1 files changed, 101 insertions, 0 deletions
diff --git a/pkg/tcpip/header/igmp_test.go b/pkg/tcpip/header/igmp_test.go
new file mode 100644
index 000000000..66e872880
--- /dev/null
+++ b/pkg/tcpip/header/igmp_test.go
@@ -0,0 +1,101 @@
+// 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"
+
+	"gvisor.dev/gvisor/pkg/tcpip"
+	"gvisor.dev/gvisor/pkg/tcpip/header"
+)
+
+// TestIGMPHeader tests the functions within header.igmp
+func TestIGMPHeader(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)
+
+	if got, want := igmpHeader.Type(), header.IGMPMembershipQuery; got != want {
+		t.Errorf("got igmpHeader.Type() = %x, want = %x", got, want)
+	}
+
+	if got, want := igmpHeader.MaxRespTime(), byte(0xF0); got != want {
+		t.Errorf("got igmpHeader.MaxRespTime() = %x, want = %x", 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(), tcpip.Address("\x01\x02\x03\x04"); 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 := igmpHeader.MaxRespTime(); got != respTime {
+		t.Errorf("got igmpHeader.MaxRespTime() = %x, want = %x", got, respTime)
+	}
+
+	checksum := uint16(0x0102)
+	igmpHeader.SetChecksum(checksum)
+	if got := igmpHeader.Checksum(); got != checksum {
+		t.Errorf("got igmpHeader.Checksum() = %x, want = %x", got, checksum)
+	}
+
+	groupAddress := tcpip.Address("\x04\x03\x02\x01")
+	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)
+	}
+}