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// Copyright 2016 The Netstack Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package header_test
import (
"reflect"
"testing"
"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
)
func TestEncodeSACKBlocks(t *testing.T) {
testCases := []struct {
sackBlocks []header.SACKBlock
want []header.SACKBlock
bufSize int
}{
{
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}, {52, 60}, {62, 70}},
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}},
40,
},
{
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}, {52, 60}, {62, 70}},
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}},
30,
},
{
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}, {52, 60}, {62, 70}},
[]header.SACKBlock{{10, 20}, {22, 30}},
20,
},
{
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}, {52, 60}, {62, 70}},
[]header.SACKBlock{{10, 20}},
10,
},
{
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}, {52, 60}, {62, 70}},
nil,
8,
},
{
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}, {52, 60}, {62, 70}},
[]header.SACKBlock{{10, 20}, {22, 30}, {32, 40}, {42, 50}},
60,
},
}
for _, tc := range testCases {
b := make([]byte, tc.bufSize)
t.Logf("testing: %v", tc)
header.EncodeSACKBlocks(tc.sackBlocks, b)
opts := header.ParseTCPOptions(b)
if got, want := opts.SACKBlocks, tc.want; !reflect.DeepEqual(got, want) {
t.Errorf("header.EncodeSACKBlocks(%v, %v), encoded blocks got: %v, want: %v", tc.sackBlocks, b, got, want)
}
}
}
func TestTCPParseOptions(t *testing.T) {
type tsOption struct {
tsVal uint32
tsEcr uint32
}
generateOptions := func(tsOpt *tsOption, sackBlocks []header.SACKBlock) []byte {
l := 0
if tsOpt != nil {
l += 10
}
if len(sackBlocks) != 0 {
l += len(sackBlocks)*8 + 2
}
b := make([]byte, l)
offset := 0
if tsOpt != nil {
offset = header.EncodeTSOption(tsOpt.tsVal, tsOpt.tsEcr, b)
}
header.EncodeSACKBlocks(sackBlocks, b[offset:])
return b
}
testCases := []struct {
b []byte
want header.TCPOptions
}{
// Trivial cases.
{nil, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionNOP}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionNOP, header.TCPOptionNOP}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionEOL}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionNOP, header.TCPOptionEOL, header.TCPOptionTS, 10, 1, 1}, header.TCPOptions{false, 0, 0, nil}},
// Test timestamp parsing.
{[]byte{header.TCPOptionNOP, header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{true, 1, 1, nil}},
{[]byte{header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{true, 1, 1, nil}},
// Test malformed timestamp option.
{[]byte{header.TCPOptionTS, 8, 1, 1}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionNOP, header.TCPOptionTS, 8, 1, 1}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionNOP, header.TCPOptionTS, 8, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{false, 0, 0, nil}},
// Test SACKBlock parsing.
{[]byte{header.TCPOptionSACK, 10, 0, 0, 0, 1, 0, 0, 0, 10}, header.TCPOptions{false, 0, 0, []header.SACKBlock{{1, 10}}}},
{[]byte{header.TCPOptionSACK, 18, 0, 0, 0, 1, 0, 0, 0, 10, 0, 0, 0, 11, 0, 0, 0, 12}, header.TCPOptions{false, 0, 0, []header.SACKBlock{{1, 10}, {11, 12}}}},
// Test malformed SACK option.
{[]byte{header.TCPOptionSACK, 0}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK, 8, 0, 0, 0, 1, 0, 0, 0, 10}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK, 11, 0, 0, 0, 1, 0, 0, 0, 10, 0, 0, 0, 11, 0, 0, 0, 12}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK, 17, 0, 0, 0, 1, 0, 0, 0, 10, 0, 0, 0, 11, 0, 0, 0, 12}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK, 10}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK, 10, 0, 0, 0, 1, 0, 0, 0}, header.TCPOptions{false, 0, 0, nil}},
// Test Timestamp + SACK block parsing.
{generateOptions(&tsOption{1, 1}, []header.SACKBlock{{1, 10}, {11, 12}}), header.TCPOptions{true, 1, 1, []header.SACKBlock{{1, 10}, {11, 12}}}},
{generateOptions(&tsOption{1, 2}, []header.SACKBlock{{1, 10}, {11, 12}}), header.TCPOptions{true, 1, 2, []header.SACKBlock{{1, 10}, {11, 12}}}},
{generateOptions(&tsOption{1, 3}, []header.SACKBlock{{1, 10}, {11, 12}, {13, 14}, {14, 15}, {15, 16}}), header.TCPOptions{true, 1, 3, []header.SACKBlock{{1, 10}, {11, 12}, {13, 14}, {14, 15}}}},
// Test valid timestamp + malformed SACK block parsing.
{[]byte{header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1, header.TCPOptionSACK}, header.TCPOptions{true, 1, 1, nil}},
{[]byte{header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1, header.TCPOptionSACK, 10}, header.TCPOptions{true, 1, 1, nil}},
{[]byte{header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1, header.TCPOptionSACK, 10, 0, 0, 0}, header.TCPOptions{true, 1, 1, nil}},
{[]byte{header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1, header.TCPOptionSACK, 11, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{true, 1, 1, nil}},
{[]byte{header.TCPOptionSACK, header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{false, 0, 0, nil}},
{[]byte{header.TCPOptionSACK, 10, header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{false, 0, 0, []header.SACKBlock{{134873088, 65536}}}},
{[]byte{header.TCPOptionSACK, 10, 0, 0, 0, header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{false, 0, 0, []header.SACKBlock{{8, 167772160}}}},
{[]byte{header.TCPOptionSACK, 11, 0, 0, 0, 1, 0, 0, 0, 1, header.TCPOptionTS, 10, 0, 0, 0, 1, 0, 0, 0, 1}, header.TCPOptions{false, 0, 0, nil}},
}
for _, tc := range testCases {
if got, want := header.ParseTCPOptions(tc.b), tc.want; !reflect.DeepEqual(got, want) {
t.Errorf("ParseTCPOptions(%v) = %v, want: %v", tc.b, got, tc.want)
}
}
}
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