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// Copyright 2018 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 waitable
import (
"testing"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/stack"
)
type countedEndpoint struct {
dispatchCount int
writeCount int
attachCount int
mtu uint32
capabilities stack.LinkEndpointCapabilities
hdrLen uint16
linkAddr tcpip.LinkAddress
dispatcher stack.NetworkDispatcher
}
func (e *countedEndpoint) DeliverNetworkPacket(linkEP stack.LinkEndpoint, remote, local tcpip.LinkAddress, protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) {
e.dispatchCount++
}
func (e *countedEndpoint) Attach(dispatcher stack.NetworkDispatcher) {
e.attachCount++
e.dispatcher = dispatcher
}
// IsAttached implements stack.LinkEndpoint.IsAttached.
func (e *countedEndpoint) IsAttached() bool {
return e.dispatcher != nil
}
func (e *countedEndpoint) MTU() uint32 {
return e.mtu
}
func (e *countedEndpoint) Capabilities() stack.LinkEndpointCapabilities {
return e.capabilities
}
func (e *countedEndpoint) MaxHeaderLength() uint16 {
return e.hdrLen
}
func (e *countedEndpoint) LinkAddress() tcpip.LinkAddress {
return e.linkAddr
}
func (e *countedEndpoint) WritePacket(r *stack.Route, _ *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) *tcpip.Error {
e.writeCount++
return nil
}
// WritePackets implements stack.LinkEndpoint.WritePackets.
func (e *countedEndpoint) WritePackets(r *stack.Route, _ *stack.GSO, hdrs []stack.PacketDescriptor, payload buffer.VectorisedView, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
e.writeCount += len(hdrs)
return len(hdrs), nil
}
func (e *countedEndpoint) WriteRawPacket(packet buffer.VectorisedView) *tcpip.Error {
e.writeCount++
return nil
}
// Wait implements stack.LinkEndpoint.Wait.
func (*countedEndpoint) Wait() {}
func TestWaitWrite(t *testing.T) {
ep := &countedEndpoint{}
wep := New(ep)
// Write and check that it goes through.
wep.WritePacket(nil, nil /* gso */, buffer.Prependable{}, buffer.VectorisedView{}, 0)
if want := 1; ep.writeCount != want {
t.Fatalf("Unexpected writeCount: got=%v, want=%v", ep.writeCount, want)
}
// Wait on dispatches, then try to write. It must go through.
wep.WaitDispatch()
wep.WritePacket(nil, nil /* gso */, buffer.Prependable{}, buffer.VectorisedView{}, 0)
if want := 2; ep.writeCount != want {
t.Fatalf("Unexpected writeCount: got=%v, want=%v", ep.writeCount, want)
}
// Wait on writes, then try to write. It must not go through.
wep.WaitWrite()
wep.WritePacket(nil, nil /* gso */, buffer.Prependable{}, buffer.VectorisedView{}, 0)
if want := 2; ep.writeCount != want {
t.Fatalf("Unexpected writeCount: got=%v, want=%v", ep.writeCount, want)
}
}
func TestWaitDispatch(t *testing.T) {
ep := &countedEndpoint{}
wep := New(ep)
// Check that attach happens.
wep.Attach(ep)
if want := 1; ep.attachCount != want {
t.Fatalf("Unexpected attachCount: got=%v, want=%v", ep.attachCount, want)
}
// Dispatch and check that it goes through.
ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, tcpip.PacketBuffer{})
if want := 1; ep.dispatchCount != want {
t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want)
}
// Wait on writes, then try to dispatch. It must go through.
wep.WaitWrite()
ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, tcpip.PacketBuffer{})
if want := 2; ep.dispatchCount != want {
t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want)
}
// Wait on dispatches, then try to dispatch. It must not go through.
wep.WaitDispatch()
ep.dispatcher.DeliverNetworkPacket(ep, "", "", 0, tcpip.PacketBuffer{})
if want := 2; ep.dispatchCount != want {
t.Fatalf("Unexpected dispatchCount: got=%v, want=%v", ep.dispatchCount, want)
}
}
func TestOtherMethods(t *testing.T) {
const (
mtu = 0xdead
capabilities = 0xbeef
hdrLen = 0x1234
linkAddr = "test address"
)
ep := &countedEndpoint{
mtu: mtu,
capabilities: capabilities,
hdrLen: hdrLen,
linkAddr: linkAddr,
}
wep := New(ep)
if v := wep.MTU(); v != mtu {
t.Fatalf("Unexpected mtu: got=%v, want=%v", v, mtu)
}
if v := wep.Capabilities(); v != capabilities {
t.Fatalf("Unexpected capabilities: got=%v, want=%v", v, capabilities)
}
if v := wep.MaxHeaderLength(); v != hdrLen {
t.Fatalf("Unexpected MaxHeaderLength: got=%v, want=%v", v, hdrLen)
}
if v := wep.LinkAddress(); v != linkAddr {
t.Fatalf("Unexpected LinkAddress: got=%q, want=%q", v, linkAddr)
}
}
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