/
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 ipam
import (
"bytes"
"encoding/json"
"fmt"
"net"
"strings"
admv1 "k8s.io/api/admission/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog/v2"
crdv1alpha2 "antrea.io/antrea/pkg/apis/crd/v1alpha2"
)
func ValidateIPPool(review *admv1.AdmissionReview) *admv1.AdmissionResponse {
var msg string
allowed := true
klog.V(2).Info("Validating IPPool", "request", review.Request)
var newObj, oldObj crdv1alpha2.IPPool
if review.Request.Object.Raw != nil {
if err := json.Unmarshal(review.Request.Object.Raw, &newObj); err != nil {
klog.ErrorS(err, "Error de-serializing current IPPool")
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 IPPool")
return newAdmissionResponseForErr(err)
}
}
switch review.Request.Operation {
case admv1.Create:
klog.V(2).Info("Validating CREATE request for IPPool")
// Validate individual ranges
for _, r := range newObj.Spec.IPRanges {
allowed, msg = validateIPRange(r, newObj.Spec.IPVersion)
if !allowed {
return validationResult(allowed, msg)
}
}
// Validate that the added ipRanges do not overlap
for i, r1 := range newObj.Spec.IPRanges[0 : len(newObj.Spec.IPRanges)-1] {
for _, r2 := range newObj.Spec.IPRanges[i+1 : len(newObj.Spec.IPRanges)] {
if rangesOverlap(r1, r2) {
msg = fmt.Sprintf("IPRanges %s overlap", humanReadableIPRanges([]crdv1alpha2.SubnetIPRange{r1, r2}))
return validationResult(false, msg)
}
}
}
case admv1.Update:
klog.V(2).Info("Validating UPDATE request for IPPool")
deletedIPRanges := getIPRangeDifference(oldObj.Spec.IPRanges, newObj.Spec.IPRanges)
if len(deletedIPRanges) > 0 {
msg = fmt.Sprintf("existing IPRanges %s cannot be updated or deleted", humanReadableIPRanges(deletedIPRanges))
return validationResult(false, msg)
}
addedIPRanges := getIPRangeDifference(newObj.Spec.IPRanges, oldObj.Spec.IPRanges)
for _, r1 := range addedIPRanges {
allowed, msg = validateIPRange(r1, newObj.Spec.IPVersion)
if !allowed {
return validationResult(allowed, msg)
}
for _, r2 := range newObj.Spec.IPRanges {
if r1 != r2 && rangesOverlap(r1, r2) {
msg = fmt.Sprintf("IPRanges %s overlap",
humanReadableIPRanges([]crdv1alpha2.SubnetIPRange{r1, r2}))
return validationResult(false, msg)
}
}
}
case admv1.Delete:
klog.V(2).Info("Validating DELETE request for IPPool")
if len(oldObj.Status.IPAddresses) > 0 {
allowed = false
msg = fmt.Sprintf("IPPool in use cannot be deleted")
}
}
return validationResult(allowed, msg)
}
func validationResult(allowed bool, msg string) *admv1.AdmissionResponse {
var result *metav1.Status
if msg != "" {
result = &metav1.Status{
Message: msg,
}
}
return &admv1.AdmissionResponse{
Allowed: allowed,
Result: result,
}
}
// getIPRangeDifference returns SubnetIPRanges that are in s1 but not in s2.
func getIPRangeDifference(s1, s2 []crdv1alpha2.SubnetIPRange) []crdv1alpha2.SubnetIPRange {
newSet := map[crdv1alpha2.SubnetIPRange]struct{}{}
for _, ipRange := range s2 {
newSet[ipRange] = struct{}{}
}
var difference []crdv1alpha2.SubnetIPRange
for _, ipRange := range s1 {
if _, exists := newSet[ipRange]; exists {
continue
}
difference = append(difference, ipRange)
}
return difference
}
func humanReadableIPRanges(ipRanges []crdv1alpha2.SubnetIPRange) string {
strs := make([]string, len(ipRanges))
for i, ipRange := range ipRanges {
if ipRange.CIDR != "" {
strs[i] = ipRange.CIDR
} else {
strs[i] = fmt.Sprintf("%s-%s", ipRange.Start, ipRange.End)
}
}
return fmt.Sprintf("[%s]", strings.Join(strs, ","))
}
func rangesOverlap(r1, r2 crdv1alpha2.SubnetIPRange) bool {
if r1.CIDR == "" {
if r2.CIDR == "" {
r1start := net.ParseIP(r1.Start)
r1end := net.ParseIP(r1.End)
r2start := net.ParseIP(r2.Start)
r2end := net.ParseIP(r2.End)
if ipInRange(r1start, r1end, r2start) || ipInRange(r2start, r2end, r1start) {
return true
}
} else {
_, cidr2, _ := net.ParseCIDR(r2.CIDR)
r1start := net.ParseIP(r1.Start)
r1end := net.ParseIP(r1.End)
if cidr2.Contains(r1start) || cidr2.Contains(r1end) {
return true
}
return ipInRange(r1start, r1end, cidr2.IP)
}
} else {
_, cidr1, _ := net.ParseCIDR(r1.CIDR)
if r2.CIDR == "" {
r2start := net.ParseIP(r2.Start)
r2end := net.ParseIP(r2.End)
if cidr1.Contains(r2start) || cidr1.Contains(r2end) {
return true
}
return ipInRange(r2start, r2end, cidr1.IP)
} else {
_, cidr2, _ := net.ParseCIDR(r2.CIDR)
return cidr1.Contains(cidr2.IP) || cidr2.Contains(cidr1.IP)
}
}
return false
}
func ipInRange(rangeStart, rangeEnd, ip net.IP) bool {
// Validate that ip is within start and end of range
ip16 := ip.To16()
return bytes.Compare(ip16, rangeStart.To16()) >= 0 && bytes.Compare(ip16, rangeEnd.To16()) <= 0
}
func ipVersion(ip net.IP) crdv1alpha2.IPVersion {
if ip.To4() != nil {
return crdv1alpha2.IPv4
}
return crdv1alpha2.IPv6
}
func validateIPRange(r crdv1alpha2.SubnetIPRange, poolIPVersion crdv1alpha2.IPVersion) (bool, string) {
if poolIPVersion == crdv1alpha2.IPv4 {
if r.PrefixLength <= 0 || r.PrefixLength >= 32 {
return false, fmt.Sprintf("Invalid prefix length %d", r.PrefixLength)
}
} else if poolIPVersion == crdv1alpha2.IPv6 {
if r.PrefixLength <= 0 || r.PrefixLength >= 128 {
return false, fmt.Sprintf("Invalid prefix length %d", r.PrefixLength)
}
} else {
return false, fmt.Sprintf("Invalid IP version %d", int(poolIPVersion))
}
// Validate the integrity the IP range:
// Verify that all the IP ranges have the same IP family as the IP pool
// Verify that the gateway IP is reachable from the IP range
gateway := net.ParseIP(r.Gateway)
var mask net.IPMask
if ipVersion(gateway) == crdv1alpha2.IPv4 {
mask = net.CIDRMask(int(r.PrefixLength), 32)
} else {
mask = net.CIDRMask(int(r.PrefixLength), 128)
}
netCIDR := net.IPNet{IP: gateway, Mask: mask}
if r.CIDR != "" {
_, cidr, _ := net.ParseCIDR(r.CIDR)
if ipVersion(cidr.IP) != poolIPVersion {
return false, fmt.Sprintf(
"Range is invalid. IP version of range %s differs from Pool IP version", r.CIDR)
}
if !netCIDR.Contains(cidr.IP) {
return false, fmt.Sprintf(
"Range is invalid. CIDR %s is not contained within subnet %s/%d",
r.CIDR, netCIDR.IP.String(), r.PrefixLength)
}
} else {
rStart := net.ParseIP(r.Start)
rEnd := net.ParseIP(r.End)
if ipVersion(rStart) != poolIPVersion || ipVersion(rEnd) != poolIPVersion {
return false, fmt.Sprintf(
"Range is invalid. IP version of range %s-%s differs from Pool IP version", r.Start, r.End)
}
if !netCIDR.Contains(rStart) || !netCIDR.Contains(rEnd) {
return false, fmt.Sprintf(
"Range is invalid. range %s-%s is not contained within subnet %s/%d",
r.Start, r.End, netCIDR.IP.String(), r.PrefixLength)
}
}
return true, ""
}
func newAdmissionResponseForErr(err error) *admv1.AdmissionResponse {
return &admv1.AdmissionResponse{
Result: &metav1.Status{
Message: err.Error(),
},
}
}