172 lines
4.7 KiB
Go
172 lines
4.7 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Package header provides the implementation of the encoding and decoding of
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// network protocol headers.
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package header_test
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import (
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"fmt"
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"math/rand"
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"testing"
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"gvisor.dev/gvisor/pkg/tcpip/buffer"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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)
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func TestChecksumVVWithOffset(t *testing.T) {
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testCases := []struct {
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name string
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vv buffer.VectorisedView
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off, size int
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initial uint16
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want uint16
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}{
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{
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name: "empty",
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vv: buffer.NewVectorisedView(0, []buffer.View{
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buffer.NewViewFromBytes([]byte{1, 9, 0, 5, 4}),
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}),
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off: 0,
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size: 0,
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want: 0,
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},
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{
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name: "OneView",
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vv: buffer.NewVectorisedView(0, []buffer.View{
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buffer.NewViewFromBytes([]byte{1, 9, 0, 5, 4}),
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}),
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off: 0,
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size: 5,
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want: 1294,
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},
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{
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name: "TwoViews",
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vv: buffer.NewVectorisedView(0, []buffer.View{
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buffer.NewViewFromBytes([]byte{1, 9, 0, 5, 4}),
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buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123}),
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}),
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off: 0,
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size: 11,
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want: 33819,
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},
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{
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name: "TwoViewsWithOffset",
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vv: buffer.NewVectorisedView(0, []buffer.View{
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buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
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buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123}),
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}),
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off: 1,
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size: 11,
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want: 33819,
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},
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{
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name: "ThreeViewsWithOffset",
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vv: buffer.NewVectorisedView(0, []buffer.View{
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buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
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buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
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buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123}),
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}),
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off: 7,
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size: 11,
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want: 33819,
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},
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{
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name: "ThreeViewsWithInitial",
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vv: buffer.NewVectorisedView(0, []buffer.View{
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buffer.NewViewFromBytes([]byte{77, 11, 33, 0, 55, 44}),
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buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
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buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123, 99}),
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}),
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initial: 77,
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off: 7,
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size: 11,
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want: 33896,
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},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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if got, want := header.ChecksumVVWithOffset(tc.vv, tc.initial, tc.off, tc.size), tc.want; got != want {
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t.Errorf("header.ChecksumVVWithOffset(%v) = %v, want: %v", tc, got, tc.want)
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}
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v := tc.vv.ToView()
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v.TrimFront(tc.off)
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v.CapLength(tc.size)
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if got, want := header.Checksum(v, tc.initial), tc.want; got != want {
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t.Errorf("header.Checksum(%v) = %v, want: %v", tc, got, tc.want)
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}
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})
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}
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}
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func TestChecksum(t *testing.T) {
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var bufSizes = []int{0, 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128, 255, 256, 257, 1023, 1024}
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type testCase struct {
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buf []byte
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initial uint16
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csumOrig uint16
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csumNew uint16
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}
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testCases := make([]testCase, 100000)
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// Ensure same buffer generation for test consistency.
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rnd := rand.New(rand.NewSource(42))
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for i := range testCases {
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testCases[i].buf = make([]byte, bufSizes[i%len(bufSizes)])
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testCases[i].initial = uint16(rnd.Intn(65536))
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rnd.Read(testCases[i].buf)
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}
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for i := range testCases {
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testCases[i].csumOrig = header.ChecksumOld(testCases[i].buf, testCases[i].initial)
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testCases[i].csumNew = header.Checksum(testCases[i].buf, testCases[i].initial)
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if got, want := testCases[i].csumNew, testCases[i].csumOrig; got != want {
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t.Fatalf("new checksum for (buf = %x, initial = %d) does not match old got: %d, want: %d", testCases[i].buf, testCases[i].initial, got, want)
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}
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}
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}
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func BenchmarkChecksum(b *testing.B) {
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var bufSizes = []int{64, 128, 256, 512, 1024, 1500, 2048, 4096, 8192, 16384, 32767, 32768, 65535, 65536}
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checkSumImpls := []struct {
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fn func([]byte, uint16) uint16
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name string
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}{
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{header.ChecksumOld, fmt.Sprintf("checksum_old")},
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{header.Checksum, fmt.Sprintf("checksum")},
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}
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for _, csumImpl := range checkSumImpls {
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// Ensure same buffer generation for test consistency.
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rnd := rand.New(rand.NewSource(42))
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for _, bufSz := range bufSizes {
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b.Run(fmt.Sprintf("%s_%d", csumImpl.name, bufSz), func(b *testing.B) {
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tc := struct {
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buf []byte
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initial uint16
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csum uint16
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}{
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buf: make([]byte, bufSz),
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initial: uint16(rnd.Intn(65536)),
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}
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rnd.Read(tc.buf)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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tc.csum = csumImpl.fn(tc.buf, tc.initial)
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}
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})
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}
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}
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}
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