Add types to parse MLD messages

Preparing for upcoming CLs that add MLD functionality.

Bug #4861

Test: header.TestMLD
PiperOrigin-RevId: 343391556

1 files changed, 61 insertions, 0 deletions

diff --git a/pkg/tcpip/header/mld_test.go b/pkg/tcpip/header/mld_test.go
new file mode 100644
index 000000000..0cecf10d4
--- /dev/null
+++ b/pkg/tcpip/header/mld_test.go
@@ -0,0 +1,61 @@
+// 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
+
+import (
+	"encoding/binary"
+	"testing"
+	"time"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+)
+
+func TestMLD(t *testing.T) {
+	b := []byte{
+		// Maximum Response Delay
+		0, 0,
+
+		// Reserved
+		0, 0,
+
+		// MulticastAddress
+		1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6,
+	}
+
+	const maxRespDelay = 513
+	binary.BigEndian.PutUint16(b, maxRespDelay)
+
+	mld := MLD(b)
+
+	if got, want := mld.MaximumResponseDelay(), maxRespDelay*time.Millisecond; got != want {
+		t.Errorf("got mld.MaximumResponseDelay() = %s, want = %s", got, want)
+	}
+
+	const newMaxRespDelay = 1234
+	mld.SetMaximumResponseDelay(newMaxRespDelay)
+	if got, want := mld.MaximumResponseDelay(), newMaxRespDelay*time.Millisecond; got != want {
+		t.Errorf("got mld.MaximumResponseDelay() = %s, want = %s", got, want)
+	}
+
+	if got, want := mld.MulticastAddress(), tcpip.Address([]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6}); got != want {
+		t.Errorf("got mld.MulticastAddress() = %s, want = %s", got, want)
+	}
+
+	multicastAddress := tcpip.Address([]byte{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0})
+	mld.SetMulticastAddress(multicastAddress)
+	if got := mld.MulticastAddress(); got != multicastAddress {
+		t.Errorf("got mld.MulticastAddress() = %s, want = %s", got, multicastAddress)
+	}
+}