/
prefix_allocation.go
84 lines (68 loc) · 2.21 KB
/
prefix_allocation.go
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/*
Copyright 2022 The Kubermatic Kubernetes Platform contributors.
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 ipamcontroller
import (
"errors"
"fmt"
"net"
"k8s.io/apimachinery/pkg/util/sets"
)
func checkPrefixAllocation(subnetCIDR, poolCIDR string, allocationPrefix int) error {
subnetIP, subnet, err := net.ParseCIDR(subnetCIDR)
if err != nil {
return err
}
subnetPrefix, _ := subnet.Mask.Size()
if allocationPrefix != subnetPrefix {
return errIncompatiblePool
}
_, poolSubnet, err := net.ParseCIDR(poolCIDR)
if err != nil {
return err
}
poolPrefix, poolBits := poolSubnet.Mask.Size()
if subnetPrefix < poolPrefix {
return errIncompatiblePool
}
if subnetPrefix > poolBits {
return errIncompatiblePool
}
if !poolSubnet.Contains(subnetIP) {
return errIncompatiblePool
}
return nil
}
func findFirstFreeSubnetOfPool(poolName, poolCIDR string, subnetPrefix int, dcIPAMPoolUsageMap sets.Set[string]) (string, error) {
poolIP, poolSubnet, err := net.ParseCIDR(poolCIDR)
if err != nil {
return "", err
}
poolPrefix, bits := poolSubnet.Mask.Size()
if subnetPrefix < poolPrefix {
return "", errors.New("invalid prefix for subnet")
}
if subnetPrefix > bits {
return "", errors.New("invalid prefix for subnet")
}
_, possibleSubnet, err := net.ParseCIDR(fmt.Sprintf("%s/%d", poolIP.Mask(poolSubnet.Mask), subnetPrefix))
if err != nil {
return "", err
}
for ; poolSubnet.Contains(possibleSubnet.IP); possibleSubnet, _ = nextSubnet(possibleSubnet, subnetPrefix) {
if !dcIPAMPoolUsageMap.Has(possibleSubnet.String()) {
dcIPAMPoolUsageMap.Insert(possibleSubnet.String())
return possibleSubnet.String(), nil
}
}
return "", fmt.Errorf("there is no free subnet available for IPAM Pool \"%s\"", poolName)
}