Clean up internal data when egress IPs go away

pkg/network/common/egressip.go

@@ -230,7 +230,7 @@ func (eit *EgressIPTracker) UpdateHostSubnetEgress(hs *networkapi.HostSubnet) {
 		movedEgressIPs := make([]string, 0, node.requestedIPs.Len())
 		for _, ip := range node.requestedIPs.UnsortedList() {
 			eg := eit.egressIPs[ip]
-			if eg.assignedNodeIP == node.nodeIP {
+			if eg != nil && eg.assignedNodeIP == node.nodeIP {
 				movedEgressIPs = append(movedEgressIPs, ip)
 				eit.deleteNodeEgressIP(node, ip)
 			}
@@ -308,7 +308,9 @@ func (eit *EgressIPTracker) UpdateNetNamespaceEgress(netns *networkapi.NetNamesp
 	// Even IPs that weren't added/removed need to be considered "changed", to
 	// ensure we correctly process reorderings, duplicates added/removed, etc.
 	for _, ip := range newRequestedIPs.Intersection(oldRequestedIPs).UnsortedList() {
-		eit.egressIPChanged(eit.egressIPs[ip])
+		if eg := eit.egressIPs[ip]; eg != nil {
+			eit.egressIPChanged(eg)
+		}
 	}
 
 	eit.syncEgressIPs()
@@ -332,7 +334,7 @@ func (eit *EgressIPTracker) egressIPActive(eg *egressIPInfo) (bool, error) {
 	}
 	for _, ip := range eg.namespaces[0].requestedIPs {
 		eg2 := eit.egressIPs[ip]
-		if eg2 != eg && len(eg2.nodes) == 1 && eg2.nodes[0] == eg.nodes[0] {
+		if eg2 != nil && eg2 != eg && len(eg2.nodes) == 1 && eg2.nodes[0] == eg.nodes[0] {
 			return false, fmt.Errorf("Multiple EgressIPs (%s, %s) for VNID %d on node %s", eg.ip, eg2.ip, eg.namespaces[0].vnid, eg.nodes[0].nodeIP)
 		}
 	}
@@ -358,6 +360,12 @@ func (eit *EgressIPTracker) syncEgressIPs() {
 		eit.syncEgressNamespaceState(ns)
 	}
 
+	for eg := range changedEgressIPs {
+		if len(eg.namespaces) == 0 && len(eg.nodes) == 0 {
+			delete(eit.egressIPs, eg.ip)
+		}
+	}
+
 	if eit.updateEgressCIDRs {
 		eit.updateEgressCIDRs = false
 		if eit.nodesWithCIDRs > 0 {