mirror of https://github.com/k3s-io/k3s
86 lines
2.9 KiB
Go
86 lines
2.9 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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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 service
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import (
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"fmt"
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api "k8s.io/kubernetes/pkg/apis/core"
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netsets "k8s.io/kubernetes/pkg/util/net/sets"
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"strings"
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)
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const (
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defaultLoadBalancerSourceRanges = "0.0.0.0/0"
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)
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// IsAllowAll checks whether the netsets.IPNet allows traffic from 0.0.0.0/0
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func IsAllowAll(ipnets netsets.IPNet) bool {
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for _, s := range ipnets.StringSlice() {
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if s == "0.0.0.0/0" {
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return true
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}
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}
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return false
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}
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// GetLoadBalancerSourceRanges first try to parse and verify LoadBalancerSourceRanges field from a service.
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// If the field is not specified, turn to parse and verify the AnnotationLoadBalancerSourceRangesKey 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 GetLoadBalancerSourceRanges(service *api.Service) (netsets.IPNet, error) {
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var ipnets netsets.IPNet
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var err error
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// if SourceRange field is specified, ignore sourceRange annotation
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if len(service.Spec.LoadBalancerSourceRanges) > 0 {
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specs := service.Spec.LoadBalancerSourceRanges
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ipnets, err = netsets.ParseIPNets(specs...)
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if err != nil {
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return nil, fmt.Errorf("service.Spec.LoadBalancerSourceRanges: %v is not valid. Expecting a list of IP ranges. For example, 10.0.0.0/24. Error msg: %v", specs, err)
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}
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} else {
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val := service.Annotations[api.AnnotationLoadBalancerSourceRangesKey]
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val = strings.TrimSpace(val)
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if val == "" {
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val = defaultLoadBalancerSourceRanges
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}
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specs := strings.Split(val, ",")
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ipnets, err = netsets.ParseIPNets(specs...)
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if err != nil {
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return nil, fmt.Errorf("%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", api.AnnotationLoadBalancerSourceRangesKey, val)
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}
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}
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return ipnets, nil
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}
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// RequestsOnlyLocalTraffic checks if service requests OnlyLocal traffic.
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func RequestsOnlyLocalTraffic(service *api.Service) bool {
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if service.Spec.Type != api.ServiceTypeLoadBalancer &&
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service.Spec.Type != api.ServiceTypeNodePort {
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return false
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}
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return service.Spec.ExternalTrafficPolicy == api.ServiceExternalTrafficPolicyTypeLocal
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}
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// NeedsHealthCheck checks if service needs health check.
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func NeedsHealthCheck(service *api.Service) bool {
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if service.Spec.Type != api.ServiceTypeLoadBalancer {
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return false
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}
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return RequestsOnlyLocalTraffic(service)
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}
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