Allow Node SNAT for Static Egress case

Implemented best effort scenario, where in case of
static Egress also, if there is no egress node then
the packets will be sent using normal Node SNAT, as
in case of dynamic Egress.

Signed-off-by: Pulkit Jain <[email protected]>

pkg/agent/controller/egress/egress_controller.go

@@ -1118,39 +1118,42 @@ func (c *EgressController) syncEgress(egressName string) error {
 	}()
 
 	egressIP := net.ParseIP(eState.egressIP)
-	// Install SNAT flows for desired Pods.
-	for pod := range pods {
-		eState.pods.Insert(pod)
-		stalePods.Delete(pod)
+	egress, _ = c.egressLister.Get(egressName)
+	if egress.Status.EgressNode != "" {
+		// Install SNAT flows for desired Pods.
+		for pod := range pods {
+			eState.pods.Insert(pod)
+			stalePods.Delete(pod)
+
+			// If the Egress is not the effective one for the Pod, do nothing.
+			if !c.bindPodEgress(pod, egressName) {
+				continue
+			}
 
-		// If the Egress is not the effective one for the Pod, do nothing.
-		if !c.bindPodEgress(pod, egressName) {
-			continue
-		}
+			// Get the Pod's openflow port.
+			parts := strings.Split(pod, "/")
+			podNamespace, podName := parts[0], parts[1]
+			ifaces := c.ifaceStore.GetContainerInterfacesByPod(podName, podNamespace)
+			if len(ifaces) == 0 {
+				klog.Infof("Interfaces of Pod %s/%s not found", podNamespace, podName)
+				continue
+			}
 
-		// Get the Pod's openflow port.
-		parts := strings.Split(pod, "/")
-		podNamespace, podName := parts[0], parts[1]
-		ifaces := c.ifaceStore.GetContainerInterfacesByPod(podName, podNamespace)
-		if len(ifaces) == 0 {
-			klog.Infof("Interfaces of Pod %s/%s not found", podNamespace, podName)
-			continue
+			ofPort := ifaces[0].OFPort
+			if eState.ofPorts.Has(ofPort) {
+				staleOFPorts.Delete(ofPort)
+				continue
+			}
+			if err := c.ofClient.InstallPodSNATFlows(uint32(ofPort), egressIP, mark); err != nil {
+				return err
+			}
+			eState.ofPorts.Insert(ofPort)
 		}
 
-		ofPort := ifaces[0].OFPort
-		if eState.ofPorts.Has(ofPort) {
-			staleOFPorts.Delete(ofPort)
-			continue
-		}
-		if err := c.ofClient.InstallPodSNATFlows(uint32(ofPort), egressIP, mark); err != nil {
+		// Uninstall SNAT flows for stale Pods.
+		if err := c.uninstallPodFlows(egressName, eState, staleOFPorts, stalePods); err != nil {
 			return err
 		}
-		eState.ofPorts.Insert(ofPort)
-	}
-
-	// Uninstall SNAT flows for stale Pods.
-	if err := c.uninstallPodFlows(egressName, eState, staleOFPorts, stalePods); err != nil {
-		return err
 	}
 	return nil
 }