Adds CreateNetworkStatuses for CNI results with multiple pod interfaces

pkg/utils/net-attach-def.go

@@ -122,6 +122,67 @@ func GetNetworkStatus(pod *corev1.Pod) ([]v1.NetworkStatus, error) {
 	return netStatuses, err
 }
 
+// CreateNetworkStatuses creates an array of NetworkStatus from CNI result
+// Not to be confused with CreateNetworkStatus (singular)
+// This is the preferred method and picks up when CNI ADD results contain multiple container interfaces
+func CreateNetworkStatuses(r cnitypes.Result, networkName string, defaultNetwork bool, dev *v1.DeviceInfo) ([]*v1.NetworkStatus, error) {
+	var networkStatuses []*v1.NetworkStatus
+	// indexMap is from original CNI result index to networkStatuses index
+	indexMap := make(map[int]int)
+
+	// Convert whatever the IPAM result was into the current Result type
+	result, err := cni100.NewResultFromResult(r)
+	if err != nil {
+		return nil, fmt.Errorf("error converting the type.Result to cni100.Result: %v", err)
+	}
+
+	// Discover default routes upfront and reuse them if necessary.
+	var useDefaultRoute []string
+	for _, route := range result.Routes {
+		if isDefaultRoute(route) {
+			useDefaultRoute = append(useDefaultRoute, route.GW.String())
+		}
+	}
+
+	// Same for DNS
+	v1dns := convertDNS(result.DNS)
+
+	// Initialize NetworkStatus for each container interface (e.g. with sandbox present)
+	indexOfFoundPodInterface := 0
+	for i, iface := range result.Interfaces {
+		if iface.Sandbox != "" {
+			ns := &v1.NetworkStatus{
+				Name:       networkName,
+				Default:    defaultNetwork,
+				Interface:  iface.Name,
+				Mac:        iface.Mac,
+				Mtu:        iface.Mtu,
+				IPs:        []string{},
+				Gateway:    useDefaultRoute,
+				DeviceInfo: dev,
+				DNS:        *v1dns,
+			}
+			networkStatuses = append(networkStatuses, ns)
+			// Map original index to the new slice index
+			indexMap[i] = indexOfFoundPodInterface
+			indexOfFoundPodInterface++
+		}
+	}
+
+	// Map IPs to network interface based on index
+	for _, ipConfig := range result.IPs {
+		if ipConfig.Interface != nil {
+			originalIndex := *ipConfig.Interface
+			if newIndex, ok := indexMap[originalIndex]; ok {
+				ns := networkStatuses[newIndex]
+				ns.IPs = append(ns.IPs, ipConfig.Address.IP.String())
+			}
+		}
+	}
+
+	return networkStatuses, nil
+}
+
 // CreateNetworkStatus create NetworkStatus from CNI result
 func CreateNetworkStatus(r cnitypes.Result, networkName string, defaultNetwork bool, dev *v1.DeviceInfo) (*v1.NetworkStatus, error) {
 	netStatus := &v1.NetworkStatus{}

pkg/utils/net-attach-def_test.go

@@ -224,6 +224,79 @@ var _ = Describe("Netwok Attachment Definition manipulations", func() {
 		})
 	})
 
+	Context("create network statuses from CNI result with multiple interfaces", func() {
+		var cniResult *cni100.Result
+		var networkStatuses []*v1.NetworkStatus
+
+		BeforeEach(func() {
+			cniResult = &cni100.Result{
+				CNIVersion: "1.1.0",
+				Interfaces: []*cni100.Interface{
+					{
+						Name:    "example0",
+						Mac:     "00:AA:BB:CC:DD:01",
+						Sandbox: "/path/to/network/namespace",
+						Mtu:     1500,
+					},
+					{
+						Name: "foo",
+						Mac:  "00:AA:BB:CC:DD:33",
+					},
+					{
+						Name:    "example1",
+						Mac:     "00:AA:BB:CC:DD:02",
+						Sandbox: "/path/to/network/namespace",
+						Mtu:     1500,
+					},
+				},
+				IPs: []*cni100.IPConfig{
+					{
+						Address:   *EnsureCIDR("192.0.2.1/24"),
+						Interface: &[]int{0}[0],
+					},
+					{
+						Address:   *EnsureCIDR("192.0.2.2/24"),
+						Interface: &[]int{0}[0],
+					},
+					{
+						Address:   *EnsureCIDR("192.0.2.3/24"),
+						Interface: &[]int{2}[0],
+					},
+				},
+				DNS: cnitypes.DNS{
+					Nameservers: []string{"8.8.8.8", "8.8.4.4"},
+					Search:      []string{"example.com"},
+					Options:     []string{"ndots:2"},
+				},
+			}
+			var err error
+			networkStatuses, err = CreateNetworkStatuses(cniResult, "test-multi-net-attach-def", false, nil)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("creates network statuses for interfaces with sandbox", func() {
+			Expect(networkStatuses).To(HaveLen(2))
+			// Check details for the first returned network status
+			Expect(networkStatuses[0].Name).To(Equal("test-multi-net-attach-def"))
+			Expect(networkStatuses[0].Interface).To(Equal("example0"))
+			Expect(networkStatuses[0].Mtu).To(Equal(1500))
+			Expect(networkStatuses[0].Mac).To(Equal("00:AA:BB:CC:DD:01"))
+			Expect(networkStatuses[0].IPs).To(ConsistOf("192.0.2.1", "192.0.2.2"))
+
+			// Check details for the second returned network status
+			Expect(networkStatuses[1].Interface).To(Equal("example1"))
+			Expect(networkStatuses[1].Mtu).To(Equal(1500))
+			Expect(networkStatuses[1].Mac).To(Equal("00:AA:BB:CC:DD:02"))
+			Expect(networkStatuses[1].IPs).To(ConsistOf("192.0.2.3"))
+		})
+
+		It("excludes interfaces without a sandbox", func() {
+			for _, status := range networkStatuses {
+				Expect(status.Interface).NotTo(Equal("foo"))
+			}
+		})
+	})
+
 	It("parse network selection element in pod", func() {
 		selectionElement := `
 		[{