mirror of https://github.com/k3s-io/k3s
55 lines
1.7 KiB
Go
55 lines
1.7 KiB
Go
|
/*
|
||
|
|
Copyright 2016 The Kubernetes Authors All rights reserved.
|
||
|
|
|
||
|
|
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 service
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"strings"
|
||
|
|
|
||
|
|
netsets "k8s.io/kubernetes/pkg/util/net/sets"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
defaultLoadBalancerSourceRanges = "0.0.0.0/0"
|
||
|
|
)
|
||
|
|
|
||
|
|
// IsAllowAll checks whether the netsets.IPNet allows traffic from 0.0.0.0/0
|
||
|
|
func IsAllowAll(ipnets netsets.IPNet) bool {
|
||
|
|
for _, s := range ipnets.StringSlice() {
|
||
|
|
if s == "0.0.0.0/0" {
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
|
||
|
|
// GetLoadBalancerSourceRanges verifies and parses the AnnotationLoadBalancerSourceRangesKey annotation from a service,
|
||
|
|
// extracting the source ranges to allow, and if not present returns a default (allow-all) value.
|
||
|
|
func GetLoadBalancerSourceRanges(annotations map[string]string) (netsets.IPNet, error) {
|
||
|
|
val := annotations[AnnotationLoadBalancerSourceRangesKey]
|
||
|
|
val = strings.TrimSpace(val)
|
||
|
|
if val == "" {
|
||
|
|
val = defaultLoadBalancerSourceRanges
|
||
|
|
}
|
||
|
|
specs := strings.Split(val, ",")
|
||
|
|
ipnets, err := netsets.ParseIPNets(specs...)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("Service annotation %s:%s is not valid. Expecting a comma-separated list of source IP ranges. For example, 10.0.0.0/24,192.168.2.0/24", AnnotationLoadBalancerSourceRangesKey, val)
|
||
|
|
}
|
||
|
|
return ipnets, nil
|
||
|
|
}
|