time and
+	// updated using patch.
+	//
+	// Possible values:
+	//   "IPV4_IPV6" - New VMs in this subnet can have both IPv4 and IPv6
+	// addresses.
+	//   "IPV4_ONLY" - New VMs in this subnet will only be assigned IPv4 addresses.
+	//   "IPV6_ONLY" - New VMs in this subnet will only be assigned IPv6 addresses.
+	// +kubebuilder:validation:Enum=IPV4_ONLY;IPV4_IPV6;IPV6_ONLY
+	// +kubebuilder:default=IPV4_ONLY
+	// +optional
+	StackType string `json:"stackType,omitempty"`
 }
 
 // String returns a string representation of the subnet.

config/crd/bases/infrastructure.cluster.x-k8s.io_gcpclusters.yaml

@@ -248,6 +248,25 @@ spec:
                             SecondaryCidrBlocks defines secondary CIDR ranges,
                             from which secondary IP ranges of a VM may be allocated
                           type: object
+                        stackType:
+                          default: IPV4_ONLY
+                          description: |-
+                            StackType: The stack type for the subnet. If set to IPV4_ONLY, new VMs in
+                            the subnet are assigned IPv4 addresses only. If set to IPV4_IPV6, new VMs in
+                            the subnet can be assigned both IPv4 and IPv6 addresses. If not specified,
+                            IPV4_ONLY is used. This field can be both set at resource creation time and
+                            updated using patch.
+
+                            Possible values:
+                              "IPV4_IPV6" - New VMs in this subnet can have both IPv4 and IPv6
+                            addresses.
+                              "IPV4_ONLY" - New VMs in this subnet will only be assigned IPv4 addresses.
+                              "IPV6_ONLY" - New VMs in this subnet will only be assigned IPv6 addresses.
+                          enum:
+                          - IPV4_ONLY
+                          - IPV4_IPV6
+                          - IPV6_ONLY
+                          type: string
                       type: object
                     type: array
                 type: object

config/crd/bases/infrastructure.cluster.x-k8s.io_gcpclustertemplates.yaml

@@ -265,6 +265,25 @@ spec:
                                     SecondaryCidrBlocks defines secondary CIDR ranges,
                                     from which secondary IP ranges of a VM may be allocated
                                   type: object
+                                stackType:
+                                  default: IPV4_ONLY
+                                  description: |-
+                                    StackType: The stack type for the subnet. If set to IPV4_ONLY, new VMs in
+                                    the subnet are assigned IPv4 addresses only. If set to IPV4_IPV6, new VMs in
+                                    the subnet can be assigned both IPv4 and IPv6 addresses. If not specified,
+                                    IPV4_ONLY is used. This field can be both set at resource creation time and
+                                    updated using patch.
+
+                                    Possible values:
+                                      "IPV4_IPV6" - New VMs in this subnet can have both IPv4 and IPv6
+                                    addresses.
+                                      "IPV4_ONLY" - New VMs in this subnet will only be assigned IPv4 addresses.
+                                      "IPV6_ONLY" - New VMs in this subnet will only be assigned IPv6 addresses.
+                                  enum:
+                                  - IPV4_ONLY
+                                  - IPV4_IPV6
+                                  - IPV6_ONLY
+                                  type: string
                               type: object
                             type: array
                         type: object

config/crd/bases/infrastructure.cluster.x-k8s.io_gcpmanagedclusters.yaml

@@ -244,6 +244,25 @@ spec:
                             SecondaryCidrBlocks defines secondary CIDR ranges,
                             from which secondary IP ranges of a VM may be allocated
                           type: object
+                        stackType:
+                          default: IPV4_ONLY
+                          description: |-
+                            StackType: The stack type for the subnet. If set to IPV4_ONLY, new VMs in
+                            the subnet are assigned IPv4 addresses only. If set to IPV4_IPV6, new VMs in
+                            the subnet can be assigned both IPv4 and IPv6 addresses. If not specified,
+                            IPV4_ONLY is used. This field can be both set at resource creation time and
+                            updated using patch.
+
+                            Possible values:
+                              "IPV4_IPV6" - New VMs in this subnet can have both IPv4 and IPv6
+                            addresses.
+                              "IPV4_ONLY" - New VMs in this subnet will only be assigned IPv4 addresses.
+                              "IPV6_ONLY" - New VMs in this subnet will only be assigned IPv6 addresses.
+                          enum:
+                          - IPV4_ONLY
+                          - IPV4_IPV6
+                          - IPV6_ONLY
+                          type: string
                       type: object
                     type: array
                 type: object