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-rw-r--r--pkg/tcpip/stack/forwarder_test.go635
1 files changed, 0 insertions, 635 deletions
diff --git a/pkg/tcpip/stack/forwarder_test.go b/pkg/tcpip/stack/forwarder_test.go
deleted file mode 100644
index 321b7524d..000000000
--- a/pkg/tcpip/stack/forwarder_test.go
+++ /dev/null
@@ -1,635 +0,0 @@
-// 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 stack
-
-import (
- "encoding/binary"
- "math"
- "testing"
- "time"
-
- "gvisor.dev/gvisor/pkg/tcpip"
- "gvisor.dev/gvisor/pkg/tcpip/buffer"
-)
-
-const (
- fwdTestNetNumber tcpip.NetworkProtocolNumber = math.MaxUint32
- fwdTestNetHeaderLen = 12
- fwdTestNetDefaultPrefixLen = 8
-
- // fwdTestNetDefaultMTU is the MTU, in bytes, used throughout the tests,
- // except where another value is explicitly used. It is chosen to match
- // the MTU of loopback interfaces on linux systems.
- fwdTestNetDefaultMTU = 65536
-)
-
-// fwdTestNetworkEndpoint is a network-layer protocol endpoint.
-// Headers of this protocol are fwdTestNetHeaderLen bytes, but we currently only
-// use the first three: destination address, source address, and transport
-// protocol. They're all one byte fields to simplify parsing.
-type fwdTestNetworkEndpoint struct {
- nicID tcpip.NICID
- id NetworkEndpointID
- prefixLen int
- proto *fwdTestNetworkProtocol
- dispatcher TransportDispatcher
- ep LinkEndpoint
-}
-
-func (f *fwdTestNetworkEndpoint) MTU() uint32 {
- return f.ep.MTU() - uint32(f.MaxHeaderLength())
-}
-
-func (f *fwdTestNetworkEndpoint) NICID() tcpip.NICID {
- return f.nicID
-}
-
-func (f *fwdTestNetworkEndpoint) PrefixLen() int {
- return f.prefixLen
-}
-
-func (*fwdTestNetworkEndpoint) DefaultTTL() uint8 {
- return 123
-}
-
-func (f *fwdTestNetworkEndpoint) ID() *NetworkEndpointID {
- return &f.id
-}
-
-func (f *fwdTestNetworkEndpoint) HandlePacket(r *Route, pkt tcpip.PacketBuffer) {
- // Consume the network header.
- b := pkt.Data.First()
- pkt.Data.TrimFront(fwdTestNetHeaderLen)
-
- // Dispatch the packet to the transport protocol.
- f.dispatcher.DeliverTransportPacket(r, tcpip.TransportProtocolNumber(b[2]), pkt)
-}
-
-func (f *fwdTestNetworkEndpoint) MaxHeaderLength() uint16 {
- return f.ep.MaxHeaderLength() + fwdTestNetHeaderLen
-}
-
-func (f *fwdTestNetworkEndpoint) PseudoHeaderChecksum(protocol tcpip.TransportProtocolNumber, dstAddr tcpip.Address) uint16 {
- return 0
-}
-
-func (f *fwdTestNetworkEndpoint) Capabilities() LinkEndpointCapabilities {
- return f.ep.Capabilities()
-}
-
-func (f *fwdTestNetworkEndpoint) WritePacket(r *Route, gso *GSO, params NetworkHeaderParams, pkt tcpip.PacketBuffer) *tcpip.Error {
- // Add the protocol's header to the packet and send it to the link
- // endpoint.
- b := pkt.Header.Prepend(fwdTestNetHeaderLen)
- b[0] = r.RemoteAddress[0]
- b[1] = f.id.LocalAddress[0]
- b[2] = byte(params.Protocol)
-
- return f.ep.WritePacket(r, gso, fwdTestNetNumber, pkt)
-}
-
-// WritePackets implements LinkEndpoint.WritePackets.
-func (f *fwdTestNetworkEndpoint) WritePackets(r *Route, gso *GSO, pkts []tcpip.PacketBuffer, params NetworkHeaderParams) (int, *tcpip.Error) {
- panic("not implemented")
-}
-
-func (*fwdTestNetworkEndpoint) WriteHeaderIncludedPacket(r *Route, pkt tcpip.PacketBuffer) *tcpip.Error {
- return tcpip.ErrNotSupported
-}
-
-func (*fwdTestNetworkEndpoint) Close() {}
-
-// fwdTestNetworkProtocol is a network-layer protocol that implements Address
-// resolution.
-type fwdTestNetworkProtocol struct {
- addrCache *linkAddrCache
- addrResolveDelay time.Duration
- onLinkAddressResolved func(cache *linkAddrCache, addr tcpip.Address)
- onResolveStaticAddress func(tcpip.Address) (tcpip.LinkAddress, bool)
-}
-
-func (f *fwdTestNetworkProtocol) Number() tcpip.NetworkProtocolNumber {
- return fwdTestNetNumber
-}
-
-func (f *fwdTestNetworkProtocol) MinimumPacketSize() int {
- return fwdTestNetHeaderLen
-}
-
-func (f *fwdTestNetworkProtocol) DefaultPrefixLen() int {
- return fwdTestNetDefaultPrefixLen
-}
-
-func (*fwdTestNetworkProtocol) ParseAddresses(v buffer.View) (src, dst tcpip.Address) {
- return tcpip.Address(v[1:2]), tcpip.Address(v[0:1])
-}
-
-func (f *fwdTestNetworkProtocol) NewEndpoint(nicID tcpip.NICID, addrWithPrefix tcpip.AddressWithPrefix, linkAddrCache LinkAddressCache, dispatcher TransportDispatcher, ep LinkEndpoint, _ *Stack) (NetworkEndpoint, *tcpip.Error) {
- return &fwdTestNetworkEndpoint{
- nicID: nicID,
- id: NetworkEndpointID{LocalAddress: addrWithPrefix.Address},
- prefixLen: addrWithPrefix.PrefixLen,
- proto: f,
- dispatcher: dispatcher,
- ep: ep,
- }, nil
-}
-
-func (f *fwdTestNetworkProtocol) SetOption(option interface{}) *tcpip.Error {
- return tcpip.ErrUnknownProtocolOption
-}
-
-func (f *fwdTestNetworkProtocol) Option(option interface{}) *tcpip.Error {
- return tcpip.ErrUnknownProtocolOption
-}
-
-func (f *fwdTestNetworkProtocol) Close() {}
-
-func (f *fwdTestNetworkProtocol) Wait() {}
-
-func (f *fwdTestNetworkProtocol) LinkAddressRequest(addr, localAddr tcpip.Address, linkEP LinkEndpoint) *tcpip.Error {
- if f.addrCache != nil && f.onLinkAddressResolved != nil {
- time.AfterFunc(f.addrResolveDelay, func() {
- f.onLinkAddressResolved(f.addrCache, addr)
- })
- }
- return nil
-}
-
-func (f *fwdTestNetworkProtocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bool) {
- if f.onResolveStaticAddress != nil {
- return f.onResolveStaticAddress(addr)
- }
- return "", false
-}
-
-func (f *fwdTestNetworkProtocol) LinkAddressProtocol() tcpip.NetworkProtocolNumber {
- return fwdTestNetNumber
-}
-
-// fwdTestPacketInfo holds all the information about an outbound packet.
-type fwdTestPacketInfo struct {
- RemoteLinkAddress tcpip.LinkAddress
- LocalLinkAddress tcpip.LinkAddress
- Pkt tcpip.PacketBuffer
-}
-
-type fwdTestLinkEndpoint struct {
- dispatcher NetworkDispatcher
- mtu uint32
- linkAddr tcpip.LinkAddress
-
- // C is where outbound packets are queued.
- C chan fwdTestPacketInfo
-}
-
-// InjectInbound injects an inbound packet.
-func (e *fwdTestLinkEndpoint) InjectInbound(protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) {
- e.InjectLinkAddr(protocol, "", pkt)
-}
-
-// InjectLinkAddr injects an inbound packet with a remote link address.
-func (e *fwdTestLinkEndpoint) InjectLinkAddr(protocol tcpip.NetworkProtocolNumber, remote tcpip.LinkAddress, pkt tcpip.PacketBuffer) {
- e.dispatcher.DeliverNetworkPacket(e, remote, "" /* local */, protocol, pkt)
-}
-
-// Attach saves the stack network-layer dispatcher for use later when packets
-// are injected.
-func (e *fwdTestLinkEndpoint) Attach(dispatcher NetworkDispatcher) {
- e.dispatcher = dispatcher
-}
-
-// IsAttached implements stack.LinkEndpoint.IsAttached.
-func (e *fwdTestLinkEndpoint) IsAttached() bool {
- return e.dispatcher != nil
-}
-
-// MTU implements stack.LinkEndpoint.MTU. It returns the value initialized
-// during construction.
-func (e *fwdTestLinkEndpoint) MTU() uint32 {
- return e.mtu
-}
-
-// Capabilities implements stack.LinkEndpoint.Capabilities.
-func (e fwdTestLinkEndpoint) Capabilities() LinkEndpointCapabilities {
- caps := LinkEndpointCapabilities(0)
- return caps | CapabilityResolutionRequired
-}
-
-// GSOMaxSize returns the maximum GSO packet size.
-func (*fwdTestLinkEndpoint) GSOMaxSize() uint32 {
- return 1 << 15
-}
-
-// MaxHeaderLength returns the maximum size of the link layer header. Given it
-// doesn't have a header, it just returns 0.
-func (*fwdTestLinkEndpoint) MaxHeaderLength() uint16 {
- return 0
-}
-
-// LinkAddress returns the link address of this endpoint.
-func (e *fwdTestLinkEndpoint) LinkAddress() tcpip.LinkAddress {
- return e.linkAddr
-}
-
-func (e fwdTestLinkEndpoint) WritePacket(r *Route, gso *GSO, protocol tcpip.NetworkProtocolNumber, pkt tcpip.PacketBuffer) *tcpip.Error {
- p := fwdTestPacketInfo{
- RemoteLinkAddress: r.RemoteLinkAddress,
- LocalLinkAddress: r.LocalLinkAddress,
- Pkt: pkt,
- }
-
- select {
- case e.C <- p:
- default:
- }
-
- return nil
-}
-
-// WritePackets stores outbound packets into the channel.
-func (e *fwdTestLinkEndpoint) WritePackets(r *Route, gso *GSO, pkts []tcpip.PacketBuffer, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) {
- n := 0
- for _, pkt := range pkts {
- e.WritePacket(r, gso, protocol, pkt)
- n++
- }
-
- return n, nil
-}
-
-// WriteRawPacket implements stack.LinkEndpoint.WriteRawPacket.
-func (e *fwdTestLinkEndpoint) WriteRawPacket(vv buffer.VectorisedView) *tcpip.Error {
- p := fwdTestPacketInfo{
- Pkt: tcpip.PacketBuffer{Data: vv},
- }
-
- select {
- case e.C <- p:
- default:
- }
-
- return nil
-}
-
-// Wait implements stack.LinkEndpoint.Wait.
-func (*fwdTestLinkEndpoint) Wait() {}
-
-func fwdTestNetFactory(t *testing.T, proto *fwdTestNetworkProtocol) (ep1, ep2 *fwdTestLinkEndpoint) {
- // Create a stack with the network protocol and two NICs.
- s := New(Options{
- NetworkProtocols: []NetworkProtocol{proto},
- })
-
- proto.addrCache = s.linkAddrCache
-
- // Enable forwarding.
- s.SetForwarding(true)
-
- // NIC 1 has the link address "a", and added the network address 1.
- ep1 = &fwdTestLinkEndpoint{
- C: make(chan fwdTestPacketInfo, 300),
- mtu: fwdTestNetDefaultMTU,
- linkAddr: "a",
- }
- if err := s.CreateNIC(1, ep1); err != nil {
- t.Fatal("CreateNIC #1 failed:", err)
- }
- if err := s.AddAddress(1, fwdTestNetNumber, "\x01"); err != nil {
- t.Fatal("AddAddress #1 failed:", err)
- }
-
- // NIC 2 has the link address "b", and added the network address 2.
- ep2 = &fwdTestLinkEndpoint{
- C: make(chan fwdTestPacketInfo, 300),
- mtu: fwdTestNetDefaultMTU,
- linkAddr: "b",
- }
- if err := s.CreateNIC(2, ep2); err != nil {
- t.Fatal("CreateNIC #2 failed:", err)
- }
- if err := s.AddAddress(2, fwdTestNetNumber, "\x02"); err != nil {
- t.Fatal("AddAddress #2 failed:", err)
- }
-
- // Route all packets to NIC 2.
- {
- subnet, err := tcpip.NewSubnet("\x00", "\x00")
- if err != nil {
- t.Fatal(err)
- }
- s.SetRouteTable([]tcpip.Route{{Destination: subnet, NIC: 2}})
- }
-
- return ep1, ep2
-}
-
-func TestForwardingWithStaticResolver(t *testing.T) {
- // Create a network protocol with a static resolver.
- proto := &fwdTestNetworkProtocol{
- onResolveStaticAddress:
- // The network address 3 is resolved to the link address "c".
- func(addr tcpip.Address) (tcpip.LinkAddress, bool) {
- if addr == "\x03" {
- return "c", true
- }
- return "", false
- },
- }
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- // Inject an inbound packet to address 3 on NIC 1, and see if it is
- // forwarded to NIC 2.
- buf := buffer.NewView(30)
- buf[0] = 3
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
-
- var p fwdTestPacketInfo
-
- select {
- case p = <-ep2.C:
- default:
- t.Fatal("packet not forwarded")
- }
-
- // Test that the static address resolution happened correctly.
- if p.RemoteLinkAddress != "c" {
- t.Fatalf("got p.RemoteLinkAddress = %s, want = c", p.RemoteLinkAddress)
- }
- if p.LocalLinkAddress != "b" {
- t.Fatalf("got p.LocalLinkAddress = %s, want = b", p.LocalLinkAddress)
- }
-}
-
-func TestForwardingWithFakeResolver(t *testing.T) {
- // Create a network protocol with a fake resolver.
- proto := &fwdTestNetworkProtocol{
- addrResolveDelay: 500 * time.Millisecond,
- onLinkAddressResolved: func(cache *linkAddrCache, addr tcpip.Address) {
- // Any address will be resolved to the link address "c".
- cache.add(tcpip.FullAddress{NIC: 2, Addr: addr}, "c")
- },
- }
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- // Inject an inbound packet to address 3 on NIC 1, and see if it is
- // forwarded to NIC 2.
- buf := buffer.NewView(30)
- buf[0] = 3
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
-
- var p fwdTestPacketInfo
-
- select {
- case p = <-ep2.C:
- case <-time.After(time.Second):
- t.Fatal("packet not forwarded")
- }
-
- // Test that the address resolution happened correctly.
- if p.RemoteLinkAddress != "c" {
- t.Fatalf("got p.RemoteLinkAddress = %s, want = c", p.RemoteLinkAddress)
- }
- if p.LocalLinkAddress != "b" {
- t.Fatalf("got p.LocalLinkAddress = %s, want = b", p.LocalLinkAddress)
- }
-}
-
-func TestForwardingWithNoResolver(t *testing.T) {
- // Create a network protocol without a resolver.
- proto := &fwdTestNetworkProtocol{}
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- // inject an inbound packet to address 3 on NIC 1, and see if it is
- // forwarded to NIC 2.
- buf := buffer.NewView(30)
- buf[0] = 3
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
-
- select {
- case <-ep2.C:
- t.Fatal("Packet should not be forwarded")
- case <-time.After(time.Second):
- }
-}
-
-func TestForwardingWithFakeResolverPartialTimeout(t *testing.T) {
- // Create a network protocol with a fake resolver.
- proto := &fwdTestNetworkProtocol{
- addrResolveDelay: 500 * time.Millisecond,
- onLinkAddressResolved: func(cache *linkAddrCache, addr tcpip.Address) {
- // Only packets to address 3 will be resolved to the
- // link address "c".
- if addr == "\x03" {
- cache.add(tcpip.FullAddress{NIC: 2, Addr: addr}, "c")
- }
- },
- }
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- // Inject an inbound packet to address 4 on NIC 1. This packet should
- // not be forwarded.
- buf := buffer.NewView(30)
- buf[0] = 4
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
-
- // Inject an inbound packet to address 3 on NIC 1, and see if it is
- // forwarded to NIC 2.
- buf = buffer.NewView(30)
- buf[0] = 3
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
-
- var p fwdTestPacketInfo
-
- select {
- case p = <-ep2.C:
- case <-time.After(time.Second):
- t.Fatal("packet not forwarded")
- }
-
- b := p.Pkt.Header.View()
- if b[0] != 3 {
- t.Fatalf("got b[0] = %d, want = 3", b[0])
- }
-
- // Test that the address resolution happened correctly.
- if p.RemoteLinkAddress != "c" {
- t.Fatalf("got p.RemoteLinkAddress = %s, want = c", p.RemoteLinkAddress)
- }
- if p.LocalLinkAddress != "b" {
- t.Fatalf("got p.LocalLinkAddress = %s, want = b", p.LocalLinkAddress)
- }
-}
-
-func TestForwardingWithFakeResolverTwoPackets(t *testing.T) {
- // Create a network protocol with a fake resolver.
- proto := &fwdTestNetworkProtocol{
- addrResolveDelay: 500 * time.Millisecond,
- onLinkAddressResolved: func(cache *linkAddrCache, addr tcpip.Address) {
- // Any packets will be resolved to the link address "c".
- cache.add(tcpip.FullAddress{NIC: 2, Addr: addr}, "c")
- },
- }
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- // Inject two inbound packets to address 3 on NIC 1.
- for i := 0; i < 2; i++ {
- buf := buffer.NewView(30)
- buf[0] = 3
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
- }
-
- for i := 0; i < 2; i++ {
- var p fwdTestPacketInfo
-
- select {
- case p = <-ep2.C:
- case <-time.After(time.Second):
- t.Fatal("packet not forwarded")
- }
-
- b := p.Pkt.Header.View()
- if b[0] != 3 {
- t.Fatalf("got b[0] = %d, want = 3", b[0])
- }
-
- // Test that the address resolution happened correctly.
- if p.RemoteLinkAddress != "c" {
- t.Fatalf("got p.RemoteLinkAddress = %s, want = c", p.RemoteLinkAddress)
- }
- if p.LocalLinkAddress != "b" {
- t.Fatalf("got p.LocalLinkAddress = %s, want = b", p.LocalLinkAddress)
- }
- }
-}
-
-func TestForwardingWithFakeResolverManyPackets(t *testing.T) {
- // Create a network protocol with a fake resolver.
- proto := &fwdTestNetworkProtocol{
- addrResolveDelay: 500 * time.Millisecond,
- onLinkAddressResolved: func(cache *linkAddrCache, addr tcpip.Address) {
- // Any packets will be resolved to the link address "c".
- cache.add(tcpip.FullAddress{NIC: 2, Addr: addr}, "c")
- },
- }
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- for i := 0; i < maxPendingPacketsPerResolution+5; i++ {
- // Inject inbound 'maxPendingPacketsPerResolution + 5' packets on NIC 1.
- buf := buffer.NewView(30)
- buf[0] = 3
- // Set the packet sequence number.
- binary.BigEndian.PutUint16(buf[fwdTestNetHeaderLen:], uint16(i))
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
- }
-
- for i := 0; i < maxPendingPacketsPerResolution; i++ {
- var p fwdTestPacketInfo
-
- select {
- case p = <-ep2.C:
- case <-time.After(time.Second):
- t.Fatal("packet not forwarded")
- }
-
- b := p.Pkt.Header.View()
- if b[0] != 3 {
- t.Fatalf("got b[0] = %d, want = 3", b[0])
- }
- // The first 5 packets should not be forwarded so the the
- // sequemnce number should start with 5.
- want := uint16(i + 5)
- if n := binary.BigEndian.Uint16(b[fwdTestNetHeaderLen:]); n != want {
- t.Fatalf("got the packet #%d, want = #%d", n, want)
- }
-
- // Test that the address resolution happened correctly.
- if p.RemoteLinkAddress != "c" {
- t.Fatalf("got p.RemoteLinkAddress = %s, want = c", p.RemoteLinkAddress)
- }
- if p.LocalLinkAddress != "b" {
- t.Fatalf("got p.LocalLinkAddress = %s, want = b", p.LocalLinkAddress)
- }
- }
-}
-
-func TestForwardingWithFakeResolverManyResolutions(t *testing.T) {
- // Create a network protocol with a fake resolver.
- proto := &fwdTestNetworkProtocol{
- addrResolveDelay: 500 * time.Millisecond,
- onLinkAddressResolved: func(cache *linkAddrCache, addr tcpip.Address) {
- // Any packets will be resolved to the link address "c".
- cache.add(tcpip.FullAddress{NIC: 2, Addr: addr}, "c")
- },
- }
-
- ep1, ep2 := fwdTestNetFactory(t, proto)
-
- for i := 0; i < maxPendingResolutions+5; i++ {
- // Inject inbound 'maxPendingResolutions + 5' packets on NIC 1.
- // Each packet has a different destination address (3 to
- // maxPendingResolutions + 7).
- buf := buffer.NewView(30)
- buf[0] = byte(3 + i)
- ep1.InjectInbound(fwdTestNetNumber, tcpip.PacketBuffer{
- Data: buf.ToVectorisedView(),
- })
- }
-
- for i := 0; i < maxPendingResolutions; i++ {
- var p fwdTestPacketInfo
-
- select {
- case p = <-ep2.C:
- case <-time.After(time.Second):
- t.Fatal("packet not forwarded")
- }
-
- // The first 5 packets (address 3 to 7) should not be forwarded
- // because their address resolutions are interrupted.
- b := p.Pkt.Header.View()
- if b[0] < 8 {
- t.Fatalf("got b[0] = %d, want b[0] >= 8", b[0])
- }
-
- // Test that the address resolution happened correctly.
- if p.RemoteLinkAddress != "c" {
- t.Fatalf("got p.RemoteLinkAddress = %s, want = c", p.RemoteLinkAddress)
- }
- if p.LocalLinkAddress != "b" {
- t.Fatalf("got p.LocalLinkAddress = %s, want = b", p.LocalLinkAddress)
- }
- }
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 07:21:59 +0000