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validate.go
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validate.go
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// Copyright 2021 Antrea 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 externalippool
import (
"encoding/json"
"fmt"
"net"
admv1 "k8s.io/api/admission/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/klog/v2"
crdv1beta1 "antrea.io/antrea/pkg/apis/crd/v1beta1"
"antrea.io/antrea/pkg/util/ip"
)
func (c *ExternalIPPoolController) ValidateExternalIPPool(review *admv1.AdmissionReview) *admv1.AdmissionResponse {
var result *metav1.Status
var msg string
allowed := true
klog.V(2).Info("Validating ExternalIPPool", "request", review.Request)
var newObj, oldObj crdv1beta1.ExternalIPPool
if review.Request.Object.Raw != nil {
if err := json.Unmarshal(review.Request.Object.Raw, &newObj); err != nil {
klog.ErrorS(err, "Error de-serializing current ExternalIPPool")
return newAdmissionResponseForErr(err)
}
}
if review.Request.OldObject.Raw != nil {
if err := json.Unmarshal(review.Request.OldObject.Raw, &oldObj); err != nil {
klog.ErrorS(err, "Error de-serializing old ExternalIPPool")
return newAdmissionResponseForErr(err)
}
}
switch review.Request.Operation {
case admv1.Create:
klog.V(2).Info("Validating CREATE request for ExternalIPPool")
if msg, allowed = validateIPRangesAndSubnetInfo(newObj.Spec.IPRanges, newObj.Spec.SubnetInfo); !allowed {
break
}
case admv1.Update:
klog.V(2).Info("Validating UPDATE request for ExternalIPPool")
if msg, allowed = validateIPRangesAndSubnetInfo(newObj.Spec.IPRanges, newObj.Spec.SubnetInfo); !allowed {
break
}
oldIPRangeSet := getIPRangeSet(oldObj.Spec.IPRanges)
newIPRangeSet := getIPRangeSet(newObj.Spec.IPRanges)
deletedIPRanges := oldIPRangeSet.Difference(newIPRangeSet)
if deletedIPRanges.Len() > 0 {
allowed = false
msg = fmt.Sprintf("existing IPRanges %v cannot be deleted", sets.List(deletedIPRanges))
}
case admv1.Delete:
// This shouldn't happen with the webhook configuration we include in the Antrea YAML manifests.
klog.V(2).Info("Validating DELETE request for ExternalIPPool")
// Always allow DELETE request.
}
if msg != "" {
result = &metav1.Status{
Message: msg,
}
}
return &admv1.AdmissionResponse{
Allowed: allowed,
Result: result,
}
}
func validateIPRangesAndSubnetInfo(ipRanges []crdv1beta1.IPRange, subnetInfo *crdv1beta1.SubnetInfo) (string, bool) {
if subnetInfo == nil {
return "", true
}
gatewayIP := net.ParseIP(subnetInfo.Gateway)
var mask net.IPMask
if gatewayIP.To4() != nil {
if subnetInfo.PrefixLength <= 0 || subnetInfo.PrefixLength >= 32 {
return fmt.Sprintf("invalid prefixLength %d", subnetInfo.PrefixLength), false
}
mask = net.CIDRMask(int(subnetInfo.PrefixLength), 32)
} else {
if subnetInfo.PrefixLength <= 0 || subnetInfo.PrefixLength >= 128 {
return fmt.Sprintf("invalid prefixLength %d", subnetInfo.PrefixLength), false
}
mask = net.CIDRMask(int(subnetInfo.PrefixLength), 128)
}
subnet := &net.IPNet{
IP: gatewayIP.Mask(mask),
Mask: mask,
}
for _, ipRange := range ipRanges {
if ipRange.CIDR != "" {
_, cidr, err := net.ParseCIDR(ipRange.CIDR)
if err != nil {
return err.Error(), false
}
if !ip.IPNetContains(subnet, cidr) {
return fmt.Sprintf("cidr %s must be a strict subset of the subnet", ipRange.CIDR), false
}
} else {
start := net.ParseIP(ipRange.Start)
end := net.ParseIP(ipRange.End)
if !subnet.Contains(start) || !subnet.Contains(end) {
return fmt.Sprintf("IP range %s-%s must be a strict subset of the subnet", ipRange.Start, ipRange.End), false
}
}
}
return "", true
}
func getIPRangeSet(ipRanges []crdv1beta1.IPRange) sets.Set[string] {
set := sets.New[string]()
for _, ipRange := range ipRanges {
ipRangeStr := ipRange.CIDR
if ipRangeStr == "" {
ipRangeStr = fmt.Sprintf("%s-%s", ipRange.Start, ipRange.End)
}
set.Insert(ipRangeStr)
}
return set
}
func newAdmissionResponseForErr(err error) *admv1.AdmissionResponse {
return &admv1.AdmissionResponse{
Result: &metav1.Status{
Message: err.Error(),
},
}
}