Support NativeLB option in GatewayAPI provider

Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>

docs/content/reference/static-configuration/cli-ref.md

@@ -801,6 +801,9 @@ Kubernetes label selector to select specific GatewayClasses.
 `--providers.kubernetesgateway.namespaces`:  
 Kubernetes namespaces.
 
+`--providers.kubernetesgateway.nativelbbydefault`:  
+Defines whether to use Native Kubernetes load-balancing by default. (Default: ```false```)
+
 `--providers.kubernetesgateway.statusaddress.hostname`:  
 Hostname used for Kubernetes Gateway status address.
 

docs/content/reference/static-configuration/env-ref.md

@@ -801,6 +801,9 @@ Kubernetes label selector to select specific GatewayClasses.
 `TRAEFIK_PROVIDERS_KUBERNETESGATEWAY_NAMESPACES`:  
 Kubernetes namespaces.
 
+`TRAEFIK_PROVIDERS_KUBERNETESGATEWAY_NATIVELBBYDEFAULT`:  
+Defines whether to use Native Kubernetes load-balancing by default. (Default: ```false```)
+
 `TRAEFIK_PROVIDERS_KUBERNETESGATEWAY_STATUSADDRESS_HOSTNAME`:  
 Hostname used for Kubernetes Gateway status address.
 

docs/content/reference/static-configuration/file.toml

@@ -158,6 +158,7 @@
     labelSelector = "foobar"
     throttleDuration = "42s"
     experimentalChannel = true
+    nativeLBByDefault = true
     [providers.kubernetesGateway.statusAddress]
       ip = "foobar"
       hostname = "foobar"

docs/content/reference/static-configuration/file.yaml

@@ -183,6 +183,7 @@ providers:
       service:
         name: foobar
         namespace: foobar
+    nativeLBByDefault: true
   rest:
     insecure: true
   consulCatalog:

pkg/provider/kubernetes/crd/kubernetes_test.go

@@ -1609,7 +1609,7 @@ func TestLoadIngressRouteTCPs(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -4891,7 +4891,7 @@ func TestLoadIngressRoutes(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -4972,7 +4972,7 @@ func TestLoadIngressRoutes_multipleEndpointAddresses(t *testing.T) {
 
 	k8sObjects, crdObjects := readResources(t, []string{"services.yml", "with_multiple_endpointslices.yml"})
 
-	kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+	kubeClient := kubefake.NewClientset(k8sObjects...)
 	crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 	client := newClientImpl(kubeClient, crdClient)
@@ -5481,7 +5481,7 @@ func TestLoadIngressRouteUDPs(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -6971,7 +6971,7 @@ func TestCrossNamespace(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -7240,7 +7240,7 @@ func TestExternalNameService(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -7421,7 +7421,7 @@ func TestNativeLB(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -7686,7 +7686,7 @@ func TestNodePortLB(t *testing.T) {
 
 			k8sObjects, crdObjects := readResources(t, test.paths)
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)
@@ -7727,7 +7727,7 @@ func TestCreateBasicAuthCredentials(t *testing.T) {
 		}
 	}
 
-	kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+	kubeClient := kubefake.NewClientset(k8sObjects...)
 	crdClient := traefikcrdfake.NewSimpleClientset()
 
 	client := newClientImpl(kubeClient, crdClient)
@@ -8198,7 +8198,7 @@ func TestGlobalNativeLB(t *testing.T) {
 				}
 			}
 
-			kubeClient := kubefake.NewSimpleClientset(k8sObjects...)
+			kubeClient := kubefake.NewClientset(k8sObjects...)
 			crdClient := traefikcrdfake.NewSimpleClientset(crdObjects...)
 
 			client := newClientImpl(kubeClient, crdClient)

pkg/provider/kubernetes/gateway/annotations.go

@@ -0,0 +1,54 @@
+package gateway
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/traefik/traefik/v3/pkg/config/label"
+)
+
+const annotationsPrefix = "traefik.io/"
+
+// ServiceConfig is the service's root configuration from annotations.
+type ServiceConfig struct {
+	Service Service `json:"service"`
+}
+
+// Service is the service's configuration from annotations.
+type Service struct {
+	NativeLB bool `json:"nativeLB"`
+}
+
+func parseServiceAnnotations(annotations map[string]string) (ServiceConfig, error) {
+	var svcConf ServiceConfig
+
+	labels := convertAnnotations(annotations)
+	if len(labels) == 0 {
+		return svcConf, nil
+	}
+
+	if err := label.Decode(labels, &svcConf, "traefik.service."); err != nil {
+		return svcConf, fmt.Errorf("decoding labels: %w", err)
+	}
+
+	return svcConf, nil
+}
+
+func convertAnnotations(annotations map[string]string) map[string]string {
+	if len(annotations) == 0 {
+		return nil
+	}
+
+	result := make(map[string]string)
+
+	for key, value := range annotations {
+		if !strings.HasPrefix(key, annotationsPrefix) {
+			continue
+		}
+
+		newKey := strings.ReplaceAll(key, "io/", "")
+		result[newKey] = value
+	}
+
+	return result
+}

pkg/provider/kubernetes/gateway/annotations_test.go

@@ -0,0 +1,89 @@
+package gateway
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_parseServiceConfig(t *testing.T) {
+	testCases := []struct {
+		desc        string
+		annotations map[string]string
+		expected    ServiceConfig
+	}{
+		{
+			desc: "service annotations",
+			annotations: map[string]string{
+				"ingress.kubernetes.io/foo":   "bar",
+				"traefik.io/foo":              "bar",
+				"traefik.io/service.nativelb": "true",
+			},
+			expected: ServiceConfig{
+				Service: Service{
+					NativeLB: true,
+				},
+			},
+		},
+		{
+			desc:        "empty map",
+			annotations: map[string]string{},
+			expected:    ServiceConfig{},
+		},
+		{
+			desc:        "nil map",
+			annotations: nil,
+			expected:    ServiceConfig{},
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			cfg, err := parseServiceAnnotations(test.annotations)
+			require.NoError(t, err)
+
+			assert.Equal(t, test.expected, cfg)
+		})
+	}
+}
+
+func Test_convertAnnotations(t *testing.T) {
+	testCases := []struct {
+		desc        string
+		annotations map[string]string
+		expected    map[string]string
+	}{
+		{
+			desc: "service annotations",
+			annotations: map[string]string{
+				"traefik.io/service.nativelb": "true",
+			},
+			expected: map[string]string{
+				"traefik.service.nativelb": "true",
+			},
+		},
+		{
+			desc:        "empty map",
+			annotations: map[string]string{},
+			expected:    nil,
+		},
+		{
+			desc:        "nil map",
+			annotations: nil,
+			expected:    nil,
+		},
+	}
+
+	for _, test := range testCases {
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			labels := convertAnnotations(test.annotations)
+
+			assert.Equal(t, test.expected, labels)
+		})
+	}
+}

pkg/provider/kubernetes/gateway/fixtures/httproute/simple_nativelb.yml

@@ -0,0 +1,51 @@
+---
+kind: GatewayClass
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: my-gateway-class
+spec:
+  controllerName: traefik.io/gateway-controller
+
+---
+kind: Gateway
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: my-gateway
+  namespace: default
+spec:
+  gatewayClassName: my-gateway-class
+  listeners: # Use GatewayClass defaults for listener definition.
+    - name: http
+      protocol: HTTP
+      port: 80
+      allowedRoutes:
+        kinds:
+          - kind: HTTPRoute
+            group: gateway.networking.k8s.io
+        namespaces:
+          from: Same
+
+---
+kind: HTTPRoute
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: http-app-1
+  namespace: default
+spec:
+  parentRefs:
+    - name: my-gateway
+      kind: Gateway
+      group: gateway.networking.k8s.io
+  hostnames:
+    - "foo.com"
+  rules:
+    - matches:
+        - path:
+            type: Exact
+            value: /bar
+      backendRefs:
+        - name: whoami-native
+          port: 80
+          weight: 1
+          kind: Service
+          group: ""

pkg/provider/kubernetes/gateway/fixtures/services.yml

@@ -5,6 +5,7 @@ metadata:
   namespace: default
 
 spec:
+  clusterIP: 10.10.10.1
   ports:
     - name: web2
       protocol: TCP
@@ -262,6 +263,7 @@ metadata:
   namespace: default
 
 spec:
+  clusterIP: 10.10.10.1
   ports:
     - protocol: TCP
       port: 9000
@@ -424,3 +426,45 @@ spec:
       port: 80
       name: wss
       appProtocol: kubernetes.io/wss
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoami-native
+  namespace: default
+  annotations:
+    traefik.io/service.nativelb: "true"
+spec:
+  clusterIP: 10.10.10.1
+  ports:
+    - name: web2
+      protocol: TCP
+      port: 8000
+      targetPort: web2
+    - name: web
+      protocol: TCP
+      port: 80
+      targetPort: web
+  selector:
+    app: containous
+    task: whoami
+
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: whoamitcp-native
+  namespace: default
+  annotations:
+    traefik.io/service.nativelb: "true"
+
+spec:
+  clusterIP: 10.10.10.1
+  ports:
+    - protocol: TCP
+      port: 9000
+      name: tcp-1
+    - protocol: TCP
+      port: 10000
+      name: tcp-2

pkg/provider/kubernetes/gateway/fixtures/tcproute/simple_nativelb.yml

@@ -0,0 +1,46 @@
+---
+kind: GatewayClass
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: my-gateway-class
+  namespace: default
+spec:
+  controllerName: traefik.io/gateway-controller
+
+---
+kind: Gateway
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: my-tcp-gateway
+  namespace: default
+spec:
+  gatewayClassName: my-gateway-class
+  listeners: # Use GatewayClass defaults for listener definition.
+    - name: tcp
+      protocol: TCP
+      port: 9000
+      allowedRoutes:
+        namespaces:
+          from: Same
+        kinds:
+          - kind: TCPRoute
+            group: gateway.networking.k8s.io
+
+---
+kind: TCPRoute
+apiVersion: gateway.networking.k8s.io/v1alpha2
+metadata:
+  name: tcp-app-1
+  namespace: default
+spec:
+  parentRefs:
+    - name: my-tcp-gateway
+      kind: Gateway
+      group: gateway.networking.k8s.io
+  rules:
+    - backendRefs:
+        - name: whoamitcp-native
+          port: 9000
+          weight: 1
+          kind: Service
+          group: ""

pkg/provider/kubernetes/gateway/fixtures/tlsroute/simple_nativelb.yml

@@ -0,0 +1,60 @@
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: supersecret
+  namespace: default
+
+data:
+  tls.crt: LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCi0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0=
+  tls.key: LS0tLS1CRUdJTiBQUklWQVRFIEtFWS0tLS0tCi0tLS0tRU5EIFBSSVZBVEUgS0VZLS0tLS0=
+
+---
+kind: GatewayClass
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: my-gateway-class
+  namespace: default
+spec:
+  controllerName: traefik.io/gateway-controller
+
+---
+kind: Gateway
+apiVersion: gateway.networking.k8s.io/v1
+metadata:
+  name: my-tls-gateway
+  namespace: default
+spec:
+  gatewayClassName: my-gateway-class
+  listeners: # Use GatewayClass defaults for listener definition.
+    - name: tls
+      protocol: TLS
+      hostname: foo.example.com
+      port: 9000
+      tls:
+        mode: Passthrough
+      allowedRoutes:
+        kinds:
+          - kind: TLSRoute
+            group: gateway.networking.k8s.io
+        namespaces:
+          from: Same
+
+---
+kind: TLSRoute
+apiVersion: gateway.networking.k8s.io/v1alpha2
+metadata:
+  name: tls-app-1
+  namespace: default
+spec:
+  parentRefs:
+    - name: my-tls-gateway
+      kind: Gateway
+      group: gateway.networking.k8s.io
+  rules:
+    - backendRefs:
+        - name: whoamitcp-native
+          port: 9000
+          weight: 1
+          kind: Service
+          group: ""

pkg/provider/kubernetes/gateway/grpcroute.go

@@ -350,7 +350,7 @@ func (p *Provider) loadGRPCServers(namespace string, route *gatev1.GRPCRoute, ba
 
 	for _, ba := range backendAddresses {
 		lb.Servers = append(lb.Servers, dynamic.Server{
-			URL: fmt.Sprintf("h2c://%s", net.JoinHostPort(ba.Address, strconv.Itoa(int(ba.Port)))),
+			URL: fmt.Sprintf("h2c://%s", net.JoinHostPort(ba.IP, strconv.Itoa(int(ba.Port)))),
 		})
 	}
 	return lb, nil

pkg/provider/kubernetes/gateway/httproute.go

@@ -482,7 +482,7 @@ func (p *Provider) loadHTTPServers(namespace string, route *gatev1.HTTPRoute, ba
 
 	for _, ba := range backendAddresses {
 		lb.Servers = append(lb.Servers, dynamic.Server{
-			URL: fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(ba.Address, strconv.Itoa(int(ba.Port)))),
+			URL: fmt.Sprintf("%s://%s", protocol, net.JoinHostPort(ba.IP, strconv.Itoa(int(ba.Port)))),
 		})
 	}
 	return lb, svcPort, nil

pkg/provider/kubernetes/gateway/kubernetes.go

@@ -65,6 +65,7 @@ type Provider struct {
 	ThrottleDuration    ptypes.Duration     `description:"Kubernetes refresh throttle duration" json:"throttleDuration,omitempty" toml:"throttleDuration,omitempty" yaml:"throttleDuration,omitempty" export:"true"`
 	ExperimentalChannel bool                `description:"Toggles Experimental Channel resources support (TCPRoute, TLSRoute...)." json:"experimentalChannel,omitempty" toml:"experimentalChannel,omitempty" yaml:"experimentalChannel,omitempty" export:"true"`
 	StatusAddress       *StatusAddress      `description:"Defines the Kubernetes Gateway status address." json:"statusAddress,omitempty" toml:"statusAddress,omitempty" yaml:"statusAddress,omitempty" export:"true"`
+	NativeLBByDefault   bool                `description:"Defines whether to use Native Kubernetes load-balancing by default." json:"nativeLBByDefault,omitempty" toml:"nativeLBByDefault,omitempty" yaml:"nativeLBByDefault,omitempty" export:"true"`
 
 	EntryPoints map[string]Entrypoint `json:"-" toml:"-" yaml:"-" label:"-" file:"-"`
 
@@ -873,7 +874,7 @@ func (p *Provider) allowedNamespaces(gatewayNamespace string, routeNamespaces *g
 }
 
 type backendAddress struct {
-	Address string
+	IP   string
 	Port int32
 }
 
@@ -889,6 +890,9 @@ func (p *Provider) getBackendAddresses(namespace string, ref gatev1.BackendRef)
 	if !exists {
 		return nil, corev1.ServicePort{}, errors.New("service not found")
 	}
+	if service.Spec.Type == corev1.ServiceTypeExternalName {
+		return nil, corev1.ServicePort{}, errors.New("type ExternalName is not supported for Kubernetes Service reference")
+	}
 
 	var svcPort *corev1.ServicePort
 	for _, p := range service.Spec.Ports {
@@ -901,6 +905,22 @@ func (p *Provider) getBackendAddresses(namespace string, ref gatev1.BackendRef)
 		return nil, corev1.ServicePort{}, fmt.Errorf("service port %d not found", *ref.Port)
 	}
 
+	annotationsConfig, err := parseServiceAnnotations(service.Annotations)
+	if err != nil {
+		return nil, corev1.ServicePort{}, fmt.Errorf("parsing service annotations config: %w", err)
+	}
+
+	if p.NativeLBByDefault || annotationsConfig.Service.NativeLB {
+		if service.Spec.ClusterIP == "" || service.Spec.ClusterIP == "None" {
+			return nil, corev1.ServicePort{}, fmt.Errorf("no clusterIP found for service: %s/%s", service.Namespace, service.Name)
+		}
+
+		return []backendAddress{{
+			IP:   service.Spec.ClusterIP,
+			Port: svcPort.Port,
+		}}, *svcPort, nil
+	}
+
 	endpointSlices, err := p.client.ListEndpointSlicesForService(namespace, string(ref.Name))
 	if err != nil {
 		return nil, corev1.ServicePort{}, fmt.Errorf("getting endpointslices: %w", err)
@@ -935,7 +955,7 @@ func (p *Provider) getBackendAddresses(namespace string, ref gatev1.BackendRef)
 
 				uniqAddresses[address] = struct{}{}
 				backendServers = append(backendServers, backendAddress{
-					Address: address,
+					IP:   address,
 					Port: port,
 				})
 			}

pkg/provider/kubernetes/gateway/kubernetes_test.go

@@ -57,6 +57,7 @@ func TestLoadHTTPRoutes(t *testing.T) {
 		expected            *dynamic.Configuration
 		entryPoints         map[string]Entrypoint
 		experimentalChannel bool
+		nativeLB            bool
 	}{
 		{
 			desc: "Empty",
@@ -2334,6 +2335,123 @@ func TestLoadHTTPRoutes(t *testing.T) {
 				TLS: &dynamic.TLSConfiguration{},
 			},
 		},
+		{
+			desc:     "Simple HTTPRoute with NativeLBByDefault enabled",
+			paths:    []string{"services.yml", "httproute/simple.yml"},
+			nativeLB: true,
+			entryPoints: map[string]Entrypoint{"web": {
+				Address: ":80",
+			}},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					Routers: map[string]*dynamic.Router{
+						"default-http-app-1-my-gateway-web-0-1c0cf64bde37d9d0df06": {
+							EntryPoints: []string{"web"},
+							Service:     "default-http-app-1-my-gateway-web-0-1c0cf64bde37d9d0df06-wrr",
+							Rule:        "Host(`foo.com`) && Path(`/bar`)",
+							Priority:    100008,
+							RuleSyntax:  "v3",
+						},
+					},
+					Middlewares: map[string]*dynamic.Middleware{},
+					Services: map[string]*dynamic.Service{
+						"default-http-app-1-my-gateway-web-0-1c0cf64bde37d9d0df06-wrr": {
+							Weighted: &dynamic.WeightedRoundRobin{
+								Services: []dynamic.WRRService{
+									{
+										Name:   "default-whoami-80",
+										Weight: ptr.To(1),
+									},
+								},
+							},
+						},
+						"default-whoami-80": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.10.10.1:80",
+									},
+								},
+								PassHostHeader: ptr.To(true),
+								ResponseForwarding: &dynamic.ResponseForwarding{
+									FlushInterval: ptypes.Duration(100 * time.Millisecond),
+								},
+							},
+						},
+					},
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:  "Simple HTTPRoute with NativeLB annotation",
+			paths: []string{"services.yml", "httproute/simple_nativelb.yml"},
+			entryPoints: map[string]Entrypoint{"web": {
+				Address: ":80",
+			}},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					Routers:           map[string]*dynamic.TCPRouter{},
+					Middlewares:       map[string]*dynamic.TCPMiddleware{},
+					Services:          map[string]*dynamic.TCPService{},
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					Routers: map[string]*dynamic.Router{
+						"default-http-app-1-my-gateway-web-0-1c0cf64bde37d9d0df06": {
+							EntryPoints: []string{"web"},
+							Service:     "default-http-app-1-my-gateway-web-0-1c0cf64bde37d9d0df06-wrr",
+							Rule:        "Host(`foo.com`) && Path(`/bar`)",
+							Priority:    100008,
+							RuleSyntax:  "v3",
+						},
+					},
+					Middlewares: map[string]*dynamic.Middleware{},
+					Services: map[string]*dynamic.Service{
+						"default-http-app-1-my-gateway-web-0-1c0cf64bde37d9d0df06-wrr": {
+							Weighted: &dynamic.WeightedRoundRobin{
+								Services: []dynamic.WRRService{
+									{
+										Name:   "default-whoami-native-80",
+										Weight: ptr.To(1),
+									},
+								},
+							},
+						},
+						"default-whoami-native-80": {
+							LoadBalancer: &dynamic.ServersLoadBalancer{
+								Servers: []dynamic.Server{
+									{
+										URL: "http://10.10.10.1:80",
+									},
+								},
+								PassHostHeader: ptr.To(true),
+								ResponseForwarding: &dynamic.ResponseForwarding{
+									FlushInterval: ptypes.Duration(100 * time.Millisecond),
+								},
+							},
+						},
+					},
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
 	}
 
 	for _, test := range testCases {
@@ -2363,6 +2481,7 @@ func TestLoadHTTPRoutes(t *testing.T) {
 			p := Provider{
 				EntryPoints:         test.entryPoints,
 				ExperimentalChannel: test.experimentalChannel,
+				NativeLBByDefault:   test.nativeLB,
 				client:              client,
 			}
 
@@ -3078,6 +3197,7 @@ func TestLoadTCPRoutes(t *testing.T) {
 		paths        []string
 		expected     *dynamic.Configuration
 		entryPoints  map[string]Entrypoint
+		nativeLB     bool
 	}{
 		{
 			desc: "Empty",
@@ -3826,6 +3946,113 @@ func TestLoadTCPRoutes(t *testing.T) {
 				TLS: &dynamic.TLSConfiguration{},
 			},
 		},
+		{
+			desc:     "Simple TCPRoute with NativeLBByDefault",
+			paths:    []string{"services.yml", "tcproute/simple.yml"},
+			nativeLB: true,
+			entryPoints: map[string]Entrypoint{
+				"tcp": {Address: ":9000"},
+			},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					Routers: map[string]*dynamic.TCPRouter{
+						"default-tcp-app-1-my-tcp-gateway-tcp-0-e3b0c44298fc1c149afb": {
+							EntryPoints: []string{"tcp"},
+							Service:     "default-tcp-app-1-my-tcp-gateway-tcp-0-e3b0c44298fc1c149afb-wrr",
+							Rule:        "HostSNI(`*`)",
+							RuleSyntax:  "v3",
+						},
+					},
+					Middlewares: map[string]*dynamic.TCPMiddleware{},
+					Services: map[string]*dynamic.TCPService{
+						"default-tcp-app-1-my-tcp-gateway-tcp-0-e3b0c44298fc1c149afb-wrr": {
+							Weighted: &dynamic.TCPWeightedRoundRobin{
+								Services: []dynamic.TCPWRRService{
+									{
+										Name:   "default-whoamitcp-9000",
+										Weight: ptr.To(1),
+									},
+								},
+							},
+						},
+						"default-whoamitcp-9000": {
+							LoadBalancer: &dynamic.TCPServersLoadBalancer{
+								Servers: []dynamic.TCPServer{
+									{
+										Address: "10.10.10.1:9000",
+									},
+								},
+							},
+						},
+					},
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:  "Simple TCPRoute with NativeLB annotation",
+			paths: []string{"services.yml", "tcproute/simple_nativelb.yml"},
+			entryPoints: map[string]Entrypoint{
+				"tcp": {Address: ":9000"},
+			},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					Routers: map[string]*dynamic.TCPRouter{
+						"default-tcp-app-1-my-tcp-gateway-tcp-0-e3b0c44298fc1c149afb": {
+							EntryPoints: []string{"tcp"},
+							Service:     "default-tcp-app-1-my-tcp-gateway-tcp-0-e3b0c44298fc1c149afb-wrr",
+							Rule:        "HostSNI(`*`)",
+							RuleSyntax:  "v3",
+						},
+					},
+					Middlewares: map[string]*dynamic.TCPMiddleware{},
+					Services: map[string]*dynamic.TCPService{
+						"default-tcp-app-1-my-tcp-gateway-tcp-0-e3b0c44298fc1c149afb-wrr": {
+							Weighted: &dynamic.TCPWeightedRoundRobin{
+								Services: []dynamic.TCPWRRService{
+									{
+										Name:   "default-whoamitcp-native-9000",
+										Weight: ptr.To(1),
+									},
+								},
+							},
+						},
+						"default-whoamitcp-native-9000": {
+							LoadBalancer: &dynamic.TCPServersLoadBalancer{
+								Servers: []dynamic.TCPServer{
+									{
+										Address: "10.10.10.1:9000",
+									},
+								},
+							},
+						},
+					},
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
 	}
 
 	for _, test := range testCases {
@@ -3854,6 +4081,7 @@ func TestLoadTCPRoutes(t *testing.T) {
 
 			p := Provider{
 				EntryPoints:         test.entryPoints,
+				NativeLBByDefault:   test.nativeLB,
 				ExperimentalChannel: true,
 				client:              client,
 			}
@@ -3869,8 +4097,9 @@ func TestLoadTLSRoutes(t *testing.T) {
 		desc         string
 		ingressClass string
 		paths        []string
-		expected     *dynamic.Configuration
 		entryPoints  map[string]Entrypoint
+		nativeLB     bool
+		expected     *dynamic.Configuration
 	}{
 		{
 			desc: "Empty",
@@ -4975,6 +5204,119 @@ func TestLoadTLSRoutes(t *testing.T) {
 				TLS: &dynamic.TLSConfiguration{},
 			},
 		},
+		{
+			desc:     "Simple TLSRoute with NativeLBByDefault",
+			paths:    []string{"services.yml", "tlsroute/simple_TLS_to_TLSRoute.yml"},
+			nativeLB: true,
+			entryPoints: map[string]Entrypoint{
+				"tcp": {Address: ":9000"},
+			},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					Routers: map[string]*dynamic.TCPRouter{
+						"default-tls-app-1-my-tls-gateway-tcp-0-e3b0c44298fc1c149afb": {
+							EntryPoints: []string{"tcp"},
+							Service:     "default-tls-app-1-my-tls-gateway-tcp-0-e3b0c44298fc1c149afb-wrr",
+							Rule:        "HostSNI(`foo.example.com`)",
+							RuleSyntax:  "v3",
+							TLS: &dynamic.RouterTCPTLSConfig{
+								Passthrough: true,
+							},
+						},
+					},
+					Middlewares: map[string]*dynamic.TCPMiddleware{},
+					Services: map[string]*dynamic.TCPService{
+						"default-tls-app-1-my-tls-gateway-tcp-0-e3b0c44298fc1c149afb-wrr": {
+							Weighted: &dynamic.TCPWeightedRoundRobin{
+								Services: []dynamic.TCPWRRService{
+									{
+										Name:   "default-whoamitcp-9000",
+										Weight: ptr.To(1),
+									},
+								},
+							},
+						},
+						"default-whoamitcp-9000": {
+							LoadBalancer: &dynamic.TCPServersLoadBalancer{
+								Servers: []dynamic.TCPServer{
+									{
+										Address: "10.10.10.1:9000",
+									},
+								},
+							},
+						},
+					},
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
+		{
+			desc:  "Simple TLSRoute with NativeLB annotation",
+			paths: []string{"services.yml", "tlsroute/simple_nativelb.yml"},
+			entryPoints: map[string]Entrypoint{
+				"tcp": {Address: ":9000"},
+			},
+			expected: &dynamic.Configuration{
+				UDP: &dynamic.UDPConfiguration{
+					Routers:  map[string]*dynamic.UDPRouter{},
+					Services: map[string]*dynamic.UDPService{},
+				},
+				TCP: &dynamic.TCPConfiguration{
+					Routers: map[string]*dynamic.TCPRouter{
+						"default-tls-app-1-my-tls-gateway-tcp-0-e3b0c44298fc1c149afb": {
+							EntryPoints: []string{"tcp"},
+							Service:     "default-tls-app-1-my-tls-gateway-tcp-0-e3b0c44298fc1c149afb-wrr",
+							Rule:        "HostSNI(`foo.example.com`)",
+							RuleSyntax:  "v3",
+							TLS: &dynamic.RouterTCPTLSConfig{
+								Passthrough: true,
+							},
+						},
+					},
+					Middlewares: map[string]*dynamic.TCPMiddleware{},
+					Services: map[string]*dynamic.TCPService{
+						"default-tls-app-1-my-tls-gateway-tcp-0-e3b0c44298fc1c149afb-wrr": {
+							Weighted: &dynamic.TCPWeightedRoundRobin{
+								Services: []dynamic.TCPWRRService{
+									{
+										Name:   "default-whoamitcp-native-9000",
+										Weight: ptr.To(1),
+									},
+								},
+							},
+						},
+						"default-whoamitcp-native-9000": {
+							LoadBalancer: &dynamic.TCPServersLoadBalancer{
+								Servers: []dynamic.TCPServer{
+									{
+										Address: "10.10.10.1:9000",
+									},
+								},
+							},
+						},
+					},
+					ServersTransports: map[string]*dynamic.TCPServersTransport{},
+				},
+				HTTP: &dynamic.HTTPConfiguration{
+					Routers:           map[string]*dynamic.Router{},
+					Middlewares:       map[string]*dynamic.Middleware{},
+					Services:          map[string]*dynamic.Service{},
+					ServersTransports: map[string]*dynamic.ServersTransport{},
+				},
+				TLS: &dynamic.TLSConfiguration{},
+			},
+		},
 	}
 
 	for _, test := range testCases {
@@ -5003,6 +5345,7 @@ func TestLoadTLSRoutes(t *testing.T) {
 
 			p := Provider{
 				EntryPoints:         test.entryPoints,
+				NativeLBByDefault:   test.nativeLB,
 				ExperimentalChannel: true,
 				client:              client,
 			}

pkg/provider/kubernetes/gateway/tcproute.go

@@ -286,7 +286,7 @@ func (p *Provider) loadTCPServers(namespace string, route *gatev1alpha2.TCPRoute
 
 	for _, ba := range backendAddresses {
 		lb.Servers = append(lb.Servers, dynamic.TCPServer{
-			Address: net.JoinHostPort(ba.Address, strconv.Itoa(int(ba.Port))),
+			Address: net.JoinHostPort(ba.IP, strconv.Itoa(int(ba.Port))),
 		})
 	}
 	return lb, nil

pkg/provider/kubernetes/gateway/tlsroute.go

@@ -289,7 +289,7 @@ func (p *Provider) loadTLSServers(namespace string, route *gatev1alpha2.TLSRoute
 	for _, ba := range backendAddresses {
 		lb.Servers = append(lb.Servers, dynamic.TCPServer{
 			// TODO determine whether the servers needs TLS, from the port?
-			Address: net.JoinHostPort(ba.Address, strconv.Itoa(int(ba.Port))),
+			Address: net.JoinHostPort(ba.IP, strconv.Itoa(int(ba.Port))),
 		})
 	}
 	return lb, nil