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globalnet.go
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/
globalnet.go
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/*
Copyright 2021.
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 globalnet
import (
"encoding/binary"
"encoding/json"
"fmt"
"math/bits"
"net"
"k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/api/core/v1"
"k8s.io/klog/v2"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/DanielXLee/cluster-fabric-operator/controllers/ensures/broker"
)
type GlobalnetInfo struct {
GlobalnetEnabled bool
GlobalnetCidrRange string
GlobalnetClusterSize uint
GlobalCidrInfo map[string]*GlobalNetwork
}
type GlobalNetwork struct {
GlobalCIDRs []string
ClusterID string
}
type GlobalCIDR struct {
cidr string
net *net.IPNet
allocatedClusters []*CIDR
allocatedCount int
}
type CIDR struct {
network *net.IPNet
size int
lastIP uint
}
type Config struct {
ClusterCIDR string
ClusterID string
GlobalnetCIDR string
ServiceCIDR string
GlobalnetClusterSize uint
ClusterCIDRAutoDetected bool
ServiceCIDRAutoDetected bool
}
var globalCidr = GlobalCIDR{allocatedCount: 0}
func isOverlappingCIDR(cidrList []string, cidr string) (bool, error) {
_, newNet, err := net.ParseCIDR(cidr)
if err != nil {
return false, err
}
for _, v := range cidrList {
_, baseNet, err := net.ParseCIDR(v)
if err != nil {
return false, err
}
if baseNet.Contains(newNet.IP) || newNet.Contains(baseNet.IP) {
return true, nil
}
}
return false, nil
}
func NewCIDR(cidr string) (CIDR, error) {
_, network, err := net.ParseCIDR(cidr)
if err != nil {
return CIDR{}, fmt.Errorf("invalid cidr %q passed as input", cidr)
}
ones, total := network.Mask.Size()
size := total - ones
lastIP := LastIP(network)
clusterCidr := CIDR{network: network, size: size, lastIP: lastIP}
return clusterCidr, nil
}
func LastIP(network *net.IPNet) uint {
ones, total := network.Mask.Size()
clusterSize := uint(total - ones)
firstIPInt := ipToUint(network.IP)
lastIPUint := (firstIPInt + 1<<clusterSize) - 1
return lastIPUint
}
func allocateByCidr(cidr string) (uint, error) {
requestedIP, requestedNetwork, err := net.ParseCIDR(cidr)
if err != nil || !globalCidr.net.Contains(requestedIP) {
return 0, fmt.Errorf("%s not a valid subnet of %v", cidr, globalCidr.net)
}
var clusterCidr CIDR
if clusterCidr, err = NewCIDR(cidr); err != nil {
return 0, err
}
if !globalCidr.net.Contains(uintToIP(clusterCidr.lastIP)) {
return 0, fmt.Errorf("%s not a valid subnet of %v", cidr, globalCidr.net)
}
for i := 0; i < globalCidr.allocatedCount; i++ {
allocated := globalCidr.allocatedClusters[i]
if allocated.network.Contains(requestedIP) {
// subset of already allocated, try next
return allocated.lastIP, fmt.Errorf("%s subset of already allocated globalCidr %v", cidr, allocated.network)
}
if requestedNetwork.Contains(allocated.network.IP) {
// already allocated is subset of requested, no valid lastIP
return clusterCidr.lastIP, fmt.Errorf("%s overlaps with already allocated globalCidr %s", cidr, allocated.network)
}
}
globalCidr.allocatedClusters = append(globalCidr.allocatedClusters, &clusterCidr)
globalCidr.allocatedCount++
return 0, nil
}
func allocateByClusterSize(numSize uint) (string, error) {
bitSize := bits.LeadingZeros(0) - bits.LeadingZeros(numSize-1)
_, totalbits := globalCidr.net.Mask.Size()
clusterPrefix := totalbits - bitSize
mask := net.CIDRMask(clusterPrefix, totalbits)
cidr := fmt.Sprintf("%s/%d", globalCidr.net.IP, clusterPrefix)
last, err := allocateByCidr(cidr)
if err != nil && last == 0 {
return "", err
}
for err != nil {
nextNet := net.IPNet{
IP: uintToIP(last + 1),
Mask: mask,
}
cidr = nextNet.String()
last, err = allocateByCidr(cidr)
if err != nil && last == 0 {
return "", fmt.Errorf("allocation not available")
}
}
return cidr, nil
}
func AllocateGlobalCIDR(globalnetInfo *GlobalnetInfo) (string, error) {
globalCidr = GlobalCIDR{allocatedCount: 0, cidr: globalnetInfo.GlobalnetCidrRange}
_, network, err := net.ParseCIDR(globalCidr.cidr)
if err != nil {
return "", fmt.Errorf("invalid GlobalCIDR %s configured", globalCidr.cidr)
}
globalCidr.net = network
for _, globalNetwork := range globalnetInfo.GlobalCidrInfo {
for _, otherCluster := range globalNetwork.GlobalCIDRs {
otherClusterCIDR, err := NewCIDR(otherCluster)
if err != nil {
return "", err
}
globalCidr.allocatedClusters = append(globalCidr.allocatedClusters, &otherClusterCIDR)
globalCidr.allocatedCount++
}
}
return allocateByClusterSize(globalnetInfo.GlobalnetClusterSize)
}
func ipToUint(ip net.IP) uint {
intIP := ip
if len(ip) == 16 {
intIP = ip[12:16]
}
return uint(binary.BigEndian.Uint32(intIP))
}
func uintToIP(ip uint) net.IP {
netIP := make(net.IP, 4)
binary.BigEndian.PutUint32(netIP, uint32(ip))
return netIP
}
func GetValidClusterSize(cidrRange string, clusterSize uint) (uint, error) {
_, network, err := net.ParseCIDR(cidrRange)
if err != nil {
return 0, err
}
ones, totalbits := network.Mask.Size()
availableSize := 1 << uint(totalbits-ones)
userClusterSize := clusterSize
clusterSize = nextPowerOf2(uint32(clusterSize))
if clusterSize > uint(availableSize/2) {
return 0, fmt.Errorf("cluster size %d, should be <= %d", userClusterSize, availableSize/2)
}
return clusterSize, nil
}
//Refer: https://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
func nextPowerOf2(n uint32) uint {
n--
n |= n >> 1
n |= n >> 2
n |= n >> 4
n |= n >> 8
n |= n >> 16
n++
return uint(n)
}
func CheckOverlappingCidrs(globalnetInfo *GlobalnetInfo, netconfig Config) error {
var cidrlist []string
var cidr string
for k, v := range globalnetInfo.GlobalCidrInfo {
cidrlist = v.GlobalCIDRs
cidr = netconfig.GlobalnetCIDR
overlap, err := isOverlappingCIDR(cidrlist, cidr)
if err != nil {
return fmt.Errorf("unable to validate overlapping CIDR: %s", err)
}
if overlap && k != netconfig.ClusterID {
return fmt.Errorf("invalid CIDR %s overlaps with cluster %q", cidr, k)
}
}
return nil
}
func isCIDRPreConfigured(clusterID string, globalNetworks map[string]*GlobalNetwork) bool {
// GlobalCIDR is not pre-configured
if globalNetworks[clusterID] == nil || globalNetworks[clusterID].GlobalCIDRs == nil || len(globalNetworks[clusterID].GlobalCIDRs) == 0 {
return false
}
// GlobalCIDR is pre-configured
return true
}
func ValidateGlobalnetConfiguration(globalnetInfo *GlobalnetInfo, netconfig Config) (string, error) {
klog.Info("Validating Globalnet configurations")
globalnetClusterSize := netconfig.GlobalnetClusterSize
globalnetCIDR := netconfig.GlobalnetCIDR
if globalnetInfo.GlobalnetEnabled && globalnetClusterSize != 0 && globalnetClusterSize != globalnetInfo.GlobalnetClusterSize {
clusterSize, err := GetValidClusterSize(globalnetInfo.GlobalnetCidrRange, globalnetClusterSize)
if err != nil || clusterSize == 0 {
return "", fmt.Errorf("invalid globalnet-cluster-size %s", err)
}
globalnetInfo.GlobalnetClusterSize = clusterSize
}
if globalnetCIDR != "" && globalnetClusterSize != 0 {
return "", fmt.Errorf("both globalnet-cluster-size and globalnet-cidr can't be specified. Specify either one")
}
if globalnetCIDR != "" {
_, _, err := net.ParseCIDR(globalnetCIDR)
if err != nil {
return "", fmt.Errorf("specified globalnet-cidr is invalid: %s", err)
}
}
if !globalnetInfo.GlobalnetEnabled {
if globalnetCIDR != "" {
klog.Info("Globalnet is not enabled on Broker. Ignoring specified globalnet-cidr")
globalnetCIDR = ""
} else if globalnetClusterSize != 0 {
klog.Info("Globalnet is not enabled on Broker. Ignoring specified globalnet-cluster-size")
globalnetInfo.GlobalnetClusterSize = 0
}
}
return globalnetCIDR, nil
}
func GetGlobalNetworks(reader client.Reader, brokerNamespace string) (*GlobalnetInfo, *v1.ConfigMap, error) {
configMap, err := broker.GetGlobalnetConfigMap(reader, brokerNamespace)
if err != nil {
return nil, nil, err
}
globalnetInfo := GlobalnetInfo{}
err = json.Unmarshal([]byte(configMap.Data[broker.GlobalnetStatusKey]), &globalnetInfo.GlobalnetEnabled)
if err != nil {
klog.Errorf("error reading globalnetEnabled status: %v", err)
return nil, nil, err
}
if globalnetInfo.GlobalnetEnabled {
err = json.Unmarshal([]byte(configMap.Data[broker.GlobalnetClusterSize]), &globalnetInfo.GlobalnetClusterSize)
if err != nil {
klog.Errorf("error reading GlobalnetClusterSize: %v", err)
return nil, nil, err
}
err = json.Unmarshal([]byte(configMap.Data[broker.GlobalnetCidrRange]), &globalnetInfo.GlobalnetCidrRange)
if err != nil {
klog.Errorf("error reading GlobalnetCidrRange: %v", err)
return nil, nil, err
}
}
var clusterInfo []broker.ClusterInfo
err = json.Unmarshal([]byte(configMap.Data[broker.ClusterInfoKey]), &clusterInfo)
if err != nil {
klog.Errorf("error reading globalnet clusterInfo: %v", err)
return nil, nil, err
}
var globalNetworks = make(map[string]*GlobalNetwork)
for _, cluster := range clusterInfo {
globalNetwork := GlobalNetwork{
GlobalCIDRs: cluster.GlobalCidr,
ClusterID: cluster.ClusterID,
}
globalNetworks[cluster.ClusterID] = &globalNetwork
}
globalnetInfo.GlobalCidrInfo = globalNetworks
return &globalnetInfo, configMap, nil
}
func AssignGlobalnetIPs(globalnetInfo *GlobalnetInfo, netconfig Config) (string, error) {
klog.Info("Assigning Globalnet IPs")
globalnetCIDR := netconfig.GlobalnetCIDR
clusterID := netconfig.ClusterID
var err error
if globalnetCIDR == "" {
// Globalnet enabled, GlobalCIDR not specified by the user
if isCIDRPreConfigured(clusterID, globalnetInfo.GlobalCidrInfo) {
// globalCidr already configured on this cluster
globalnetCIDR = globalnetInfo.GlobalCidrInfo[clusterID].GlobalCIDRs[0]
klog.Infof("Cluster already has GlobalCIDR allocated: %s", globalnetCIDR)
} else {
// no globalCidr configured on this cluster
globalnetCIDR, err = AllocateGlobalCIDR(globalnetInfo)
if err != nil {
klog.Errorf("globalnet failed: %v", err)
return "", err
}
klog.Infof("Allocated GlobalCIDR: %s", globalnetCIDR)
}
} else {
// Globalnet enabled, globalnetCIDR specified by user
if isCIDRPreConfigured(clusterID, globalnetInfo.GlobalCidrInfo) {
// globalCidr pre-configured on this cluster
globalnetCIDR = globalnetInfo.GlobalCidrInfo[clusterID].GlobalCIDRs[0]
klog.Infof("Pre-configured GlobalCIDR %s detected. Not changing it.", globalnetCIDR)
} else {
// globalCidr as specified by the user
err := CheckOverlappingCidrs(globalnetInfo, netconfig)
if err != nil {
klog.Errorf("error validating overlapping GlobalCIDRs %s: %v", globalnetCIDR, err)
return "", err
}
klog.Infof("GlobalCIDR is: %s", globalnetCIDR)
}
}
return globalnetCIDR, nil
}
func IsValidCIDR(cidr string) error {
ip, _, err := net.ParseCIDR(cidr)
if err != nil {
return err
}
if ip.IsUnspecified() {
return fmt.Errorf("%s can't be unspecified", cidr)
}
if ip.IsLoopback() {
return fmt.Errorf("%s can't be in loopback range", cidr)
}
if ip.IsLinkLocalUnicast() {
return fmt.Errorf("%s can't be in link-local range", cidr)
}
if ip.IsLinkLocalMulticast() {
return fmt.Errorf("%s can't be in link-local multicast range", cidr)
}
return nil
}
func ValidateExistingGlobalNetworks(reader client.Reader, namespace string) error {
globalnetInfo, _, err := GetGlobalNetworks(reader, namespace)
if err != nil {
if errors.IsNotFound(err) {
return nil
}
klog.Errorf("error getting existing globalnet configmap: %v", err)
return err
}
if globalnetInfo != nil {
if err = IsValidCIDR(globalnetInfo.GlobalnetCidrRange); err != nil {
klog.Errorf("invalid GlobalnetCidrRange: %v", err)
return err
}
}
return nil
}