Support pod native routing in MachinePool

cloud/scope/machinepool.go

@@ -342,8 +342,7 @@ func (m *MachinePoolScope) InstanceTemplateResource(ctx context.Context) (*compu
 	instance.Disks = append(instance.Disks, m.InstanceAdditionalDiskSpec()...)
 	instance.Metadata = InstanceAdditionalMetadataSpec(m.GCPMachinePool.Spec.AdditionalMetadata)
 	instance.ServiceAccounts = append(instance.ServiceAccounts, instanceServiceAccountsSpec(m.GCPMachinePool.Spec.ServiceAccount))
-	var aliasIPRanges []infrav1.AliasIPRange // Not supported by MachinePool
-	instance.NetworkInterfaces = append(instance.NetworkInterfaces, InstanceNetworkInterfaceSpec(m.ClusterGetter, m.GCPMachinePool.Spec.PublicIP, m.GCPMachinePool.Spec.Subnet, aliasIPRanges))
+	instance.NetworkInterfaces = append(instance.NetworkInterfaces, InstanceNetworkInterfaceSpec(m.ClusterGetter, m.GCPMachinePool.Spec.PublicIP, m.GCPMachinePool.Spec.Subnet, m.GCPMachinePool.Spec.AliasIPRanges))
 	instance.GuestAccelerators = instanceGuestAcceleratorsSpec(m.GCPMachinePool.Spec.GuestAccelerators)
 	if len(instance.GuestAccelerators) > 0 {
 		instance.Scheduling.OnHostMaintenance = onHostMaintenanceTerminate

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

@@ -181,6 +181,32 @@ spec:
                 items:
                   type: string
                 type: array
+              aliasIPRanges:
+                description: AliasIPRanges let you assign ranges of internal IP addresses
+                  as aliases to a VM's network interfaces.
+                items:
+                  description: AliasIPRange is an alias IP range attached to an instance's
+                    network interface.
+                  properties:
+                    ipCidrRange:
+                      description: |-
+                        IPCidrRange is the IP alias ranges to allocate for this interface. This IP
+                        CIDR range must belong to the specified subnetwork and cannot contain IP
+                        addresses reserved by system or used by other network interfaces. This range
+                        may be a single IP address (such as 10.2.3.4), a netmask (such as /24) or a
+                        CIDR-formatted string (such as 10.1.2.0/24).
+                      pattern: ^((([0-9]|[0-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[0-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])/([0-9]|[12][0-9]|3[0-2])|(([0-9]|[0-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[0-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])|(/([0-9]|[12][0-9]|3[0-2])))$
+                      type: string
+                    subnetworkRangeName:
+                      description: |-
+                        SubnetworkRangeName is the name of a subnetwork secondary IP range from which
+                        to allocate an IP alias range. If not specified, the primary range of the
+                        subnetwork is used.
+                      type: string
+                  required:
+                  - ipCidrRange
+                  type: object
+                type: array
               confidentialCompute:
                 description: |-
                   ConfidentialCompute Defines whether the instance should have confidential compute enabled or not, and the confidential computing technology of choice.

exp/api/v1beta1/gcpmachinepool_types.go

@@ -20,8 +20,9 @@
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
 	capg "sigs.k8s.io/cluster-api-provider-gcp/api/v1beta1"
 	"sigs.k8s.io/cluster-api/util/conditions"
+	infrav1 "sigs.k8s.io/cluster-api-provider-gcp/api/v1beta1"
 )
 
 // Constants block.
@@ -45,6 +46,10 @@
 	// +optional
 	Subnet *string `json:"subnet,omitempty"`
 
+	// AliasIPRanges let you assign ranges of internal IP addresses as aliases to a VM's network interfaces.
+	// +optional
+	AliasIPRanges []infrav1.AliasIPRange `json:"aliasIPRanges,omitempty"`
+
 	// ImageFamily is the full reference to a valid image family to be used for this machine.
 	// +optional
 	ImageFamily *string `json:"imageFamily,omitempty"`