d86d1defa1
Work around Linux kernel bug that sometimes causes multiple flows to get mapped to the same IP:PORT and consequently some suffer packet drops. Also made the same update in kubelet. Also added cross-pointers between the two bodies of code, in comments. Some day we should eliminate the duplicate code. But today is not that day.
137 lines
3.4 KiB
Go
137 lines
3.4 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
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 testing
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"k8s.io/kubernetes/pkg/util/iptables"
|
|
)
|
|
|
|
const (
|
|
Destination = "-d "
|
|
Source = "-s "
|
|
DPort = "--dport "
|
|
Protocol = "-p "
|
|
Jump = "-j "
|
|
Reject = "REJECT"
|
|
ToDest = "--to-destination "
|
|
Recent = "recent "
|
|
MatchSet = "--match-set "
|
|
SrcType = "--src-type "
|
|
Masquerade = "MASQUERADE "
|
|
)
|
|
|
|
type Rule map[string]string
|
|
|
|
// no-op implementation of iptables Interface
|
|
type FakeIPTables struct {
|
|
hasRandomFully bool
|
|
Lines []byte
|
|
}
|
|
|
|
func NewFake() *FakeIPTables {
|
|
return &FakeIPTables{}
|
|
}
|
|
|
|
func (f *FakeIPTables) SetHasRandomFully(can bool) *FakeIPTables {
|
|
f.hasRandomFully = can
|
|
return f
|
|
}
|
|
|
|
func (*FakeIPTables) EnsureChain(table iptables.Table, chain iptables.Chain) (bool, error) {
|
|
return true, nil
|
|
}
|
|
|
|
func (*FakeIPTables) FlushChain(table iptables.Table, chain iptables.Chain) error {
|
|
return nil
|
|
}
|
|
|
|
func (*FakeIPTables) DeleteChain(table iptables.Table, chain iptables.Chain) error {
|
|
return nil
|
|
}
|
|
|
|
func (*FakeIPTables) EnsureRule(position iptables.RulePosition, table iptables.Table, chain iptables.Chain, args ...string) (bool, error) {
|
|
return true, nil
|
|
}
|
|
|
|
func (*FakeIPTables) DeleteRule(table iptables.Table, chain iptables.Chain, args ...string) error {
|
|
return nil
|
|
}
|
|
|
|
func (*FakeIPTables) IsIpv6() bool {
|
|
return false
|
|
}
|
|
|
|
func (f *FakeIPTables) Save(table iptables.Table) ([]byte, error) {
|
|
lines := make([]byte, len(f.Lines))
|
|
copy(lines, f.Lines)
|
|
return lines, nil
|
|
}
|
|
|
|
func (f *FakeIPTables) SaveInto(table iptables.Table, buffer *bytes.Buffer) error {
|
|
buffer.Write(f.Lines)
|
|
return nil
|
|
}
|
|
|
|
func (*FakeIPTables) Restore(table iptables.Table, data []byte, flush iptables.FlushFlag, counters iptables.RestoreCountersFlag) error {
|
|
return nil
|
|
}
|
|
|
|
func (f *FakeIPTables) RestoreAll(data []byte, flush iptables.FlushFlag, counters iptables.RestoreCountersFlag) error {
|
|
f.Lines = data
|
|
return nil
|
|
}
|
|
func (*FakeIPTables) AddReloadFunc(reloadFunc func()) {}
|
|
|
|
func (*FakeIPTables) Destroy() {}
|
|
|
|
func getToken(line, separator string) string {
|
|
tokens := strings.Split(line, separator)
|
|
if len(tokens) == 2 {
|
|
return strings.Split(tokens[1], " ")[0]
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// GetChain returns a list of rules for the given chain.
|
|
// The chain name must match exactly.
|
|
// The matching is pretty dumb, don't rely on it for anything but testing.
|
|
func (f *FakeIPTables) GetRules(chainName string) (rules []Rule) {
|
|
for _, l := range strings.Split(string(f.Lines), "\n") {
|
|
if strings.Contains(l, fmt.Sprintf("-A %v", chainName)) {
|
|
newRule := Rule(map[string]string{})
|
|
for _, arg := range []string{Destination, Source, DPort, Protocol, Jump, ToDest, Recent, MatchSet, SrcType, Masquerade} {
|
|
tok := getToken(l, arg)
|
|
if tok != "" {
|
|
newRule[arg] = tok
|
|
}
|
|
}
|
|
rules = append(rules, newRule)
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (f *FakeIPTables) HasRandomFully() bool {
|
|
return f.hasRandomFully
|
|
}
|
|
|
|
var _ = iptables.Interface(&FakeIPTables{})
|