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// Copyright 2018 Google LLC
//
// 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}); 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)
}
})
}
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