test: Populate world CIDR map in high-scale ipcache test

Now that the datapath encapsulation and decapsulation are implemented,
the end-to-end test will fail. To decide whether we should encapsulate
or not, we lookup the world CIDR map. If no match is found, we
encapsulate. That means that we will currently always encapsulate (even
when e.g. resolving a domain name from 8.8.8.8) because the world CIDR
map is not currently populated.

The world CIDR map will be populate once the patchset introducing the
new CRD is merged. Until then, we can add a catch-all 0.0.0.0/0 entry to
not encapsulate anything. This commit can be reverted once the
CiliumWorldCIDRSet CRD is merged.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>

test/k8s/datapath_configuration.go

@@ -15,12 +15,16 @@ import (
 
 	. "github.com/onsi/gomega"
 
+	"github.com/cilium/cilium/pkg/defaults"
 	"github.com/cilium/cilium/test/config"
 	. "github.com/cilium/cilium/test/ginkgo-ext"
 	"github.com/cilium/cilium/test/helpers"
 )
 
 var _ = Describe("K8sDatapathConfig", func() {
+	const (
+		bpffsDir string = defaults.BPFFSRoot + "/" + defaults.TCGlobalsPath + "/"
+	)
 
 	var (
 		kubectl    *helpers.Kubectl
@@ -492,6 +496,9 @@ var _ = Describe("K8sDatapathConfig", func() {
 			}
 			deploymentManager.DeployCilium(options, DeployCiliumOptionsAndDNS)
 
+			cmd := fmt.Sprintf("bpftool map update pinned %scilium_world_cidrs4 key 0 0 0 0 0 0 0 0 value 1", bpffsDir)
+			kubectl.CiliumExecMustSucceedOnAll(context.TODO(), cmd)
+
 			hsIPcacheYAML := helpers.ManifestGet(kubectl.BasePath(), hsIPcacheFile)
 			kubectl.Create(hsIPcacheYAML).ExpectSuccess("Unable to create resource %q", hsIPcacheYAML)