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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 integration_test
import (
"testing"
"github.com/google/go-cmp/cmp"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/loopback"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
)
// TestLoopbackAcceptAllInSubnet tests that a loopback interface considers
// itself bound to all addresses in the subnet of an assigned address.
func TestLoopbackAcceptAllInSubnet(t *testing.T) {
const (
nicID = 1
localPort = 80
)
data := []byte{1, 2, 3, 4}
ipv4ProtocolAddress := tcpip.ProtocolAddress{
Protocol: header.IPv4ProtocolNumber,
AddressWithPrefix: ipv4Addr,
}
ipv4Bytes := []byte(ipv4Addr.Address)
ipv4Bytes[len(ipv4Bytes)-1]++
otherIPv4Address := tcpip.Address(ipv4Bytes)
ipv6ProtocolAddress := tcpip.ProtocolAddress{
Protocol: header.IPv6ProtocolNumber,
AddressWithPrefix: ipv6Addr,
}
ipv6Bytes := []byte(ipv6Addr.Address)
ipv6Bytes[len(ipv6Bytes)-1]++
otherIPv6Address := tcpip.Address(ipv6Bytes)
tests := []struct {
name string
addAddress tcpip.ProtocolAddress
bindAddr tcpip.Address
dstAddr tcpip.Address
expectRx bool
}{
{
name: "IPv4 bind to wildcard and send to assigned address",
addAddress: ipv4ProtocolAddress,
dstAddr: ipv4Addr.Address,
expectRx: true,
},
{
name: "IPv4 bind to wildcard and send to other subnet-local address",
addAddress: ipv4ProtocolAddress,
dstAddr: otherIPv4Address,
expectRx: true,
},
{
name: "IPv4 bind to wildcard send to other address",
addAddress: ipv4ProtocolAddress,
dstAddr: remoteIPv4Addr,
expectRx: false,
},
{
name: "IPv4 bind to other subnet-local address and send to assigned address",
addAddress: ipv4ProtocolAddress,
bindAddr: otherIPv4Address,
dstAddr: ipv4Addr.Address,
expectRx: false,
},
{
name: "IPv4 bind and send to other subnet-local address",
addAddress: ipv4ProtocolAddress,
bindAddr: otherIPv4Address,
dstAddr: otherIPv4Address,
expectRx: true,
},
{
name: "IPv4 bind to assigned address and send to other subnet-local address",
addAddress: ipv4ProtocolAddress,
bindAddr: ipv4Addr.Address,
dstAddr: otherIPv4Address,
expectRx: false,
},
{
name: "IPv6 bind and send to assigned address",
addAddress: ipv6ProtocolAddress,
bindAddr: ipv6Addr.Address,
dstAddr: ipv6Addr.Address,
expectRx: true,
},
{
name: "IPv6 bind to wildcard and send to assigned address",
addAddress: ipv6ProtocolAddress,
dstAddr: ipv6Addr.Address,
expectRx: true,
},
{
name: "IPv6 bind to wildcard and send to other subnet-local address",
addAddress: ipv6ProtocolAddress,
dstAddr: otherIPv6Address,
expectRx: true,
},
{
name: "IPv6 bind to wildcard send to other address",
addAddress: ipv6ProtocolAddress,
dstAddr: remoteIPv6Addr,
expectRx: false,
},
{
name: "IPv6 bind to other subnet-local address and send to assigned address",
addAddress: ipv6ProtocolAddress,
bindAddr: otherIPv6Address,
dstAddr: ipv6Addr.Address,
expectRx: false,
},
{
name: "IPv6 bind and send to other subnet-local address",
addAddress: ipv6ProtocolAddress,
bindAddr: otherIPv6Address,
dstAddr: otherIPv6Address,
expectRx: true,
},
{
name: "IPv6 bind to assigned address and send to other subnet-local address",
addAddress: ipv6ProtocolAddress,
bindAddr: ipv6Addr.Address,
dstAddr: otherIPv6Address,
expectRx: false,
},
{
name: "IPv6 bind and send to assigned address",
addAddress: ipv6ProtocolAddress,
bindAddr: ipv6Addr.Address,
dstAddr: ipv6Addr.Address,
expectRx: true,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New(stack.Options{
NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol(), ipv6.NewProtocol()},
TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()},
})
if err := s.CreateNIC(nicID, loopback.New()); err != nil {
t.Fatalf("CreateNIC(%d, _): %s", nicID, err)
}
if err := s.AddProtocolAddress(nicID, test.addAddress); err != nil {
t.Fatalf("AddProtocolAddress(%d, %+v): %s", nicID, test.addAddress, err)
}
s.SetRouteTable([]tcpip.Route{
tcpip.Route{
Destination: header.IPv4EmptySubnet,
NIC: nicID,
},
tcpip.Route{
Destination: header.IPv6EmptySubnet,
NIC: nicID,
},
})
wq := waiter.Queue{}
rep, err := s.NewEndpoint(udp.ProtocolNumber, test.addAddress.Protocol, &wq)
if err != nil {
t.Fatalf("NewEndpoint(%d, %d, _): %s", udp.ProtocolNumber, test.addAddress.Protocol, err)
}
defer rep.Close()
bindAddr := tcpip.FullAddress{Addr: test.bindAddr, Port: localPort}
if err := rep.Bind(bindAddr); err != nil {
t.Fatalf("rep.Bind(%+v): %s", bindAddr, err)
}
sep, err := s.NewEndpoint(udp.ProtocolNumber, test.addAddress.Protocol, &wq)
if err != nil {
t.Fatalf("NewEndpoint(%d, %d, _): %s", udp.ProtocolNumber, test.addAddress.Protocol, err)
}
defer sep.Close()
wopts := tcpip.WriteOptions{
To: &tcpip.FullAddress{
Addr: test.dstAddr,
Port: localPort,
},
}
n, _, err := sep.Write(tcpip.SlicePayload(data), wopts)
if err != nil {
t.Fatalf("sep.Write(_, _): %s", err)
}
if want := int64(len(data)); n != want {
t.Fatalf("got sep.Write(_, _) = (%d, _, nil), want = (%d, _, nil)", n, want)
}
if gotPayload, _, err := rep.Read(nil); test.expectRx {
if err != nil {
t.Fatalf("reep.Read(nil): %s", err)
}
if diff := cmp.Diff(buffer.View(data), gotPayload); diff != "" {
t.Errorf("got UDP payload mismatch (-want +got):\n%s", diff)
}
} else {
if err != tcpip.ErrWouldBlock {
t.Fatalf("got rep.Read(nil) = (%x, _, %s), want = (_, _, %s)", gotPayload, err, tcpip.ErrWouldBlock)
}
}
})
}
}
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