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firewalls_l4.go
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firewalls_l4.go
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/*
Copyright 2020 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package firewalls
import (
"strings"
"github.com/GoogleCloudPlatform/k8s-cloud-provider/pkg/cloud/meta"
"google.golang.org/api/compute/v1"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/tools/record"
"k8s.io/cloud-provider-gcp/providers/gce"
"k8s.io/ingress-gce/pkg/flags"
"k8s.io/ingress-gce/pkg/network"
"k8s.io/ingress-gce/pkg/utils"
"k8s.io/klog/v2"
)
// FirewallParams holds all data needed to create firewall for L4 LB
type FirewallParams struct {
Name string
IP string
SourceRanges []string
DestinationRanges []string
PortRanges []string
NodeNames []string
Protocol string
L4Type utils.L4LBType
Network network.NetworkInfo
}
func EnsureL4FirewallRule(cloud *gce.Cloud, nsName string, params *FirewallParams, sharedRule bool, fwLogger klog.Logger) error {
fwLogger = fwLogger.WithValues("l4Type", params.L4Type.ToString())
fa := NewFirewallAdapter(cloud)
existingFw, err := fa.GetFirewall(params.Name)
if err != nil && !utils.IsNotFoundError(err) {
return err
}
nodeTags, err := cloud.GetNodeTags(params.NodeNames)
if err != nil {
return err
}
fwDesc, err := utils.MakeL4LBFirewallDescription(nsName, params.IP, meta.VersionGA, sharedRule)
if err != nil {
fwLogger.Info("EnsureL4FirewallRule: failed to generate description for L4 rule", "err", err)
}
expectedFw := &compute.Firewall{
Name: params.Name,
Description: fwDesc,
Network: params.Network.NetworkURL,
SourceRanges: params.SourceRanges,
TargetTags: nodeTags,
Allowed: []*compute.FirewallAllowed{
{
IPProtocol: strings.ToLower(params.Protocol),
Ports: params.PortRanges,
},
},
}
if flags.F.EnablePinhole {
expectedFw.DestinationRanges = params.DestinationRanges
}
if existingFw == nil {
fwLogger.V(2).Info("EnsureL4FirewallRule: creating L4 firewall rule")
err = fa.CreateFirewall(expectedFw)
if utils.IsForbiddenError(err) && cloud.OnXPN() {
gcloudCmd := gce.FirewallToGCloudCreateCmd(expectedFw, cloud.NetworkProjectID())
fwLogger.V(3).Info("EnsureL4FirewallRule: Could not create L4 firewall on XPN cluster. Raising event for cmd", "err", err, "gcloudCmd", gcloudCmd)
return newFirewallXPNError(err, gcloudCmd)
}
return err
}
// Don't compare the "description" field for shared firewall rules
if firewallRuleEqual(expectedFw, existingFw, sharedRule) {
return nil
}
fwLogger.V(2).Info("EnsureL4FirewallRule: patching L4 firewall")
err = fa.PatchFirewall(expectedFw)
if utils.IsForbiddenError(err) && cloud.OnXPN() {
gcloudCmd := gce.FirewallToGCloudUpdateCmd(expectedFw, cloud.NetworkProjectID())
fwLogger.V(3).Info("EnsureL4FirewallRule: Could not patch L4 firewall on XPN cluster. Raising event for cmd", "err", err, "gcloudCmd", gcloudCmd)
return newFirewallXPNError(err, gcloudCmd)
}
return err
}
func EnsureL4FirewallRuleDeleted(cloud *gce.Cloud, fwName string, fwLogger klog.Logger) error {
fa := NewFirewallAdapter(cloud)
if err := utils.IgnoreHTTPNotFound(fa.DeleteFirewall(fwName)); err != nil {
if utils.IsForbiddenError(err) && cloud.OnXPN() {
gcloudCmd := gce.FirewallToGCloudDeleteCmd(fwName, cloud.NetworkProjectID())
fwLogger.V(3).Info("EnsureL4FirewallRuleDeleted: could not delete traffic firewall on XPN cluster. Raising event.", "err", err, "gcloudCmd", gcloudCmd)
return newFirewallXPNError(err, gcloudCmd)
}
return err
}
return nil
}
func firewallRuleEqual(a, b *compute.Firewall, skipDescription bool) bool {
if len(a.Allowed) != len(b.Allowed) {
return false
}
for i := range a.Allowed {
if !allowRulesEqual(a.Allowed[i], b.Allowed[i]) {
return false
}
}
if !utils.EqualStringSets(a.DestinationRanges, b.DestinationRanges) {
return false
}
if !utils.EqualStringSets(a.SourceRanges, b.SourceRanges) {
return false
}
if !utils.EqualStringSets(a.TargetTags, b.TargetTags) {
return false
}
if !skipDescription && a.Description != b.Description {
return false
}
return true
}
func allowRulesEqual(a *compute.FirewallAllowed, b *compute.FirewallAllowed) bool {
return a.IPProtocol == b.IPProtocol &&
utils.EqualStringSets(a.Ports, b.Ports)
}
func ensureFirewall(svc *v1.Service, shared bool, params *FirewallParams, cloud *gce.Cloud, recorder record.EventRecorder, fwLogger klog.Logger) error {
nsName := utils.ServiceKeyFunc(svc.Namespace, svc.Name)
err := EnsureL4FirewallRule(cloud, nsName, params, shared, fwLogger)
if err != nil {
if fwErr, ok := err.(*FirewallXPNError); ok {
recorder.Eventf(svc, v1.EventTypeNormal, "XPN", fwErr.Message)
return nil
}
return err
}
return nil
}
// EnsureL4LBFirewallForHc creates or updates firewall rule for shared or non-shared health check to nodes
func EnsureL4LBFirewallForHc(svc *v1.Service, shared bool, params *FirewallParams, cloud *gce.Cloud, recorder record.EventRecorder, fwLogger klog.Logger) error {
return ensureFirewall(svc, shared, params, cloud, recorder, fwLogger)
}
// EnsureL4LBFirewallForNodes creates or updates firewall rule for LB traffic to nodes
func EnsureL4LBFirewallForNodes(svc *v1.Service, params *FirewallParams, cloud *gce.Cloud, recorder record.EventRecorder, fwLogger klog.Logger) error {
return ensureFirewall(svc /*shared = */, false, params, cloud, recorder, fwLogger)
}