Add ignored interfaces names when getting interface by IP

cmd/antrea-agent/agent.go

@@ -305,14 +305,6 @@ func run(o *Options) error {
 	}
 
 	var egressController *egress.EgressController
-	var nodeTransportIP net.IP
-	if nodeConfig.NodeTransportIPv4Addr != nil {
-		nodeTransportIP = nodeConfig.NodeTransportIPv4Addr.IP
-	} else if nodeConfig.NodeTransportIPv6Addr != nil {
-		nodeTransportIP = nodeConfig.NodeTransportIPv6Addr.IP
-	} else {
-		return fmt.Errorf("invalid Node Transport IPAddr in Node config: %v", nodeConfig)
-	}
 
 	var externalIPPoolController *externalippool.ExternalIPPoolController
 	var externalIPController *serviceexternalip.ServiceExternalIPController
@@ -324,7 +316,14 @@ func run(o *Options) error {
 			crdClient, externalIPPoolInformer,
 		)
 		localIPDetector = ipassigner.NewLocalIPDetector()
-
+		var nodeTransportIP net.IP
+		if nodeConfig.NodeTransportIPv4Addr != nil {
+			nodeTransportIP = nodeConfig.NodeTransportIPv4Addr.IP
+		} else if nodeConfig.NodeTransportIPv6Addr != nil {
+			nodeTransportIP = nodeConfig.NodeTransportIPv6Addr.IP
+		} else {
+			return fmt.Errorf("invalid Node Transport IPAddr in Node config: %v", nodeConfig)
+		}
 		memberlistCluster, err = memberlist.NewCluster(nodeTransportIP, o.config.ClusterMembershipPort,
 			nodeConfig.Name, nodeInformer, externalIPPoolInformer,
 		)
@@ -334,7 +333,7 @@ func run(o *Options) error {
 	}
 	if features.DefaultFeatureGate.Enabled(features.Egress) {
 		egressController, err = egress.NewEgressController(
-			ofClient, antreaClientProvider, crdClient, ifaceStore, routeClient, nodeConfig.Name, nodeTransportIP,
+			ofClient, antreaClientProvider, crdClient, ifaceStore, routeClient, nodeConfig.Name, nodeConfig.NodeTransportInterfaceName,
 			memberlistCluster, egressInformer, nodeInformer, localIPDetector,
 		)
 		if err != nil {
@@ -344,7 +343,7 @@ func run(o *Options) error {
 	if features.DefaultFeatureGate.Enabled(features.ServiceExternalIP) {
 		externalIPController, err = serviceexternalip.NewServiceExternalIPController(
 			nodeConfig.Name,
-			nodeTransportIP,
+			nodeConfig.NodeTransportInterfaceName,
 			k8sClient,
 			memberlistCluster,
 			serviceInformer,

pkg/agent/agent.go

@@ -28,6 +28,7 @@ import (
 	"github.com/containernetworking/plugins/pkg/ip"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	apitypes "k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 	clientset "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/util/retry"
@@ -47,6 +48,7 @@ import (
 	"antrea.io/antrea/pkg/ovs/ovsconfig"
 	"antrea.io/antrea/pkg/ovs/ovsctl"
 	"antrea.io/antrea/pkg/util/env"
+	utilip "antrea.io/antrea/pkg/util/ip"
 	"antrea.io/antrea/pkg/util/k8s"
 )
 
@@ -796,7 +798,7 @@ func (i *Initializer) initNodeLocalConfig() error {
 	if err != nil {
 		return fmt.Errorf("failed to obtain local IP addresses from K8s: %w", err)
 	}
-	nodeIPv4Addr, nodeIPv6Addr, nodeInterface, err = getIPNetDeviceFromIP(ipAddrs)
+	nodeIPv4Addr, nodeIPv6Addr, nodeInterface, err = i.getNodeInterfaceFromIP(ipAddrs)
 	if err != nil {
 		return fmt.Errorf("failed to get local IPNet device with IP %v: %v", ipAddrs, err)
 	}
@@ -1117,3 +1119,10 @@ func (i *Initializer) patchNodeAnnotations(nodeName, key string, value interface
 	}
 	return nil
 }
+
+// getNodeInterfaceFromIP returns the IPv4/IPv6 configuration, and the associated interface according the give nodeIPs.
+// When searching the Node interface, antrea-gw0 is ignored because it is configured with the same address as Node IP
+// with NetworkPolicyOnly mode on public cloud setup, e.g., AKS.
+func (i *Initializer) getNodeInterfaceFromIP(nodeIPs *utilip.DualStackIPs) (v4IPNet *net.IPNet, v6IPNet *net.IPNet, iface *net.Interface, err error) {
+	return getIPNetDeviceFromIP(nodeIPs, sets.NewString(i.hostGateway))
+}

pkg/agent/agent_linux.go

@@ -47,7 +47,7 @@ func (i *Initializer) prepareOVSBridge() error {
 	klog.Infof("Preparing OVS bridge for AntreaFlexibleIPAM")
 	// Get uplink network configuration.
 	// TODO(gran): support IPv6
-	_, _, adapter, err := util.GetIPNetDeviceFromIP(&utilip.DualStackIPs{IPv4: i.nodeConfig.NodeIPv4Addr.IP})
+	_, _, adapter, err := i.getNodeInterfaceFromIP(&utilip.DualStackIPs{IPv4: i.nodeConfig.NodeIPv4Addr.IP})
 	if err != nil {
 		return err
 	}

pkg/agent/agent_test.go

@@ -28,6 +28,7 @@ import (
 	"github.com/stretchr/testify/require"
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/client-go/kubernetes/fake"
 
 	"antrea.io/antrea/pkg/agent/cniserver"
@@ -422,7 +423,7 @@ func TestInitNodeLocalConfig(t *testing.T) {
 
 func mockGetIPNetDeviceFromIP(ipNet *net.IPNet, ipDevice *net.Interface) func() {
 	prevGetIPNetDeviceFromIP := getIPNetDeviceFromIP
-	getIPNetDeviceFromIP = func(localIP *ip.DualStackIPs) (*net.IPNet, *net.IPNet, *net.Interface, error) {
+	getIPNetDeviceFromIP = func(localIP *ip.DualStackIPs, ignoredHostInterfaces sets.String) (*net.IPNet, *net.IPNet, *net.Interface, error) {
 		return ipNet, nil, ipDevice, nil
 	}
 	return func() { getIPNetDeviceFromIP = prevGetIPNetDeviceFromIP }

pkg/agent/agent_windows.go

@@ -51,7 +51,7 @@ func (i *Initializer) prepareHostNetwork() error {
 	// Get uplink network configuration. The uplink interface is the one used for transporting Pod traffic across Nodes.
 	// Use the interface specified with "transportInterface" in the configuration if configured, otherwise the interface
 	// configured with NodeIP is used as uplink.
-	_, _, adapter, err := util.GetIPNetDeviceFromIP(&ip.DualStackIPs{IPv4: i.nodeConfig.NodeTransportIPv4Addr.IP})
+	_, _, adapter, err := i.getNodeInterfaceFromIP(&ip.DualStackIPs{IPv4: i.nodeConfig.NodeTransportIPv4Addr.IP})
 	if err != nil {
 		return err
 	}

pkg/agent/controller/egress/egress_controller.go

@@ -151,7 +151,7 @@ func NewEgressController(
 	ifaceStore interfacestore.InterfaceStore,
 	routeClient route.Interface,
 	nodeName string,
-	nodeTransportIP net.IP,
+	nodeTransportInterface string,
 	cluster *memberlist.Cluster,
 	egressInformer crdinformers.EgressInformer,
 	nodeInformer coreinformers.NodeInformer,
@@ -176,7 +176,7 @@ func NewEgressController(
 		idAllocator:          newIDAllocator(minEgressMark, maxEgressMark),
 		cluster:              cluster,
 	}
-	ipAssigner, err := ipassigner.NewIPAssigner(nodeTransportIP, egressDummyDevice)
+	ipAssigner, err := ipassigner.NewIPAssigner(nodeTransportInterface, egressDummyDevice)
 	if err != nil {
 		return nil, fmt.Errorf("initializing egressIP assigner failed: %v", err)
 	}

pkg/agent/controller/serviceexternalip/controller.go

@@ -17,7 +17,6 @@ package serviceexternalip
 import (
 	"context"
 	"fmt"
-	"net"
 	"sync"
 	"time"
 
@@ -86,7 +85,7 @@ type ServiceExternalIPController struct {
 
 func NewServiceExternalIPController(
 	nodeName string,
-	nodeTransportIP net.IP,
+	nodeTransportInterface string,
 	client kubernetes.Interface,
 	cluster memberlist.Interface,
 	serviceInformer coreinformers.ServiceInformer,
@@ -107,7 +106,7 @@ func NewServiceExternalIPController(
 		externalIPStates:      make(map[apimachinerytypes.NamespacedName]externalIPState),
 		localIPDetector:       localIPDetector,
 	}
-	ipAssigner, err := ipassigner.NewIPAssigner(nodeTransportIP, ingressDummyDevice)
+	ipAssigner, err := ipassigner.NewIPAssigner(nodeTransportInterface, ingressDummyDevice)
 	if err != nil {
 		return nil, fmt.Errorf("initializing service external IP assigner failed: %v", err)
 	}

pkg/agent/ipassigner/ip_assigner_linux.go

@@ -26,7 +26,6 @@ import (
 	"antrea.io/antrea/pkg/agent/util"
 	"antrea.io/antrea/pkg/agent/util/arping"
 	"antrea.io/antrea/pkg/agent/util/ndp"
-	"antrea.io/antrea/pkg/util/ip"
 )
 
 // ipAssigner creates a dummy device and assigns IPs to it.
@@ -47,16 +46,10 @@ type ipAssigner struct {
 }
 
 // NewIPAssigner returns an *ipAssigner.
-func NewIPAssigner(nodeTransportIPAddr net.IP, dummyDeviceName string) (*ipAssigner, error) {
-	nodeTransportIPs := new(ip.DualStackIPs)
-	if nodeTransportIPAddr.To4() == nil {
-		nodeTransportIPs.IPv6 = nodeTransportIPAddr
-	} else {
-		nodeTransportIPs.IPv4 = nodeTransportIPAddr
-	}
-	_, _, externalInterface, err := util.GetIPNetDeviceFromIP(nodeTransportIPs)
+func NewIPAssigner(nodeTransportInterface string, dummyDeviceName string) (*ipAssigner, error) {
+	_, _, externalInterface, err := util.GetIPNetDeviceByName(nodeTransportInterface)
 	if err != nil {
-		return nil, fmt.Errorf("get IPNetDevice from ip %v error: %+v", nodeTransportIPAddr, err)
+		return nil, fmt.Errorf("get IPNetDevice from name %s error: %+v", nodeTransportInterface, err)
 	}
 
 	dummyDevice, err := ensureDummyDevice(dummyDeviceName)

pkg/agent/ipassigner/ip_assigner_windows.go

@@ -15,15 +15,13 @@
 package ipassigner
 
 import (
-	"net"
-
 	"k8s.io/apimachinery/pkg/util/sets"
 )
 
 type ipAssigner struct {
 }
 
-func NewIPAssigner(nodeTransportIPAddr net.IP, dummyDeviceName string) (*ipAssigner, error) {
+func NewIPAssigner(nodeTransportInterface string, dummyDeviceName string) (*ipAssigner, error) {
 	return nil, nil
 }
 

pkg/agent/util/net.go

@@ -111,8 +111,9 @@ func dialUnix(address string) (net.Conn, error) {
 	return net.Dial("unix", address)
 }
 
-// GetIPNetDeviceFromIP returns local IPs/masks and associated device from IP.
-func GetIPNetDeviceFromIP(localIPs *ip.DualStackIPs) (v4IPNet *net.IPNet, v6IPNet *net.IPNet, iface *net.Interface, err error) {
+// GetIPNetDeviceFromIP returns local IPs/masks and associated device from IP, and ignores the interfaces which have
+// names in the ignoredInterfaces.
+func GetIPNetDeviceFromIP(localIPs *ip.DualStackIPs, ignoredInterfaces sets.String) (v4IPNet *net.IPNet, v6IPNet *net.IPNet, iface *net.Interface, err error) {
 	linkList, err := net.Interfaces()
 	if err != nil {
 		return nil, nil, nil, err
@@ -129,19 +130,23 @@ func GetIPNetDeviceFromIP(localIPs *ip.DualStackIPs) (v4IPNet *net.IPNet, v6IPNe
 		return nil
 	}
 	for i := range linkList {
-		addrList, err := linkList[i].Addrs()
+		link := linkList[i]
+		if ignoredInterfaces.Has(link.Name) {
+			continue
+		}
+		addrList, err := link.Addrs()
 		if err != nil {
 			continue
 		}
 		for _, addr := range addrList {
 			if ipNet, ok := addr.(*net.IPNet); ok {
 				if ipNet.IP.Equal(localIPs.IPv4) {
-					if err := saveIface(&linkList[i]); err != nil {
+					if err := saveIface(&link); err != nil {
 						return nil, nil, nil, err
 					}
 					v4IPNet = ipNet
 				} else if ipNet.IP.Equal(localIPs.IPv6) {
-					if err := saveIface(&linkList[i]); err != nil {
+					if err := saveIface(&link); err != nil {
 						return nil, nil, nil, err
 					}
 					v6IPNet = ipNet

pkg/agent/util/net_test.go

@@ -20,6 +20,8 @@ import (
 	"strings"
 	"testing"
 
+	"k8s.io/apimachinery/pkg/util/sets"
+
 	"antrea.io/antrea/pkg/util/ip"
 )
 
@@ -58,7 +60,7 @@ func TestGetDefaultLocalNodeAddr(t *testing.T) {
 	localAddr := conn.LocalAddr().(*net.UDPAddr).IP
 
 	nodeIPs := &ip.DualStackIPs{IPv4: localAddr}
-	_, _, dev, err := GetIPNetDeviceFromIP(nodeIPs)
+	_, _, dev, err := GetIPNetDeviceFromIP(nodeIPs, sets.NewString())
 	if err != nil {
 		t.Error(err)
 	}

test/integration/agent/ip_assigner_linux_test.go

@@ -30,10 +30,10 @@ import (
 const dummyDeviceName = "antrea-dummy0"
 
 func TestIPAssigner(t *testing.T) {
-	nodeIPAddr := nodeIPv4.IP
-	require.NotNil(t, nodeIPAddr, "Get Node IP failed")
+	nodeLinkName := nodeIntf.Name
+	require.NotNil(t, nodeLinkName, "Get Node link failed")
 
-	ipAssigner, err := ipassigner.NewIPAssigner(nodeIPAddr, dummyDeviceName)
+	ipAssigner, err := ipassigner.NewIPAssigner(nodeLinkName, dummyDeviceName)
 	require.NoError(t, err, "Initializing IP assigner failed")
 
 	dummyDevice, err := netlink.LinkByName(dummyDeviceName)
@@ -65,7 +65,7 @@ func TestIPAssigner(t *testing.T) {
 	assert.Equal(t, desiredIPs, actualIPs, "Actual IPs don't match")
 
 	// NewIPAssigner should load existing IPs correctly.
-	newIPAssigner, err := ipassigner.NewIPAssigner(nodeIPAddr, dummyDeviceName)
+	newIPAssigner, err := ipassigner.NewIPAssigner(nodeLinkName, dummyDeviceName)
 	require.NoError(t, err, "Initializing new IP assigner failed")
 	assert.Equal(t, desiredIPs, newIPAssigner.AssignedIPs(), "Assigned IPs don't match")
 

test/integration/agent/route_test.go

@@ -31,6 +31,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/vishvananda/netlink"
 	"golang.org/x/net/nettest"
+	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 
 	"antrea.io/antrea/pkg/agent/config"
@@ -56,7 +57,7 @@ var (
 		conn, _ := net.Dial("udp", "8.8.8.8:80")
 		defer conn.Close()
 		return &utilip.DualStackIPs{IPv4: conn.LocalAddr().(*net.UDPAddr).IP}
-	}())
+	}(), sets.NewString())
 	nodeLink, _  = netlink.LinkByName(nodeIntf.Name)
 	localPeerIP  = ip.NextIP(nodeIPv4.IP)
 	remotePeerIP = net.ParseIP("50.50.50.1")