Enhance interface auto-detection for BPF (#9498)

felix/bpf/ut/attach_test.go

@@ -75,7 +75,7 @@ func runAttachTest(t *testing.T, ipv6Enabled bool) {
 	)
 	Expect(err).NotTo(HaveOccurred())
 
-	host1 := createVethName("hostep1")
+	host1 := createHostIf("hostep1")
 	defer deleteLink(host1)
 
 	workload0 := createVethName("workloadep0")
@@ -278,7 +278,7 @@ func runAttachTest(t *testing.T, ipv6Enabled bool) {
 		Expect(xdpProgs).To(HaveLen(0))
 	})
 
-	host2 := createVethName("hostep2")
+	host2 := createHostIf("hostep2")
 	defer deleteLink(host2)
 
 	t.Run("create another host interface without a host endpoint (no policy)", func(t *testing.T) {
@@ -848,7 +848,7 @@ func TestLogFilters(t *testing.T) {
 	)
 	Expect(err).NotTo(HaveOccurred())
 
-	host1 := createVethName("hostep1")
+	host1 := createHostIf("hostep1")
 	defer deleteLink(host1)
 
 	workload0 := createVethName("workloadep0")

felix/bpf/ut/precompilation_test.go

@@ -94,6 +94,18 @@ func createVethName(name string) netlink.Link {
 	return veth
 }
 
+func createHostIf(name string) netlink.Link {
+	la := netlink.NewLinkAttrs()
+	la.Name = name
+	la.Flags = net.FlagUp
+	var hostIf netlink.Link = &netlink.Dummy{
+		LinkAttrs: la,
+	}
+	err := netlink.LinkAdd(hostIf)
+	ExpectWithOffset(1, err).NotTo(HaveOccurred(), fmt.Sprintf("failed to create test hostIf: %q", name))
+	return hostIf
+}
+
 func deleteLink(veth netlink.Link) {
 	err := netlink.LinkDel(veth)
 	Expect(err).NotTo(HaveOccurred(), "failed to delete test veth")