Add support for Instance Alias IP Ranges

api/v1beta1/gcpmachine_types.go

@@ -217,6 +217,20 @@ type CustomerEncryptionKey struct {
 	SuppliedKey *SuppliedKey `json:"suppliedKey,omitempty"`
 }
 
+// AliasIpRange is an alias IP range attached to an instance's network interface.
+type AliasIpRange struct {
+	// 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).
+	IpCidrRange string `json:"ipCidrRange"`
+	// 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.
+	SubnetworkRangeName string `json:"subnetworkRangeName,omitempty"`
+}
+
 // GCPMachineSpec defines the desired state of GCPMachine.
 type GCPMachineSpec struct {
 	// InstanceType is the type of instance to create. Example: n1.standard-2
@@ -227,6 +241,10 @@ type GCPMachineSpec struct {
 	// +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 []AliasIpRange `json:"aliasIpRanges,omitempty"`
+
 	// ProviderID is the unique identifier as specified by the cloud provider.
 	// +optional
 	ProviderID *string `json:"providerID,omitempty"`

cloud/scope/machine.go

@@ -341,9 +341,23 @@ func (m *MachineScope) InstanceNetworkInterfaceSpec() *compute.NetworkInterface
 		networkInterface.Subnetwork = path.Join("projects", m.ClusterGetter.NetworkProject(), "regions", m.ClusterGetter.Region(), "subnetworks", *m.GCPMachine.Spec.Subnet)
 	}
 
+	networkInterface.AliasIpRanges = m.InstanceNetworkInterfaceAliasIpRangesSpec()
+
 	return networkInterface
 }
 
+func (m *MachineScope) InstanceNetworkInterfaceAliasIpRangesSpec() []*compute.AliasIpRange {
+	aliasIpRanges := make([]*compute.AliasIpRange, 0, len(m.GCPMachine.Spec.AliasIpRanges))
+	for _, alias := range m.GCPMachine.Spec.AliasIpRanges {
+		aliasIpRange := &compute.AliasIpRange{
+			IpCidrRange:         alias.IpCidrRange,
+			SubnetworkRangeName: alias.SubnetworkRangeName,
+		}
+		aliasIpRanges = append(aliasIpRanges, aliasIpRange)
+	}
+	return aliasIpRanges
+}
+
 // InstanceServiceAccountsSpec returns service-account spec.
 func (m *MachineScope) InstanceServiceAccountsSpec() *compute.ServiceAccount {
 	serviceAccount := &compute.ServiceAccount{

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

@@ -422,6 +422,28 @@ spec:
                   Subnet is a reference to the subnetwork to use for this instance. If not specified,
                   the first subnetwork retrieved from the Cluster Region and Network is picked.
                 type: string
+              aliasIpRanges:
+                description: |-
+                  AliasIpRanges let you assign ranges of internal IP addresses as aliases to a VM's network interfaces.
+                items:
+                  description: AliasIpRange defines a range to be 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)
+                      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
             required:
             - instanceType
             type: object

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

@@ -439,6 +439,28 @@ spec:
                           Subnet is a reference to the subnetwork to use for this instance. If not specified,
                           the first subnetwork retrieved from the Cluster Region and Network is picked.
                         type: string
+                      aliasIpRanges:
+                        description: |-
+                          AliasIpRanges let you assign ranges of internal IP addresses as aliases to a VM's network interfaces.
+                        items:
+                          description: AliasIpRange defines a range to be 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)
+                              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
                     required:
                     - instanceType
                     type: object