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ippool_webhook.go
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/
ippool_webhook.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 v1alpha1
import (
"net"
"net/netip"
"reflect"
"github.com/pkg/errors"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/webhook"
"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
)
func (c *IPPool) SetupWebhookWithManager(mgr ctrl.Manager) error {
return ctrl.NewWebhookManagedBy(mgr).
For(c).
Complete()
}
// +kubebuilder:webhook:verbs=create;update,path=/validate-ipam-metal3-io-v1alpha1-ippool,mutating=false,failurePolicy=fail,groups=ipam.metal3.io,resources=ippools,versions=v1alpha1,name=validation.ippool.ipam.metal3.io,matchPolicy=Equivalent,sideEffects=None,admissionReviewVersions=v1;v1beta1
// +kubebuilder:webhook:verbs=create;update,path=/mutate-ipam-metal3-io-v1alpha1-ippool,mutating=true,failurePolicy=fail,groups=ipam.metal3.io,resources=ippools,versions=v1alpha1,name=default.ippool.ipam.metal3.io,matchPolicy=Equivalent,sideEffects=None,admissionReviewVersions=v1;v1beta1
var _ webhook.Defaulter = &IPPool{}
var _ webhook.Validator = &IPPool{}
func (c *IPPool) Default() {
}
// ValidateCreate implements webhook.Validator so a webhook will be registered for the type.
func (c *IPPool) ValidateCreate() (admission.Warnings, error) {
return c.validate()
}
// ValidateUpdate implements webhook.Validator so a webhook will be registered for the type.
func (c *IPPool) ValidateUpdate(old runtime.Object) (admission.Warnings, error) {
allErrs := field.ErrorList{}
oldM3ipp, ok := old.(*IPPool)
if !ok || oldM3ipp == nil {
return nil, apierrors.NewInternalError(errors.New("unable to convert existing object"))
}
if !reflect.DeepEqual(c.Spec.NamePrefix, oldM3ipp.Spec.NamePrefix) {
allErrs = append(allErrs,
field.Invalid(
field.NewPath("spec", "NamePrefix"),
c.Spec.NamePrefix,
"cannot be modified",
),
)
}
allocationOutOfBonds, inUseOutOfBonds := c.checkPoolBonds(oldM3ipp)
if len(allocationOutOfBonds) != 0 {
for _, address := range allocationOutOfBonds {
allErrs = append(allErrs,
field.Invalid(
field.NewPath("spec", "preAllocations"),
address,
"is out of bonds of the pools given",
),
)
}
}
if len(inUseOutOfBonds) != 0 {
for _, address := range inUseOutOfBonds {
allErrs = append(allErrs,
field.Invalid(
field.NewPath("spec", "pools"),
address,
"is in use but out of bonds of the pools given",
),
)
}
}
if len(allErrs) == 0 {
return nil, nil
}
return nil, apierrors.NewInvalid(GroupVersion.WithKind("Metal3Data").GroupKind(), c.Name, allErrs)
}
func (c *IPPool) checkPoolBonds(old *IPPool) ([]IPAddressStr, []IPAddressStr) {
allocationOutOfBonds := []IPAddressStr{}
inUseOutOfBonds := []IPAddressStr{}
for _, address := range c.Spec.PreAllocations {
inBonds := c.isAddressInBonds(address)
if !inBonds {
allocationOutOfBonds = append(allocationOutOfBonds, address)
}
}
for _, address := range old.Status.Allocations {
inBonds := c.isAddressInBonds(address)
if !inBonds {
inUseOutOfBonds = append(inUseOutOfBonds, address)
}
}
return allocationOutOfBonds, inUseOutOfBonds
}
func (c *IPPool) isAddressInBonds(address IPAddressStr) bool {
ip, err := netip.ParseAddr(string(address))
if err != nil {
return false
}
for _, pool := range c.Spec.Pools {
if pool.Start != nil {
startIP, err := netip.ParseAddr(string(*pool.Start))
if err != nil {
// skip this invalid pool, as the validation error should be caught somewhere else
continue
}
if startIP.Compare(ip) > 0 {
continue
}
}
if pool.End != nil {
endIP, err := netip.ParseAddr(string(*pool.End))
if err != nil {
// skip this invalid pool, as the validation error should be caught somewhere else
continue
}
if endIP.Compare(ip) < 0 {
continue
}
}
if pool.Subnet != nil {
_, subnet, err := net.ParseCIDR(string(*pool.Subnet))
if err != nil {
// skip this invalid pool, as the validation error should be caught somewhere else
continue
}
if !subnet.Contains(net.ParseIP(ip.String())) {
continue
}
}
return true
}
return false
}
// ValidateDelete implements webhook.Validator so a webhook will be registered for the type.
func (c *IPPool) ValidateDelete() (admission.Warnings, error) {
return nil, nil
}
// No further validation for now.
func (c *IPPool) validate() (admission.Warnings, error) {
var allErrs field.ErrorList
if len(allErrs) == 0 {
return nil, nil
}
return nil, apierrors.NewInvalid(GroupVersion.WithKind("IPPool").GroupKind(), c.Name, allErrs)
}