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This refactors #21431 to pull a lot of the code into cloudprovider so it can be reused by AWS. It also changes the name of the annotation to be non-GCE specific: service.beta.kubernetes.io/load-balancer-source-ranges Fix #21651
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cloudprovider
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import (
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"fmt"
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"net"
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"strings"
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)
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const (
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defaultLBSourceRange = "0.0.0.0/0"
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)
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type IPNetSet map[string]*net.IPNet
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func ParseIPNetSet(specs []string) (IPNetSet, error) {
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ipnetset := make(IPNetSet)
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for _, spec := range specs {
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spec = strings.TrimSpace(spec)
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_, ipnet, err := net.ParseCIDR(spec)
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if err != nil {
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return nil, err
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}
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k := ipnet.String() // In case of normalization
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ipnetset[k] = ipnet
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}
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return ipnetset, nil
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}
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// StringSlice returns a []string with the String representation of each element in the set.
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// Order is undefined.
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func (s IPNetSet) StringSlice() []string {
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a := make([]string, 0, len(s))
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for k := range s {
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a = append(a, k)
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}
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return a
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}
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// Equal checks if two IPNetSets are equal (ignoring order)
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func (l IPNetSet) Equal(r IPNetSet) bool {
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if len(l) != len(r) {
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return false
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}
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for k := range l {
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_, found := r[k]
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if !found {
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return false
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}
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}
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return true
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}
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// GetSourceRangeAnnotations verifies and parses the LBAnnotationAllowSourceRange annotation from a service,
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// extracting the source ranges to allow, and if not present returns a default (allow-all) value.
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func GetSourceRangeAnnotations(annotation map[string]string) (IPNetSet, error) {
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val := annotation[LBAnnotationAllowSourceRange]
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val = strings.TrimSpace(val)
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if val == "" {
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val = defaultLBSourceRange
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}
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specs := strings.Split(val, ",")
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ipnets, err := ParseIPNetSet(specs)
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if err != nil {
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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", LBAnnotationAllowSourceRange, val)
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}
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return ipnets, nil
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}
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