Add function to check for OCP IPv6 cluster network

The RabbitMQ config differs for IPv6 so add a function to determine if
IPv6 is enabled on the OCP cluster network, similar to the FIPS mode check

modules/common/ocp/ocp.go

@@ -18,6 +18,7 @@ package ocp
 
 import (
 	"context"
+	"strings"
 
 	"github.com/openstack-k8s-operators/lib-common/modules/common/helper"
 
@@ -26,17 +27,25 @@ import (
 	"k8s.io/apimachinery/pkg/types"
 )
 
-// IsFipsCluster - Check if OCP has fips enabled which is a day 1 operation
-func IsFipsCluster(ctx context.Context, h *helper.Helper) (bool, error) {
+func getInstallConfig(ctx context.Context, h *helper.Helper) (map[string]interface{}, error) {
+	var installConfig map[string]interface{}
 	configMap := &corev1.ConfigMap{}
 	err := h.GetClient().Get(ctx, types.NamespacedName{Name: "cluster-config-v1", Namespace: "kube-system"}, configMap)
 	if err != nil {
-		return false, err
+		return installConfig, err
 	}
 
-	var installConfig map[string]interface{}
 	installConfigYAML := configMap.Data["install-config"]
 	err = yaml.Unmarshal([]byte(installConfigYAML), &installConfig)
+	if err != nil {
+		return installConfig, err
+	}
+	return installConfig, nil
+}
+
+// IsFipsCluster - Check if OCP has fips enabled which is a day 1 operation
+func IsFipsCluster(ctx context.Context, h *helper.Helper) (bool, error) {
+	installConfig, err := getInstallConfig(ctx, h)
 	if err != nil {
 		return false, err
 	}
@@ -47,3 +56,29 @@ func IsFipsCluster(ctx context.Context, h *helper.Helper) (bool, error) {
 	}
 	return fipsEnabled, nil
 }
+
+// HasIPv6ClusterNetwork - Check if OCP has an IPv6 cluster network
+func HasIPv6ClusterNetwork(ctx context.Context, h *helper.Helper) (bool, error) {
+	installConfig, err := getInstallConfig(ctx, h)
+	if err != nil {
+		return false, err
+	}
+
+	networking, ok := installConfig["networking"].(map[string]interface{})
+	if !ok {
+		return false, nil
+	}
+	clusterNetworks, ok := networking["clusterNetwork"].([]map[string]interface{})
+	if !ok {
+		return false, nil
+	}
+	for _, clusterNetwork := range clusterNetworks {
+		cidr, ok := clusterNetwork["cidr"].(string)
+		if ok {
+			if strings.Count(cidr, ":") >= 2 {
+				return true, nil
+			}
+		}
+	}
+	return false, nil
+}