e2900da46a
getLocalDetector() used to pass a utiliptables.Interface to NewDetectLocalByCIDR() so that NewDetectLocalByCIDR() could verify that the passed-in CIDR was of the same family as the iptables interface. It would make more sense for getLocalDetector() to verify this itself and just *not call NewDetectLocalByCIDR* if the families don't match, and that's what the code does now. So there's no longer any need to pass the utiliptables.Interface to the local detector.
145 lines
4.1 KiB
Go
145 lines
4.1 KiB
Go
/*
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Copyright 2017 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 iptables
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import (
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"fmt"
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netutils "k8s.io/utils/net"
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)
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// LocalTrafficDetector in a interface to take action (jump) based on whether traffic originated locally
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// at the node or not
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type LocalTrafficDetector interface {
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// IsImplemented returns true if the implementation does something, false otherwise
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IsImplemented() bool
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// IfLocal returns iptables arguments that will match traffic from a pod
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IfLocal() []string
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// IfNotLocal returns iptables arguments that will match traffic that is not from a pod
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IfNotLocal() []string
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}
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type noOpLocalDetector struct{}
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// NewNoOpLocalDetector is a no-op implementation of LocalTrafficDetector
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func NewNoOpLocalDetector() LocalTrafficDetector {
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return &noOpLocalDetector{}
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}
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func (n *noOpLocalDetector) IsImplemented() bool {
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return false
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}
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func (n *noOpLocalDetector) IfLocal() []string {
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return nil // no-op; matches all traffic
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}
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func (n *noOpLocalDetector) IfNotLocal() []string {
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return nil // no-op; matches all traffic
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}
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type detectLocalByCIDR struct {
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ifLocal []string
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ifNotLocal []string
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}
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// NewDetectLocalByCIDR implements the LocalTrafficDetector interface using a CIDR. This can be used when a single CIDR
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// range can be used to capture the notion of local traffic.
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func NewDetectLocalByCIDR(cidr string) (LocalTrafficDetector, error) {
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_, _, err := netutils.ParseCIDRSloppy(cidr)
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if err != nil {
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return nil, err
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}
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return &detectLocalByCIDR{
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ifLocal: []string{"-s", cidr},
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ifNotLocal: []string{"!", "-s", cidr},
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}, nil
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}
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func (d *detectLocalByCIDR) IsImplemented() bool {
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return true
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}
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func (d *detectLocalByCIDR) IfLocal() []string {
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return d.ifLocal
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}
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func (d *detectLocalByCIDR) IfNotLocal() []string {
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return d.ifNotLocal
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}
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type detectLocalByBridgeInterface struct {
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ifLocal []string
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ifNotLocal []string
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}
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// NewDetectLocalByBridgeInterface implements the LocalTrafficDetector interface using a bridge interface name.
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// This can be used when a bridge can be used to capture the notion of local traffic from pods.
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func NewDetectLocalByBridgeInterface(interfaceName string) (LocalTrafficDetector, error) {
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if len(interfaceName) == 0 {
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return nil, fmt.Errorf("no bridge interface name set")
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}
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return &detectLocalByBridgeInterface{
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ifLocal: []string{"-i", interfaceName},
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ifNotLocal: []string{"!", "-i", interfaceName},
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}, nil
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}
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func (d *detectLocalByBridgeInterface) IsImplemented() bool {
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return true
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}
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func (d *detectLocalByBridgeInterface) IfLocal() []string {
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return d.ifLocal
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}
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func (d *detectLocalByBridgeInterface) IfNotLocal() []string {
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return d.ifNotLocal
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}
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type detectLocalByInterfaceNamePrefix struct {
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ifLocal []string
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ifNotLocal []string
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}
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// NewDetectLocalByInterfaceNamePrefix implements the LocalTrafficDetector interface using an interface name prefix.
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// This can be used when a pod interface name prefix can be used to capture the notion of local traffic. Note
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// that this will match on all interfaces that start with the given prefix.
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func NewDetectLocalByInterfaceNamePrefix(interfacePrefix string) (LocalTrafficDetector, error) {
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if len(interfacePrefix) == 0 {
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return nil, fmt.Errorf("no interface prefix set")
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}
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return &detectLocalByInterfaceNamePrefix{
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ifLocal: []string{"-i", interfacePrefix + "+"},
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ifNotLocal: []string{"!", "-i", interfacePrefix + "+"},
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}, nil
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}
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func (d *detectLocalByInterfaceNamePrefix) IsImplemented() bool {
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return true
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}
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func (d *detectLocalByInterfaceNamePrefix) IfLocal() []string {
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return d.ifLocal
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}
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func (d *detectLocalByInterfaceNamePrefix) IfNotLocal() []string {
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return d.ifNotLocal
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}
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