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// Copyright 2018 Google Inc.
//
// 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 fragmentation
import (
"reflect"
"testing"
"time"
"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
)
// vv is a helper to build VectorisedView from different strings.
func vv(size int, pieces ...string) *buffer.VectorisedView {
views := make([]buffer.View, len(pieces))
for i, p := range pieces {
views[i] = []byte(p)
}
vv := buffer.NewVectorisedView(size, views)
return &vv
}
func emptyVv() *buffer.VectorisedView {
vv := buffer.NewVectorisedView(0, nil)
return &vv
}
type processInput struct {
id uint32
first uint16
last uint16
more bool
vv *buffer.VectorisedView
}
type processOutput struct {
vv *buffer.VectorisedView
done bool
}
var processTestCases = []struct {
comment string
in []processInput
out []processOutput
}{
{
comment: "One ID",
in: []processInput{
{id: 0, first: 0, last: 1, more: true, vv: vv(2, "01")},
{id: 0, first: 2, last: 3, more: false, vv: vv(2, "23")},
},
out: []processOutput{
{vv: emptyVv(), done: false},
{vv: vv(4, "01", "23"), done: true},
},
},
{
comment: "Two IDs",
in: []processInput{
{id: 0, first: 0, last: 1, more: true, vv: vv(2, "01")},
{id: 1, first: 0, last: 1, more: true, vv: vv(2, "ab")},
{id: 1, first: 2, last: 3, more: false, vv: vv(2, "cd")},
{id: 0, first: 2, last: 3, more: false, vv: vv(2, "23")},
},
out: []processOutput{
{vv: emptyVv(), done: false},
{vv: emptyVv(), done: false},
{vv: vv(4, "ab", "cd"), done: true},
{vv: vv(4, "01", "23"), done: true},
},
},
}
func TestFragmentationProcess(t *testing.T) {
for _, c := range processTestCases {
f := NewFragmentation(1024, 512, DefaultReassembleTimeout)
for i, in := range c.in {
vv, done := f.Process(in.id, in.first, in.last, in.more, in.vv)
if !reflect.DeepEqual(vv, *(c.out[i].vv)) {
t.Errorf("Test \"%s\" Process() returned a wrong vv. Got %v. Want %v", c.comment, vv, *(c.out[i].vv))
}
if done != c.out[i].done {
t.Errorf("Test \"%s\" Process() returned a wrong done. Got %t. Want %t", c.comment, done, c.out[i].done)
}
if c.out[i].done {
if _, ok := f.reassemblers[in.id]; ok {
t.Errorf("Test \"%s\" Process() didn't remove buffer from reassemblers.", c.comment)
}
for n := f.rList.Front(); n != nil; n = n.Next() {
if n.id == in.id {
t.Errorf("Test \"%s\" Process() didn't remove buffer from rList.", c.comment)
}
}
}
}
}
}
func TestReassemblingTimeout(t *testing.T) {
timeout := time.Millisecond
f := NewFragmentation(1024, 512, timeout)
// Send first fragment with id = 0, first = 0, last = 0, and more = true.
f.Process(0, 0, 0, true, vv(1, "0"))
// Sleep more than the timeout.
time.Sleep(2 * timeout)
// Send another fragment that completes a packet.
// However, no packet should be reassembled because the fragment arrived after the timeout.
_, done := f.Process(0, 1, 1, false, vv(1, "1"))
if done {
t.Errorf("Fragmentation does not respect the reassembling timeout.")
}
}
func TestMemoryLimits(t *testing.T) {
f := NewFragmentation(3, 1, DefaultReassembleTimeout)
// Send first fragment with id = 0.
f.Process(0, 0, 0, true, vv(1, "0"))
// Send first fragment with id = 1.
f.Process(1, 0, 0, true, vv(1, "1"))
// Send first fragment with id = 2.
f.Process(2, 0, 0, true, vv(1, "2"))
// Send first fragment with id = 3. This should caused id = 0 and id = 1 to be
// evicted.
f.Process(3, 0, 0, true, vv(1, "3"))
if _, ok := f.reassemblers[0]; ok {
t.Errorf("Memory limits are not respected: id=0 has not been evicted.")
}
if _, ok := f.reassemblers[1]; ok {
t.Errorf("Memory limits are not respected: id=1 has not been evicted.")
}
if _, ok := f.reassemblers[3]; !ok {
t.Errorf("Implementation of memory limits is wrong: id=3 is not present.")
}
}
func TestMemoryLimitsIgnoresDuplicates(t *testing.T) {
f := NewFragmentation(1, 0, DefaultReassembleTimeout)
// Send first fragment with id = 0.
f.Process(0, 0, 0, true, vv(1, "0"))
// Send the same packet again.
f.Process(0, 0, 0, true, vv(1, "0"))
got := f.size
want := 1
if got != want {
t.Errorf("Wrong size, duplicates are not handled correctly: got=%d, want=%d.", got, want)
}
}
func TestFragmentationViewsDoNotEscape(t *testing.T) {
f := NewFragmentation(1024, 512, DefaultReassembleTimeout)
in := vv(2, "0", "1")
f.Process(0, 0, 1, true, in)
// Modify input view.
in.RemoveFirst()
got, _ := f.Process(0, 2, 2, false, vv(1, "2"))
want := vv(3, "0", "1", "2")
if !reflect.DeepEqual(got, *want) {
t.Errorf("Process() returned a wrong vv. Got %v. Want %v", got, *want)
}
}
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