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// Copyright 2020 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_test
import (
"testing"
"time"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/testutil"
)
// TestIGMPHeader tests the functions within header.igmp
func TestIGMPHeader(t *testing.T) {
const maxRespTimeTenthSec = 0xF0
b := []byte{
0x11, // IGMP Type, Membership Query
maxRespTimeTenthSec, // Maximum Response Time
0xC0, 0xC0, // Checksum
0x01, 0x02, 0x03, 0x04, // Group Address
}
igmpHeader := header.IGMP(b)
if got, want := igmpHeader.Type(), header.IGMPMembershipQuery; got != want {
t.Errorf("got igmpHeader.Type() = %x, want = %x", got, want)
}
if got, want := igmpHeader.MaxRespTime(), header.DecisecondToDuration(maxRespTimeTenthSec); got != want {
t.Errorf("got igmpHeader.MaxRespTime() = %s, want = %s", got, want)
}
if got, want := igmpHeader.Checksum(), uint16(0xC0C0); got != want {
t.Errorf("got igmpHeader.Checksum() = %x, want = %x", got, want)
}
if got, want := igmpHeader.GroupAddress(), testutil.MustParse4("1.2.3.4"); got != want {
t.Errorf("got igmpHeader.GroupAddress() = %s, want = %s", got, want)
}
igmpType := header.IGMPv2MembershipReport
igmpHeader.SetType(igmpType)
if got := igmpHeader.Type(); got != igmpType {
t.Errorf("got igmpHeader.Type() = %x, want = %x", got, igmpType)
}
if got := header.IGMPType(b[0]); got != igmpType {
t.Errorf("got IGMPtype in backing buffer = %x, want %x", got, igmpType)
}
respTime := byte(0x02)
igmpHeader.SetMaxRespTime(respTime)
if got, want := igmpHeader.MaxRespTime(), header.DecisecondToDuration(respTime); got != want {
t.Errorf("got igmpHeader.MaxRespTime() = %s, want = %s", got, want)
}
checksum := uint16(0x0102)
igmpHeader.SetChecksum(checksum)
if got := igmpHeader.Checksum(); got != checksum {
t.Errorf("got igmpHeader.Checksum() = %x, want = %x", got, checksum)
}
groupAddress := testutil.MustParse4("4.3.2.1")
igmpHeader.SetGroupAddress(groupAddress)
if got := igmpHeader.GroupAddress(); got != groupAddress {
t.Errorf("got igmpHeader.GroupAddress() = %s, want = %s", got, groupAddress)
}
}
// TestIGMPChecksum ensures that the checksum calculator produces the expected
// checksum.
func TestIGMPChecksum(t *testing.T) {
b := []byte{
0x11, // IGMP Type, Membership Query
0xF0, // Maximum Response Time
0xC0, 0xC0, // Checksum
0x01, 0x02, 0x03, 0x04, // Group Address
}
igmpHeader := header.IGMP(b)
// Calculate the initial checksum after setting the checksum temporarily to 0
// to avoid checksumming the checksum.
initialChecksum := igmpHeader.Checksum()
igmpHeader.SetChecksum(0)
checksum := ^header.Checksum(b, 0)
igmpHeader.SetChecksum(initialChecksum)
if got := header.IGMPCalculateChecksum(igmpHeader); got != checksum {
t.Errorf("got IGMPCalculateChecksum = %x, want %x", got, checksum)
}
}
func TestDecisecondToDuration(t *testing.T) {
const valueInDeciseconds = 5
if got, want := header.DecisecondToDuration(valueInDeciseconds), valueInDeciseconds*time.Second/10; got != want {
t.Fatalf("got header.DecisecondToDuration(%d) = %s, want = %s", valueInDeciseconds, got, want)
}
}
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