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// Copyright 2019 The gVisor 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 header provides the implementation of the encoding and decoding of
// network protocol headers.
package header_test
import (
"fmt"
"math/rand"
"testing"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/header"
)
func TestChecksumVVWithOffset(t *testing.T) {
testCases := []struct {
name string
vv buffer.VectorisedView
off, size int
initial uint16
want uint16
}{
{
name: "empty",
vv: buffer.NewVectorisedView(0, []buffer.View{
buffer.NewViewFromBytes([]byte{1, 9, 0, 5, 4}),
}),
off: 0,
size: 0,
want: 0,
},
{
name: "OneView",
vv: buffer.NewVectorisedView(0, []buffer.View{
buffer.NewViewFromBytes([]byte{1, 9, 0, 5, 4}),
}),
off: 0,
size: 5,
want: 1294,
},
{
name: "TwoViews",
vv: buffer.NewVectorisedView(0, []buffer.View{
buffer.NewViewFromBytes([]byte{1, 9, 0, 5, 4}),
buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123}),
}),
off: 0,
size: 11,
want: 33819,
},
{
name: "TwoViewsWithOffset",
vv: buffer.NewVectorisedView(0, []buffer.View{
buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123}),
}),
off: 1,
size: 11,
want: 33819,
},
{
name: "ThreeViewsWithOffset",
vv: buffer.NewVectorisedView(0, []buffer.View{
buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123}),
}),
off: 7,
size: 11,
want: 33819,
},
{
name: "ThreeViewsWithInitial",
vv: buffer.NewVectorisedView(0, []buffer.View{
buffer.NewViewFromBytes([]byte{77, 11, 33, 0, 55, 44}),
buffer.NewViewFromBytes([]byte{98, 1, 9, 0, 5, 4}),
buffer.NewViewFromBytes([]byte{4, 3, 7, 1, 2, 123, 99}),
}),
initial: 77,
off: 7,
size: 11,
want: 33896,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
if got, want := header.ChecksumVVWithOffset(tc.vv, tc.initial, tc.off, tc.size), tc.want; got != want {
t.Errorf("header.ChecksumVVWithOffset(%v) = %v, want: %v", tc, got, tc.want)
}
v := tc.vv.ToView()
v.TrimFront(tc.off)
v.CapLength(tc.size)
if got, want := header.Checksum(v, tc.initial), tc.want; got != want {
t.Errorf("header.Checksum(%v) = %v, want: %v", tc, got, tc.want)
}
})
}
}
func TestChecksum(t *testing.T) {
var bufSizes = []int{0, 1, 2, 3, 4, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128, 255, 256, 257, 1023, 1024}
type testCase struct {
buf []byte
initial uint16
csumOrig uint16
csumNew uint16
}
testCases := make([]testCase, 100000)
// Ensure same buffer generation for test consistency.
rnd := rand.New(rand.NewSource(42))
for i := range testCases {
testCases[i].buf = make([]byte, bufSizes[i%len(bufSizes)])
testCases[i].initial = uint16(rnd.Intn(65536))
rnd.Read(testCases[i].buf)
}
for i := range testCases {
testCases[i].csumOrig = header.Checksum(testCases[i].buf, testCases[i].initial)
testCases[i].csumNew = header.UnrolledChecksum(testCases[i].buf, testCases[i].initial)
if got, want := testCases[i].csumNew, testCases[i].csumOrig; got != want {
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)
}
}
}
func BenchmarkChecksum(b *testing.B) {
var bufSizes = []int{64, 128, 256, 512, 1024, 1500, 2048, 4096, 8192, 16384, 32767, 32768, 65535, 65536}
checkSumImpls := []struct {
fn func([]byte, uint16) uint16
name string
}{
{header.Checksum, fmt.Sprintf("checksum")},
{header.UnrolledChecksum, fmt.Sprintf("unrolled_checksum")},
}
for _, csumImpl := range checkSumImpls {
// Ensure same buffer generation for test consistency.
rnd := rand.New(rand.NewSource(42))
for _, bufSz := range bufSizes {
b.Run(fmt.Sprintf("%s_%d", csumImpl.name, bufSz), func(b *testing.B) {
tc := struct {
buf []byte
initial uint16
csum uint16
}{
buf: make([]byte, bufSz),
initial: uint16(rnd.Intn(65536)),
}
rnd.Read(tc.buf)
b.ResetTimer()
for i := 0; i < b.N; i++ {
tc.csum = csumImpl.fn(tc.buf, tc.initial)
}
})
}
}
}
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