e3549646ec
Now that we don't have to always append all of the iptables args into a single array, there's no reason to have LocalTrafficDetector take in a set of args to prepend to its own output, and also not much point in having it write out the "-j CHAIN" by itself either.
90 lines
2.5 KiB
Go
90 lines
2.5 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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utiliptables "k8s.io/kubernetes/pkg/util/iptables"
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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, ipt utiliptables.Interface) (LocalTrafficDetector, error) {
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if netutils.IsIPv6CIDRString(cidr) != ipt.IsIPv6() {
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return nil, fmt.Errorf("CIDR %s has incorrect IP version: expect isIPv6=%t", cidr, ipt.IsIPv6())
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}
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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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