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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 nested_test
import (
"testing"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/nested"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
type parentEndpoint struct {
nested.Endpoint
}
var _ stack.LinkEndpoint = (*parentEndpoint)(nil)
var _ stack.NetworkDispatcher = (*parentEndpoint)(nil)
type childEndpoint struct {
stack.LinkEndpoint
dispatcher stack.NetworkDispatcher
}
var _ stack.LinkEndpoint = (*childEndpoint)(nil)
func (c *childEndpoint) Attach(dispatcher stack.NetworkDispatcher) {
c.dispatcher = dispatcher
}
func (c *childEndpoint) IsAttached() bool {
return c.dispatcher != nil
}
type counterDispatcher struct {
count int
}
var _ stack.NetworkDispatcher = (*counterDispatcher)(nil)
func (d *counterDispatcher) DeliverNetworkPacket(tcpip.LinkAddress, tcpip.LinkAddress, tcpip.NetworkProtocolNumber, *stack.PacketBuffer) {
d.count++
}
func TestNestedLinkEndpoint(t *testing.T) {
const emptyAddress = tcpip.LinkAddress("")
var (
childEP childEndpoint
nestedEP parentEndpoint
disp counterDispatcher
)
nestedEP.Endpoint.Init(&childEP, &nestedEP)
if childEP.IsAttached() {
t.Error("On init, childEP.IsAttached() = true, want = false")
}
if nestedEP.IsAttached() {
t.Error("On init, nestedEP.IsAttached() = true, want = false")
}
nestedEP.Attach(&disp)
if disp.count != 0 {
t.Fatalf("After attach, got disp.count = %d, want = 0", disp.count)
}
if !childEP.IsAttached() {
t.Error("After attach, childEP.IsAttached() = false, want = true")
}
if !nestedEP.IsAttached() {
t.Error("After attach, nestedEP.IsAttached() = false, want = true")
}
nestedEP.DeliverNetworkPacket(emptyAddress, emptyAddress, header.IPv4ProtocolNumber, &stack.PacketBuffer{})
if disp.count != 1 {
t.Errorf("After first packet with dispatcher attached, got disp.count = %d, want = 1", disp.count)
}
nestedEP.Attach(nil)
if childEP.IsAttached() {
t.Error("After detach, childEP.IsAttached() = true, want = false")
}
if nestedEP.IsAttached() {
t.Error("After detach, nestedEP.IsAttached() = true, want = false")
}
disp.count = 0
nestedEP.DeliverNetworkPacket(emptyAddress, emptyAddress, header.IPv4ProtocolNumber, &stack.PacketBuffer{})
if disp.count != 0 {
t.Errorf("After second packet with dispatcher detached, got disp.count = %d, want = 0", disp.count)
}
}
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