1 files changed, 92 insertions, 0 deletions
diff --git a/pkg/tcpip/network/ipv4/ipv4_test.go b/pkg/tcpip/network/ipv4/ipv4_test.go
new file mode 100644
index 000000000..2b7067a50
--- /dev/null
+++ b/pkg/tcpip/network/ipv4/ipv4_test.go
@@ -0,0 +1,92 @@
+// Copyright 2018 Google Inc.
+//
+// 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 ipv4_test
+
+import (
+	"testing"
+
+	"gvisor.googlesource.com/gvisor/pkg/tcpip"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/link/channel"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/link/sniffer"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/network/ipv4"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/udp"
+	"gvisor.googlesource.com/gvisor/pkg/waiter"
+)
+
+func TestExcludeBroadcast(t *testing.T) {
+	s := stack.New([]string{ipv4.ProtocolName}, []string{udp.ProtocolName}, stack.Options{})
+
+	const defaultMTU = 65536
+	id, _ := channel.New(256, defaultMTU, "")
+	if testing.Verbose() {
+		id = sniffer.New(id)
+	}
+	if err := s.CreateNIC(1, id); err != nil {
+		t.Fatalf("CreateNIC failed: %v", err)
+	}
+
+	if err := s.AddAddress(1, ipv4.ProtocolNumber, header.IPv4Broadcast); err != nil {
+		t.Fatalf("AddAddress failed: %v", err)
+	}
+	if err := s.AddAddress(1, ipv4.ProtocolNumber, header.IPv4Any); err != nil {
+		t.Fatalf("AddAddress failed: %v", err)
+	}
+
+	s.SetRouteTable([]tcpip.Route{{
+		Destination: "\x00\x00\x00\x00",
+		Mask:        "\x00\x00\x00\x00",
+		Gateway:     "",
+		NIC:         1,
+	}})
+
+	randomAddr := tcpip.FullAddress{NIC: 1, Addr: "\x0a\x00\x00\x01", Port: 53}
+
+	var wq waiter.Queue
+	t.Run("WithoutPrimaryAddress", func(t *testing.T) {
+		ep, err := s.NewEndpoint(udp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer ep.Close()
+
+		// Cannot connect using a broadcast address as the source.
+		if err := ep.Connect(randomAddr); err != tcpip.ErrNoRoute {
+			t.Errorf("got ep.Connect(...) = %v, want = %v", err, tcpip.ErrNoRoute)
+		}
+
+		// However, we can bind to a broadcast address to listen.
+		if err := ep.Bind(tcpip.FullAddress{Addr: header.IPv4Broadcast, Port: 53, NIC: 1}, nil); err != nil {
+			t.Errorf("Bind failed: %v", err)
+		}
+	})
+
+	t.Run("WithPrimaryAddress", func(t *testing.T) {
+		ep, err := s.NewEndpoint(udp.ProtocolNumber, ipv4.ProtocolNumber, &wq)
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer ep.Close()
+
+		// Add a valid primary endpoint address, now we can connect.
+		if err := s.AddAddress(1, ipv4.ProtocolNumber, "\x0a\x00\x00\x02"); err != nil {
+			t.Fatalf("AddAddress failed: %v", err)
+		}
+		if err := ep.Connect(randomAddr); err != nil {
+			t.Errorf("Connect failed: %v", err)
+		}
+	})
+}