[IPAM] Optimize IP API and gRPC interface

apis/ipam/v1alpha1/ip_types.go

@@ -49,6 +49,10 @@ type IPSpec struct {
 	// IP is the local IP.
 	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="IP field is immutable"
 	IP networkingv1beta1.IP `json:"ip"`
+	// CIDR is the network CIDR where the desired IP should be allocated from.
+	// It is optional, if left empty the IP will be allocated in a default network CIDR (e.g., external CIDR).
+	// +kubebuilder:validation:Optional
+	CIDR *networkingv1beta1.CIDR `json:"cidr,omitempty"`
 	// ServiceTemplate contains the template to create the associated service (and endpointslice) for the IP endopoint.
 	// If empty the creation of the service is disabled (default).
 	// +kubebuilder:validation:Optional

deployments/liqo/charts/liqo-crds/crds/ipam.liqo.io_ips.yaml

@@ -52,6 +52,12 @@ spec:
           spec:
             description: IPSpec defines a local IP.
             properties:
+              cidr:
+                description: |-
+                  CIDR is the network CIDR where the desired IP should be allocated from.
+                  It is optional, if left empty the IP will be allocated in a default network CIDR (e.g., external CIDR).
+                format: cidr
+                type: string
               ip:
                 description: IP is the local IP.
                 format: ipv4

pkg/ipam/ipam.proto

@@ -16,8 +16,7 @@ message ResponseResult {
 }
 
 message IPAcquireRequest {
-    string ip = 1;
-    string cidr = 2;
+    string cidr = 1;
 }
 
 message IPAcquireResponse {