Fix ipv6 sysctl required by non-ipv6 LoadBalancer service

pkg/cloudprovider/servicelb.go

@@ -52,7 +52,7 @@ const (
 )
 
 var (
-	DefaultLBImage = "rancher/klipper-lb:v0.4.7"
+	DefaultLBImage = "rancher/klipper-lb:v0.4.9"
 )
 
 func (k *k3s) Register(ctx context.Context,
@@ -437,14 +437,21 @@ func (k *k3s) newDaemonSet(svc *core.Service) (*apps.DaemonSet, error) {
 		return nil, err
 	}
 	sourceRanges := strings.Join(sourceRangesSet.StringSlice(), ",")
+	securityContext := &core.PodSecurityContext{}
 
 	for _, ipFamily := range svc.Spec.IPFamilies {
-		if ipFamily == core.IPv6Protocol && sourceRanges == "0.0.0.0/0" {
+		switch ipFamily {
+		case core.IPv4Protocol:
+			securityContext.Sysctls = append(securityContext.Sysctls, core.Sysctl{Name: "net.ipv4.ip_forward", Value: "1"})
+		case core.IPv6Protocol:
+			securityContext.Sysctls = append(securityContext.Sysctls, core.Sysctl{Name: "net.ipv6.conf.all.forwarding", Value: "1"})
+			if sourceRanges == "0.0.0.0/0" {
 				// The upstream default load-balancer source range only includes IPv4, even if the service is IPv6-only or dual-stack.
 				// If using the default range, and IPv6 is enabled, also allow IPv6.
 				sourceRanges += ",::/0"
 			}
 		}
+	}
 
 	ds := &apps.DaemonSet{
 		ObjectMeta: meta.ObjectMeta{
@@ -478,12 +485,7 @@ func (k *k3s) newDaemonSet(svc *core.Service) (*apps.DaemonSet, error) {
 					PriorityClassName:            priorityClassName,
 					ServiceAccountName:           "svclb",
 					AutomountServiceAccountToken: utilsptr.To(false),
-					SecurityContext: &core.PodSecurityContext{
-						Sysctls: []core.Sysctl{
-							{Name: "net.ipv4.ip_forward", Value: "1"},
-							{Name: "net.ipv6.conf.all.forwarding", Value: "1"},
-						},
-					},
+					SecurityContext:              securityContext,
 					Tolerations: []core.Toleration{
 						{
 							Key:      util.MasterRoleLabelKey,

scripts/airgap/image-list.txt

 docker.io/rancher/klipper-helm:v0.8.4-build20240523
-docker.io/rancher/klipper-lb:v0.4.7
+docker.io/rancher/klipper-lb:v0.4.9
 docker.io/rancher/local-path-provisioner:v0.0.28
 docker.io/rancher/mirrored-coredns-coredns:1.10.1
 docker.io/rancher/mirrored-library-busybox:1.36.1