diff options
Diffstat (limited to 'pkg/tcpip/stack')
| -rw-r--r-- | pkg/tcpip/stack/BUILD | 116 | ||||
| -rw-r--r-- | pkg/tcpip/stack/forwarder_test.go | 650 | ||||
| -rw-r--r-- | pkg/tcpip/stack/linkaddrcache_test.go | 277 | ||||
| -rw-r--r-- | pkg/tcpip/stack/linkaddrentry_list.go | 193 | ||||
| -rw-r--r-- | pkg/tcpip/stack/ndp_test.go | 5309 | ||||
| -rw-r--r-- | pkg/tcpip/stack/nic_test.go | 318 | ||||
| -rw-r--r-- | pkg/tcpip/stack/packet_buffer_list.go | 193 | ||||
| -rw-r--r-- | pkg/tcpip/stack/stack_state_autogen.go | 157 | ||||
| -rw-r--r-- | pkg/tcpip/stack/stack_test.go | 3340 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_demuxer_test.go | 390 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_test.go | 664 |
11 files changed, 543 insertions, 11064 deletions
diff --git a/pkg/tcpip/stack/BUILD b/pkg/tcpip/stack/BUILD deleted file mode 100644 index 24f52b735..000000000 --- a/pkg/tcpip/stack/BUILD +++ /dev/null @@ -1,116 +0,0 @@ -load("//tools:defs.bzl", "go_library", "go_test") -load("//tools/go_generics:defs.bzl", "go_template_instance") - -package(licenses = ["notice"]) - -go_template_instance( - name = "linkaddrentry_list", - out = "linkaddrentry_list.go", - package = "stack", - prefix = "linkAddrEntry", - template = "//pkg/ilist:generic_list", - types = { - "Element": "*linkAddrEntry", - "Linker": "*linkAddrEntry", - }, -) - -go_template_instance( - name = "packet_buffer_list", - out = "packet_buffer_list.go", - package = "stack", - prefix = "PacketBuffer", - template = "//pkg/ilist:generic_list", - types = { - "Element": "*PacketBuffer", - "Linker": "*PacketBuffer", - }, -) - -go_library( - name = "stack", - srcs = [ - "conntrack.go", - "dhcpv6configurationfromndpra_string.go", - "forwarder.go", - "icmp_rate_limit.go", - "iptables.go", - "iptables_targets.go", - "iptables_types.go", - "linkaddrcache.go", - "linkaddrentry_list.go", - "ndp.go", - "nic.go", - "packet_buffer.go", - "packet_buffer_list.go", - "rand.go", - "registration.go", - "route.go", - "stack.go", - "stack_global_state.go", - "transport_demuxer.go", - ], - visibility = ["//visibility:public"], - deps = [ - "//pkg/ilist", - "//pkg/log", - "//pkg/rand", - "//pkg/sleep", - "//pkg/sync", - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/hash/jenkins", - "//pkg/tcpip/header", - "//pkg/tcpip/ports", - "//pkg/tcpip/seqnum", - "//pkg/tcpip/transport/tcpconntrack", - "//pkg/waiter", - "@org_golang_x_time//rate:go_default_library", - ], -) - -go_test( - name = "stack_x_test", - size = "medium", - srcs = [ - "ndp_test.go", - "stack_test.go", - "transport_demuxer_test.go", - "transport_test.go", - ], - deps = [ - ":stack", - "//pkg/rand", - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/checker", - "//pkg/tcpip/header", - "//pkg/tcpip/link/channel", - "//pkg/tcpip/link/loopback", - "//pkg/tcpip/network/ipv4", - "//pkg/tcpip/network/ipv6", - "//pkg/tcpip/ports", - "//pkg/tcpip/transport/icmp", - "//pkg/tcpip/transport/udp", - "//pkg/waiter", - "@com_github_google_go-cmp//cmp:go_default_library", - ], -) - -go_test( - name = "stack_test", - size = "small", - srcs = [ - "forwarder_test.go", - "linkaddrcache_test.go", - "nic_test.go", - ], - library = ":stack", - deps = [ - "//pkg/sleep", - "//pkg/sync", - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/header", - ], -) diff --git a/pkg/tcpip/stack/forwarder_test.go b/pkg/tcpip/stack/forwarder_test.go deleted file mode 100644 index a6546cef0..000000000 --- a/pkg/tcpip/stack/forwarder_test.go +++ /dev/null @@ -1,650 +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 - - dstAddrOffset = 0 - srcAddrOffset = 1 - protocolNumberOffset = 2 -) - -// 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 *PacketBuffer) { - // Dispatch the packet to the transport protocol. - f.dispatcher.DeliverTransportPacket(r, tcpip.TransportProtocolNumber(pkt.NetworkHeader[protocolNumberOffset]), 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) NetworkProtocolNumber() tcpip.NetworkProtocolNumber { - return f.proto.Number() -} - -func (f *fwdTestNetworkEndpoint) WritePacket(r *Route, gso *GSO, params NetworkHeaderParams, pkt *PacketBuffer) *tcpip.Error { - // Add the protocol's header to the packet and send it to the link - // endpoint. - b := pkt.Header.Prepend(fwdTestNetHeaderLen) - b[dstAddrOffset] = r.RemoteAddress[0] - b[srcAddrOffset] = f.id.LocalAddress[0] - b[protocolNumberOffset] = byte(params.Protocol) - - return f.ep.WritePacket(r, gso, fwdTestNetNumber, pkt) -} - -// WritePackets implements LinkEndpoint.WritePackets. -func (f *fwdTestNetworkEndpoint) WritePackets(r *Route, gso *GSO, pkts PacketBufferList, params NetworkHeaderParams) (int, *tcpip.Error) { - panic("not implemented") -} - -func (*fwdTestNetworkEndpoint) WriteHeaderIncludedPacket(r *Route, pkt *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[srcAddrOffset : srcAddrOffset+1]), tcpip.Address(v[dstAddrOffset : dstAddrOffset+1]) -} - -func (*fwdTestNetworkProtocol) Parse(pkt *PacketBuffer) (tcpip.TransportProtocolNumber, bool, bool) { - netHeader, ok := pkt.Data.PullUp(fwdTestNetHeaderLen) - if !ok { - return 0, false, false - } - pkt.NetworkHeader = netHeader - pkt.Data.TrimFront(fwdTestNetHeaderLen) - return tcpip.TransportProtocolNumber(pkt.NetworkHeader[protocolNumberOffset]), true, true -} - -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 *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 *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 *PacketBuffer) { - e.dispatcher.DeliverNetworkPacket(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 *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 PacketBufferList, protocol tcpip.NetworkProtocolNumber) (int, *tcpip.Error) { - n := 0 - for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() { - 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: &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[dstAddrOffset] = 3 - ep1.InjectInbound(fwdTestNetNumber, &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[dstAddrOffset] = 3 - ep1.InjectInbound(fwdTestNetNumber, &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[dstAddrOffset] = 3 - ep1.InjectInbound(fwdTestNetNumber, &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[dstAddrOffset] = 4 - ep1.InjectInbound(fwdTestNetNumber, &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[dstAddrOffset] = 3 - ep1.InjectInbound(fwdTestNetNumber, &PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - - var p fwdTestPacketInfo - - select { - case p = <-ep2.C: - case <-time.After(time.Second): - t.Fatal("packet not forwarded") - } - - if p.Pkt.NetworkHeader[dstAddrOffset] != 3 { - t.Fatalf("got p.Pkt.NetworkHeader[dstAddrOffset] = %d, want = 3", p.Pkt.NetworkHeader[dstAddrOffset]) - } - - // 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[dstAddrOffset] = 3 - ep1.InjectInbound(fwdTestNetNumber, &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") - } - - if p.Pkt.NetworkHeader[dstAddrOffset] != 3 { - t.Fatalf("got p.Pkt.NetworkHeader[dstAddrOffset] = %d, want = 3", p.Pkt.NetworkHeader[dstAddrOffset]) - } - - // 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[dstAddrOffset] = 3 - // Set the packet sequence number. - binary.BigEndian.PutUint16(buf[fwdTestNetHeaderLen:], uint16(i)) - ep1.InjectInbound(fwdTestNetNumber, &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") - } - - if b := p.Pkt.Header.View(); b[dstAddrOffset] != 3 { - t.Fatalf("got b[dstAddrOffset] = %d, want = 3", b[dstAddrOffset]) - } - seqNumBuf, ok := p.Pkt.Data.PullUp(2) // The sequence number is a uint16 (2 bytes). - if !ok { - t.Fatalf("p.Pkt.Data is too short to hold a sequence number: %d", p.Pkt.Data.Size()) - } - - // The first 5 packets should not be forwarded so the sequence number should - // start with 5. - want := uint16(i + 5) - if n := binary.BigEndian.Uint16(seqNumBuf); 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[dstAddrOffset] = byte(3 + i) - ep1.InjectInbound(fwdTestNetNumber, &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. - if p.Pkt.NetworkHeader[dstAddrOffset] < 8 { - t.Fatalf("got p.Pkt.NetworkHeader[dstAddrOffset] = %d, want p.Pkt.NetworkHeader[dstAddrOffset] >= 8", p.Pkt.NetworkHeader[dstAddrOffset]) - } - - // 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) - } - } -} diff --git a/pkg/tcpip/stack/linkaddrcache_test.go b/pkg/tcpip/stack/linkaddrcache_test.go deleted file mode 100644 index 1baa498d0..000000000 --- a/pkg/tcpip/stack/linkaddrcache_test.go +++ /dev/null @@ -1,277 +0,0 @@ -// 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 stack - -import ( - "fmt" - "sync/atomic" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/sleep" - "gvisor.dev/gvisor/pkg/sync" - "gvisor.dev/gvisor/pkg/tcpip" -) - -type testaddr struct { - addr tcpip.FullAddress - linkAddr tcpip.LinkAddress -} - -var testAddrs = func() []testaddr { - var addrs []testaddr - for i := 0; i < 4*linkAddrCacheSize; i++ { - addr := fmt.Sprintf("Addr%06d", i) - addrs = append(addrs, testaddr{ - addr: tcpip.FullAddress{NIC: 1, Addr: tcpip.Address(addr)}, - linkAddr: tcpip.LinkAddress("Link" + addr), - }) - } - return addrs -}() - -type testLinkAddressResolver struct { - cache *linkAddrCache - delay time.Duration - onLinkAddressRequest func() -} - -func (r *testLinkAddressResolver) LinkAddressRequest(addr, _ tcpip.Address, _ LinkEndpoint) *tcpip.Error { - time.AfterFunc(r.delay, func() { r.fakeRequest(addr) }) - if f := r.onLinkAddressRequest; f != nil { - f() - } - return nil -} - -func (r *testLinkAddressResolver) fakeRequest(addr tcpip.Address) { - for _, ta := range testAddrs { - if ta.addr.Addr == addr { - r.cache.add(ta.addr, ta.linkAddr) - break - } - } -} - -func (*testLinkAddressResolver) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bool) { - if addr == "broadcast" { - return "mac_broadcast", true - } - return "", false -} - -func (*testLinkAddressResolver) LinkAddressProtocol() tcpip.NetworkProtocolNumber { - return 1 -} - -func getBlocking(c *linkAddrCache, addr tcpip.FullAddress, linkRes LinkAddressResolver) (tcpip.LinkAddress, *tcpip.Error) { - w := sleep.Waker{} - s := sleep.Sleeper{} - s.AddWaker(&w, 123) - defer s.Done() - - for { - if got, _, err := c.get(addr, linkRes, "", nil, &w); err != tcpip.ErrWouldBlock { - return got, err - } - s.Fetch(true) - } -} - -func TestCacheOverflow(t *testing.T) { - c := newLinkAddrCache(1<<63-1, 1*time.Second, 3) - for i := len(testAddrs) - 1; i >= 0; i-- { - e := testAddrs[i] - c.add(e.addr, e.linkAddr) - got, _, err := c.get(e.addr, nil, "", nil, nil) - if err != nil { - t.Errorf("insert %d, c.get(%q)=%q, got error: %v", i, string(e.addr.Addr), got, err) - } - if got != e.linkAddr { - t.Errorf("insert %d, c.get(%q)=%q, want %q", i, string(e.addr.Addr), got, e.linkAddr) - } - } - // Expect to find at least half of the most recent entries. - for i := 0; i < linkAddrCacheSize/2; i++ { - e := testAddrs[i] - got, _, err := c.get(e.addr, nil, "", nil, nil) - if err != nil { - t.Errorf("check %d, c.get(%q)=%q, got error: %v", i, string(e.addr.Addr), got, err) - } - if got != e.linkAddr { - t.Errorf("check %d, c.get(%q)=%q, want %q", i, string(e.addr.Addr), got, e.linkAddr) - } - } - // The earliest entries should no longer be in the cache. - for i := len(testAddrs) - 1; i >= len(testAddrs)-linkAddrCacheSize; i-- { - e := testAddrs[i] - if _, _, err := c.get(e.addr, nil, "", nil, nil); err != tcpip.ErrNoLinkAddress { - t.Errorf("check %d, c.get(%q), got error: %v, want: error ErrNoLinkAddress", i, string(e.addr.Addr), err) - } - } -} - -func TestCacheConcurrent(t *testing.T) { - c := newLinkAddrCache(1<<63-1, 1*time.Second, 3) - - var wg sync.WaitGroup - for r := 0; r < 16; r++ { - wg.Add(1) - go func() { - for _, e := range testAddrs { - c.add(e.addr, e.linkAddr) - c.get(e.addr, nil, "", nil, nil) // make work for gotsan - } - wg.Done() - }() - } - wg.Wait() - - // All goroutines add in the same order and add more values than - // can fit in the cache, so our eviction strategy requires that - // the last entry be present and the first be missing. - e := testAddrs[len(testAddrs)-1] - got, _, err := c.get(e.addr, nil, "", nil, nil) - if err != nil { - t.Errorf("c.get(%q)=%q, got error: %v", string(e.addr.Addr), got, err) - } - if got != e.linkAddr { - t.Errorf("c.get(%q)=%q, want %q", string(e.addr.Addr), got, e.linkAddr) - } - - e = testAddrs[0] - if _, _, err := c.get(e.addr, nil, "", nil, nil); err != tcpip.ErrNoLinkAddress { - t.Errorf("c.get(%q), got error: %v, want: error ErrNoLinkAddress", string(e.addr.Addr), err) - } -} - -func TestCacheAgeLimit(t *testing.T) { - c := newLinkAddrCache(1*time.Millisecond, 1*time.Second, 3) - e := testAddrs[0] - c.add(e.addr, e.linkAddr) - time.Sleep(50 * time.Millisecond) - if _, _, err := c.get(e.addr, nil, "", nil, nil); err != tcpip.ErrNoLinkAddress { - t.Errorf("c.get(%q), got error: %v, want: error ErrNoLinkAddress", string(e.addr.Addr), err) - } -} - -func TestCacheReplace(t *testing.T) { - c := newLinkAddrCache(1<<63-1, 1*time.Second, 3) - e := testAddrs[0] - l2 := e.linkAddr + "2" - c.add(e.addr, e.linkAddr) - got, _, err := c.get(e.addr, nil, "", nil, nil) - if err != nil { - t.Errorf("c.get(%q)=%q, got error: %v", string(e.addr.Addr), got, err) - } - if got != e.linkAddr { - t.Errorf("c.get(%q)=%q, want %q", string(e.addr.Addr), got, e.linkAddr) - } - - c.add(e.addr, l2) - got, _, err = c.get(e.addr, nil, "", nil, nil) - if err != nil { - t.Errorf("c.get(%q)=%q, got error: %v", string(e.addr.Addr), got, err) - } - if got != l2 { - t.Errorf("c.get(%q)=%q, want %q", string(e.addr.Addr), got, l2) - } -} - -func TestCacheResolution(t *testing.T) { - c := newLinkAddrCache(1<<63-1, 250*time.Millisecond, 1) - linkRes := &testLinkAddressResolver{cache: c} - for i, ta := range testAddrs { - got, err := getBlocking(c, ta.addr, linkRes) - if err != nil { - t.Errorf("check %d, c.get(%q)=%q, got error: %v", i, string(ta.addr.Addr), got, err) - } - if got != ta.linkAddr { - t.Errorf("check %d, c.get(%q)=%q, want %q", i, string(ta.addr.Addr), got, ta.linkAddr) - } - } - - // Check that after resolved, address stays in the cache and never returns WouldBlock. - for i := 0; i < 10; i++ { - e := testAddrs[len(testAddrs)-1] - got, _, err := c.get(e.addr, linkRes, "", nil, nil) - if err != nil { - t.Errorf("c.get(%q)=%q, got error: %v", string(e.addr.Addr), got, err) - } - if got != e.linkAddr { - t.Errorf("c.get(%q)=%q, want %q", string(e.addr.Addr), got, e.linkAddr) - } - } -} - -func TestCacheResolutionFailed(t *testing.T) { - c := newLinkAddrCache(1<<63-1, 10*time.Millisecond, 5) - linkRes := &testLinkAddressResolver{cache: c} - - var requestCount uint32 - linkRes.onLinkAddressRequest = func() { - atomic.AddUint32(&requestCount, 1) - } - - // First, sanity check that resolution is working... - e := testAddrs[0] - got, err := getBlocking(c, e.addr, linkRes) - if err != nil { - t.Errorf("c.get(%q)=%q, got error: %v", string(e.addr.Addr), got, err) - } - if got != e.linkAddr { - t.Errorf("c.get(%q)=%q, want %q", string(e.addr.Addr), got, e.linkAddr) - } - - before := atomic.LoadUint32(&requestCount) - - e.addr.Addr += "2" - if _, err := getBlocking(c, e.addr, linkRes); err != tcpip.ErrNoLinkAddress { - t.Errorf("c.get(%q), got error: %v, want: error ErrNoLinkAddress", string(e.addr.Addr), err) - } - - if got, want := int(atomic.LoadUint32(&requestCount)-before), c.resolutionAttempts; got != want { - t.Errorf("got link address request count = %d, want = %d", got, want) - } -} - -func TestCacheResolutionTimeout(t *testing.T) { - resolverDelay := 500 * time.Millisecond - expiration := resolverDelay / 10 - c := newLinkAddrCache(expiration, 1*time.Millisecond, 3) - linkRes := &testLinkAddressResolver{cache: c, delay: resolverDelay} - - e := testAddrs[0] - if _, err := getBlocking(c, e.addr, linkRes); err != tcpip.ErrNoLinkAddress { - t.Errorf("c.get(%q), got error: %v, want: error ErrNoLinkAddress", string(e.addr.Addr), err) - } -} - -// TestStaticResolution checks that static link addresses are resolved immediately and don't -// send resolution requests. -func TestStaticResolution(t *testing.T) { - c := newLinkAddrCache(1<<63-1, time.Millisecond, 1) - linkRes := &testLinkAddressResolver{cache: c, delay: time.Minute} - - addr := tcpip.Address("broadcast") - want := tcpip.LinkAddress("mac_broadcast") - got, _, err := c.get(tcpip.FullAddress{Addr: addr}, linkRes, "", nil, nil) - if err != nil { - t.Errorf("c.get(%q)=%q, got error: %v", string(addr), string(got), err) - } - if got != want { - t.Errorf("c.get(%q)=%q, want %q", string(addr), string(got), string(want)) - } -} diff --git a/pkg/tcpip/stack/linkaddrentry_list.go b/pkg/tcpip/stack/linkaddrentry_list.go new file mode 100644 index 000000000..43022f9b3 --- /dev/null +++ b/pkg/tcpip/stack/linkaddrentry_list.go @@ -0,0 +1,193 @@ +package stack + +// ElementMapper provides an identity mapping by default. +// +// This can be replaced to provide a struct that maps elements to linker +// objects, if they are not the same. An ElementMapper is not typically +// required if: Linker is left as is, Element is left as is, or Linker and +// Element are the same type. +type linkAddrEntryElementMapper struct{} + +// linkerFor maps an Element to a Linker. +// +// This default implementation should be inlined. +// +//go:nosplit +func (linkAddrEntryElementMapper) linkerFor(elem *linkAddrEntry) *linkAddrEntry { return elem } + +// List is an intrusive list. Entries can be added to or removed from the list +// in O(1) time and with no additional memory allocations. +// +// The zero value for List is an empty list ready to use. +// +// To iterate over a list (where l is a List): +// for e := l.Front(); e != nil; e = e.Next() { +// // do something with e. +// } +// +// +stateify savable +type linkAddrEntryList struct { + head *linkAddrEntry + tail *linkAddrEntry +} + +// Reset resets list l to the empty state. +func (l *linkAddrEntryList) Reset() { + l.head = nil + l.tail = nil +} + +// Empty returns true iff the list is empty. +func (l *linkAddrEntryList) Empty() bool { + return l.head == nil +} + +// Front returns the first element of list l or nil. +func (l *linkAddrEntryList) Front() *linkAddrEntry { + return l.head +} + +// Back returns the last element of list l or nil. +func (l *linkAddrEntryList) Back() *linkAddrEntry { + return l.tail +} + +// Len returns the number of elements in the list. +// +// NOTE: This is an O(n) operation. +func (l *linkAddrEntryList) Len() (count int) { + for e := l.Front(); e != nil; e = e.Next() { + count++ + } + return count +} + +// PushFront inserts the element e at the front of list l. +func (l *linkAddrEntryList) PushFront(e *linkAddrEntry) { + linker := linkAddrEntryElementMapper{}.linkerFor(e) + linker.SetNext(l.head) + linker.SetPrev(nil) + if l.head != nil { + linkAddrEntryElementMapper{}.linkerFor(l.head).SetPrev(e) + } else { + l.tail = e + } + + l.head = e +} + +// PushBack inserts the element e at the back of list l. +func (l *linkAddrEntryList) PushBack(e *linkAddrEntry) { + linker := linkAddrEntryElementMapper{}.linkerFor(e) + linker.SetNext(nil) + linker.SetPrev(l.tail) + if l.tail != nil { + linkAddrEntryElementMapper{}.linkerFor(l.tail).SetNext(e) + } else { + l.head = e + } + + l.tail = e +} + +// PushBackList inserts list m at the end of list l, emptying m. +func (l *linkAddrEntryList) PushBackList(m *linkAddrEntryList) { + if l.head == nil { + l.head = m.head + l.tail = m.tail + } else if m.head != nil { + linkAddrEntryElementMapper{}.linkerFor(l.tail).SetNext(m.head) + linkAddrEntryElementMapper{}.linkerFor(m.head).SetPrev(l.tail) + + l.tail = m.tail + } + m.head = nil + m.tail = nil +} + +// InsertAfter inserts e after b. +func (l *linkAddrEntryList) InsertAfter(b, e *linkAddrEntry) { + bLinker := linkAddrEntryElementMapper{}.linkerFor(b) + eLinker := linkAddrEntryElementMapper{}.linkerFor(e) + + a := bLinker.Next() + + eLinker.SetNext(a) + eLinker.SetPrev(b) + bLinker.SetNext(e) + + if a != nil { + linkAddrEntryElementMapper{}.linkerFor(a).SetPrev(e) + } else { + l.tail = e + } +} + +// InsertBefore inserts e before a. +func (l *linkAddrEntryList) InsertBefore(a, e *linkAddrEntry) { + aLinker := linkAddrEntryElementMapper{}.linkerFor(a) + eLinker := linkAddrEntryElementMapper{}.linkerFor(e) + + b := aLinker.Prev() + eLinker.SetNext(a) + eLinker.SetPrev(b) + aLinker.SetPrev(e) + + if b != nil { + linkAddrEntryElementMapper{}.linkerFor(b).SetNext(e) + } else { + l.head = e + } +} + +// Remove removes e from l. +func (l *linkAddrEntryList) Remove(e *linkAddrEntry) { + linker := linkAddrEntryElementMapper{}.linkerFor(e) + prev := linker.Prev() + next := linker.Next() + + if prev != nil { + linkAddrEntryElementMapper{}.linkerFor(prev).SetNext(next) + } else { + l.head = next + } + + if next != nil { + linkAddrEntryElementMapper{}.linkerFor(next).SetPrev(prev) + } else { + l.tail = prev + } + + linker.SetNext(nil) + linker.SetPrev(nil) +} + +// Entry is a default implementation of Linker. Users can add anonymous fields +// of this type to their structs to make them automatically implement the +// methods needed by List. +// +// +stateify savable +type linkAddrEntryEntry struct { + next *linkAddrEntry + prev *linkAddrEntry +} + +// Next returns the entry that follows e in the list. +func (e *linkAddrEntryEntry) Next() *linkAddrEntry { + return e.next +} + +// Prev returns the entry that precedes e in the list. +func (e *linkAddrEntryEntry) Prev() *linkAddrEntry { + return e.prev +} + +// SetNext assigns 'entry' as the entry that follows e in the list. +func (e *linkAddrEntryEntry) SetNext(elem *linkAddrEntry) { + e.next = elem +} + +// SetPrev assigns 'entry' as the entry that precedes e in the list. +func (e *linkAddrEntryEntry) SetPrev(elem *linkAddrEntry) { + e.prev = elem +} diff --git a/pkg/tcpip/stack/ndp_test.go b/pkg/tcpip/stack/ndp_test.go deleted file mode 100644 index 58f1ebf60..000000000 --- a/pkg/tcpip/stack/ndp_test.go +++ /dev/null @@ -1,5309 +0,0 @@ -// Copyright 2019 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_test - -import ( - "context" - "encoding/binary" - "fmt" - "testing" - "time" - - "github.com/google/go-cmp/cmp" - "gvisor.dev/gvisor/pkg/rand" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/checker" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/link/channel" - "gvisor.dev/gvisor/pkg/tcpip/network/ipv6" - "gvisor.dev/gvisor/pkg/tcpip/stack" - "gvisor.dev/gvisor/pkg/tcpip/transport/icmp" - "gvisor.dev/gvisor/pkg/tcpip/transport/udp" - "gvisor.dev/gvisor/pkg/waiter" -) - -const ( - addr1 = tcpip.Address("\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01") - addr2 = tcpip.Address("\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02") - addr3 = tcpip.Address("\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03") - linkAddr1 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x06") - linkAddr2 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x07") - linkAddr3 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x08") - linkAddr4 = tcpip.LinkAddress("\x02\x02\x03\x04\x05\x09") - defaultTimeout = 100 * time.Millisecond - defaultAsyncEventTimeout = time.Second -) - -var ( - llAddr1 = header.LinkLocalAddr(linkAddr1) - llAddr2 = header.LinkLocalAddr(linkAddr2) - llAddr3 = header.LinkLocalAddr(linkAddr3) - llAddr4 = header.LinkLocalAddr(linkAddr4) - dstAddr = tcpip.FullAddress{ - Addr: "\x0a\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01", - Port: 25, - } -) - -func addrForSubnet(subnet tcpip.Subnet, linkAddr tcpip.LinkAddress) tcpip.AddressWithPrefix { - if !header.IsValidUnicastEthernetAddress(linkAddr) { - return tcpip.AddressWithPrefix{} - } - - addrBytes := []byte(subnet.ID()) - header.EthernetAdddressToModifiedEUI64IntoBuf(linkAddr, addrBytes[header.IIDOffsetInIPv6Address:]) - return tcpip.AddressWithPrefix{ - Address: tcpip.Address(addrBytes), - PrefixLen: 64, - } -} - -// prefixSubnetAddr returns a prefix (Address + Length), the prefix's equivalent -// tcpip.Subnet, and an address where the lower half of the address is composed -// of the EUI-64 of linkAddr if it is a valid unicast ethernet address. -func prefixSubnetAddr(offset uint8, linkAddr tcpip.LinkAddress) (tcpip.AddressWithPrefix, tcpip.Subnet, tcpip.AddressWithPrefix) { - prefixBytes := []byte{1, 2, 3, 4, 5, 6, 7, 8 + offset, 0, 0, 0, 0, 0, 0, 0, 0} - prefix := tcpip.AddressWithPrefix{ - Address: tcpip.Address(prefixBytes), - PrefixLen: 64, - } - - subnet := prefix.Subnet() - - return prefix, subnet, addrForSubnet(subnet, linkAddr) -} - -// ndpDADEvent is a set of parameters that was passed to -// ndpDispatcher.OnDuplicateAddressDetectionStatus. -type ndpDADEvent struct { - nicID tcpip.NICID - addr tcpip.Address - resolved bool - err *tcpip.Error -} - -type ndpRouterEvent struct { - nicID tcpip.NICID - addr tcpip.Address - // true if router was discovered, false if invalidated. - discovered bool -} - -type ndpPrefixEvent struct { - nicID tcpip.NICID - prefix tcpip.Subnet - // true if prefix was discovered, false if invalidated. - discovered bool -} - -type ndpAutoGenAddrEventType int - -const ( - newAddr ndpAutoGenAddrEventType = iota - deprecatedAddr - invalidatedAddr -) - -type ndpAutoGenAddrEvent struct { - nicID tcpip.NICID - addr tcpip.AddressWithPrefix - eventType ndpAutoGenAddrEventType -} - -type ndpRDNSS struct { - addrs []tcpip.Address - lifetime time.Duration -} - -type ndpRDNSSEvent struct { - nicID tcpip.NICID - rdnss ndpRDNSS -} - -type ndpDNSSLEvent struct { - nicID tcpip.NICID - domainNames []string - lifetime time.Duration -} - -type ndpDHCPv6Event struct { - nicID tcpip.NICID - configuration stack.DHCPv6ConfigurationFromNDPRA -} - -var _ stack.NDPDispatcher = (*ndpDispatcher)(nil) - -// ndpDispatcher implements NDPDispatcher so tests can know when various NDP -// related events happen for test purposes. -type ndpDispatcher struct { - dadC chan ndpDADEvent - routerC chan ndpRouterEvent - rememberRouter bool - prefixC chan ndpPrefixEvent - rememberPrefix bool - autoGenAddrC chan ndpAutoGenAddrEvent - rdnssC chan ndpRDNSSEvent - dnsslC chan ndpDNSSLEvent - routeTable []tcpip.Route - dhcpv6ConfigurationC chan ndpDHCPv6Event -} - -// Implements stack.NDPDispatcher.OnDuplicateAddressDetectionStatus. -func (n *ndpDispatcher) OnDuplicateAddressDetectionStatus(nicID tcpip.NICID, addr tcpip.Address, resolved bool, err *tcpip.Error) { - if n.dadC != nil { - n.dadC <- ndpDADEvent{ - nicID, - addr, - resolved, - err, - } - } -} - -// Implements stack.NDPDispatcher.OnDefaultRouterDiscovered. -func (n *ndpDispatcher) OnDefaultRouterDiscovered(nicID tcpip.NICID, addr tcpip.Address) bool { - if c := n.routerC; c != nil { - c <- ndpRouterEvent{ - nicID, - addr, - true, - } - } - - return n.rememberRouter -} - -// Implements stack.NDPDispatcher.OnDefaultRouterInvalidated. -func (n *ndpDispatcher) OnDefaultRouterInvalidated(nicID tcpip.NICID, addr tcpip.Address) { - if c := n.routerC; c != nil { - c <- ndpRouterEvent{ - nicID, - addr, - false, - } - } -} - -// Implements stack.NDPDispatcher.OnOnLinkPrefixDiscovered. -func (n *ndpDispatcher) OnOnLinkPrefixDiscovered(nicID tcpip.NICID, prefix tcpip.Subnet) bool { - if c := n.prefixC; c != nil { - c <- ndpPrefixEvent{ - nicID, - prefix, - true, - } - } - - return n.rememberPrefix -} - -// Implements stack.NDPDispatcher.OnOnLinkPrefixInvalidated. -func (n *ndpDispatcher) OnOnLinkPrefixInvalidated(nicID tcpip.NICID, prefix tcpip.Subnet) { - if c := n.prefixC; c != nil { - c <- ndpPrefixEvent{ - nicID, - prefix, - false, - } - } -} - -func (n *ndpDispatcher) OnAutoGenAddress(nicID tcpip.NICID, addr tcpip.AddressWithPrefix) bool { - if c := n.autoGenAddrC; c != nil { - c <- ndpAutoGenAddrEvent{ - nicID, - addr, - newAddr, - } - } - return true -} - -func (n *ndpDispatcher) OnAutoGenAddressDeprecated(nicID tcpip.NICID, addr tcpip.AddressWithPrefix) { - if c := n.autoGenAddrC; c != nil { - c <- ndpAutoGenAddrEvent{ - nicID, - addr, - deprecatedAddr, - } - } -} - -func (n *ndpDispatcher) OnAutoGenAddressInvalidated(nicID tcpip.NICID, addr tcpip.AddressWithPrefix) { - if c := n.autoGenAddrC; c != nil { - c <- ndpAutoGenAddrEvent{ - nicID, - addr, - invalidatedAddr, - } - } -} - -// Implements stack.NDPDispatcher.OnRecursiveDNSServerOption. -func (n *ndpDispatcher) OnRecursiveDNSServerOption(nicID tcpip.NICID, addrs []tcpip.Address, lifetime time.Duration) { - if c := n.rdnssC; c != nil { - c <- ndpRDNSSEvent{ - nicID, - ndpRDNSS{ - addrs, - lifetime, - }, - } - } -} - -// Implements stack.NDPDispatcher.OnDNSSearchListOption. -func (n *ndpDispatcher) OnDNSSearchListOption(nicID tcpip.NICID, domainNames []string, lifetime time.Duration) { - if n.dnsslC != nil { - n.dnsslC <- ndpDNSSLEvent{ - nicID, - domainNames, - lifetime, - } - } -} - -// Implements stack.NDPDispatcher.OnDHCPv6Configuration. -func (n *ndpDispatcher) OnDHCPv6Configuration(nicID tcpip.NICID, configuration stack.DHCPv6ConfigurationFromNDPRA) { - if c := n.dhcpv6ConfigurationC; c != nil { - c <- ndpDHCPv6Event{ - nicID, - configuration, - } - } -} - -// channelLinkWithHeaderLength is a channel.Endpoint with a configurable -// header length. -type channelLinkWithHeaderLength struct { - *channel.Endpoint - headerLength uint16 -} - -func (l *channelLinkWithHeaderLength) MaxHeaderLength() uint16 { - return l.headerLength -} - -// Check e to make sure that the event is for addr on nic with ID 1, and the -// resolved flag set to resolved with the specified err. -func checkDADEvent(e ndpDADEvent, nicID tcpip.NICID, addr tcpip.Address, resolved bool, err *tcpip.Error) string { - return cmp.Diff(ndpDADEvent{nicID: nicID, addr: addr, resolved: resolved, err: err}, e, cmp.AllowUnexported(e)) -} - -// TestDADDisabled tests that an address successfully resolves immediately -// when DAD is not enabled (the default for an empty stack.Options). -func TestDADDisabled(t *testing.T) { - const nicID = 1 - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPDisp: &ndpDisp, - } - - e := channel.New(0, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr1, err) - } - - // Should get the address immediately since we should not have performed - // DAD on it. - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr1, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected DAD event") - } - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(%d, %d) err = %s", nicID, header.IPv6ProtocolNumber, err) - } - if addr.Address != addr1 { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, addr, addr1) - } - - // We should not have sent any NDP NS messages. - if got := s.Stats().ICMP.V6PacketsSent.NeighborSolicit.Value(); got != 0 { - t.Fatalf("got NeighborSolicit = %d, want = 0", got) - } -} - -// TestDADResolve tests that an address successfully resolves after performing -// DAD for various values of DupAddrDetectTransmits and RetransmitTimer. -// Included in the subtests is a test to make sure that an invalid -// RetransmitTimer (<1ms) values get fixed to the default RetransmitTimer of 1s. -// This tests also validates the NDP NS packet that is transmitted. -func TestDADResolve(t *testing.T) { - const nicID = 1 - - tests := []struct { - name string - linkHeaderLen uint16 - dupAddrDetectTransmits uint8 - retransTimer time.Duration - expectedRetransmitTimer time.Duration - }{ - { - name: "1:1s:1s", - dupAddrDetectTransmits: 1, - retransTimer: time.Second, - expectedRetransmitTimer: time.Second, - }, - { - name: "2:1s:1s", - linkHeaderLen: 1, - dupAddrDetectTransmits: 2, - retransTimer: time.Second, - expectedRetransmitTimer: time.Second, - }, - { - name: "1:2s:2s", - linkHeaderLen: 2, - dupAddrDetectTransmits: 1, - retransTimer: 2 * time.Second, - expectedRetransmitTimer: 2 * time.Second, - }, - // 0s is an invalid RetransmitTimer timer and will be fixed to - // the default RetransmitTimer value of 1s. - { - name: "1:0s:1s", - linkHeaderLen: 3, - dupAddrDetectTransmits: 1, - retransTimer: 0, - expectedRetransmitTimer: time.Second, - }, - } - - for _, test := range tests { - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent), - } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPDisp: &ndpDisp, - } - opts.NDPConfigs.RetransmitTimer = test.retransTimer - opts.NDPConfigs.DupAddrDetectTransmits = test.dupAddrDetectTransmits - - e := channelLinkWithHeaderLength{ - Endpoint: channel.New(int(test.dupAddrDetectTransmits), 1280, linkAddr1), - headerLength: test.linkHeaderLen, - } - e.Endpoint.LinkEPCapabilities |= stack.CapabilityResolutionRequired - s := stack.New(opts) - if err := s.CreateNIC(nicID, &e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr1, err) - } - - // Address should not be considered bound to the NIC yet (DAD ongoing). - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - - // Make sure the address does not resolve before the resolution time has - // passed. - time.Sleep(test.expectedRetransmitTimer*time.Duration(test.dupAddrDetectTransmits) - defaultAsyncEventTimeout) - addr, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - - // Wait for DAD to resolve. - select { - case <-time.After(2 * defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD resolution") - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr1, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - } - addr, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if addr.Address != addr1 { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, addr, addr1) - } - - // Should not have sent any more NS messages. - if got := s.Stats().ICMP.V6PacketsSent.NeighborSolicit.Value(); got != uint64(test.dupAddrDetectTransmits) { - t.Fatalf("got NeighborSolicit = %d, want = %d", got, test.dupAddrDetectTransmits) - } - - // Validate the sent Neighbor Solicitation messages. - for i := uint8(0); i < test.dupAddrDetectTransmits; i++ { - p, _ := e.ReadContext(context.Background()) - - // Make sure its an IPv6 packet. - if p.Proto != header.IPv6ProtocolNumber { - t.Fatalf("got Proto = %d, want = %d", p.Proto, header.IPv6ProtocolNumber) - } - - // Make sure the right remote link address is used. - snmc := header.SolicitedNodeAddr(addr1) - if want := header.EthernetAddressFromMulticastIPv6Address(snmc); p.Route.RemoteLinkAddress != want { - t.Errorf("got remote link address = %s, want = %s", p.Route.RemoteLinkAddress, want) - } - - // Check NDP NS packet. - // - // As per RFC 4861 section 4.3, a possible option is the Source Link - // Layer option, but this option MUST NOT be included when the source - // address of the packet is the unspecified address. - checker.IPv6(t, p.Pkt.Header.View(), - checker.SrcAddr(header.IPv6Any), - checker.DstAddr(snmc), - checker.TTL(header.NDPHopLimit), - checker.NDPNS( - checker.NDPNSTargetAddress(addr1), - checker.NDPNSOptions(nil), - )) - - if l, want := p.Pkt.Header.AvailableLength(), int(test.linkHeaderLen); l != want { - t.Errorf("got p.Pkt.Header.AvailableLength() = %d; want = %d", l, want) - } - } - }) - } -} - -// TestDADFail tests to make sure that the DAD process fails if another node is -// detected to be performing DAD on the same address (receive an NS message from -// a node doing DAD for the same address), or if another node is detected to own -// the address already (receive an NA message for the tentative address). -func TestDADFail(t *testing.T) { - const nicID = 1 - - tests := []struct { - name string - makeBuf func(tgt tcpip.Address) buffer.Prependable - getStat func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter - }{ - { - "RxSolicit", - func(tgt tcpip.Address) buffer.Prependable { - hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborSolicitMinimumSize) - pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborSolicitMinimumSize)) - pkt.SetType(header.ICMPv6NeighborSolicit) - ns := header.NDPNeighborSolicit(pkt.NDPPayload()) - ns.SetTargetAddress(tgt) - snmc := header.SolicitedNodeAddr(tgt) - pkt.SetChecksum(header.ICMPv6Checksum(pkt, header.IPv6Any, snmc, buffer.VectorisedView{})) - payloadLength := hdr.UsedLength() - ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize)) - ip.Encode(&header.IPv6Fields{ - PayloadLength: uint16(payloadLength), - NextHeader: uint8(icmp.ProtocolNumber6), - HopLimit: 255, - SrcAddr: header.IPv6Any, - DstAddr: snmc, - }) - - return hdr - - }, - func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter { - return s.NeighborSolicit - }, - }, - { - "RxAdvert", - func(tgt tcpip.Address) buffer.Prependable { - naSize := header.ICMPv6NeighborAdvertMinimumSize + header.NDPLinkLayerAddressSize - hdr := buffer.NewPrependable(header.IPv6MinimumSize + naSize) - pkt := header.ICMPv6(hdr.Prepend(naSize)) - pkt.SetType(header.ICMPv6NeighborAdvert) - na := header.NDPNeighborAdvert(pkt.NDPPayload()) - na.SetSolicitedFlag(true) - na.SetOverrideFlag(true) - na.SetTargetAddress(tgt) - na.Options().Serialize(header.NDPOptionsSerializer{ - header.NDPTargetLinkLayerAddressOption(linkAddr1), - }) - pkt.SetChecksum(header.ICMPv6Checksum(pkt, tgt, header.IPv6AllNodesMulticastAddress, buffer.VectorisedView{})) - payloadLength := hdr.UsedLength() - ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize)) - ip.Encode(&header.IPv6Fields{ - PayloadLength: uint16(payloadLength), - NextHeader: uint8(icmp.ProtocolNumber6), - HopLimit: 255, - SrcAddr: tgt, - DstAddr: header.IPv6AllNodesMulticastAddress, - }) - - return hdr - - }, - func(s tcpip.ICMPv6ReceivedPacketStats) *tcpip.StatCounter { - return s.NeighborAdvert - }, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - } - ndpConfigs := stack.DefaultNDPConfigurations() - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - } - opts.NDPConfigs.RetransmitTimer = time.Second * 2 - - e := channel.New(0, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr1, err) - } - - // Address should not be considered bound to the NIC yet - // (DAD ongoing). - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - - // Receive a packet to simulate multiple nodes owning or - // attempting to own the same address. - hdr := test.makeBuf(addr1) - e.InjectInbound(header.IPv6ProtocolNumber, &stack.PacketBuffer{ - Data: hdr.View().ToVectorisedView(), - }) - - stat := test.getStat(s.Stats().ICMP.V6PacketsReceived) - if got := stat.Value(); got != 1 { - t.Fatalf("got stat = %d, want = 1", got) - } - - // Wait for DAD to fail and make sure the address did - // not get resolved. - select { - case <-time.After(time.Duration(ndpConfigs.DupAddrDetectTransmits)*ndpConfigs.RetransmitTimer + time.Second): - // If we don't get a failure event after the - // expected resolution time + extra 1s buffer, - // something is wrong. - t.Fatal("timed out waiting for DAD failure") - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr1, false, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - } - addr, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - - // Attempting to add the address again should not fail if the address's - // state was cleaned up when DAD failed. - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr1, err) - } - }) - } -} - -func TestDADStop(t *testing.T) { - const nicID = 1 - - tests := []struct { - name string - stopFn func(t *testing.T, s *stack.Stack) - skipFinalAddrCheck bool - }{ - // Tests to make sure that DAD stops when an address is removed. - { - name: "Remove address", - stopFn: func(t *testing.T, s *stack.Stack) { - if err := s.RemoveAddress(nicID, addr1); err != nil { - t.Fatalf("RemoveAddress(%d, %s): %s", nicID, addr1, err) - } - }, - }, - - // Tests to make sure that DAD stops when the NIC is disabled. - { - name: "Disable NIC", - stopFn: func(t *testing.T, s *stack.Stack) { - if err := s.DisableNIC(nicID); err != nil { - t.Fatalf("DisableNIC(%d): %s", nicID, err) - } - }, - }, - - // Tests to make sure that DAD stops when the NIC is removed. - { - name: "Remove NIC", - stopFn: func(t *testing.T, s *stack.Stack) { - if err := s.RemoveNIC(nicID); err != nil { - t.Fatalf("RemoveNIC(%d): %s", nicID, err) - } - }, - // The NIC is removed so we can't check its addresses after calling - // stopFn. - skipFinalAddrCheck: true, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - } - ndpConfigs := stack.NDPConfigurations{ - RetransmitTimer: time.Second, - DupAddrDetectTransmits: 2, - } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPDisp: &ndpDisp, - NDPConfigs: ndpConfigs, - } - - e := channel.New(0, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _): %s", nicID, err) - } - - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s): %s", nicID, header.IPv6ProtocolNumber, addr1, err) - } - - // Address should not be considered bound to the NIC yet (DAD ongoing). - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - - test.stopFn(t, s) - - // Wait for DAD to fail (since the address was removed during DAD). - select { - case <-time.After(time.Duration(ndpConfigs.DupAddrDetectTransmits)*ndpConfigs.RetransmitTimer + time.Second): - // If we don't get a failure event after the expected resolution - // time + extra 1s buffer, something is wrong. - t.Fatal("timed out waiting for DAD failure") - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr1, false, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - } - - if !test.skipFinalAddrCheck { - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Errorf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - } - - // Should not have sent more than 1 NS message. - if got := s.Stats().ICMP.V6PacketsSent.NeighborSolicit.Value(); got > 1 { - t.Errorf("got NeighborSolicit = %d, want <= 1", got) - } - }) - } -} - -// TestSetNDPConfigurationFailsForBadNICID tests to make sure we get an error if -// we attempt to update NDP configurations using an invalid NICID. -func TestSetNDPConfigurationFailsForBadNICID(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - }) - - // No NIC with ID 1 yet. - if got := s.SetNDPConfigurations(1, stack.NDPConfigurations{}); got != tcpip.ErrUnknownNICID { - t.Fatalf("got s.SetNDPConfigurations = %v, want = %s", got, tcpip.ErrUnknownNICID) - } -} - -// TestSetNDPConfigurations tests that we can update and use per-interface NDP -// configurations without affecting the default NDP configurations or other -// interfaces' configurations. -func TestSetNDPConfigurations(t *testing.T) { - const nicID1 = 1 - const nicID2 = 2 - const nicID3 = 3 - - tests := []struct { - name string - dupAddrDetectTransmits uint8 - retransmitTimer time.Duration - expectedRetransmitTimer time.Duration - }{ - { - "OK", - 1, - time.Second, - time.Second, - }, - { - "Invalid Retransmit Timer", - 1, - 0, - time.Second, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPDisp: &ndpDisp, - }) - - expectDADEvent := func(nicID tcpip.NICID, addr tcpip.Address) { - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatalf("expected DAD event for %s", addr) - } - } - - // This NIC(1)'s NDP configurations will be updated to - // be different from the default. - if err := s.CreateNIC(nicID1, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID1, err) - } - - // Created before updating NIC(1)'s NDP configurations - // but updating NIC(1)'s NDP configurations should not - // affect other existing NICs. - if err := s.CreateNIC(nicID2, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID2, err) - } - - // Update the NDP configurations on NIC(1) to use DAD. - configs := stack.NDPConfigurations{ - DupAddrDetectTransmits: test.dupAddrDetectTransmits, - RetransmitTimer: test.retransmitTimer, - } - if err := s.SetNDPConfigurations(nicID1, configs); err != nil { - t.Fatalf("got SetNDPConfigurations(%d, _) = %s", nicID1, err) - } - - // Created after updating NIC(1)'s NDP configurations - // but the stack's default NDP configurations should not - // have been updated. - if err := s.CreateNIC(nicID3, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID3, err) - } - - // Add addresses for each NIC. - if err := s.AddAddress(nicID1, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID1, header.IPv6ProtocolNumber, addr1, err) - } - if err := s.AddAddress(nicID2, header.IPv6ProtocolNumber, addr2); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID2, header.IPv6ProtocolNumber, addr2, err) - } - expectDADEvent(nicID2, addr2) - if err := s.AddAddress(nicID3, header.IPv6ProtocolNumber, addr3); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID3, header.IPv6ProtocolNumber, addr3, err) - } - expectDADEvent(nicID3, addr3) - - // Address should not be considered bound to NIC(1) yet - // (DAD ongoing). - addr, err := s.GetMainNICAddress(nicID1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID1, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID1, header.IPv6ProtocolNumber, addr, want) - } - - // Should get the address on NIC(2) and NIC(3) - // immediately since we should not have performed DAD on - // it as the stack was configured to not do DAD by - // default and we only updated the NDP configurations on - // NIC(1). - addr, err = s.GetMainNICAddress(nicID2, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID2, header.IPv6ProtocolNumber, err) - } - if addr.Address != addr2 { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = %s, want = %s", nicID2, header.IPv6ProtocolNumber, addr, addr2) - } - addr, err = s.GetMainNICAddress(nicID3, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID3, header.IPv6ProtocolNumber, err) - } - if addr.Address != addr3 { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = %s, want = %s", nicID3, header.IPv6ProtocolNumber, addr, addr3) - } - - // Sleep until right (500ms before) before resolution to - // make sure the address didn't resolve on NIC(1) yet. - const delta = 500 * time.Millisecond - time.Sleep(time.Duration(test.dupAddrDetectTransmits)*test.expectedRetransmitTimer - delta) - addr, err = s.GetMainNICAddress(nicID1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID1, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID1, header.IPv6ProtocolNumber, addr, want) - } - - // Wait for DAD to resolve. - select { - case <-time.After(2 * delta): - // We should get a resolution event after 500ms - // (delta) since we wait for 500ms less than the - // expected resolution time above to make sure - // that the address did not yet resolve. Waiting - // for 1s (2x delta) without a resolution event - // means something is wrong. - t.Fatal("timed out waiting for DAD resolution") - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID1, addr1, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - } - addr, err = s.GetMainNICAddress(nicID1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID1, header.IPv6ProtocolNumber, err) - } - if addr.Address != addr1 { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = %s, want = %s", nicID1, header.IPv6ProtocolNumber, addr, addr1) - } - }) - } -} - -// raBufWithOptsAndDHCPv6 returns a valid NDP Router Advertisement with options -// and DHCPv6 configurations specified. -func raBufWithOptsAndDHCPv6(ip tcpip.Address, rl uint16, managedAddress, otherConfigurations bool, optSer header.NDPOptionsSerializer) *stack.PacketBuffer { - icmpSize := header.ICMPv6HeaderSize + header.NDPRAMinimumSize + int(optSer.Length()) - hdr := buffer.NewPrependable(header.IPv6MinimumSize + icmpSize) - pkt := header.ICMPv6(hdr.Prepend(icmpSize)) - pkt.SetType(header.ICMPv6RouterAdvert) - pkt.SetCode(0) - raPayload := pkt.NDPPayload() - ra := header.NDPRouterAdvert(raPayload) - // Populate the Router Lifetime. - binary.BigEndian.PutUint16(raPayload[2:], rl) - // Populate the Managed Address flag field. - if managedAddress { - // The Managed Addresses flag field is the 7th bit of byte #1 (0-indexing) - // of the RA payload. - raPayload[1] |= (1 << 7) - } - // Populate the Other Configurations flag field. - if otherConfigurations { - // The Other Configurations flag field is the 6th bit of byte #1 - // (0-indexing) of the RA payload. - raPayload[1] |= (1 << 6) - } - opts := ra.Options() - opts.Serialize(optSer) - pkt.SetChecksum(header.ICMPv6Checksum(pkt, ip, header.IPv6AllNodesMulticastAddress, buffer.VectorisedView{})) - payloadLength := hdr.UsedLength() - iph := header.IPv6(hdr.Prepend(header.IPv6MinimumSize)) - iph.Encode(&header.IPv6Fields{ - PayloadLength: uint16(payloadLength), - NextHeader: uint8(icmp.ProtocolNumber6), - HopLimit: header.NDPHopLimit, - SrcAddr: ip, - DstAddr: header.IPv6AllNodesMulticastAddress, - }) - - return &stack.PacketBuffer{Data: hdr.View().ToVectorisedView()} -} - -// raBufWithOpts returns a valid NDP Router Advertisement with options. -// -// Note, raBufWithOpts does not populate any of the RA fields other than the -// Router Lifetime. -func raBufWithOpts(ip tcpip.Address, rl uint16, optSer header.NDPOptionsSerializer) *stack.PacketBuffer { - return raBufWithOptsAndDHCPv6(ip, rl, false, false, optSer) -} - -// raBufWithDHCPv6 returns a valid NDP Router Advertisement with DHCPv6 related -// fields set. -// -// Note, raBufWithDHCPv6 does not populate any of the RA fields other than the -// DHCPv6 related ones. -func raBufWithDHCPv6(ip tcpip.Address, managedAddresses, otherConfiguratiosns bool) *stack.PacketBuffer { - return raBufWithOptsAndDHCPv6(ip, 0, managedAddresses, otherConfiguratiosns, header.NDPOptionsSerializer{}) -} - -// raBuf returns a valid NDP Router Advertisement. -// -// Note, raBuf does not populate any of the RA fields other than the -// Router Lifetime. -func raBuf(ip tcpip.Address, rl uint16) *stack.PacketBuffer { - return raBufWithOpts(ip, rl, header.NDPOptionsSerializer{}) -} - -// raBufWithPI returns a valid NDP Router Advertisement with a single Prefix -// Information option. -// -// Note, raBufWithPI does not populate any of the RA fields other than the -// Router Lifetime. -func raBufWithPI(ip tcpip.Address, rl uint16, prefix tcpip.AddressWithPrefix, onLink, auto bool, vl, pl uint32) *stack.PacketBuffer { - flags := uint8(0) - if onLink { - // The OnLink flag is the 7th bit in the flags byte. - flags |= 1 << 7 - } - if auto { - // The Address Auto-Configuration flag is the 6th bit in the - // flags byte. - flags |= 1 << 6 - } - - // A valid header.NDPPrefixInformation must be 30 bytes. - buf := [30]byte{} - // The first byte in a header.NDPPrefixInformation is the Prefix Length - // field. - buf[0] = uint8(prefix.PrefixLen) - // The 2nd byte within a header.NDPPrefixInformation is the Flags field. - buf[1] = flags - // The Valid Lifetime field starts after the 2nd byte within a - // header.NDPPrefixInformation. - binary.BigEndian.PutUint32(buf[2:], vl) - // The Preferred Lifetime field starts after the 6th byte within a - // header.NDPPrefixInformation. - binary.BigEndian.PutUint32(buf[6:], pl) - // The Prefix Address field starts after the 14th byte within a - // header.NDPPrefixInformation. - copy(buf[14:], prefix.Address) - return raBufWithOpts(ip, rl, header.NDPOptionsSerializer{ - header.NDPPrefixInformation(buf[:]), - }) -} - -// TestNoRouterDiscovery tests that router discovery will not be performed if -// configured not to. -func TestNoRouterDiscovery(t *testing.T) { - // Being configured to discover routers means handle and - // discover are set to true and forwarding is set to false. - // This tests all possible combinations of the configurations, - // except for the configuration where handle = true, discover = - // true and forwarding = false (the required configuration to do - // router discovery) - that will done in other tests. - for i := 0; i < 7; i++ { - handle := i&1 != 0 - discover := i&2 != 0 - forwarding := i&4 == 0 - - t.Run(fmt.Sprintf("HandleRAs(%t), DiscoverDefaultRouters(%t), Forwarding(%t)", handle, discover, forwarding), func(t *testing.T) { - ndpDisp := ndpDispatcher{ - routerC: make(chan ndpRouterEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: handle, - DiscoverDefaultRouters: discover, - }, - NDPDisp: &ndpDisp, - }) - s.SetForwarding(forwarding) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Rx an RA with non-zero lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, 1000)) - select { - case <-ndpDisp.routerC: - t.Fatal("unexpectedly discovered a router when configured not to") - default: - } - }) - } -} - -// Check e to make sure that the event is for addr on nic with ID 1, and the -// discovered flag set to discovered. -func checkRouterEvent(e ndpRouterEvent, addr tcpip.Address, discovered bool) string { - return cmp.Diff(ndpRouterEvent{nicID: 1, addr: addr, discovered: discovered}, e, cmp.AllowUnexported(e)) -} - -// TestRouterDiscoveryDispatcherNoRemember tests that the stack does not -// remember a discovered router when the dispatcher asks it not to. -func TestRouterDiscoveryDispatcherNoRemember(t *testing.T) { - ndpDisp := ndpDispatcher{ - routerC: make(chan ndpRouterEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Receive an RA for a router we should not remember. - const lifetimeSeconds = 1 - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, lifetimeSeconds)) - select { - case e := <-ndpDisp.routerC: - if diff := checkRouterEvent(e, llAddr2, true); diff != "" { - t.Errorf("router event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected router discovery event") - } - - // Wait for the invalidation time plus some buffer to make sure we do - // not actually receive any invalidation events as we should not have - // remembered the router in the first place. - select { - case <-ndpDisp.routerC: - t.Fatal("should not have received any router events") - case <-time.After(lifetimeSeconds*time.Second + defaultTimeout): - } -} - -func TestRouterDiscovery(t *testing.T) { - ndpDisp := ndpDispatcher{ - routerC: make(chan ndpRouterEvent, 1), - rememberRouter: true, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - }, - NDPDisp: &ndpDisp, - }) - - expectRouterEvent := func(addr tcpip.Address, discovered bool) { - t.Helper() - - select { - case e := <-ndpDisp.routerC: - if diff := checkRouterEvent(e, addr, discovered); diff != "" { - t.Errorf("router event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected router discovery event") - } - } - - expectAsyncRouterInvalidationEvent := func(addr tcpip.Address, timeout time.Duration) { - t.Helper() - - select { - case e := <-ndpDisp.routerC: - if diff := checkRouterEvent(e, addr, false); diff != "" { - t.Errorf("router event mismatch (-want +got):\n%s", diff) - } - case <-time.After(timeout): - t.Fatal("timed out waiting for router discovery event") - } - } - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Rx an RA from lladdr2 with zero lifetime. It should not be - // remembered. - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, 0)) - select { - case <-ndpDisp.routerC: - t.Fatal("unexpectedly discovered a router with 0 lifetime") - default: - } - - // Rx an RA from lladdr2 with a huge lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, 1000)) - expectRouterEvent(llAddr2, true) - - // Rx an RA from another router (lladdr3) with non-zero lifetime. - const l3LifetimeSeconds = 6 - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr3, l3LifetimeSeconds)) - expectRouterEvent(llAddr3, true) - - // Rx an RA from lladdr2 with lesser lifetime. - const l2LifetimeSeconds = 2 - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, l2LifetimeSeconds)) - select { - case <-ndpDisp.routerC: - t.Fatal("Should not receive a router event when updating lifetimes for known routers") - default: - } - - // Wait for lladdr2's router invalidation timer to fire. The lifetime - // of the router should have been updated to the most recent (smaller) - // lifetime. - // - // Wait for the normal lifetime plus an extra bit for the - // router to get invalidated. If we don't get an invalidation - // event after this time, then something is wrong. - expectAsyncRouterInvalidationEvent(llAddr2, l2LifetimeSeconds*time.Second+defaultAsyncEventTimeout) - - // Rx an RA from lladdr2 with huge lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, 1000)) - expectRouterEvent(llAddr2, true) - - // Rx an RA from lladdr2 with zero lifetime. It should be invalidated. - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr2, 0)) - expectRouterEvent(llAddr2, false) - - // Wait for lladdr3's router invalidation timer to fire. The lifetime - // of the router should have been updated to the most recent (smaller) - // lifetime. - // - // Wait for the normal lifetime plus an extra bit for the - // router to get invalidated. If we don't get an invalidation - // event after this time, then something is wrong. - expectAsyncRouterInvalidationEvent(llAddr3, l3LifetimeSeconds*time.Second+defaultAsyncEventTimeout) -} - -// TestRouterDiscoveryMaxRouters tests that only -// stack.MaxDiscoveredDefaultRouters discovered routers are remembered. -func TestRouterDiscoveryMaxRouters(t *testing.T) { - ndpDisp := ndpDispatcher{ - routerC: make(chan ndpRouterEvent, 1), - rememberRouter: true, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Receive an RA from 2 more than the max number of discovered routers. - for i := 1; i <= stack.MaxDiscoveredDefaultRouters+2; i++ { - linkAddr := []byte{2, 2, 3, 4, 5, 0} - linkAddr[5] = byte(i) - llAddr := header.LinkLocalAddr(tcpip.LinkAddress(linkAddr)) - - e.InjectInbound(header.IPv6ProtocolNumber, raBuf(llAddr, 5)) - - if i <= stack.MaxDiscoveredDefaultRouters { - select { - case e := <-ndpDisp.routerC: - if diff := checkRouterEvent(e, llAddr, true); diff != "" { - t.Errorf("router event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected router discovery event") - } - - } else { - select { - case <-ndpDisp.routerC: - t.Fatal("should not have discovered a new router after we already discovered the max number of routers") - default: - } - } - } -} - -// TestNoPrefixDiscovery tests that prefix discovery will not be performed if -// configured not to. -func TestNoPrefixDiscovery(t *testing.T) { - prefix := tcpip.AddressWithPrefix{ - Address: tcpip.Address("\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x00"), - PrefixLen: 64, - } - - // Being configured to discover prefixes means handle and - // discover are set to true and forwarding is set to false. - // This tests all possible combinations of the configurations, - // except for the configuration where handle = true, discover = - // true and forwarding = false (the required configuration to do - // prefix discovery) - that will done in other tests. - for i := 0; i < 7; i++ { - handle := i&1 != 0 - discover := i&2 != 0 - forwarding := i&4 == 0 - - t.Run(fmt.Sprintf("HandleRAs(%t), DiscoverOnLinkPrefixes(%t), Forwarding(%t)", handle, discover, forwarding), func(t *testing.T) { - ndpDisp := ndpDispatcher{ - prefixC: make(chan ndpPrefixEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: handle, - DiscoverOnLinkPrefixes: discover, - }, - NDPDisp: &ndpDisp, - }) - s.SetForwarding(forwarding) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Rx an RA with prefix with non-zero lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, 10, 0)) - - select { - case <-ndpDisp.prefixC: - t.Fatal("unexpectedly discovered a prefix when configured not to") - default: - } - }) - } -} - -// Check e to make sure that the event is for prefix on nic with ID 1, and the -// discovered flag set to discovered. -func checkPrefixEvent(e ndpPrefixEvent, prefix tcpip.Subnet, discovered bool) string { - return cmp.Diff(ndpPrefixEvent{nicID: 1, prefix: prefix, discovered: discovered}, e, cmp.AllowUnexported(e)) -} - -// TestPrefixDiscoveryDispatcherNoRemember tests that the stack does not -// remember a discovered on-link prefix when the dispatcher asks it not to. -func TestPrefixDiscoveryDispatcherNoRemember(t *testing.T) { - prefix, subnet, _ := prefixSubnetAddr(0, "") - - ndpDisp := ndpDispatcher{ - prefixC: make(chan ndpPrefixEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: false, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Receive an RA with prefix that we should not remember. - const lifetimeSeconds = 1 - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, lifetimeSeconds, 0)) - select { - case e := <-ndpDisp.prefixC: - if diff := checkPrefixEvent(e, subnet, true); diff != "" { - t.Errorf("prefix event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected prefix discovery event") - } - - // Wait for the invalidation time plus some buffer to make sure we do - // not actually receive any invalidation events as we should not have - // remembered the prefix in the first place. - select { - case <-ndpDisp.prefixC: - t.Fatal("should not have received any prefix events") - case <-time.After(lifetimeSeconds*time.Second + defaultTimeout): - } -} - -func TestPrefixDiscovery(t *testing.T) { - prefix1, subnet1, _ := prefixSubnetAddr(0, "") - prefix2, subnet2, _ := prefixSubnetAddr(1, "") - prefix3, subnet3, _ := prefixSubnetAddr(2, "") - - ndpDisp := ndpDispatcher{ - prefixC: make(chan ndpPrefixEvent, 1), - rememberPrefix: true, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - expectPrefixEvent := func(prefix tcpip.Subnet, discovered bool) { - t.Helper() - - select { - case e := <-ndpDisp.prefixC: - if diff := checkPrefixEvent(e, prefix, discovered); diff != "" { - t.Errorf("prefix event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected prefix discovery event") - } - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with zero valid lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, false, 0, 0)) - select { - case <-ndpDisp.prefixC: - t.Fatal("unexpectedly discovered a prefix with 0 lifetime") - default: - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with non-zero lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, false, 100, 0)) - expectPrefixEvent(subnet1, true) - - // Receive an RA with prefix2 in a PI. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, false, 100, 0)) - expectPrefixEvent(subnet2, true) - - // Receive an RA with prefix3 in a PI. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix3, true, false, 100, 0)) - expectPrefixEvent(subnet3, true) - - // Receive an RA with prefix1 in a PI with lifetime = 0. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, false, 0, 0)) - expectPrefixEvent(subnet1, false) - - // Receive an RA with prefix2 in a PI with lesser lifetime. - lifetime := uint32(2) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, false, lifetime, 0)) - select { - case <-ndpDisp.prefixC: - t.Fatal("unexpectedly received prefix event when updating lifetime") - default: - } - - // Wait for prefix2's most recent invalidation timer plus some buffer to - // expire. - select { - case e := <-ndpDisp.prefixC: - if diff := checkPrefixEvent(e, subnet2, false); diff != "" { - t.Errorf("prefix event mismatch (-want +got):\n%s", diff) - } - case <-time.After(time.Duration(lifetime)*time.Second + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for prefix discovery event") - } - - // Receive RA to invalidate prefix3. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix3, true, false, 0, 0)) - expectPrefixEvent(subnet3, false) -} - -func TestPrefixDiscoveryWithInfiniteLifetime(t *testing.T) { - // Update the infinite lifetime value to a smaller value so we can test - // that when we receive a PI with such a lifetime value, we do not - // invalidate the prefix. - const testInfiniteLifetimeSeconds = 2 - const testInfiniteLifetime = testInfiniteLifetimeSeconds * time.Second - saved := header.NDPInfiniteLifetime - header.NDPInfiniteLifetime = testInfiniteLifetime - defer func() { - header.NDPInfiniteLifetime = saved - }() - - prefix := tcpip.AddressWithPrefix{ - Address: tcpip.Address("\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x00"), - PrefixLen: 64, - } - subnet := prefix.Subnet() - - ndpDisp := ndpDispatcher{ - prefixC: make(chan ndpPrefixEvent, 1), - rememberPrefix: true, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - expectPrefixEvent := func(prefix tcpip.Subnet, discovered bool) { - t.Helper() - - select { - case e := <-ndpDisp.prefixC: - if diff := checkPrefixEvent(e, prefix, discovered); diff != "" { - t.Errorf("prefix event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected prefix discovery event") - } - } - - // Receive an RA with prefix in an NDP Prefix Information option (PI) - // with infinite valid lifetime which should not get invalidated. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, testInfiniteLifetimeSeconds, 0)) - expectPrefixEvent(subnet, true) - select { - case <-ndpDisp.prefixC: - t.Fatal("unexpectedly invalidated a prefix with infinite lifetime") - case <-time.After(testInfiniteLifetime + defaultTimeout): - } - - // Receive an RA with finite lifetime. - // The prefix should get invalidated after 1s. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, testInfiniteLifetimeSeconds-1, 0)) - select { - case e := <-ndpDisp.prefixC: - if diff := checkPrefixEvent(e, subnet, false); diff != "" { - t.Errorf("prefix event mismatch (-want +got):\n%s", diff) - } - case <-time.After(testInfiniteLifetime): - t.Fatal("timed out waiting for prefix discovery event") - } - - // Receive an RA with finite lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, testInfiniteLifetimeSeconds-1, 0)) - expectPrefixEvent(subnet, true) - - // Receive an RA with prefix with an infinite lifetime. - // The prefix should not be invalidated. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, testInfiniteLifetimeSeconds, 0)) - select { - case <-ndpDisp.prefixC: - t.Fatal("unexpectedly invalidated a prefix with infinite lifetime") - case <-time.After(testInfiniteLifetime + defaultTimeout): - } - - // Receive an RA with a prefix with a lifetime value greater than the - // set infinite lifetime value. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, testInfiniteLifetimeSeconds+1, 0)) - select { - case <-ndpDisp.prefixC: - t.Fatal("unexpectedly invalidated a prefix with infinite lifetime") - case <-time.After((testInfiniteLifetimeSeconds+1)*time.Second + defaultTimeout): - } - - // Receive an RA with 0 lifetime. - // The prefix should get invalidated. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, false, 0, 0)) - expectPrefixEvent(subnet, false) -} - -// TestPrefixDiscoveryMaxRouters tests that only -// stack.MaxDiscoveredOnLinkPrefixes discovered on-link prefixes are remembered. -func TestPrefixDiscoveryMaxOnLinkPrefixes(t *testing.T) { - ndpDisp := ndpDispatcher{ - prefixC: make(chan ndpPrefixEvent, stack.MaxDiscoveredOnLinkPrefixes+3), - rememberPrefix: true, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: false, - DiscoverOnLinkPrefixes: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - optSer := make(header.NDPOptionsSerializer, stack.MaxDiscoveredOnLinkPrefixes+2) - prefixes := [stack.MaxDiscoveredOnLinkPrefixes + 2]tcpip.Subnet{} - - // Receive an RA with 2 more than the max number of discovered on-link - // prefixes. - for i := 0; i < stack.MaxDiscoveredOnLinkPrefixes+2; i++ { - prefixAddr := [16]byte{1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 0} - prefixAddr[7] = byte(i) - prefix := tcpip.AddressWithPrefix{ - Address: tcpip.Address(prefixAddr[:]), - PrefixLen: 64, - } - prefixes[i] = prefix.Subnet() - buf := [30]byte{} - buf[0] = uint8(prefix.PrefixLen) - buf[1] = 128 - binary.BigEndian.PutUint32(buf[2:], 10) - copy(buf[14:], prefix.Address) - - optSer[i] = header.NDPPrefixInformation(buf[:]) - } - - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithOpts(llAddr1, 0, optSer)) - for i := 0; i < stack.MaxDiscoveredOnLinkPrefixes+2; i++ { - if i < stack.MaxDiscoveredOnLinkPrefixes { - select { - case e := <-ndpDisp.prefixC: - if diff := checkPrefixEvent(e, prefixes[i], true); diff != "" { - t.Errorf("prefix event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected prefix discovery event") - } - } else { - select { - case <-ndpDisp.prefixC: - t.Fatal("should not have discovered a new prefix after we already discovered the max number of prefixes") - default: - } - } - } -} - -// Checks to see if list contains an IPv6 address, item. -func containsV6Addr(list []tcpip.ProtocolAddress, item tcpip.AddressWithPrefix) bool { - protocolAddress := tcpip.ProtocolAddress{ - Protocol: header.IPv6ProtocolNumber, - AddressWithPrefix: item, - } - - for _, i := range list { - if i == protocolAddress { - return true - } - } - - return false -} - -// TestNoAutoGenAddr tests that SLAAC is not performed when configured not to. -func TestNoAutoGenAddr(t *testing.T) { - prefix, _, _ := prefixSubnetAddr(0, "") - - // Being configured to auto-generate addresses means handle and - // autogen are set to true and forwarding is set to false. - // This tests all possible combinations of the configurations, - // except for the configuration where handle = true, autogen = - // true and forwarding = false (the required configuration to do - // SLAAC) - that will done in other tests. - for i := 0; i < 7; i++ { - handle := i&1 != 0 - autogen := i&2 != 0 - forwarding := i&4 == 0 - - t.Run(fmt.Sprintf("HandleRAs(%t), AutoGenAddr(%t), Forwarding(%t)", handle, autogen, forwarding), func(t *testing.T) { - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: handle, - AutoGenGlobalAddresses: autogen, - }, - NDPDisp: &ndpDisp, - }) - s.SetForwarding(forwarding) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Rx an RA with prefix with non-zero lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, false, true, 10, 0)) - - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly auto-generated an address when configured not to") - default: - } - }) - } -} - -// Check e to make sure that the event is for addr on nic with ID 1, and the -// event type is set to eventType. -func checkAutoGenAddrEvent(e ndpAutoGenAddrEvent, addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) string { - return cmp.Diff(ndpAutoGenAddrEvent{nicID: 1, addr: addr, eventType: eventType}, e, cmp.AllowUnexported(e)) -} - -// TestAutoGenAddr tests that an address is properly generated and invalidated -// when configured to do so. -func TestAutoGenAddr(t *testing.T) { - const newMinVL = 2 - newMinVLDuration := newMinVL * time.Second - saved := stack.MinPrefixInformationValidLifetimeForUpdate - defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = saved - }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration - - prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with zero valid lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 0, 0)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly auto-generated an address with 0 lifetime") - default: - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with non-zero lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 0)) - expectAutoGenAddrEvent(addr1, newAddr) - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr1) { - t.Fatalf("Should have %s in the list of addresses", addr1) - } - - // Receive an RA with prefix2 in an NDP Prefix Information option (PI) - // with preferred lifetime > valid lifetime - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 5, 6)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly auto-generated an address with preferred lifetime > valid lifetime") - default: - } - - // Receive an RA with prefix2 in a PI. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 0)) - expectAutoGenAddrEvent(addr2, newAddr) - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr1) { - t.Fatalf("Should have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr2) { - t.Fatalf("Should have %s in the list of addresses", addr2) - } - - // Refresh valid lifetime for addr of prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, newMinVL, 0)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly auto-generated an address when we already have an address for a prefix") - default: - } - - // Wait for addr of prefix1 to be invalidated. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr1, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(newMinVLDuration + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - if containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr1) { - t.Fatalf("Should not have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr2) { - t.Fatalf("Should have %s in the list of addresses", addr2) - } -} - -func addressCheck(addrs []tcpip.ProtocolAddress, containList, notContainList []tcpip.AddressWithPrefix) string { - ret := "" - for _, c := range containList { - if !containsV6Addr(addrs, c) { - ret += fmt.Sprintf("should have %s in the list of addresses\n", c) - } - } - for _, c := range notContainList { - if containsV6Addr(addrs, c) { - ret += fmt.Sprintf("should not have %s in the list of addresses\n", c) - } - } - return ret -} - -// TestAutoGenTempAddr tests that temporary SLAAC addresses are generated when -// configured to do so as part of IPv6 Privacy Extensions. -func TestAutoGenTempAddr(t *testing.T) { - const ( - nicID = 1 - newMinVL = 5 - newMinVLDuration = newMinVL * time.Second - ) - - savedMinPrefixInformationValidLifetimeForUpdate := stack.MinPrefixInformationValidLifetimeForUpdate - savedMaxDesync := stack.MaxDesyncFactor - defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = savedMinPrefixInformationValidLifetimeForUpdate - stack.MaxDesyncFactor = savedMaxDesync - }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration - stack.MaxDesyncFactor = time.Nanosecond - - prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) - - tests := []struct { - name string - dupAddrTransmits uint8 - retransmitTimer time.Duration - }{ - { - name: "DAD disabled", - }, - { - name: "DAD enabled", - dupAddrTransmits: 1, - retransmitTimer: time.Second, - }, - } - - // This Run will not return until the parallel tests finish. - // - // We need this because we need to do some teardown work after the - // parallel tests complete. - // - // See https://godoc.org/testing#hdr-Subtests_and_Sub_benchmarks for - // more details. - t.Run("group", func(t *testing.T) { - for i, test := range tests { - i := i - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - seed := []byte{uint8(i)} - var tempIIDHistory [header.IIDSize]byte - header.InitialTempIID(tempIIDHistory[:], seed, nicID) - newTempAddr := func(stableAddr tcpip.Address) tcpip.AddressWithPrefix { - return header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], stableAddr) - } - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 2), - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: test.dupAddrTransmits, - RetransmitTimer: test.retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - TempIIDSeed: seed, - }) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectAutoGenAddrEventAsync := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } - - expectDADEventAsync := func(addr tcpip.Address) { - t.Helper() - - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - case <-time.After(time.Duration(test.dupAddrTransmits)*test.retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD event") - } - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with zero valid lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 0, 0)) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpectedly auto-generated an address with 0 lifetime; event = %+v", e) - default: - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with non-zero valid lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 0)) - expectAutoGenAddrEvent(addr1, newAddr) - expectDADEventAsync(addr1.Address) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpectedly got an auto gen addr event = %+v", e) - default: - } - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with non-zero valid & preferred lifetimes. - tempAddr1 := newTempAddr(addr1.Address) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 100)) - expectAutoGenAddrEvent(tempAddr1, newAddr) - expectDADEventAsync(tempAddr1.Address) - if mismatch := addressCheck(s.NICInfo()[1].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1, tempAddr1}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Receive an RA with prefix2 in an NDP Prefix Information option (PI) - // with preferred lifetime > valid lifetime - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 5, 6)) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpectedly auto-generated an address with preferred lifetime > valid lifetime; event = %+v", e) - default: - } - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1, tempAddr1}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Receive an RA with prefix2 in a PI w/ non-zero valid and preferred - // lifetimes. - tempAddr2 := newTempAddr(addr2.Address) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 100)) - expectAutoGenAddrEvent(addr2, newAddr) - expectDADEventAsync(addr2.Address) - expectAutoGenAddrEventAsync(tempAddr2, newAddr) - expectDADEventAsync(tempAddr2.Address) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1, tempAddr1, addr2, tempAddr2}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Deprecate prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 0)) - expectAutoGenAddrEvent(addr1, deprecatedAddr) - expectAutoGenAddrEvent(tempAddr1, deprecatedAddr) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1, tempAddr1, addr2, tempAddr2}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Refresh lifetimes for prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 100)) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1, tempAddr1, addr2, tempAddr2}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Reduce valid lifetime and deprecate addresses of prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, newMinVL, 0)) - expectAutoGenAddrEvent(addr1, deprecatedAddr) - expectAutoGenAddrEvent(tempAddr1, deprecatedAddr) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr1, tempAddr1, addr2, tempAddr2}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Wait for addrs of prefix1 to be invalidated. They should be - // invalidated at the same time. - select { - case e := <-ndpDisp.autoGenAddrC: - var nextAddr tcpip.AddressWithPrefix - if e.addr == addr1 { - if diff := checkAutoGenAddrEvent(e, addr1, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - nextAddr = tempAddr1 - } else { - if diff := checkAutoGenAddrEvent(e, tempAddr1, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - nextAddr = addr1 - } - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, nextAddr, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - case <-time.After(newMinVLDuration + defaultTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr2, tempAddr2}, []tcpip.AddressWithPrefix{addr1, tempAddr1}); mismatch != "" { - t.Fatal(mismatch) - } - - // Receive an RA with prefix2 in a PI w/ 0 lifetimes. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 0, 0)) - expectAutoGenAddrEvent(addr2, deprecatedAddr) - expectAutoGenAddrEvent(tempAddr2, deprecatedAddr) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Errorf("got unexpected auto gen addr event = %+v", e) - default: - } - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr2, tempAddr2}, []tcpip.AddressWithPrefix{addr1, tempAddr1}); mismatch != "" { - t.Fatal(mismatch) - } - }) - } - }) -} - -// TestNoAutoGenTempAddrForLinkLocal test that temporary SLAAC addresses are not -// generated for auto generated link-local addresses. -func TestNoAutoGenTempAddrForLinkLocal(t *testing.T) { - const nicID = 1 - - savedMaxDesyncFactor := stack.MaxDesyncFactor - defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor - }() - stack.MaxDesyncFactor = time.Nanosecond - - tests := []struct { - name string - dupAddrTransmits uint8 - retransmitTimer time.Duration - }{ - { - name: "DAD disabled", - }, - { - name: "DAD enabled", - dupAddrTransmits: 1, - retransmitTimer: time.Second, - }, - } - - // This Run will not return until the parallel tests finish. - // - // We need this because we need to do some teardown work after the - // parallel tests complete. - // - // See https://godoc.org/testing#hdr-Subtests_and_Sub_benchmarks for - // more details. - t.Run("group", func(t *testing.T) { - for _, test := range tests { - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - AutoGenIPv6LinkLocal: true, - }) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - // The stable link-local address should auto-generate and resolve DAD. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, tcpip.AddressWithPrefix{Address: llAddr1, PrefixLen: header.IIDOffsetInIPv6Address * 8}, newAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, llAddr1, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - case <-time.After(time.Duration(test.dupAddrTransmits)*test.retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD event") - } - - // No new addresses should be generated. - select { - case e := <-ndpDisp.autoGenAddrC: - t.Errorf("got unxpected auto gen addr event = %+v", e) - case <-time.After(defaultAsyncEventTimeout): - } - }) - } - }) -} - -// TestNoAutoGenTempAddrWithoutStableAddr tests that a temporary SLAAC address -// will not be generated until after DAD completes, even if a new Router -// Advertisement is received to refresh lifetimes. -func TestNoAutoGenTempAddrWithoutStableAddr(t *testing.T) { - const ( - nicID = 1 - dadTransmits = 1 - retransmitTimer = 2 * time.Second - ) - - savedMaxDesyncFactor := stack.MaxDesyncFactor - defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor - }() - stack.MaxDesyncFactor = 0 - - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - var tempIIDHistory [header.IIDSize]byte - header.InitialTempIID(tempIIDHistory[:], nil, nicID) - tempAddr := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - // Receive an RA to trigger SLAAC for prefix. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, newAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - - // DAD on the stable address for prefix has not yet completed. Receiving a new - // RA that would refresh lifetimes should not generate a temporary SLAAC - // address for the prefix. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpected auto gen addr event = %+v", e) - default: - } - - // Wait for DAD to complete for the stable address then expect the temporary - // address to be generated. - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr.Address, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - case <-time.After(dadTransmits*retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD event") - } - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, tempAddr, newAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } -} - -// TestAutoGenTempAddrRegen tests that temporary SLAAC addresses are -// regenerated. -func TestAutoGenTempAddrRegen(t *testing.T) { - const ( - nicID = 1 - regenAfter = 2 * time.Second - newMinVL = 10 - newMinVLDuration = newMinVL * time.Second - ) - - savedMaxDesyncFactor := stack.MaxDesyncFactor - savedMinMaxTempAddrPreferredLifetime := stack.MinMaxTempAddrPreferredLifetime - savedMinMaxTempAddrValidLifetime := stack.MinMaxTempAddrValidLifetime - defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor - stack.MinMaxTempAddrPreferredLifetime = savedMinMaxTempAddrPreferredLifetime - stack.MinMaxTempAddrValidLifetime = savedMinMaxTempAddrValidLifetime - }() - stack.MaxDesyncFactor = 0 - stack.MinMaxTempAddrPreferredLifetime = newMinVLDuration - stack.MinMaxTempAddrValidLifetime = newMinVLDuration - - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - var tempIIDHistory [header.IIDSize]byte - header.InitialTempIID(tempIIDHistory[:], nil, nicID) - tempAddr1 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - tempAddr2 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - tempAddr3 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - ndpConfigs := stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - RegenAdvanceDuration: newMinVLDuration - regenAfter, - } - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectAutoGenAddrEventAsync := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType, timeout time.Duration) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(timeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with non-zero valid & preferred lifetimes. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - expectAutoGenAddrEvent(addr, newAddr) - expectAutoGenAddrEvent(tempAddr1, newAddr) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr, tempAddr1}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Wait for regeneration - expectAutoGenAddrEventAsync(tempAddr2, newAddr, regenAfter+defaultAsyncEventTimeout) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr, tempAddr1, tempAddr2}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Wait for regeneration - expectAutoGenAddrEventAsync(tempAddr3, newAddr, regenAfter+defaultAsyncEventTimeout) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr, tempAddr1, tempAddr2, tempAddr3}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Stop generating temporary addresses - ndpConfigs.AutoGenTempGlobalAddresses = false - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) - } - - // Wait for all the temporary addresses to get invalidated. - tempAddrs := []tcpip.AddressWithPrefix{tempAddr1, tempAddr2, tempAddr3} - invalidateAfter := newMinVLDuration - 2*regenAfter - for _, addr := range tempAddrs { - // Wait for a deprecation then invalidation event, or just an invalidation - // event. We need to cover both cases but cannot deterministically hit both - // cases because the deprecation and invalidation timers could fire in any - // order. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, deprecatedAddr); diff == "" { - // If we get a deprecation event first, we should get an invalidation - // event almost immediately after. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } else if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff == "" { - // If we get an invalidation event first, we shouldn't get a deprecation - // event after. - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpectedly got an auto-generated event = %+v", e) - case <-time.After(defaultTimeout): - } - } else { - t.Fatalf("got unexpected auto-generated event = %+v", e) - } - case <-time.After(invalidateAfter + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - - invalidateAfter = regenAfter - } - if mismatch := addressCheck(s.NICInfo()[1].ProtocolAddresses, []tcpip.AddressWithPrefix{addr}, tempAddrs); mismatch != "" { - t.Fatal(mismatch) - } -} - -// TestAutoGenTempAddrRegenTimerUpdates tests that a temporary address's -// regeneration timer gets updated when refreshing the address's lifetimes. -func TestAutoGenTempAddrRegenTimerUpdates(t *testing.T) { - const ( - nicID = 1 - regenAfter = 2 * time.Second - newMinVL = 10 - newMinVLDuration = newMinVL * time.Second - ) - - savedMaxDesyncFactor := stack.MaxDesyncFactor - savedMinMaxTempAddrPreferredLifetime := stack.MinMaxTempAddrPreferredLifetime - savedMinMaxTempAddrValidLifetime := stack.MinMaxTempAddrValidLifetime - defer func() { - stack.MaxDesyncFactor = savedMaxDesyncFactor - stack.MinMaxTempAddrPreferredLifetime = savedMinMaxTempAddrPreferredLifetime - stack.MinMaxTempAddrValidLifetime = savedMinMaxTempAddrValidLifetime - }() - stack.MaxDesyncFactor = 0 - stack.MinMaxTempAddrPreferredLifetime = newMinVLDuration - stack.MinMaxTempAddrValidLifetime = newMinVLDuration - - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - var tempIIDHistory [header.IIDSize]byte - header.InitialTempIID(tempIIDHistory[:], nil, nicID) - tempAddr1 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - tempAddr2 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - tempAddr3 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], addr.Address) - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - ndpConfigs := stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - RegenAdvanceDuration: newMinVLDuration - regenAfter, - } - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectAutoGenAddrEventAsync := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType, timeout time.Duration) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(timeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } - - // Receive an RA with prefix1 in an NDP Prefix Information option (PI) - // with non-zero valid & preferred lifetimes. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - expectAutoGenAddrEvent(addr, newAddr) - expectAutoGenAddrEvent(tempAddr1, newAddr) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, []tcpip.AddressWithPrefix{addr, tempAddr1}, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Deprecate the prefix. - // - // A new temporary address should be generated after the regeneration - // time has passed since the prefix is deprecated. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 0)) - expectAutoGenAddrEvent(addr, deprecatedAddr) - expectAutoGenAddrEvent(tempAddr1, deprecatedAddr) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpected auto gen addr event = %+v", e) - case <-time.After(regenAfter + defaultAsyncEventTimeout): - } - - // Prefer the prefix again. - // - // A new temporary address should immediately be generated since the - // regeneration time has already passed since the last address was generated - // - this regeneration does not depend on a timer. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - expectAutoGenAddrEvent(tempAddr2, newAddr) - - // Increase the maximum lifetimes for temporary addresses to large values - // then refresh the lifetimes of the prefix. - // - // A new address should not be generated after the regeneration time that was - // expected for the previous check. This is because the preferred lifetime for - // the temporary addresses has increased, so it will take more time to - // regenerate a new temporary address. Note, new addresses are only - // regenerated after the preferred lifetime - the regenerate advance duration - // as paased. - ndpConfigs.MaxTempAddrValidLifetime = 100 * time.Second - ndpConfigs.MaxTempAddrPreferredLifetime = 100 * time.Second - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) - } - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpected auto gen addr event = %+v", e) - case <-time.After(regenAfter + defaultAsyncEventTimeout): - } - - // Set the maximum lifetimes for temporary addresses such that on the next - // RA, the regeneration timer gets reset. - // - // The maximum lifetime is the sum of the minimum lifetimes for temporary - // addresses + the time that has already passed since the last address was - // generated so that the regeneration timer is needed to generate the next - // address. - newLifetimes := newMinVLDuration + regenAfter + defaultAsyncEventTimeout - ndpConfigs.MaxTempAddrValidLifetime = newLifetimes - ndpConfigs.MaxTempAddrPreferredLifetime = newLifetimes - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) - } - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - expectAutoGenAddrEventAsync(tempAddr3, newAddr, regenAfter+defaultAsyncEventTimeout) -} - -// TestMixedSLAACAddrConflictRegen tests SLAAC address regeneration in response -// to a mix of DAD conflicts and NIC-local conflicts. -func TestMixedSLAACAddrConflictRegen(t *testing.T) { - const ( - nicID = 1 - nicName = "nic" - lifetimeSeconds = 9999 - // From stack.maxSLAACAddrLocalRegenAttempts - maxSLAACAddrLocalRegenAttempts = 10 - // We use 2 more addreses than the maximum local regeneration attempts - // because we want to also trigger regeneration in response to a DAD - // conflicts for this test. - maxAddrs = maxSLAACAddrLocalRegenAttempts + 2 - dupAddrTransmits = 1 - retransmitTimer = time.Second - ) - - var tempIIDHistoryWithModifiedEUI64 [header.IIDSize]byte - header.InitialTempIID(tempIIDHistoryWithModifiedEUI64[:], nil, nicID) - - var tempIIDHistoryWithOpaqueIID [header.IIDSize]byte - header.InitialTempIID(tempIIDHistoryWithOpaqueIID[:], nil, nicID) - - prefix, subnet, stableAddrWithModifiedEUI64 := prefixSubnetAddr(0, linkAddr1) - var stableAddrsWithOpaqueIID [maxAddrs]tcpip.AddressWithPrefix - var tempAddrsWithOpaqueIID [maxAddrs]tcpip.AddressWithPrefix - var tempAddrsWithModifiedEUI64 [maxAddrs]tcpip.AddressWithPrefix - addrBytes := []byte(subnet.ID()) - for i := 0; i < maxAddrs; i++ { - stableAddrsWithOpaqueIID[i] = tcpip.AddressWithPrefix{ - Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet, nicName, uint8(i), nil)), - PrefixLen: header.IIDOffsetInIPv6Address * 8, - } - // When generating temporary addresses, the resolved stable address for the - // SLAAC prefix will be the first address stable address generated for the - // prefix as we will not simulate address conflicts for the stable addresses - // in tests involving temporary addresses. Address conflicts for stable - // addresses will be done in their own tests. - tempAddrsWithOpaqueIID[i] = header.GenerateTempIPv6SLAACAddr(tempIIDHistoryWithOpaqueIID[:], stableAddrsWithOpaqueIID[0].Address) - tempAddrsWithModifiedEUI64[i] = header.GenerateTempIPv6SLAACAddr(tempIIDHistoryWithModifiedEUI64[:], stableAddrWithModifiedEUI64.Address) - } - - tests := []struct { - name string - addrs []tcpip.AddressWithPrefix - tempAddrs bool - initialExpect tcpip.AddressWithPrefix - nicNameFromID func(tcpip.NICID, string) string - }{ - { - name: "Stable addresses with opaque IIDs", - addrs: stableAddrsWithOpaqueIID[:], - nicNameFromID: func(tcpip.NICID, string) string { - return nicName - }, - }, - { - name: "Temporary addresses with opaque IIDs", - addrs: tempAddrsWithOpaqueIID[:], - tempAddrs: true, - initialExpect: stableAddrsWithOpaqueIID[0], - nicNameFromID: func(tcpip.NICID, string) string { - return nicName - }, - }, - { - name: "Temporary addresses with modified EUI64", - addrs: tempAddrsWithModifiedEUI64[:], - tempAddrs: true, - initialExpect: stableAddrWithModifiedEUI64, - }, - } - - for _, test := range tests { - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - ndpConfigs := stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: test.tempAddrs, - AutoGenAddressConflictRetries: 1, - } - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: test.nicNameFromID, - }, - }) - - s.SetRouteTable([]tcpip.Route{{ - Destination: header.IPv6EmptySubnet, - Gateway: llAddr2, - NIC: nicID, - }}) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - for j := 0; j < len(test.addrs)-1; j++ { - // The NIC will not attempt to generate an address in response to a - // NIC-local conflict after some maximum number of attempts. We skip - // creating a conflict for the address that would be generated as part - // of the last attempt so we can simulate a DAD conflict for this - // address and restart the NIC-local generation process. - if j == maxSLAACAddrLocalRegenAttempts-1 { - continue - } - - if err := s.AddAddress(nicID, ipv6.ProtocolNumber, test.addrs[j].Address); err != nil { - t.Fatalf("s.AddAddress(%d, %d, %s): %s", nicID, ipv6.ProtocolNumber, test.addrs[j].Address, err) - } - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectAutoGenAddrAsyncEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } - - expectDADEventAsync := func(addr tcpip.Address) { - t.Helper() - - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - case <-time.After(dupAddrTransmits*retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD event") - } - } - - // Enable DAD. - ndpDisp.dadC = make(chan ndpDADEvent, 2) - ndpConfigs.DupAddrDetectTransmits = dupAddrTransmits - ndpConfigs.RetransmitTimer = retransmitTimer - if err := s.SetNDPConfigurations(nicID, ndpConfigs); err != nil { - t.Fatalf("s.SetNDPConfigurations(%d, _): %s", nicID, err) - } - - // Do SLAAC for prefix. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds)) - if test.initialExpect != (tcpip.AddressWithPrefix{}) { - expectAutoGenAddrEvent(test.initialExpect, newAddr) - expectDADEventAsync(test.initialExpect.Address) - } - - // The last local generation attempt should succeed, but we introduce a - // DAD failure to restart the local generation process. - addr := test.addrs[maxSLAACAddrLocalRegenAttempts-1] - expectAutoGenAddrAsyncEvent(addr, newAddr) - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected DAD event") - } - expectAutoGenAddrEvent(addr, invalidatedAddr) - - // The last address generated should resolve DAD. - addr = test.addrs[len(test.addrs)-1] - expectAutoGenAddrAsyncEvent(addr, newAddr) - expectDADEventAsync(addr.Address) - - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpected auto gen addr event = %+v", e) - default: - } - }) - } -} - -// stackAndNdpDispatcherWithDefaultRoute returns an ndpDispatcher, -// channel.Endpoint and stack.Stack. -// -// stack.Stack will have a default route through the router (llAddr3) installed -// and a static link-address (linkAddr3) added to the link address cache for the -// router. -func stackAndNdpDispatcherWithDefaultRoute(t *testing.T, nicID tcpip.NICID) (*ndpDispatcher, *channel.Endpoint, *stack.Stack) { - t.Helper() - ndpDisp := &ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: ndpDisp, - }) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - s.SetRouteTable([]tcpip.Route{{ - Destination: header.IPv6EmptySubnet, - Gateway: llAddr3, - NIC: nicID, - }}) - s.AddLinkAddress(nicID, llAddr3, linkAddr3) - return ndpDisp, e, s -} - -// addrForNewConnectionTo returns the local address used when creating a new -// connection to addr. -func addrForNewConnectionTo(t *testing.T, s *stack.Stack, addr tcpip.FullAddress) tcpip.Address { - t.Helper() - - wq := waiter.Queue{} - we, ch := waiter.NewChannelEntry(nil) - wq.EventRegister(&we, waiter.EventIn) - defer wq.EventUnregister(&we) - defer close(ch) - ep, err := s.NewEndpoint(header.UDPProtocolNumber, header.IPv6ProtocolNumber, &wq) - if err != nil { - t.Fatalf("s.NewEndpoint(%d, %d, _): %s", header.UDPProtocolNumber, header.IPv6ProtocolNumber, err) - } - defer ep.Close() - if err := ep.SetSockOptBool(tcpip.V6OnlyOption, true); err != nil { - t.Fatalf("SetSockOpt(tcpip.V6OnlyOption, true): %s", err) - } - if err := ep.Connect(addr); err != nil { - t.Fatalf("ep.Connect(%+v): %s", addr, err) - } - got, err := ep.GetLocalAddress() - if err != nil { - t.Fatalf("ep.GetLocalAddress(): %s", err) - } - return got.Addr -} - -// addrForNewConnection returns the local address used when creating a new -// connection. -func addrForNewConnection(t *testing.T, s *stack.Stack) tcpip.Address { - t.Helper() - - return addrForNewConnectionTo(t, s, dstAddr) -} - -// addrForNewConnectionWithAddr returns the local address used when creating a -// new connection with a specific local address. -func addrForNewConnectionWithAddr(t *testing.T, s *stack.Stack, addr tcpip.FullAddress) tcpip.Address { - t.Helper() - - wq := waiter.Queue{} - we, ch := waiter.NewChannelEntry(nil) - wq.EventRegister(&we, waiter.EventIn) - defer wq.EventUnregister(&we) - defer close(ch) - ep, err := s.NewEndpoint(header.UDPProtocolNumber, header.IPv6ProtocolNumber, &wq) - if err != nil { - t.Fatalf("s.NewEndpoint(%d, %d, _): %s", header.UDPProtocolNumber, header.IPv6ProtocolNumber, err) - } - defer ep.Close() - if err := ep.SetSockOptBool(tcpip.V6OnlyOption, true); err != nil { - t.Fatalf("SetSockOpt(tcpip.V6OnlyOption, true): %s", err) - } - if err := ep.Bind(addr); err != nil { - t.Fatalf("ep.Bind(%+v): %s", addr, err) - } - if err := ep.Connect(dstAddr); err != nil { - t.Fatalf("ep.Connect(%+v): %s", dstAddr, err) - } - got, err := ep.GetLocalAddress() - if err != nil { - t.Fatalf("ep.GetLocalAddress(): %s", err) - } - return got.Addr -} - -// TestAutoGenAddrDeprecateFromPI tests deprecating a SLAAC address when -// receiving a PI with 0 preferred lifetime. -func TestAutoGenAddrDeprecateFromPI(t *testing.T) { - const nicID = 1 - - prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) - - ndpDisp, e, s := stackAndNdpDispatcherWithDefaultRoute(t, nicID) - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectPrimaryAddr := func(addr tcpip.AddressWithPrefix) { - t.Helper() - - if got, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber); err != nil { - t.Fatalf("s.GetMainNICAddress(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) - } else if got != addr { - t.Errorf("got s.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, got, addr) - } - - if got := addrForNewConnection(t, s); got != addr.Address { - t.Errorf("got addrForNewConnection = %s, want = %s", got, addr.Address) - } - } - - // Receive PI for prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 100)) - expectAutoGenAddrEvent(addr1, newAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should have %s in the list of addresses", addr1) - } - expectPrimaryAddr(addr1) - - // Deprecate addr for prefix1 immedaitely. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 0)) - expectAutoGenAddrEvent(addr1, deprecatedAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should have %s in the list of addresses", addr1) - } - // addr should still be the primary endpoint as there are no other addresses. - expectPrimaryAddr(addr1) - - // Refresh lifetimes of addr generated from prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 100)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - expectPrimaryAddr(addr1) - - // Receive PI for prefix2. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 100)) - expectAutoGenAddrEvent(addr2, newAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - expectPrimaryAddr(addr2) - - // Deprecate addr for prefix2 immedaitely. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 0)) - expectAutoGenAddrEvent(addr2, deprecatedAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - // addr1 should be the primary endpoint now since addr2 is deprecated but - // addr1 is not. - expectPrimaryAddr(addr1) - // addr2 is deprecated but if explicitly requested, it should be used. - fullAddr2 := tcpip.FullAddress{Addr: addr2.Address, NIC: nicID} - if got := addrForNewConnectionWithAddr(t, s, fullAddr2); got != addr2.Address { - t.Errorf("got addrForNewConnectionWithAddr(_, _, %+v) = %s, want = %s", fullAddr2, got, addr2.Address) - } - - // Another PI w/ 0 preferred lifetime should not result in a deprecation - // event. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 0)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - expectPrimaryAddr(addr1) - if got := addrForNewConnectionWithAddr(t, s, fullAddr2); got != addr2.Address { - t.Errorf("got addrForNewConnectionWithAddr(_, _, %+v) = %s, want = %s", fullAddr2, got, addr2.Address) - } - - // Refresh lifetimes of addr generated from prefix2. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 100)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - expectPrimaryAddr(addr2) -} - -// TestAutoGenAddrTimerDeprecation tests that an address is properly deprecated -// when its preferred lifetime expires. -func TestAutoGenAddrTimerDeprecation(t *testing.T) { - const nicID = 1 - const newMinVL = 2 - newMinVLDuration := newMinVL * time.Second - saved := stack.MinPrefixInformationValidLifetimeForUpdate - defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = saved - }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVLDuration - - prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) - - ndpDisp, e, s := stackAndNdpDispatcherWithDefaultRoute(t, nicID) - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectAutoGenAddrEventAfter := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType, timeout time.Duration) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(timeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } - - expectPrimaryAddr := func(addr tcpip.AddressWithPrefix) { - t.Helper() - - if got, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber); err != nil { - t.Fatalf("s.GetMainNICAddress(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) - } else if got != addr { - t.Errorf("got s.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, got, addr) - } - - if got := addrForNewConnection(t, s); got != addr.Address { - t.Errorf("got addrForNewConnection = %s, want = %s", got, addr.Address) - } - } - - // Receive PI for prefix2. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 100)) - expectAutoGenAddrEvent(addr2, newAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - expectPrimaryAddr(addr2) - - // Receive a PI for prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, 100, 90)) - expectAutoGenAddrEvent(addr1, newAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - expectPrimaryAddr(addr1) - - // Refresh lifetime for addr of prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, newMinVL, newMinVL-1)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - expectPrimaryAddr(addr1) - - // Wait for addr of prefix1 to be deprecated. - expectAutoGenAddrEventAfter(addr1, deprecatedAddr, newMinVLDuration-time.Second+defaultAsyncEventTimeout) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should not have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - // addr2 should be the primary endpoint now since addr1 is deprecated but - // addr2 is not. - expectPrimaryAddr(addr2) - // addr1 is deprecated but if explicitly requested, it should be used. - fullAddr1 := tcpip.FullAddress{Addr: addr1.Address, NIC: nicID} - if got := addrForNewConnectionWithAddr(t, s, fullAddr1); got != addr1.Address { - t.Errorf("got addrForNewConnectionWithAddr(_, _, %+v) = %s, want = %s", fullAddr1, got, addr1.Address) - } - - // Refresh valid lifetime for addr of prefix1, w/ 0 preferred lifetime to make - // sure we do not get a deprecation event again. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, newMinVL, 0)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - expectPrimaryAddr(addr2) - if got := addrForNewConnectionWithAddr(t, s, fullAddr1); got != addr1.Address { - t.Errorf("got addrForNewConnectionWithAddr(_, _, %+v) = %s, want = %s", fullAddr1, got, addr1.Address) - } - - // Refresh lifetimes for addr of prefix1. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, newMinVL, newMinVL-1)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - // addr1 is the primary endpoint again since it is non-deprecated now. - expectPrimaryAddr(addr1) - - // Wait for addr of prefix1 to be deprecated. - expectAutoGenAddrEventAfter(addr1, deprecatedAddr, newMinVLDuration-time.Second+defaultAsyncEventTimeout) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should not have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - // addr2 should be the primary endpoint now since it is not deprecated. - expectPrimaryAddr(addr2) - if got := addrForNewConnectionWithAddr(t, s, fullAddr1); got != addr1.Address { - t.Errorf("got addrForNewConnectionWithAddr(_, _, %+v) = %s, want = %s", fullAddr1, got, addr1.Address) - } - - // Wait for addr of prefix1 to be invalidated. - expectAutoGenAddrEventAfter(addr1, invalidatedAddr, time.Second+defaultAsyncEventTimeout) - if containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should not have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - expectPrimaryAddr(addr2) - - // Refresh both lifetimes for addr of prefix2 to the same value. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, newMinVL, newMinVL)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - default: - } - - // Wait for a deprecation then invalidation events, or just an invalidation - // event. We need to cover both cases but cannot deterministically hit both - // cases because the deprecation and invalidation handlers could be handled in - // either deprecation then invalidation, or invalidation then deprecation - // (which should be cancelled by the invalidation handler). - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr2, deprecatedAddr); diff == "" { - // If we get a deprecation event first, we should get an invalidation - // event almost immediately after. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr2, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } else if diff := checkAutoGenAddrEvent(e, addr2, invalidatedAddr); diff == "" { - // If we get an invalidation event first, we should not get a deprecation - // event after. - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto-generated event") - case <-time.After(defaultTimeout): - } - } else { - t.Fatalf("got unexpected auto-generated event") - } - case <-time.After(newMinVLDuration + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - if containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should not have %s in the list of addresses", addr1) - } - if containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should not have %s in the list of addresses", addr2) - } - // Should not have any primary endpoints. - if got, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber); err != nil { - t.Fatalf("s.GetMainNICAddress(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) - } else if want := (tcpip.AddressWithPrefix{}); got != want { - t.Errorf("got s.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, got, want) - } - wq := waiter.Queue{} - we, ch := waiter.NewChannelEntry(nil) - wq.EventRegister(&we, waiter.EventIn) - defer wq.EventUnregister(&we) - defer close(ch) - ep, err := s.NewEndpoint(header.UDPProtocolNumber, header.IPv6ProtocolNumber, &wq) - if err != nil { - t.Fatalf("s.NewEndpoint(%d, %d, _): %s", header.UDPProtocolNumber, header.IPv6ProtocolNumber, err) - } - defer ep.Close() - if err := ep.SetSockOptBool(tcpip.V6OnlyOption, true); err != nil { - t.Fatalf("SetSockOpt(tcpip.V6OnlyOption, true): %s", err) - } - - if err := ep.Connect(dstAddr); err != tcpip.ErrNoRoute { - t.Errorf("got ep.Connect(%+v) = %v, want = %s", dstAddr, err, tcpip.ErrNoRoute) - } -} - -// Tests transitioning a SLAAC address's valid lifetime between finite and -// infinite values. -func TestAutoGenAddrFiniteToInfiniteToFiniteVL(t *testing.T) { - const infiniteVLSeconds = 2 - const minVLSeconds = 1 - savedIL := header.NDPInfiniteLifetime - savedMinVL := stack.MinPrefixInformationValidLifetimeForUpdate - defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = savedMinVL - header.NDPInfiniteLifetime = savedIL - }() - stack.MinPrefixInformationValidLifetimeForUpdate = minVLSeconds * time.Second - header.NDPInfiniteLifetime = infiniteVLSeconds * time.Second - - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - - tests := []struct { - name string - infiniteVL uint32 - }{ - { - name: "EqualToInfiniteVL", - infiniteVL: infiniteVLSeconds, - }, - // Our implementation supports changing header.NDPInfiniteLifetime for tests - // such that a packet can be received where the lifetime field has a value - // greater than header.NDPInfiniteLifetime. Because of this, we test to make - // sure that receiving a value greater than header.NDPInfiniteLifetime is - // handled the same as when receiving a value equal to - // header.NDPInfiniteLifetime. - { - name: "MoreThanInfiniteVL", - infiniteVL: infiniteVLSeconds + 1, - }, - } - - // This Run will not return until the parallel tests finish. - // - // We need this because we need to do some teardown work after the - // parallel tests complete. - // - // See https://godoc.org/testing#hdr-Subtests_and_Sub_benchmarks for - // more details. - t.Run("group", func(t *testing.T) { - for _, test := range tests { - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Receive an RA with finite prefix. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, minVLSeconds, 0)) - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, newAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - - default: - t.Fatal("expected addr auto gen event") - } - - // Receive an new RA with prefix with infinite VL. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, test.infiniteVL, 0)) - - // Receive a new RA with prefix with finite VL. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, minVLSeconds, 0)) - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - - case <-time.After(minVLSeconds*time.Second + defaultAsyncEventTimeout): - t.Fatal("timeout waiting for addr auto gen event") - } - }) - } - }) -} - -// TestAutoGenAddrValidLifetimeUpdates tests that the valid lifetime of an -// auto-generated address only gets updated when required to, as specified in -// RFC 4862 section 5.5.3.e. -func TestAutoGenAddrValidLifetimeUpdates(t *testing.T) { - const infiniteVL = 4294967295 - const newMinVL = 4 - saved := stack.MinPrefixInformationValidLifetimeForUpdate - defer func() { - stack.MinPrefixInformationValidLifetimeForUpdate = saved - }() - stack.MinPrefixInformationValidLifetimeForUpdate = newMinVL * time.Second - - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - - tests := []struct { - name string - ovl uint32 - nvl uint32 - evl uint32 - }{ - // Should update the VL to the minimum VL for updating if the - // new VL is less than newMinVL but was originally greater than - // it. - { - "LargeVLToVLLessThanMinVLForUpdate", - 9999, - 1, - newMinVL, - }, - { - "LargeVLTo0", - 9999, - 0, - newMinVL, - }, - { - "InfiniteVLToVLLessThanMinVLForUpdate", - infiniteVL, - 1, - newMinVL, - }, - { - "InfiniteVLTo0", - infiniteVL, - 0, - newMinVL, - }, - - // Should not update VL if original VL was less than newMinVL - // and the new VL is also less than newMinVL. - { - "ShouldNotUpdateWhenBothOldAndNewAreLessThanMinVLForUpdate", - newMinVL - 1, - newMinVL - 3, - newMinVL - 1, - }, - - // Should take the new VL if the new VL is greater than the - // remaining time or is greater than newMinVL. - { - "MorethanMinVLToLesserButStillMoreThanMinVLForUpdate", - newMinVL + 5, - newMinVL + 3, - newMinVL + 3, - }, - { - "SmallVLToGreaterVLButStillLessThanMinVLForUpdate", - newMinVL - 3, - newMinVL - 1, - newMinVL - 1, - }, - { - "SmallVLToGreaterVLThatIsMoreThaMinVLForUpdate", - newMinVL - 3, - newMinVL + 1, - newMinVL + 1, - }, - } - - // This Run will not return until the parallel tests finish. - // - // We need this because we need to do some teardown work after the - // parallel tests complete. - // - // See https://godoc.org/testing#hdr-Subtests_and_Sub_benchmarks for - // more details. - t.Run("group", func(t *testing.T) { - for _, test := range tests { - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 10), - } - e := channel.New(10, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Receive an RA with prefix with initial VL, - // test.ovl. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, test.ovl, 0)) - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, newAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - - // Receive an new RA with prefix with new VL, - // test.nvl. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, test.nvl, 0)) - - // - // Validate that the VL for the address got set - // to test.evl. - // - - // The address should not be invalidated until the effective valid - // lifetime has passed. - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly received an auto gen addr event") - case <-time.After(time.Duration(test.evl)*time.Second - defaultAsyncEventTimeout): - } - - // Wait for the invalidation event. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(2 * defaultAsyncEventTimeout): - t.Fatal("timeout waiting for addr auto gen event") - } - }) - } - }) -} - -// TestAutoGenAddrRemoval tests that when auto-generated addresses are removed -// by the user, its resources will be cleaned up and an invalidation event will -// be sent to the integrator. -func TestAutoGenAddrRemoval(t *testing.T) { - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - // Receive a PI to auto-generate an address. - const lifetimeSeconds = 1 - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, 0)) - expectAutoGenAddrEvent(addr, newAddr) - - // Removing the address should result in an invalidation event - // immediately. - if err := s.RemoveAddress(1, addr.Address); err != nil { - t.Fatalf("RemoveAddress(_, %s) = %s", addr.Address, err) - } - expectAutoGenAddrEvent(addr, invalidatedAddr) - - // Wait for the original valid lifetime to make sure the original timer - // got stopped/cleaned up. - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly received an auto gen addr event") - case <-time.After(lifetimeSeconds*time.Second + defaultTimeout): - } -} - -// TestAutoGenAddrAfterRemoval tests adding a SLAAC address that was previously -// assigned to the NIC but is in the permanentExpired state. -func TestAutoGenAddrAfterRemoval(t *testing.T) { - const nicID = 1 - - prefix1, _, addr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, _, addr2 := prefixSubnetAddr(1, linkAddr1) - ndpDisp, e, s := stackAndNdpDispatcherWithDefaultRoute(t, nicID) - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectPrimaryAddr := func(addr tcpip.AddressWithPrefix) { - t.Helper() - - if got, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber); err != nil { - t.Fatalf("s.GetMainNICAddress(%d, %d): %s", nicID, header.IPv6ProtocolNumber, err) - } else if got != addr { - t.Errorf("got s.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, got, addr) - } - - if got := addrForNewConnection(t, s); got != addr.Address { - t.Errorf("got addrForNewConnection = %s, want = %s", got, addr.Address) - } - } - - // Receive a PI to auto-generate addr1 with a large valid and preferred - // lifetime. - const largeLifetimeSeconds = 999 - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, 0, prefix1, true, true, largeLifetimeSeconds, largeLifetimeSeconds)) - expectAutoGenAddrEvent(addr1, newAddr) - expectPrimaryAddr(addr1) - - // Add addr2 as a static address. - protoAddr2 := tcpip.ProtocolAddress{ - Protocol: header.IPv6ProtocolNumber, - AddressWithPrefix: addr2, - } - if err := s.AddProtocolAddressWithOptions(nicID, protoAddr2, stack.FirstPrimaryEndpoint); err != nil { - t.Fatalf("AddProtocolAddressWithOptions(%d, %+v, %d) = %s", nicID, protoAddr2, stack.FirstPrimaryEndpoint, err) - } - // addr2 should be more preferred now since it is at the front of the primary - // list. - expectPrimaryAddr(addr2) - - // Get a route using addr2 to increment its reference count then remove it - // to leave it in the permanentExpired state. - r, err := s.FindRoute(nicID, addr2.Address, addr3, header.IPv6ProtocolNumber, false) - if err != nil { - t.Fatalf("FindRoute(%d, %s, %s, %d, false): %s", nicID, addr2.Address, addr3, header.IPv6ProtocolNumber, err) - } - defer r.Release() - if err := s.RemoveAddress(nicID, addr2.Address); err != nil { - t.Fatalf("s.RemoveAddress(%d, %s): %s", nicID, addr2.Address, err) - } - // addr1 should be preferred again since addr2 is in the expired state. - expectPrimaryAddr(addr1) - - // Receive a PI to auto-generate addr2 as valid and preferred. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, 0, prefix2, true, true, largeLifetimeSeconds, largeLifetimeSeconds)) - expectAutoGenAddrEvent(addr2, newAddr) - // addr2 should be more preferred now that it is closer to the front of the - // primary list and not deprecated. - expectPrimaryAddr(addr2) - - // Removing the address should result in an invalidation event immediately. - // It should still be in the permanentExpired state because r is still held. - // - // We remove addr2 here to make sure addr2 was marked as a SLAAC address - // (it was previously marked as a static address). - if err := s.RemoveAddress(1, addr2.Address); err != nil { - t.Fatalf("RemoveAddress(_, %s) = %s", addr2.Address, err) - } - expectAutoGenAddrEvent(addr2, invalidatedAddr) - // addr1 should be more preferred since addr2 is in the expired state. - expectPrimaryAddr(addr1) - - // Receive a PI to auto-generate addr2 as valid and deprecated. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, 0, prefix2, true, true, largeLifetimeSeconds, 0)) - expectAutoGenAddrEvent(addr2, newAddr) - // addr1 should still be more preferred since addr2 is deprecated, even though - // it is closer to the front of the primary list. - expectPrimaryAddr(addr1) - - // Receive a PI to refresh addr2's preferred lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, 0, prefix2, true, true, largeLifetimeSeconds, largeLifetimeSeconds)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly got an auto gen addr event") - default: - } - // addr2 should be more preferred now that it is not deprecated. - expectPrimaryAddr(addr2) - - if err := s.RemoveAddress(1, addr2.Address); err != nil { - t.Fatalf("RemoveAddress(_, %s) = %s", addr2.Address, err) - } - expectAutoGenAddrEvent(addr2, invalidatedAddr) - expectPrimaryAddr(addr1) -} - -// TestAutoGenAddrStaticConflict tests that if SLAAC generates an address that -// is already assigned to the NIC, the static address remains. -func TestAutoGenAddrStaticConflict(t *testing.T) { - prefix, _, addr := prefixSubnetAddr(0, linkAddr1) - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - // Add the address as a static address before SLAAC tries to add it. - if err := s.AddProtocolAddress(1, tcpip.ProtocolAddress{Protocol: header.IPv6ProtocolNumber, AddressWithPrefix: addr}); err != nil { - t.Fatalf("AddAddress(_, %d, %s) = %s", header.IPv6ProtocolNumber, addr.Address, err) - } - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr) { - t.Fatalf("Should have %s in the list of addresses", addr1) - } - - // Receive a PI where the generated address will be the same as the one - // that we already have assigned statically. - const lifetimeSeconds = 1 - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, 0)) - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly received an auto gen addr event for an address we already have statically") - default: - } - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr) { - t.Fatalf("Should have %s in the list of addresses", addr1) - } - - // Should not get an invalidation event after the PI's invalidation - // time. - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly received an auto gen addr event") - case <-time.After(lifetimeSeconds*time.Second + defaultTimeout): - } - if !containsV6Addr(s.NICInfo()[1].ProtocolAddresses, addr) { - t.Fatalf("Should have %s in the list of addresses", addr1) - } -} - -// TestAutoGenAddrWithOpaqueIID tests that SLAAC generated addresses will use -// opaque interface identifiers when configured to do so. -func TestAutoGenAddrWithOpaqueIID(t *testing.T) { - const nicID = 1 - const nicName = "nic1" - var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes]byte - secretKey := secretKeyBuf[:] - n, err := rand.Read(secretKey) - if err != nil { - t.Fatalf("rand.Read(_): %s", err) - } - if n != header.OpaqueIIDSecretKeyMinBytes { - t.Fatalf("got rand.Read(_) = (%d, _), want = (%d, _)", n, header.OpaqueIIDSecretKeyMinBytes) - } - - prefix1, subnet1, _ := prefixSubnetAddr(0, linkAddr1) - prefix2, subnet2, _ := prefixSubnetAddr(1, linkAddr1) - // addr1 and addr2 are the addresses that are expected to be generated when - // stack.Stack is configured to generate opaque interface identifiers as - // defined by RFC 7217. - addrBytes := []byte(subnet1.ID()) - addr1 := tcpip.AddressWithPrefix{ - Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet1, nicName, 0, secretKey)), - PrefixLen: 64, - } - addrBytes = []byte(subnet2.ID()) - addr2 := tcpip.AddressWithPrefix{ - Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet2, nicName, 0, secretKey)), - PrefixLen: 64, - } - - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName - }, - SecretKey: secretKey, - }, - }) - opts := stack.NICOptions{Name: nicName} - if err := s.CreateNICWithOptions(nicID, e, opts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v, _) = %s", nicID, opts, err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - // Receive an RA with prefix1 in a PI. - const validLifetimeSecondPrefix1 = 1 - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix1, true, true, validLifetimeSecondPrefix1, 0)) - expectAutoGenAddrEvent(addr1, newAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should have %s in the list of addresses", addr1) - } - - // Receive an RA with prefix2 in a PI with a large valid lifetime. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix2, true, true, 100, 0)) - expectAutoGenAddrEvent(addr2, newAddr) - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } - - // Wait for addr of prefix1 to be invalidated. - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr1, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(validLifetimeSecondPrefix1*time.Second + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - if containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr1) { - t.Fatalf("should not have %s in the list of addresses", addr1) - } - if !containsV6Addr(s.NICInfo()[nicID].ProtocolAddresses, addr2) { - t.Fatalf("should have %s in the list of addresses", addr2) - } -} - -func TestAutoGenAddrInResponseToDADConflicts(t *testing.T) { - const nicID = 1 - const nicName = "nic" - const dadTransmits = 1 - const retransmitTimer = time.Second - const maxMaxRetries = 3 - const lifetimeSeconds = 10 - - // Needed for the temporary address sub test. - savedMaxDesync := stack.MaxDesyncFactor - defer func() { - stack.MaxDesyncFactor = savedMaxDesync - }() - stack.MaxDesyncFactor = time.Nanosecond - - var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes]byte - secretKey := secretKeyBuf[:] - n, err := rand.Read(secretKey) - if err != nil { - t.Fatalf("rand.Read(_): %s", err) - } - if n != header.OpaqueIIDSecretKeyMinBytes { - t.Fatalf("got rand.Read(_) = (%d, _), want = (%d, _)", n, header.OpaqueIIDSecretKeyMinBytes) - } - - prefix, subnet, _ := prefixSubnetAddr(0, linkAddr1) - - addrForSubnet := func(subnet tcpip.Subnet, dadCounter uint8) tcpip.AddressWithPrefix { - addrBytes := []byte(subnet.ID()) - return tcpip.AddressWithPrefix{ - Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet, nicName, dadCounter, secretKey)), - PrefixLen: 64, - } - } - - expectAutoGenAddrEvent := func(t *testing.T, ndpDisp *ndpDispatcher, addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - expectAutoGenAddrEventAsync := func(t *testing.T, ndpDisp *ndpDispatcher, addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for addr auto gen event") - } - } - - expectDADEvent := func(t *testing.T, ndpDisp *ndpDispatcher, addr tcpip.Address, resolved bool) { - t.Helper() - - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr, resolved, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected DAD event") - } - } - - expectDADEventAsync := func(t *testing.T, ndpDisp *ndpDispatcher, addr tcpip.Address, resolved bool) { - t.Helper() - - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr, resolved, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - case <-time.After(dadTransmits*retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD event") - } - } - - stableAddrForTempAddrTest := addrForSubnet(subnet, 0) - - addrTypes := []struct { - name string - ndpConfigs stack.NDPConfigurations - autoGenLinkLocal bool - prepareFn func(t *testing.T, ndpDisp *ndpDispatcher, e *channel.Endpoint, tempIIDHistory []byte) []tcpip.AddressWithPrefix - addrGenFn func(dadCounter uint8, tempIIDHistory []byte) tcpip.AddressWithPrefix - }{ - { - name: "Global address", - ndpConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - }, - prepareFn: func(_ *testing.T, _ *ndpDispatcher, e *channel.Endpoint, _ []byte) []tcpip.AddressWithPrefix { - // Receive an RA with prefix1 in a PI. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds)) - return nil - - }, - addrGenFn: func(dadCounter uint8, _ []byte) tcpip.AddressWithPrefix { - return addrForSubnet(subnet, dadCounter) - }, - }, - { - name: "LinkLocal address", - ndpConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - }, - autoGenLinkLocal: true, - prepareFn: func(*testing.T, *ndpDispatcher, *channel.Endpoint, []byte) []tcpip.AddressWithPrefix { - return nil - }, - addrGenFn: func(dadCounter uint8, _ []byte) tcpip.AddressWithPrefix { - return addrForSubnet(header.IPv6LinkLocalPrefix.Subnet(), dadCounter) - }, - }, - { - name: "Temporary address", - ndpConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - prepareFn: func(t *testing.T, ndpDisp *ndpDispatcher, e *channel.Endpoint, tempIIDHistory []byte) []tcpip.AddressWithPrefix { - header.InitialTempIID(tempIIDHistory, nil, nicID) - - // Generate a stable SLAAC address so temporary addresses will be - // generated. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, 100, 100)) - expectAutoGenAddrEvent(t, ndpDisp, stableAddrForTempAddrTest, newAddr) - expectDADEventAsync(t, ndpDisp, stableAddrForTempAddrTest.Address, true) - - // The stable address will be assigned throughout the test. - return []tcpip.AddressWithPrefix{stableAddrForTempAddrTest} - }, - addrGenFn: func(_ uint8, tempIIDHistory []byte) tcpip.AddressWithPrefix { - return header.GenerateTempIPv6SLAACAddr(tempIIDHistory, stableAddrForTempAddrTest.Address) - }, - }, - } - - for _, addrType := range addrTypes { - // This Run will not return until the parallel tests finish. - // - // We need this because we need to do some teardown work after the parallel - // tests complete and limit the number of parallel tests running at the same - // time to reduce flakes. - // - // See https://godoc.org/testing#hdr-Subtests_and_Sub_benchmarks for - // more details. - t.Run(addrType.name, func(t *testing.T) { - for maxRetries := uint8(0); maxRetries <= maxMaxRetries; maxRetries++ { - for numFailures := uint8(0); numFailures <= maxRetries+1; numFailures++ { - maxRetries := maxRetries - numFailures := numFailures - addrType := addrType - - t.Run(fmt.Sprintf("%d max retries and %d failures", maxRetries, numFailures), func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - ndpConfigs := addrType.ndpConfigs - ndpConfigs.AutoGenAddressConflictRetries = maxRetries - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName - }, - SecretKey: secretKey, - }, - }) - opts := stack.NICOptions{Name: nicName} - if err := s.CreateNICWithOptions(nicID, e, opts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, opts, err) - } - - var tempIIDHistory [header.IIDSize]byte - stableAddrs := addrType.prepareFn(t, &ndpDisp, e, tempIIDHistory[:]) - - // Simulate DAD conflicts so the address is regenerated. - for i := uint8(0); i < numFailures; i++ { - addr := addrType.addrGenFn(i, tempIIDHistory[:]) - expectAutoGenAddrEventAsync(t, &ndpDisp, addr, newAddr) - - // Should not have any new addresses assigned to the NIC. - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, stableAddrs, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // Simulate a DAD conflict. - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } - expectAutoGenAddrEvent(t, &ndpDisp, addr, invalidatedAddr) - expectDADEvent(t, &ndpDisp, addr.Address, false) - - // Attempting to add the address manually should not fail if the - // address's state was cleaned up when DAD failed. - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr.Address); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr.Address, err) - } - if err := s.RemoveAddress(nicID, addr.Address); err != nil { - t.Fatalf("RemoveAddress(%d, %s) = %s", nicID, addr.Address, err) - } - expectDADEvent(t, &ndpDisp, addr.Address, false) - } - - // Should not have any new addresses assigned to the NIC. - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, stableAddrs, nil); mismatch != "" { - t.Fatal(mismatch) - } - - // If we had less failures than generation attempts, we should have - // an address after DAD resolves. - if maxRetries+1 > numFailures { - addr := addrType.addrGenFn(numFailures, tempIIDHistory[:]) - expectAutoGenAddrEventAsync(t, &ndpDisp, addr, newAddr) - expectDADEventAsync(t, &ndpDisp, addr.Address, true) - if mismatch := addressCheck(s.NICInfo()[nicID].ProtocolAddresses, append(stableAddrs, addr), nil); mismatch != "" { - t.Fatal(mismatch) - } - } - - // Should not attempt address generation again. - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpectedly got an auto-generated address event = %+v", e) - case <-time.After(defaultAsyncEventTimeout): - } - }) - } - } - }) - } -} - -// TestAutoGenAddrWithEUI64IIDNoDADRetries tests that a regeneration attempt is -// not made for SLAAC addresses generated with an IID based on the NIC's link -// address. -func TestAutoGenAddrWithEUI64IIDNoDADRetries(t *testing.T) { - const nicID = 1 - const dadTransmits = 1 - const retransmitTimer = time.Second - const maxRetries = 3 - const lifetimeSeconds = 10 - - prefix, subnet, _ := prefixSubnetAddr(0, linkAddr1) - - addrTypes := []struct { - name string - ndpConfigs stack.NDPConfigurations - autoGenLinkLocal bool - subnet tcpip.Subnet - triggerSLAACFn func(e *channel.Endpoint) - }{ - { - name: "Global address", - ndpConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenAddressConflictRetries: maxRetries, - }, - subnet: subnet, - triggerSLAACFn: func(e *channel.Endpoint) { - // Receive an RA with prefix1 in a PI. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds)) - - }, - }, - { - name: "LinkLocal address", - ndpConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - AutoGenAddressConflictRetries: maxRetries, - }, - autoGenLinkLocal: true, - subnet: header.IPv6LinkLocalPrefix.Subnet(), - triggerSLAACFn: func(e *channel.Endpoint) {}, - }, - } - - for _, addrType := range addrTypes { - addrType := addrType - - t.Run(addrType.name, func(t *testing.T) { - t.Parallel() - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal, - NDPConfigs: addrType.ndpConfigs, - NDPDisp: &ndpDisp, - }) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - addrType.triggerSLAACFn(e) - - addrBytes := []byte(addrType.subnet.ID()) - header.EthernetAdddressToModifiedEUI64IntoBuf(linkAddr1, addrBytes[header.IIDOffsetInIPv6Address:]) - addr := tcpip.AddressWithPrefix{ - Address: tcpip.Address(addrBytes), - PrefixLen: 64, - } - expectAutoGenAddrEvent(addr, newAddr) - - // Simulate a DAD conflict. - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } - expectAutoGenAddrEvent(addr, invalidatedAddr) - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected DAD event") - } - - // Should not attempt address regeneration. - select { - case e := <-ndpDisp.autoGenAddrC: - t.Fatalf("unexpectedly got an auto-generated address event = %+v", e) - case <-time.After(defaultAsyncEventTimeout): - } - }) - } -} - -// TestAutoGenAddrContinuesLifetimesAfterRetry tests that retrying address -// generation in response to DAD conflicts does not refresh the lifetimes. -func TestAutoGenAddrContinuesLifetimesAfterRetry(t *testing.T) { - const nicID = 1 - const nicName = "nic" - const dadTransmits = 1 - const retransmitTimer = 2 * time.Second - const failureTimer = time.Second - const maxRetries = 1 - const lifetimeSeconds = 5 - - var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes]byte - secretKey := secretKeyBuf[:] - n, err := rand.Read(secretKey) - if err != nil { - t.Fatalf("rand.Read(_): %s", err) - } - if n != header.OpaqueIIDSecretKeyMinBytes { - t.Fatalf("got rand.Read(_) = (%d, _), want = (%d, _)", n, header.OpaqueIIDSecretKeyMinBytes) - } - - prefix, subnet, _ := prefixSubnetAddr(0, linkAddr1) - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent, 1), - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenAddressConflictRetries: maxRetries, - }, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName - }, - SecretKey: secretKey, - }, - }) - opts := stack.NICOptions{Name: nicName} - if err := s.CreateNICWithOptions(nicID, e, opts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, opts, err) - } - - expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) { - t.Helper() - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } - - // Receive an RA with prefix in a PI. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds)) - - addrBytes := []byte(subnet.ID()) - addr := tcpip.AddressWithPrefix{ - Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet, nicName, 0, secretKey)), - PrefixLen: 64, - } - expectAutoGenAddrEvent(addr, newAddr) - - // Simulate a DAD conflict after some time has passed. - time.Sleep(failureTimer) - if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil { - t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err) - } - expectAutoGenAddrEvent(addr, invalidatedAddr) - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected DAD event") - } - - // Let the next address resolve. - addr.Address = tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet, nicName, 1, secretKey)) - expectAutoGenAddrEvent(addr, newAddr) - select { - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr.Address, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - case <-time.After(dadTransmits*retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD event") - } - - // Address should be deprecated/invalidated after the lifetime expires. - // - // Note, the remaining lifetime is calculated from when the PI was first - // processed. Since we wait for some time before simulating a DAD conflict - // and more time for the new address to resolve, the new address is only - // expected to be valid for the remaining time. The DAD conflict should - // not have reset the lifetimes. - // - // We expect either just the invalidation event or the deprecation event - // followed by the invalidation event. - select { - case e := <-ndpDisp.autoGenAddrC: - if e.eventType == deprecatedAddr { - if diff := checkAutoGenAddrEvent(e, addr, deprecatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - case <-time.After(defaultAsyncEventTimeout): - t.Fatal("timed out waiting for invalidated auto gen addr event after deprecation") - } - } else { - if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - } - case <-time.After(lifetimeSeconds*time.Second - failureTimer - dadTransmits*retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for auto gen addr event") - } -} - -// TestNDPRecursiveDNSServerDispatch tests that we properly dispatch an event -// to the integrator when an RA is received with the NDP Recursive DNS Server -// option with at least one valid address. -func TestNDPRecursiveDNSServerDispatch(t *testing.T) { - tests := []struct { - name string - opt header.NDPRecursiveDNSServer - expected *ndpRDNSS - }{ - { - "Unspecified", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 2, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - }), - nil, - }, - { - "Multicast", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 2, - 255, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, - }), - nil, - }, - { - "OptionTooSmall", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 2, - 1, 2, 3, 4, 5, 6, 7, 8, - }), - nil, - }, - { - "0Addresses", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 2, - }), - nil, - }, - { - "Valid1Address", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 2, - 1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 1, - }), - &ndpRDNSS{ - []tcpip.Address{ - "\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x01", - }, - 2 * time.Second, - }, - }, - { - "Valid2Addresses", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 1, - 1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 1, - 1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 2, - }), - &ndpRDNSS{ - []tcpip.Address{ - "\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x01", - "\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x02", - }, - time.Second, - }, - }, - { - "Valid3Addresses", - header.NDPRecursiveDNSServer([]byte{ - 0, 0, - 0, 0, 0, 0, - 1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 1, - 1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 2, - 1, 2, 3, 4, 5, 6, 7, 8, 0, 0, 0, 0, 0, 0, 0, 3, - }), - &ndpRDNSS{ - []tcpip.Address{ - "\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x01", - "\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x02", - "\x01\x02\x03\x04\x05\x06\x07\x08\x00\x00\x00\x00\x00\x00\x00\x03", - }, - 0, - }, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - ndpDisp := ndpDispatcher{ - // We do not expect more than a single RDNSS - // event at any time for this test. - rdnssC: make(chan ndpRDNSSEvent, 1), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - }, - NDPDisp: &ndpDisp, - }) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", err) - } - - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithOpts(llAddr1, 0, header.NDPOptionsSerializer{test.opt})) - - if test.expected != nil { - select { - case e := <-ndpDisp.rdnssC: - if e.nicID != 1 { - t.Errorf("got rdnss nicID = %d, want = 1", e.nicID) - } - if diff := cmp.Diff(e.rdnss.addrs, test.expected.addrs); diff != "" { - t.Errorf("rdnss addrs mismatch (-want +got):\n%s", diff) - } - if e.rdnss.lifetime != test.expected.lifetime { - t.Errorf("got rdnss lifetime = %s, want = %s", e.rdnss.lifetime, test.expected.lifetime) - } - default: - t.Fatal("expected an RDNSS option event") - } - } - - // Should have no more RDNSS options. - select { - case e := <-ndpDisp.rdnssC: - t.Fatalf("unexpectedly got a new RDNSS option event: %+v", e) - default: - } - }) - } -} - -// TestNDPDNSSearchListDispatch tests that the integrator is informed when an -// NDP DNS Search List option is received with at least one domain name in the -// search list. -func TestNDPDNSSearchListDispatch(t *testing.T) { - const nicID = 1 - - ndpDisp := ndpDispatcher{ - dnsslC: make(chan ndpDNSSLEvent, 3), - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - }, - NDPDisp: &ndpDisp, - }) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - optSer := header.NDPOptionsSerializer{ - header.NDPDNSSearchList([]byte{ - 0, 0, - 0, 0, 0, 0, - 2, 'h', 'i', - 0, - }), - header.NDPDNSSearchList([]byte{ - 0, 0, - 0, 0, 0, 1, - 1, 'i', - 0, - 2, 'a', 'm', - 2, 'm', 'e', - 0, - }), - header.NDPDNSSearchList([]byte{ - 0, 0, - 0, 0, 1, 0, - 3, 'x', 'y', 'z', - 0, - 5, 'h', 'e', 'l', 'l', 'o', - 5, 'w', 'o', 'r', 'l', 'd', - 0, - 4, 't', 'h', 'i', 's', - 2, 'i', 's', - 1, 'a', - 4, 't', 'e', 's', 't', - 0, - }), - } - expected := []struct { - domainNames []string - lifetime time.Duration - }{ - { - domainNames: []string{ - "hi", - }, - lifetime: 0, - }, - { - domainNames: []string{ - "i", - "am.me", - }, - lifetime: time.Second, - }, - { - domainNames: []string{ - "xyz", - "hello.world", - "this.is.a.test", - }, - lifetime: 256 * time.Second, - }, - } - - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithOpts(llAddr1, 0, optSer)) - - for i, expected := range expected { - select { - case dnssl := <-ndpDisp.dnsslC: - if dnssl.nicID != nicID { - t.Errorf("got %d-th dnssl nicID = %d, want = %d", i, dnssl.nicID, nicID) - } - if diff := cmp.Diff(dnssl.domainNames, expected.domainNames); diff != "" { - t.Errorf("%d-th dnssl domain names mismatch (-want +got):\n%s", i, diff) - } - if dnssl.lifetime != expected.lifetime { - t.Errorf("got %d-th dnssl lifetime = %s, want = %s", i, dnssl.lifetime, expected.lifetime) - } - default: - t.Fatal("expected a DNSSL event") - } - } - - // Should have no more DNSSL options. - select { - case <-ndpDisp.dnsslC: - t.Fatal("unexpectedly got a DNSSL event") - default: - } -} - -// TestCleanupNDPState tests that all discovered routers and prefixes, and -// auto-generated addresses are invalidated when a NIC becomes a router. -func TestCleanupNDPState(t *testing.T) { - const ( - lifetimeSeconds = 5 - maxRouterAndPrefixEvents = 4 - nicID1 = 1 - nicID2 = 2 - ) - - prefix1, subnet1, e1Addr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, subnet2, e1Addr2 := prefixSubnetAddr(1, linkAddr1) - e2Addr1 := addrForSubnet(subnet1, linkAddr2) - e2Addr2 := addrForSubnet(subnet2, linkAddr2) - llAddrWithPrefix1 := tcpip.AddressWithPrefix{ - Address: llAddr1, - PrefixLen: 64, - } - llAddrWithPrefix2 := tcpip.AddressWithPrefix{ - Address: llAddr2, - PrefixLen: 64, - } - - tests := []struct { - name string - cleanupFn func(t *testing.T, s *stack.Stack) - keepAutoGenLinkLocal bool - maxAutoGenAddrEvents int - skipFinalAddrCheck bool - }{ - // A NIC should still keep its auto-generated link-local address when - // becoming a router. - { - name: "Enable forwarding", - cleanupFn: func(t *testing.T, s *stack.Stack) { - t.Helper() - s.SetForwarding(true) - }, - keepAutoGenLinkLocal: true, - maxAutoGenAddrEvents: 4, - }, - - // A NIC should cleanup all NDP state when it is disabled. - { - name: "Disable NIC", - cleanupFn: func(t *testing.T, s *stack.Stack) { - t.Helper() - - if err := s.DisableNIC(nicID1); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID1, err) - } - if err := s.DisableNIC(nicID2); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID2, err) - } - }, - keepAutoGenLinkLocal: false, - maxAutoGenAddrEvents: 6, - }, - - // A NIC should cleanup all NDP state when it is removed. - { - name: "Remove NIC", - cleanupFn: func(t *testing.T, s *stack.Stack) { - t.Helper() - - if err := s.RemoveNIC(nicID1); err != nil { - t.Fatalf("s.RemoveNIC(%d): %s", nicID1, err) - } - if err := s.RemoveNIC(nicID2); err != nil { - t.Fatalf("s.RemoveNIC(%d): %s", nicID2, err) - } - }, - keepAutoGenLinkLocal: false, - maxAutoGenAddrEvents: 6, - // The NICs are removed so we can't check their addresses after calling - // stopFn. - skipFinalAddrCheck: true, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - ndpDisp := ndpDispatcher{ - routerC: make(chan ndpRouterEvent, maxRouterAndPrefixEvents), - rememberRouter: true, - prefixC: make(chan ndpPrefixEvent, maxRouterAndPrefixEvents), - rememberPrefix: true, - autoGenAddrC: make(chan ndpAutoGenAddrEvent, test.maxAutoGenAddrEvents), - } - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - AutoGenIPv6LinkLocal: true, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - DiscoverDefaultRouters: true, - DiscoverOnLinkPrefixes: true, - AutoGenGlobalAddresses: true, - }, - NDPDisp: &ndpDisp, - }) - - expectRouterEvent := func() (bool, ndpRouterEvent) { - select { - case e := <-ndpDisp.routerC: - return true, e - default: - } - - return false, ndpRouterEvent{} - } - - expectPrefixEvent := func() (bool, ndpPrefixEvent) { - select { - case e := <-ndpDisp.prefixC: - return true, e - default: - } - - return false, ndpPrefixEvent{} - } - - expectAutoGenAddrEvent := func() (bool, ndpAutoGenAddrEvent) { - select { - case e := <-ndpDisp.autoGenAddrC: - return true, e - default: - } - - return false, ndpAutoGenAddrEvent{} - } - - e1 := channel.New(0, 1280, linkAddr1) - if err := s.CreateNIC(nicID1, e1); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID1, err) - } - // We have other tests that make sure we receive the *correct* events - // on normal discovery of routers/prefixes, and auto-generated - // addresses. Here we just make sure we get an event and let other tests - // handle the correctness check. - expectAutoGenAddrEvent() - - e2 := channel.New(0, 1280, linkAddr2) - if err := s.CreateNIC(nicID2, e2); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID2, err) - } - expectAutoGenAddrEvent() - - // Receive RAs on NIC(1) and NIC(2) from default routers (llAddr3 and - // llAddr4) w/ PI (for prefix1 in RA from llAddr3 and prefix2 in RA from - // llAddr4) to discover multiple routers and prefixes, and auto-gen - // multiple addresses. - - e1.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, lifetimeSeconds, prefix1, true, true, lifetimeSeconds, lifetimeSeconds)) - if ok, _ := expectRouterEvent(); !ok { - t.Errorf("expected router event for %s on NIC(%d)", llAddr3, nicID1) - } - if ok, _ := expectPrefixEvent(); !ok { - t.Errorf("expected prefix event for %s on NIC(%d)", prefix1, nicID1) - } - if ok, _ := expectAutoGenAddrEvent(); !ok { - t.Errorf("expected auto-gen addr event for %s on NIC(%d)", e1Addr1, nicID1) - } - - e1.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr4, lifetimeSeconds, prefix2, true, true, lifetimeSeconds, lifetimeSeconds)) - if ok, _ := expectRouterEvent(); !ok { - t.Errorf("expected router event for %s on NIC(%d)", llAddr4, nicID1) - } - if ok, _ := expectPrefixEvent(); !ok { - t.Errorf("expected prefix event for %s on NIC(%d)", prefix2, nicID1) - } - if ok, _ := expectAutoGenAddrEvent(); !ok { - t.Errorf("expected auto-gen addr event for %s on NIC(%d)", e1Addr2, nicID1) - } - - e2.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, lifetimeSeconds, prefix1, true, true, lifetimeSeconds, lifetimeSeconds)) - if ok, _ := expectRouterEvent(); !ok { - t.Errorf("expected router event for %s on NIC(%d)", llAddr3, nicID2) - } - if ok, _ := expectPrefixEvent(); !ok { - t.Errorf("expected prefix event for %s on NIC(%d)", prefix1, nicID2) - } - if ok, _ := expectAutoGenAddrEvent(); !ok { - t.Errorf("expected auto-gen addr event for %s on NIC(%d)", e1Addr2, nicID2) - } - - e2.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr4, lifetimeSeconds, prefix2, true, true, lifetimeSeconds, lifetimeSeconds)) - if ok, _ := expectRouterEvent(); !ok { - t.Errorf("expected router event for %s on NIC(%d)", llAddr4, nicID2) - } - if ok, _ := expectPrefixEvent(); !ok { - t.Errorf("expected prefix event for %s on NIC(%d)", prefix2, nicID2) - } - if ok, _ := expectAutoGenAddrEvent(); !ok { - t.Errorf("expected auto-gen addr event for %s on NIC(%d)", e2Addr2, nicID2) - } - - // We should have the auto-generated addresses added. - nicinfo := s.NICInfo() - nic1Addrs := nicinfo[nicID1].ProtocolAddresses - nic2Addrs := nicinfo[nicID2].ProtocolAddresses - if !containsV6Addr(nic1Addrs, llAddrWithPrefix1) { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", llAddrWithPrefix1, nicID1, nic1Addrs) - } - if !containsV6Addr(nic1Addrs, e1Addr1) { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", e1Addr1, nicID1, nic1Addrs) - } - if !containsV6Addr(nic1Addrs, e1Addr2) { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", e1Addr2, nicID1, nic1Addrs) - } - if !containsV6Addr(nic2Addrs, llAddrWithPrefix2) { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", llAddrWithPrefix2, nicID2, nic2Addrs) - } - if !containsV6Addr(nic2Addrs, e2Addr1) { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", e2Addr1, nicID2, nic2Addrs) - } - if !containsV6Addr(nic2Addrs, e2Addr2) { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", e2Addr2, nicID2, nic2Addrs) - } - - // We can't proceed any further if we already failed the test (missing - // some discovery/auto-generated address events or addresses). - if t.Failed() { - t.FailNow() - } - - test.cleanupFn(t, s) - - // Collect invalidation events after having NDP state cleaned up. - gotRouterEvents := make(map[ndpRouterEvent]int) - for i := 0; i < maxRouterAndPrefixEvents; i++ { - ok, e := expectRouterEvent() - if !ok { - t.Errorf("expected %d router events after becoming a router; got = %d", maxRouterAndPrefixEvents, i) - break - } - gotRouterEvents[e]++ - } - gotPrefixEvents := make(map[ndpPrefixEvent]int) - for i := 0; i < maxRouterAndPrefixEvents; i++ { - ok, e := expectPrefixEvent() - if !ok { - t.Errorf("expected %d prefix events after becoming a router; got = %d", maxRouterAndPrefixEvents, i) - break - } - gotPrefixEvents[e]++ - } - gotAutoGenAddrEvents := make(map[ndpAutoGenAddrEvent]int) - for i := 0; i < test.maxAutoGenAddrEvents; i++ { - ok, e := expectAutoGenAddrEvent() - if !ok { - t.Errorf("expected %d auto-generated address events after becoming a router; got = %d", test.maxAutoGenAddrEvents, i) - break - } - gotAutoGenAddrEvents[e]++ - } - - // No need to proceed any further if we already failed the test (missing - // some invalidation events). - if t.Failed() { - t.FailNow() - } - - expectedRouterEvents := map[ndpRouterEvent]int{ - {nicID: nicID1, addr: llAddr3, discovered: false}: 1, - {nicID: nicID1, addr: llAddr4, discovered: false}: 1, - {nicID: nicID2, addr: llAddr3, discovered: false}: 1, - {nicID: nicID2, addr: llAddr4, discovered: false}: 1, - } - if diff := cmp.Diff(expectedRouterEvents, gotRouterEvents); diff != "" { - t.Errorf("router events mismatch (-want +got):\n%s", diff) - } - expectedPrefixEvents := map[ndpPrefixEvent]int{ - {nicID: nicID1, prefix: subnet1, discovered: false}: 1, - {nicID: nicID1, prefix: subnet2, discovered: false}: 1, - {nicID: nicID2, prefix: subnet1, discovered: false}: 1, - {nicID: nicID2, prefix: subnet2, discovered: false}: 1, - } - if diff := cmp.Diff(expectedPrefixEvents, gotPrefixEvents); diff != "" { - t.Errorf("prefix events mismatch (-want +got):\n%s", diff) - } - expectedAutoGenAddrEvents := map[ndpAutoGenAddrEvent]int{ - {nicID: nicID1, addr: e1Addr1, eventType: invalidatedAddr}: 1, - {nicID: nicID1, addr: e1Addr2, eventType: invalidatedAddr}: 1, - {nicID: nicID2, addr: e2Addr1, eventType: invalidatedAddr}: 1, - {nicID: nicID2, addr: e2Addr2, eventType: invalidatedAddr}: 1, - } - - if !test.keepAutoGenLinkLocal { - expectedAutoGenAddrEvents[ndpAutoGenAddrEvent{nicID: nicID1, addr: llAddrWithPrefix1, eventType: invalidatedAddr}] = 1 - expectedAutoGenAddrEvents[ndpAutoGenAddrEvent{nicID: nicID2, addr: llAddrWithPrefix2, eventType: invalidatedAddr}] = 1 - } - - if diff := cmp.Diff(expectedAutoGenAddrEvents, gotAutoGenAddrEvents); diff != "" { - t.Errorf("auto-generated address events mismatch (-want +got):\n%s", diff) - } - - if !test.skipFinalAddrCheck { - // Make sure the auto-generated addresses got removed. - nicinfo = s.NICInfo() - nic1Addrs = nicinfo[nicID1].ProtocolAddresses - nic2Addrs = nicinfo[nicID2].ProtocolAddresses - if containsV6Addr(nic1Addrs, llAddrWithPrefix1) != test.keepAutoGenLinkLocal { - if test.keepAutoGenLinkLocal { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", llAddrWithPrefix1, nicID1, nic1Addrs) - } else { - t.Errorf("still have %s in the list of addresses for NIC(%d): %+v", llAddrWithPrefix1, nicID1, nic1Addrs) - } - } - if containsV6Addr(nic1Addrs, e1Addr1) { - t.Errorf("still have %s in the list of addresses for NIC(%d): %+v", e1Addr1, nicID1, nic1Addrs) - } - if containsV6Addr(nic1Addrs, e1Addr2) { - t.Errorf("still have %s in the list of addresses for NIC(%d): %+v", e1Addr2, nicID1, nic1Addrs) - } - if containsV6Addr(nic2Addrs, llAddrWithPrefix2) != test.keepAutoGenLinkLocal { - if test.keepAutoGenLinkLocal { - t.Errorf("missing %s from the list of addresses for NIC(%d): %+v", llAddrWithPrefix2, nicID2, nic2Addrs) - } else { - t.Errorf("still have %s in the list of addresses for NIC(%d): %+v", llAddrWithPrefix2, nicID2, nic2Addrs) - } - } - if containsV6Addr(nic2Addrs, e2Addr1) { - t.Errorf("still have %s in the list of addresses for NIC(%d): %+v", e2Addr1, nicID2, nic2Addrs) - } - if containsV6Addr(nic2Addrs, e2Addr2) { - t.Errorf("still have %s in the list of addresses for NIC(%d): %+v", e2Addr2, nicID2, nic2Addrs) - } - } - - // Should not get any more events (invalidation timers should have been - // cancelled when the NDP state was cleaned up). - time.Sleep(lifetimeSeconds*time.Second + defaultTimeout) - select { - case <-ndpDisp.routerC: - t.Error("unexpected router event") - default: - } - select { - case <-ndpDisp.prefixC: - t.Error("unexpected prefix event") - default: - } - select { - case <-ndpDisp.autoGenAddrC: - t.Error("unexpected auto-generated address event") - default: - } - }) - } -} - -// TestDHCPv6ConfigurationFromNDPDA tests that the NDPDispatcher is properly -// informed when new information about what configurations are available via -// DHCPv6 is learned. -func TestDHCPv6ConfigurationFromNDPDA(t *testing.T) { - const nicID = 1 - - ndpDisp := ndpDispatcher{ - dhcpv6ConfigurationC: make(chan ndpDHCPv6Event, 1), - rememberRouter: true, - } - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - }, - NDPDisp: &ndpDisp, - }) - - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - expectDHCPv6Event := func(configuration stack.DHCPv6ConfigurationFromNDPRA) { - t.Helper() - select { - case e := <-ndpDisp.dhcpv6ConfigurationC: - if diff := cmp.Diff(ndpDHCPv6Event{nicID: nicID, configuration: configuration}, e, cmp.AllowUnexported(e)); diff != "" { - t.Errorf("dhcpv6 event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected DHCPv6 configuration event") - } - } - - expectNoDHCPv6Event := func() { - t.Helper() - select { - case <-ndpDisp.dhcpv6ConfigurationC: - t.Fatal("unexpected DHCPv6 configuration event") - default: - } - } - - // Even if the first RA reports no DHCPv6 configurations are available, the - // dispatcher should get an event. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) - expectDHCPv6Event(stack.DHCPv6NoConfiguration) - // Receiving the same update again should not result in an event to the - // dispatcher. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) - expectNoDHCPv6Event() - - // Receive an RA that updates the DHCPv6 configuration to Other - // Configurations. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectDHCPv6Event(stack.DHCPv6OtherConfigurations) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectNoDHCPv6Event() - - // Receive an RA that updates the DHCPv6 configuration to Managed Address. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, false)) - expectDHCPv6Event(stack.DHCPv6ManagedAddress) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, false)) - expectNoDHCPv6Event() - - // Receive an RA that updates the DHCPv6 configuration to none. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) - expectDHCPv6Event(stack.DHCPv6NoConfiguration) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, false)) - expectNoDHCPv6Event() - - // Receive an RA that updates the DHCPv6 configuration to Managed Address. - // - // Note, when the M flag is set, the O flag is redundant. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, true)) - expectDHCPv6Event(stack.DHCPv6ManagedAddress) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, true)) - expectNoDHCPv6Event() - // Even though the DHCPv6 flags are different, the effective configuration is - // the same so we should not receive a new event. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, false)) - expectNoDHCPv6Event() - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, true, true)) - expectNoDHCPv6Event() - - // Receive an RA that updates the DHCPv6 configuration to Other - // Configurations. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectDHCPv6Event(stack.DHCPv6OtherConfigurations) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectNoDHCPv6Event() - - // Cycling the NIC should cause the last DHCPv6 configuration to be cleared. - if err := s.DisableNIC(nicID); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID, err) - } - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - - // Receive an RA that updates the DHCPv6 configuration to Other - // Configurations. - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectDHCPv6Event(stack.DHCPv6OtherConfigurations) - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithDHCPv6(llAddr2, false, true)) - expectNoDHCPv6Event() -} - -// TestRouterSolicitation tests the initial Router Solicitations that are sent -// when a NIC newly becomes enabled. -func TestRouterSolicitation(t *testing.T) { - const nicID = 1 - - tests := []struct { - name string - linkHeaderLen uint16 - linkAddr tcpip.LinkAddress - nicAddr tcpip.Address - expectedSrcAddr tcpip.Address - expectedNDPOpts []header.NDPOption - maxRtrSolicit uint8 - rtrSolicitInt time.Duration - effectiveRtrSolicitInt time.Duration - maxRtrSolicitDelay time.Duration - effectiveMaxRtrSolicitDelay time.Duration - }{ - { - name: "Single RS with 2s delay and interval", - expectedSrcAddr: header.IPv6Any, - maxRtrSolicit: 1, - rtrSolicitInt: 2 * time.Second, - effectiveRtrSolicitInt: 2 * time.Second, - maxRtrSolicitDelay: 2 * time.Second, - effectiveMaxRtrSolicitDelay: 2 * time.Second, - }, - { - name: "Single RS with 4s delay and interval", - expectedSrcAddr: header.IPv6Any, - maxRtrSolicit: 1, - rtrSolicitInt: 4 * time.Second, - effectiveRtrSolicitInt: 4 * time.Second, - maxRtrSolicitDelay: 4 * time.Second, - effectiveMaxRtrSolicitDelay: 4 * time.Second, - }, - { - name: "Two RS with delay", - linkHeaderLen: 1, - nicAddr: llAddr1, - expectedSrcAddr: llAddr1, - maxRtrSolicit: 2, - rtrSolicitInt: 2 * time.Second, - effectiveRtrSolicitInt: 2 * time.Second, - maxRtrSolicitDelay: 500 * time.Millisecond, - effectiveMaxRtrSolicitDelay: 500 * time.Millisecond, - }, - { - name: "Single RS without delay", - linkHeaderLen: 2, - linkAddr: linkAddr1, - nicAddr: llAddr1, - expectedSrcAddr: llAddr1, - expectedNDPOpts: []header.NDPOption{ - header.NDPSourceLinkLayerAddressOption(linkAddr1), - }, - maxRtrSolicit: 1, - rtrSolicitInt: 2 * time.Second, - effectiveRtrSolicitInt: 2 * time.Second, - maxRtrSolicitDelay: 0, - effectiveMaxRtrSolicitDelay: 0, - }, - { - name: "Two RS without delay and invalid zero interval", - linkHeaderLen: 3, - linkAddr: linkAddr1, - expectedSrcAddr: header.IPv6Any, - maxRtrSolicit: 2, - rtrSolicitInt: 0, - effectiveRtrSolicitInt: 4 * time.Second, - maxRtrSolicitDelay: 0, - effectiveMaxRtrSolicitDelay: 0, - }, - { - name: "Three RS without delay", - linkAddr: linkAddr1, - expectedSrcAddr: header.IPv6Any, - maxRtrSolicit: 3, - rtrSolicitInt: 500 * time.Millisecond, - effectiveRtrSolicitInt: 500 * time.Millisecond, - maxRtrSolicitDelay: 0, - effectiveMaxRtrSolicitDelay: 0, - }, - { - name: "Two RS with invalid negative delay", - linkAddr: linkAddr1, - expectedSrcAddr: header.IPv6Any, - maxRtrSolicit: 2, - rtrSolicitInt: time.Second, - effectiveRtrSolicitInt: time.Second, - maxRtrSolicitDelay: -3 * time.Second, - effectiveMaxRtrSolicitDelay: time.Second, - }, - } - - // This Run will not return until the parallel tests finish. - // - // We need this because we need to do some teardown work after the - // parallel tests complete. - // - // See https://godoc.org/testing#hdr-Subtests_and_Sub_benchmarks for - // more details. - t.Run("group", func(t *testing.T) { - for _, test := range tests { - test := test - - t.Run(test.name, func(t *testing.T) { - t.Parallel() - - e := channelLinkWithHeaderLength{ - Endpoint: channel.New(int(test.maxRtrSolicit), 1280, test.linkAddr), - headerLength: test.linkHeaderLen, - } - e.Endpoint.LinkEPCapabilities |= stack.CapabilityResolutionRequired - waitForPkt := func(timeout time.Duration) { - t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), timeout) - defer cancel() - p, ok := e.ReadContext(ctx) - if !ok { - t.Fatal("timed out waiting for packet") - return - } - - if p.Proto != header.IPv6ProtocolNumber { - t.Fatalf("got Proto = %d, want = %d", p.Proto, header.IPv6ProtocolNumber) - } - - // Make sure the right remote link address is used. - if want := header.EthernetAddressFromMulticastIPv6Address(header.IPv6AllRoutersMulticastAddress); p.Route.RemoteLinkAddress != want { - t.Errorf("got remote link address = %s, want = %s", p.Route.RemoteLinkAddress, want) - } - - checker.IPv6(t, - p.Pkt.Header.View(), - checker.SrcAddr(test.expectedSrcAddr), - checker.DstAddr(header.IPv6AllRoutersMulticastAddress), - checker.TTL(header.NDPHopLimit), - checker.NDPRS(checker.NDPRSOptions(test.expectedNDPOpts)), - ) - - if l, want := p.Pkt.Header.AvailableLength(), int(test.linkHeaderLen); l != want { - t.Errorf("got p.Pkt.Header.AvailableLength() = %d; want = %d", l, want) - } - } - waitForNothing := func(timeout time.Duration) { - t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), timeout) - defer cancel() - if _, ok := e.ReadContext(ctx); ok { - t.Fatal("unexpectedly got a packet") - } - } - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - MaxRtrSolicitations: test.maxRtrSolicit, - RtrSolicitationInterval: test.rtrSolicitInt, - MaxRtrSolicitationDelay: test.maxRtrSolicitDelay, - }, - }) - if err := s.CreateNIC(nicID, &e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - if addr := test.nicAddr; addr != "" { - if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr); err != nil { - t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr, err) - } - } - - // Make sure each RS is sent at the right time. - remaining := test.maxRtrSolicit - if remaining > 0 { - waitForPkt(test.effectiveMaxRtrSolicitDelay + defaultAsyncEventTimeout) - remaining-- - } - - for ; remaining > 0; remaining-- { - if test.effectiveRtrSolicitInt > defaultAsyncEventTimeout { - waitForNothing(test.effectiveRtrSolicitInt - defaultAsyncEventTimeout) - waitForPkt(2 * defaultAsyncEventTimeout) - } else { - waitForPkt(test.effectiveRtrSolicitInt * defaultAsyncEventTimeout) - } - } - - // Make sure no more RS. - if test.effectiveRtrSolicitInt > test.effectiveMaxRtrSolicitDelay { - waitForNothing(test.effectiveRtrSolicitInt + defaultAsyncEventTimeout) - } else { - waitForNothing(test.effectiveMaxRtrSolicitDelay + defaultAsyncEventTimeout) - } - - // Make sure the counter got properly - // incremented. - if got, want := s.Stats().ICMP.V6PacketsSent.RouterSolicit.Value(), uint64(test.maxRtrSolicit); got != want { - t.Fatalf("got sent RouterSolicit = %d, want = %d", got, want) - } - }) - } - }) -} - -func TestStopStartSolicitingRouters(t *testing.T) { - const nicID = 1 - const delay = 0 - const interval = 500 * time.Millisecond - const maxRtrSolicitations = 3 - - tests := []struct { - name string - startFn func(t *testing.T, s *stack.Stack) - // first is used to tell stopFn that it is being called for the first time - // after router solicitations were last enabled. - stopFn func(t *testing.T, s *stack.Stack, first bool) - }{ - // Tests that when forwarding is enabled or disabled, router solicitations - // are stopped or started, respectively. - { - name: "Enable and disable forwarding", - startFn: func(t *testing.T, s *stack.Stack) { - t.Helper() - s.SetForwarding(false) - }, - stopFn: func(t *testing.T, s *stack.Stack, _ bool) { - t.Helper() - s.SetForwarding(true) - }, - }, - - // Tests that when a NIC is enabled or disabled, router solicitations - // are started or stopped, respectively. - { - name: "Enable and disable NIC", - startFn: func(t *testing.T, s *stack.Stack) { - t.Helper() - - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - }, - stopFn: func(t *testing.T, s *stack.Stack, _ bool) { - t.Helper() - - if err := s.DisableNIC(nicID); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID, err) - } - }, - }, - - // Tests that when a NIC is removed, router solicitations are stopped. We - // cannot start router solications on a removed NIC. - { - name: "Remove NIC", - stopFn: func(t *testing.T, s *stack.Stack, first bool) { - t.Helper() - - // Only try to remove the NIC the first time stopFn is called since it's - // impossible to remove an already removed NIC. - if !first { - return - } - - if err := s.RemoveNIC(nicID); err != nil { - t.Fatalf("s.RemoveNIC(%d): %s", nicID, err) - } - }, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - e := channel.New(maxRtrSolicitations, 1280, linkAddr1) - waitForPkt := func(timeout time.Duration) { - t.Helper() - - ctx, cancel := context.WithTimeout(context.Background(), timeout) - defer cancel() - p, ok := e.ReadContext(ctx) - if !ok { - t.Fatal("timed out waiting for packet") - } - - if p.Proto != header.IPv6ProtocolNumber { - t.Fatalf("got Proto = %d, want = %d", p.Proto, header.IPv6ProtocolNumber) - } - checker.IPv6(t, p.Pkt.Header.View(), - checker.SrcAddr(header.IPv6Any), - checker.DstAddr(header.IPv6AllRoutersMulticastAddress), - checker.TTL(header.NDPHopLimit), - checker.NDPRS()) - } - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - MaxRtrSolicitations: maxRtrSolicitations, - RtrSolicitationInterval: interval, - MaxRtrSolicitationDelay: delay, - }, - }) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - // Stop soliciting routers. - test.stopFn(t, s, true /* first */) - ctx, cancel := context.WithTimeout(context.Background(), delay+defaultAsyncEventTimeout) - defer cancel() - if _, ok := e.ReadContext(ctx); ok { - // A single RS may have been sent before solicitations were stopped. - ctx, cancel := context.WithTimeout(context.Background(), interval+defaultAsyncEventTimeout) - defer cancel() - if _, ok = e.ReadContext(ctx); ok { - t.Fatal("should not have sent more than one RS message") - } - } - - // Stopping router solicitations after it has already been stopped should - // do nothing. - test.stopFn(t, s, false /* first */) - ctx, cancel = context.WithTimeout(context.Background(), delay+defaultAsyncEventTimeout) - defer cancel() - if _, ok := e.ReadContext(ctx); ok { - t.Fatal("unexpectedly got a packet after router solicitation has been stopepd") - } - - // If test.startFn is nil, there is no way to restart router solications. - if test.startFn == nil { - return - } - - // Start soliciting routers. - test.startFn(t, s) - waitForPkt(delay + defaultAsyncEventTimeout) - waitForPkt(interval + defaultAsyncEventTimeout) - waitForPkt(interval + defaultAsyncEventTimeout) - ctx, cancel = context.WithTimeout(context.Background(), interval+defaultAsyncEventTimeout) - defer cancel() - if _, ok := e.ReadContext(ctx); ok { - t.Fatal("unexpectedly got an extra packet after sending out the expected RSs") - } - - // Starting router solicitations after it has already completed should do - // nothing. - test.startFn(t, s) - ctx, cancel = context.WithTimeout(context.Background(), delay+defaultAsyncEventTimeout) - defer cancel() - if _, ok := e.ReadContext(ctx); ok { - t.Fatal("unexpectedly got a packet after finishing router solicitations") - } - }) - } -} diff --git a/pkg/tcpip/stack/nic_test.go b/pkg/tcpip/stack/nic_test.go deleted file mode 100644 index 31f865260..000000000 --- a/pkg/tcpip/stack/nic_test.go +++ /dev/null @@ -1,318 +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 ( - "math" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/header" -) - -var _ LinkEndpoint = (*testLinkEndpoint)(nil) - -// A LinkEndpoint that throws away outgoing packets. -// -// We use this instead of the channel endpoint as the channel package depends on -// the stack package which this test lives in, causing a cyclic dependency. -type testLinkEndpoint struct { - dispatcher NetworkDispatcher -} - -// Attach implements LinkEndpoint.Attach. -func (e *testLinkEndpoint) Attach(dispatcher NetworkDispatcher) { - e.dispatcher = dispatcher -} - -// IsAttached implements LinkEndpoint.IsAttached. -func (e *testLinkEndpoint) IsAttached() bool { - return e.dispatcher != nil -} - -// MTU implements LinkEndpoint.MTU. -func (*testLinkEndpoint) MTU() uint32 { - return math.MaxUint16 -} - -// Capabilities implements LinkEndpoint.Capabilities. -func (*testLinkEndpoint) Capabilities() LinkEndpointCapabilities { - return CapabilityResolutionRequired -} - -// MaxHeaderLength implements LinkEndpoint.MaxHeaderLength. -func (*testLinkEndpoint) MaxHeaderLength() uint16 { - return 0 -} - -// LinkAddress returns the link address of this endpoint. -func (*testLinkEndpoint) LinkAddress() tcpip.LinkAddress { - return "" -} - -// Wait implements LinkEndpoint.Wait. -func (*testLinkEndpoint) Wait() {} - -// WritePacket implements LinkEndpoint.WritePacket. -func (e *testLinkEndpoint) WritePacket(*Route, *GSO, tcpip.NetworkProtocolNumber, *PacketBuffer) *tcpip.Error { - return nil -} - -// WritePackets implements LinkEndpoint.WritePackets. -func (e *testLinkEndpoint) WritePackets(*Route, *GSO, PacketBufferList, tcpip.NetworkProtocolNumber) (int, *tcpip.Error) { - // Our tests don't use this so we don't support it. - return 0, tcpip.ErrNotSupported -} - -// WriteRawPacket implements LinkEndpoint.WriteRawPacket. -func (e *testLinkEndpoint) WriteRawPacket(buffer.VectorisedView) *tcpip.Error { - // Our tests don't use this so we don't support it. - return tcpip.ErrNotSupported -} - -var _ NetworkEndpoint = (*testIPv6Endpoint)(nil) - -// An IPv6 NetworkEndpoint that throws away outgoing packets. -// -// We use this instead of ipv6.endpoint because the ipv6 package depends on -// the stack package which this test lives in, causing a cyclic dependency. -type testIPv6Endpoint struct { - nicID tcpip.NICID - id NetworkEndpointID - prefixLen int - linkEP LinkEndpoint - protocol *testIPv6Protocol -} - -// DefaultTTL implements NetworkEndpoint.DefaultTTL. -func (*testIPv6Endpoint) DefaultTTL() uint8 { - return 0 -} - -// MTU implements NetworkEndpoint.MTU. -func (e *testIPv6Endpoint) MTU() uint32 { - return e.linkEP.MTU() - header.IPv6MinimumSize -} - -// Capabilities implements NetworkEndpoint.Capabilities. -func (e *testIPv6Endpoint) Capabilities() LinkEndpointCapabilities { - return e.linkEP.Capabilities() -} - -// MaxHeaderLength implements NetworkEndpoint.MaxHeaderLength. -func (e *testIPv6Endpoint) MaxHeaderLength() uint16 { - return e.linkEP.MaxHeaderLength() + header.IPv6MinimumSize -} - -// WritePacket implements NetworkEndpoint.WritePacket. -func (*testIPv6Endpoint) WritePacket(*Route, *GSO, NetworkHeaderParams, *PacketBuffer) *tcpip.Error { - return nil -} - -// WritePackets implements NetworkEndpoint.WritePackets. -func (*testIPv6Endpoint) WritePackets(*Route, *GSO, PacketBufferList, NetworkHeaderParams) (int, *tcpip.Error) { - // Our tests don't use this so we don't support it. - return 0, tcpip.ErrNotSupported -} - -// WriteHeaderIncludedPacket implements -// NetworkEndpoint.WriteHeaderIncludedPacket. -func (*testIPv6Endpoint) WriteHeaderIncludedPacket(*Route, *PacketBuffer) *tcpip.Error { - // Our tests don't use this so we don't support it. - return tcpip.ErrNotSupported -} - -// ID implements NetworkEndpoint.ID. -func (e *testIPv6Endpoint) ID() *NetworkEndpointID { - return &e.id -} - -// PrefixLen implements NetworkEndpoint.PrefixLen. -func (e *testIPv6Endpoint) PrefixLen() int { - return e.prefixLen -} - -// NICID implements NetworkEndpoint.NICID. -func (e *testIPv6Endpoint) NICID() tcpip.NICID { - return e.nicID -} - -// HandlePacket implements NetworkEndpoint.HandlePacket. -func (*testIPv6Endpoint) HandlePacket(*Route, *PacketBuffer) { -} - -// Close implements NetworkEndpoint.Close. -func (*testIPv6Endpoint) Close() {} - -// NetworkProtocolNumber implements NetworkEndpoint.NetworkProtocolNumber. -func (*testIPv6Endpoint) NetworkProtocolNumber() tcpip.NetworkProtocolNumber { - return header.IPv6ProtocolNumber -} - -var _ NetworkProtocol = (*testIPv6Protocol)(nil) - -// An IPv6 NetworkProtocol that supports the bare minimum to make a stack -// believe it supports IPv6. -// -// We use this instead of ipv6.protocol because the ipv6 package depends on -// the stack package which this test lives in, causing a cyclic dependency. -type testIPv6Protocol struct{} - -// Number implements NetworkProtocol.Number. -func (*testIPv6Protocol) Number() tcpip.NetworkProtocolNumber { - return header.IPv6ProtocolNumber -} - -// MinimumPacketSize implements NetworkProtocol.MinimumPacketSize. -func (*testIPv6Protocol) MinimumPacketSize() int { - return header.IPv6MinimumSize -} - -// DefaultPrefixLen implements NetworkProtocol.DefaultPrefixLen. -func (*testIPv6Protocol) DefaultPrefixLen() int { - return header.IPv6AddressSize * 8 -} - -// ParseAddresses implements NetworkProtocol.ParseAddresses. -func (*testIPv6Protocol) ParseAddresses(v buffer.View) (src, dst tcpip.Address) { - h := header.IPv6(v) - return h.SourceAddress(), h.DestinationAddress() -} - -// NewEndpoint implements NetworkProtocol.NewEndpoint. -func (p *testIPv6Protocol) NewEndpoint(nicID tcpip.NICID, addrWithPrefix tcpip.AddressWithPrefix, _ LinkAddressCache, _ TransportDispatcher, linkEP LinkEndpoint, _ *Stack) (NetworkEndpoint, *tcpip.Error) { - return &testIPv6Endpoint{ - nicID: nicID, - id: NetworkEndpointID{LocalAddress: addrWithPrefix.Address}, - prefixLen: addrWithPrefix.PrefixLen, - linkEP: linkEP, - protocol: p, - }, nil -} - -// SetOption implements NetworkProtocol.SetOption. -func (*testIPv6Protocol) SetOption(interface{}) *tcpip.Error { - return nil -} - -// Option implements NetworkProtocol.Option. -func (*testIPv6Protocol) Option(interface{}) *tcpip.Error { - return nil -} - -// Close implements NetworkProtocol.Close. -func (*testIPv6Protocol) Close() {} - -// Wait implements NetworkProtocol.Wait. -func (*testIPv6Protocol) Wait() {} - -// Parse implements NetworkProtocol.Parse. -func (*testIPv6Protocol) Parse(*PacketBuffer) (tcpip.TransportProtocolNumber, bool, bool) { - return 0, false, false -} - -var _ LinkAddressResolver = (*testIPv6Protocol)(nil) - -// LinkAddressProtocol implements LinkAddressResolver. -func (*testIPv6Protocol) LinkAddressProtocol() tcpip.NetworkProtocolNumber { - return header.IPv6ProtocolNumber -} - -// LinkAddressRequest implements LinkAddressResolver. -func (*testIPv6Protocol) LinkAddressRequest(_, _ tcpip.Address, _ LinkEndpoint) *tcpip.Error { - return nil -} - -// ResolveStaticAddress implements LinkAddressResolver. -func (*testIPv6Protocol) ResolveStaticAddress(addr tcpip.Address) (tcpip.LinkAddress, bool) { - if header.IsV6MulticastAddress(addr) { - return header.EthernetAddressFromMulticastIPv6Address(addr), true - } - return "", false -} - -// Test the race condition where a NIC is removed and an RS timer fires at the -// same time. -func TestRemoveNICWhileHandlingRSTimer(t *testing.T) { - const ( - nicID = 1 - - maxRtrSolicitations = 5 - ) - - e := testLinkEndpoint{} - s := New(Options{ - NetworkProtocols: []NetworkProtocol{&testIPv6Protocol{}}, - NDPConfigs: NDPConfigurations{ - MaxRtrSolicitations: maxRtrSolicitations, - RtrSolicitationInterval: minimumRtrSolicitationInterval, - }, - }) - - if err := s.CreateNIC(nicID, &e); err != nil { - t.Fatalf("s.CreateNIC(%d, _) = %s", nicID, err) - } - - s.mu.Lock() - // Wait for the router solicitation timer to fire and block trying to obtain - // the stack lock when doing link address resolution. - time.Sleep(minimumRtrSolicitationInterval * 2) - if err := s.removeNICLocked(nicID); err != nil { - t.Fatalf("s.removeNICLocked(%d) = %s", nicID, err) - } - s.mu.Unlock() -} - -func TestDisabledRxStatsWhenNICDisabled(t *testing.T) { - // When the NIC is disabled, the only field that matters is the stats field. - // This test is limited to stats counter checks. - nic := NIC{ - stats: makeNICStats(), - } - - if got := nic.stats.DisabledRx.Packets.Value(); got != 0 { - t.Errorf("got DisabledRx.Packets = %d, want = 0", got) - } - if got := nic.stats.DisabledRx.Bytes.Value(); got != 0 { - t.Errorf("got DisabledRx.Bytes = %d, want = 0", got) - } - if got := nic.stats.Rx.Packets.Value(); got != 0 { - t.Errorf("got Rx.Packets = %d, want = 0", got) - } - if got := nic.stats.Rx.Bytes.Value(); got != 0 { - t.Errorf("got Rx.Bytes = %d, want = 0", got) - } - - if t.Failed() { - t.FailNow() - } - - nic.DeliverNetworkPacket("", "", 0, &PacketBuffer{Data: buffer.View([]byte{1, 2, 3, 4}).ToVectorisedView()}) - - if got := nic.stats.DisabledRx.Packets.Value(); got != 1 { - t.Errorf("got DisabledRx.Packets = %d, want = 1", got) - } - if got := nic.stats.DisabledRx.Bytes.Value(); got != 4 { - t.Errorf("got DisabledRx.Bytes = %d, want = 4", got) - } - if got := nic.stats.Rx.Packets.Value(); got != 0 { - t.Errorf("got Rx.Packets = %d, want = 0", got) - } - if got := nic.stats.Rx.Bytes.Value(); got != 0 { - t.Errorf("got Rx.Bytes = %d, want = 0", got) - } -} diff --git a/pkg/tcpip/stack/packet_buffer_list.go b/pkg/tcpip/stack/packet_buffer_list.go new file mode 100644 index 000000000..460c74c5a --- /dev/null +++ b/pkg/tcpip/stack/packet_buffer_list.go @@ -0,0 +1,193 @@ +package stack + +// ElementMapper provides an identity mapping by default. +// +// This can be replaced to provide a struct that maps elements to linker +// objects, if they are not the same. An ElementMapper is not typically +// required if: Linker is left as is, Element is left as is, or Linker and +// Element are the same type. +type PacketBufferElementMapper struct{} + +// linkerFor maps an Element to a Linker. +// +// This default implementation should be inlined. +// +//go:nosplit +func (PacketBufferElementMapper) linkerFor(elem *PacketBuffer) *PacketBuffer { return elem } + +// List is an intrusive list. Entries can be added to or removed from the list +// in O(1) time and with no additional memory allocations. +// +// The zero value for List is an empty list ready to use. +// +// To iterate over a list (where l is a List): +// for e := l.Front(); e != nil; e = e.Next() { +// // do something with e. +// } +// +// +stateify savable +type PacketBufferList struct { + head *PacketBuffer + tail *PacketBuffer +} + +// Reset resets list l to the empty state. +func (l *PacketBufferList) Reset() { + l.head = nil + l.tail = nil +} + +// Empty returns true iff the list is empty. +func (l *PacketBufferList) Empty() bool { + return l.head == nil +} + +// Front returns the first element of list l or nil. +func (l *PacketBufferList) Front() *PacketBuffer { + return l.head +} + +// Back returns the last element of list l or nil. +func (l *PacketBufferList) Back() *PacketBuffer { + return l.tail +} + +// Len returns the number of elements in the list. +// +// NOTE: This is an O(n) operation. +func (l *PacketBufferList) Len() (count int) { + for e := l.Front(); e != nil; e = e.Next() { + count++ + } + return count +} + +// PushFront inserts the element e at the front of list l. +func (l *PacketBufferList) PushFront(e *PacketBuffer) { + linker := PacketBufferElementMapper{}.linkerFor(e) + linker.SetNext(l.head) + linker.SetPrev(nil) + if l.head != nil { + PacketBufferElementMapper{}.linkerFor(l.head).SetPrev(e) + } else { + l.tail = e + } + + l.head = e +} + +// PushBack inserts the element e at the back of list l. +func (l *PacketBufferList) PushBack(e *PacketBuffer) { + linker := PacketBufferElementMapper{}.linkerFor(e) + linker.SetNext(nil) + linker.SetPrev(l.tail) + if l.tail != nil { + PacketBufferElementMapper{}.linkerFor(l.tail).SetNext(e) + } else { + l.head = e + } + + l.tail = e +} + +// PushBackList inserts list m at the end of list l, emptying m. +func (l *PacketBufferList) PushBackList(m *PacketBufferList) { + if l.head == nil { + l.head = m.head + l.tail = m.tail + } else if m.head != nil { + PacketBufferElementMapper{}.linkerFor(l.tail).SetNext(m.head) + PacketBufferElementMapper{}.linkerFor(m.head).SetPrev(l.tail) + + l.tail = m.tail + } + m.head = nil + m.tail = nil +} + +// InsertAfter inserts e after b. +func (l *PacketBufferList) InsertAfter(b, e *PacketBuffer) { + bLinker := PacketBufferElementMapper{}.linkerFor(b) + eLinker := PacketBufferElementMapper{}.linkerFor(e) + + a := bLinker.Next() + + eLinker.SetNext(a) + eLinker.SetPrev(b) + bLinker.SetNext(e) + + if a != nil { + PacketBufferElementMapper{}.linkerFor(a).SetPrev(e) + } else { + l.tail = e + } +} + +// InsertBefore inserts e before a. +func (l *PacketBufferList) InsertBefore(a, e *PacketBuffer) { + aLinker := PacketBufferElementMapper{}.linkerFor(a) + eLinker := PacketBufferElementMapper{}.linkerFor(e) + + b := aLinker.Prev() + eLinker.SetNext(a) + eLinker.SetPrev(b) + aLinker.SetPrev(e) + + if b != nil { + PacketBufferElementMapper{}.linkerFor(b).SetNext(e) + } else { + l.head = e + } +} + +// Remove removes e from l. +func (l *PacketBufferList) Remove(e *PacketBuffer) { + linker := PacketBufferElementMapper{}.linkerFor(e) + prev := linker.Prev() + next := linker.Next() + + if prev != nil { + PacketBufferElementMapper{}.linkerFor(prev).SetNext(next) + } else { + l.head = next + } + + if next != nil { + PacketBufferElementMapper{}.linkerFor(next).SetPrev(prev) + } else { + l.tail = prev + } + + linker.SetNext(nil) + linker.SetPrev(nil) +} + +// Entry is a default implementation of Linker. Users can add anonymous fields +// of this type to their structs to make them automatically implement the +// methods needed by List. +// +// +stateify savable +type PacketBufferEntry struct { + next *PacketBuffer + prev *PacketBuffer +} + +// Next returns the entry that follows e in the list. +func (e *PacketBufferEntry) Next() *PacketBuffer { + return e.next +} + +// Prev returns the entry that precedes e in the list. +func (e *PacketBufferEntry) Prev() *PacketBuffer { + return e.prev +} + +// SetNext assigns 'entry' as the entry that follows e in the list. +func (e *PacketBufferEntry) SetNext(elem *PacketBuffer) { + e.next = elem +} + +// SetPrev assigns 'entry' as the entry that precedes e in the list. +func (e *PacketBufferEntry) SetPrev(elem *PacketBuffer) { + e.prev = elem +} diff --git a/pkg/tcpip/stack/stack_state_autogen.go b/pkg/tcpip/stack/stack_state_autogen.go new file mode 100644 index 000000000..32d310c2f --- /dev/null +++ b/pkg/tcpip/stack/stack_state_autogen.go @@ -0,0 +1,157 @@ +// automatically generated by stateify. + +package stack + +import ( + "gvisor.dev/gvisor/pkg/state" +) + +func (x *linkAddrEntryList) beforeSave() {} +func (x *linkAddrEntryList) save(m state.Map) { + x.beforeSave() + m.Save("head", &x.head) + m.Save("tail", &x.tail) +} + +func (x *linkAddrEntryList) afterLoad() {} +func (x *linkAddrEntryList) load(m state.Map) { + m.Load("head", &x.head) + m.Load("tail", &x.tail) +} + +func (x *linkAddrEntryEntry) beforeSave() {} +func (x *linkAddrEntryEntry) save(m state.Map) { + x.beforeSave() + m.Save("next", &x.next) + m.Save("prev", &x.prev) +} + +func (x *linkAddrEntryEntry) afterLoad() {} +func (x *linkAddrEntryEntry) load(m state.Map) { + m.Load("next", &x.next) + m.Load("prev", &x.prev) +} + +func (x *PacketBufferList) beforeSave() {} +func (x *PacketBufferList) save(m state.Map) { + x.beforeSave() + m.Save("head", &x.head) + m.Save("tail", &x.tail) +} + +func (x *PacketBufferList) afterLoad() {} +func (x *PacketBufferList) load(m state.Map) { + m.Load("head", &x.head) + m.Load("tail", &x.tail) +} + +func (x *PacketBufferEntry) beforeSave() {} +func (x *PacketBufferEntry) save(m state.Map) { + x.beforeSave() + m.Save("next", &x.next) + m.Save("prev", &x.prev) +} + +func (x *PacketBufferEntry) afterLoad() {} +func (x *PacketBufferEntry) load(m state.Map) { + m.Load("next", &x.next) + m.Load("prev", &x.prev) +} + +func (x *TransportEndpointID) beforeSave() {} +func (x *TransportEndpointID) save(m state.Map) { + x.beforeSave() + m.Save("LocalPort", &x.LocalPort) + m.Save("LocalAddress", &x.LocalAddress) + m.Save("RemotePort", &x.RemotePort) + m.Save("RemoteAddress", &x.RemoteAddress) +} + +func (x *TransportEndpointID) afterLoad() {} +func (x *TransportEndpointID) load(m state.Map) { + m.Load("LocalPort", &x.LocalPort) + m.Load("LocalAddress", &x.LocalAddress) + m.Load("RemotePort", &x.RemotePort) + m.Load("RemoteAddress", &x.RemoteAddress) +} + +func (x *GSOType) save(m state.Map) { + m.SaveValue("", (int)(*x)) +} + +func (x *GSOType) load(m state.Map) { + m.LoadValue("", new(int), func(y interface{}) { *x = (GSOType)(y.(int)) }) +} + +func (x *GSO) beforeSave() {} +func (x *GSO) save(m state.Map) { + x.beforeSave() + m.Save("Type", &x.Type) + m.Save("NeedsCsum", &x.NeedsCsum) + m.Save("CsumOffset", &x.CsumOffset) + m.Save("MSS", &x.MSS) + m.Save("L3HdrLen", &x.L3HdrLen) + m.Save("MaxSize", &x.MaxSize) +} + +func (x *GSO) afterLoad() {} +func (x *GSO) load(m state.Map) { + m.Load("Type", &x.Type) + m.Load("NeedsCsum", &x.NeedsCsum) + m.Load("CsumOffset", &x.CsumOffset) + m.Load("MSS", &x.MSS) + m.Load("L3HdrLen", &x.L3HdrLen) + m.Load("MaxSize", &x.MaxSize) +} + +func (x *TransportEndpointInfo) beforeSave() {} +func (x *TransportEndpointInfo) save(m state.Map) { + x.beforeSave() + m.Save("NetProto", &x.NetProto) + m.Save("TransProto", &x.TransProto) + m.Save("ID", &x.ID) + m.Save("BindNICID", &x.BindNICID) + m.Save("BindAddr", &x.BindAddr) + m.Save("RegisterNICID", &x.RegisterNICID) +} + +func (x *TransportEndpointInfo) afterLoad() {} +func (x *TransportEndpointInfo) load(m state.Map) { + m.Load("NetProto", &x.NetProto) + m.Load("TransProto", &x.TransProto) + m.Load("ID", &x.ID) + m.Load("BindNICID", &x.BindNICID) + m.Load("BindAddr", &x.BindAddr) + m.Load("RegisterNICID", &x.RegisterNICID) +} + +func (x *multiPortEndpoint) beforeSave() {} +func (x *multiPortEndpoint) save(m state.Map) { + x.beforeSave() + m.Save("demux", &x.demux) + m.Save("netProto", &x.netProto) + m.Save("transProto", &x.transProto) + m.Save("endpoints", &x.endpoints) + m.Save("flags", &x.flags) +} + +func (x *multiPortEndpoint) afterLoad() {} +func (x *multiPortEndpoint) load(m state.Map) { + m.Load("demux", &x.demux) + m.Load("netProto", &x.netProto) + m.Load("transProto", &x.transProto) + m.Load("endpoints", &x.endpoints) + m.Load("flags", &x.flags) +} + +func init() { + state.Register("pkg/tcpip/stack.linkAddrEntryList", (*linkAddrEntryList)(nil), state.Fns{Save: (*linkAddrEntryList).save, Load: (*linkAddrEntryList).load}) + state.Register("pkg/tcpip/stack.linkAddrEntryEntry", (*linkAddrEntryEntry)(nil), state.Fns{Save: (*linkAddrEntryEntry).save, Load: (*linkAddrEntryEntry).load}) + state.Register("pkg/tcpip/stack.PacketBufferList", (*PacketBufferList)(nil), state.Fns{Save: (*PacketBufferList).save, Load: (*PacketBufferList).load}) + state.Register("pkg/tcpip/stack.PacketBufferEntry", (*PacketBufferEntry)(nil), state.Fns{Save: (*PacketBufferEntry).save, Load: (*PacketBufferEntry).load}) + state.Register("pkg/tcpip/stack.TransportEndpointID", (*TransportEndpointID)(nil), state.Fns{Save: (*TransportEndpointID).save, Load: (*TransportEndpointID).load}) + state.Register("pkg/tcpip/stack.GSOType", (*GSOType)(nil), state.Fns{Save: (*GSOType).save, Load: (*GSOType).load}) + state.Register("pkg/tcpip/stack.GSO", (*GSO)(nil), state.Fns{Save: (*GSO).save, Load: (*GSO).load}) + state.Register("pkg/tcpip/stack.TransportEndpointInfo", (*TransportEndpointInfo)(nil), state.Fns{Save: (*TransportEndpointInfo).save, Load: (*TransportEndpointInfo).load}) + state.Register("pkg/tcpip/stack.multiPortEndpoint", (*multiPortEndpoint)(nil), state.Fns{Save: (*multiPortEndpoint).save, Load: (*multiPortEndpoint).load}) +} diff --git a/pkg/tcpip/stack/stack_test.go b/pkg/tcpip/stack/stack_test.go deleted file mode 100644 index ffef9bc2c..000000000 --- a/pkg/tcpip/stack/stack_test.go +++ /dev/null @@ -1,3340 +0,0 @@ -// 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 stack_test contains tests for the stack. It is in its own package so -// that the tests can also validate that all definitions needed to implement -// transport and network protocols are properly exported by the stack package. -package stack_test - -import ( - "bytes" - "fmt" - "math" - "sort" - "strings" - "testing" - "time" - - "github.com/google/go-cmp/cmp" - "gvisor.dev/gvisor/pkg/rand" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/link/channel" - "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" -) - -const ( - fakeNetNumber tcpip.NetworkProtocolNumber = math.MaxUint32 - fakeNetHeaderLen = 12 - fakeDefaultPrefixLen = 8 - - // fakeControlProtocol is used for control packets that represent - // destination port unreachable. - fakeControlProtocol tcpip.TransportProtocolNumber = 2 - - // defaultMTU 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. - defaultMTU = 65536 - - dstAddrOffset = 0 - srcAddrOffset = 1 - protocolNumberOffset = 2 -) - -// fakeNetworkEndpoint is a network-layer protocol endpoint. It counts sent and -// received packets; the counts of all endpoints are aggregated in the protocol -// descriptor. -// -// Headers of this protocol are fakeNetHeaderLen 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 fakeNetworkEndpoint struct { - nicID tcpip.NICID - id stack.NetworkEndpointID - prefixLen int - proto *fakeNetworkProtocol - dispatcher stack.TransportDispatcher - ep stack.LinkEndpoint -} - -func (f *fakeNetworkEndpoint) MTU() uint32 { - return f.ep.MTU() - uint32(f.MaxHeaderLength()) -} - -func (f *fakeNetworkEndpoint) NICID() tcpip.NICID { - return f.nicID -} - -func (f *fakeNetworkEndpoint) PrefixLen() int { - return f.prefixLen -} - -func (*fakeNetworkEndpoint) DefaultTTL() uint8 { - return 123 -} - -func (f *fakeNetworkEndpoint) ID() *stack.NetworkEndpointID { - return &f.id -} - -func (f *fakeNetworkEndpoint) HandlePacket(r *stack.Route, pkt *stack.PacketBuffer) { - // Increment the received packet count in the protocol descriptor. - f.proto.packetCount[int(f.id.LocalAddress[0])%len(f.proto.packetCount)]++ - - // Handle control packets. - if pkt.NetworkHeader[protocolNumberOffset] == uint8(fakeControlProtocol) { - nb, ok := pkt.Data.PullUp(fakeNetHeaderLen) - if !ok { - return - } - pkt.Data.TrimFront(fakeNetHeaderLen) - f.dispatcher.DeliverTransportControlPacket( - tcpip.Address(nb[srcAddrOffset:srcAddrOffset+1]), - tcpip.Address(nb[dstAddrOffset:dstAddrOffset+1]), - fakeNetNumber, - tcpip.TransportProtocolNumber(nb[protocolNumberOffset]), - stack.ControlPortUnreachable, 0, pkt) - return - } - - // Dispatch the packet to the transport protocol. - f.dispatcher.DeliverTransportPacket(r, tcpip.TransportProtocolNumber(pkt.NetworkHeader[protocolNumberOffset]), pkt) -} - -func (f *fakeNetworkEndpoint) MaxHeaderLength() uint16 { - return f.ep.MaxHeaderLength() + fakeNetHeaderLen -} - -func (f *fakeNetworkEndpoint) PseudoHeaderChecksum(protocol tcpip.TransportProtocolNumber, dstAddr tcpip.Address) uint16 { - return 0 -} - -func (f *fakeNetworkEndpoint) Capabilities() stack.LinkEndpointCapabilities { - return f.ep.Capabilities() -} - -func (f *fakeNetworkEndpoint) NetworkProtocolNumber() tcpip.NetworkProtocolNumber { - return f.proto.Number() -} - -func (f *fakeNetworkEndpoint) WritePacket(r *stack.Route, gso *stack.GSO, params stack.NetworkHeaderParams, pkt *stack.PacketBuffer) *tcpip.Error { - // Increment the sent packet count in the protocol descriptor. - f.proto.sendPacketCount[int(r.RemoteAddress[0])%len(f.proto.sendPacketCount)]++ - - // Add the protocol's header to the packet and send it to the link - // endpoint. - pkt.NetworkHeader = pkt.Header.Prepend(fakeNetHeaderLen) - pkt.NetworkHeader[dstAddrOffset] = r.RemoteAddress[0] - pkt.NetworkHeader[srcAddrOffset] = f.id.LocalAddress[0] - pkt.NetworkHeader[protocolNumberOffset] = byte(params.Protocol) - - if r.Loop&stack.PacketLoop != 0 { - f.HandlePacket(r, pkt) - } - if r.Loop&stack.PacketOut == 0 { - return nil - } - - return f.ep.WritePacket(r, gso, fakeNetNumber, pkt) -} - -// WritePackets implements stack.LinkEndpoint.WritePackets. -func (f *fakeNetworkEndpoint) WritePackets(r *stack.Route, gso *stack.GSO, pkts stack.PacketBufferList, params stack.NetworkHeaderParams) (int, *tcpip.Error) { - panic("not implemented") -} - -func (*fakeNetworkEndpoint) WriteHeaderIncludedPacket(r *stack.Route, pkt *stack.PacketBuffer) *tcpip.Error { - return tcpip.ErrNotSupported -} - -func (*fakeNetworkEndpoint) Close() {} - -type fakeNetGoodOption bool - -type fakeNetBadOption bool - -type fakeNetInvalidValueOption int - -type fakeNetOptions struct { - good bool -} - -// fakeNetworkProtocol is a network-layer protocol descriptor. It aggregates the -// number of packets sent and received via endpoints of this protocol. The index -// where packets are added is given by the packet's destination address MOD 10. -type fakeNetworkProtocol struct { - packetCount [10]int - sendPacketCount [10]int - opts fakeNetOptions -} - -func (f *fakeNetworkProtocol) Number() tcpip.NetworkProtocolNumber { - return fakeNetNumber -} - -func (f *fakeNetworkProtocol) MinimumPacketSize() int { - return fakeNetHeaderLen -} - -func (f *fakeNetworkProtocol) DefaultPrefixLen() int { - return fakeDefaultPrefixLen -} - -func (f *fakeNetworkProtocol) PacketCount(intfAddr byte) int { - return f.packetCount[int(intfAddr)%len(f.packetCount)] -} - -func (*fakeNetworkProtocol) ParseAddresses(v buffer.View) (src, dst tcpip.Address) { - return tcpip.Address(v[srcAddrOffset : srcAddrOffset+1]), tcpip.Address(v[dstAddrOffset : dstAddrOffset+1]) -} - -func (f *fakeNetworkProtocol) NewEndpoint(nicID tcpip.NICID, addrWithPrefix tcpip.AddressWithPrefix, linkAddrCache stack.LinkAddressCache, dispatcher stack.TransportDispatcher, ep stack.LinkEndpoint, _ *stack.Stack) (stack.NetworkEndpoint, *tcpip.Error) { - return &fakeNetworkEndpoint{ - nicID: nicID, - id: stack.NetworkEndpointID{LocalAddress: addrWithPrefix.Address}, - prefixLen: addrWithPrefix.PrefixLen, - proto: f, - dispatcher: dispatcher, - ep: ep, - }, nil -} - -func (f *fakeNetworkProtocol) SetOption(option interface{}) *tcpip.Error { - switch v := option.(type) { - case fakeNetGoodOption: - f.opts.good = bool(v) - return nil - case fakeNetInvalidValueOption: - return tcpip.ErrInvalidOptionValue - default: - return tcpip.ErrUnknownProtocolOption - } -} - -func (f *fakeNetworkProtocol) Option(option interface{}) *tcpip.Error { - switch v := option.(type) { - case *fakeNetGoodOption: - *v = fakeNetGoodOption(f.opts.good) - return nil - default: - return tcpip.ErrUnknownProtocolOption - } -} - -// Close implements TransportProtocol.Close. -func (*fakeNetworkProtocol) Close() {} - -// Wait implements TransportProtocol.Wait. -func (*fakeNetworkProtocol) Wait() {} - -// Parse implements TransportProtocol.Parse. -func (*fakeNetworkProtocol) Parse(pkt *stack.PacketBuffer) (tcpip.TransportProtocolNumber, bool, bool) { - hdr, ok := pkt.Data.PullUp(fakeNetHeaderLen) - if !ok { - return 0, false, false - } - pkt.NetworkHeader = hdr - pkt.Data.TrimFront(fakeNetHeaderLen) - return tcpip.TransportProtocolNumber(hdr[protocolNumberOffset]), true, true -} - -func fakeNetFactory() stack.NetworkProtocol { - return &fakeNetworkProtocol{} -} - -// linkEPWithMockedAttach is a stack.LinkEndpoint that tests can use to verify -// that LinkEndpoint.Attach was called. -type linkEPWithMockedAttach struct { - stack.LinkEndpoint - attached bool -} - -// Attach implements stack.LinkEndpoint.Attach. -func (l *linkEPWithMockedAttach) Attach(d stack.NetworkDispatcher) { - l.LinkEndpoint.Attach(d) - l.attached = d != nil -} - -func (l *linkEPWithMockedAttach) isAttached() bool { - return l.attached -} - -func TestNetworkReceive(t *testing.T) { - // Create a stack with the fake network protocol, one nic, and two - // addresses attached to it: 1 & 2. - ep := channel.New(10, defaultMTU, "") - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x02"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - - buf := buffer.NewView(30) - - // Make sure packet with wrong address is not delivered. - buf[dstAddrOffset] = 3 - ep.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeNet.packetCount[1] != 0 { - t.Errorf("packetCount[1] = %d, want %d", fakeNet.packetCount[1], 0) - } - if fakeNet.packetCount[2] != 0 { - t.Errorf("packetCount[2] = %d, want %d", fakeNet.packetCount[2], 0) - } - - // Make sure packet is delivered to first endpoint. - buf[dstAddrOffset] = 1 - ep.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeNet.packetCount[1] != 1 { - t.Errorf("packetCount[1] = %d, want %d", fakeNet.packetCount[1], 1) - } - if fakeNet.packetCount[2] != 0 { - t.Errorf("packetCount[2] = %d, want %d", fakeNet.packetCount[2], 0) - } - - // Make sure packet is delivered to second endpoint. - buf[dstAddrOffset] = 2 - ep.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeNet.packetCount[1] != 1 { - t.Errorf("packetCount[1] = %d, want %d", fakeNet.packetCount[1], 1) - } - if fakeNet.packetCount[2] != 1 { - t.Errorf("packetCount[2] = %d, want %d", fakeNet.packetCount[2], 1) - } - - // Make sure packet is not delivered if protocol number is wrong. - ep.InjectInbound(fakeNetNumber-1, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeNet.packetCount[1] != 1 { - t.Errorf("packetCount[1] = %d, want %d", fakeNet.packetCount[1], 1) - } - if fakeNet.packetCount[2] != 1 { - t.Errorf("packetCount[2] = %d, want %d", fakeNet.packetCount[2], 1) - } - - // Make sure packet that is too small is dropped. - buf.CapLength(2) - ep.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeNet.packetCount[1] != 1 { - t.Errorf("packetCount[1] = %d, want %d", fakeNet.packetCount[1], 1) - } - if fakeNet.packetCount[2] != 1 { - t.Errorf("packetCount[2] = %d, want %d", fakeNet.packetCount[2], 1) - } -} - -func sendTo(s *stack.Stack, addr tcpip.Address, payload buffer.View) *tcpip.Error { - r, err := s.FindRoute(0, "", addr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - return err - } - defer r.Release() - return send(r, payload) -} - -func send(r stack.Route, payload buffer.View) *tcpip.Error { - hdr := buffer.NewPrependable(int(r.MaxHeaderLength())) - return r.WritePacket(nil /* gso */, stack.NetworkHeaderParams{Protocol: fakeTransNumber, TTL: 123, TOS: stack.DefaultTOS}, &stack.PacketBuffer{ - Header: hdr, - Data: payload.ToVectorisedView(), - }) -} - -func testSendTo(t *testing.T, s *stack.Stack, addr tcpip.Address, ep *channel.Endpoint, payload buffer.View) { - t.Helper() - ep.Drain() - if err := sendTo(s, addr, payload); err != nil { - t.Error("sendTo failed:", err) - } - if got, want := ep.Drain(), 1; got != want { - t.Errorf("sendTo packet count: got = %d, want %d", got, want) - } -} - -func testSend(t *testing.T, r stack.Route, ep *channel.Endpoint, payload buffer.View) { - t.Helper() - ep.Drain() - if err := send(r, payload); err != nil { - t.Error("send failed:", err) - } - if got, want := ep.Drain(), 1; got != want { - t.Errorf("send packet count: got = %d, want %d", got, want) - } -} - -func testFailingSend(t *testing.T, r stack.Route, ep *channel.Endpoint, payload buffer.View, wantErr *tcpip.Error) { - t.Helper() - if gotErr := send(r, payload); gotErr != wantErr { - t.Errorf("send failed: got = %s, want = %s ", gotErr, wantErr) - } -} - -func testFailingSendTo(t *testing.T, s *stack.Stack, addr tcpip.Address, ep *channel.Endpoint, payload buffer.View, wantErr *tcpip.Error) { - t.Helper() - if gotErr := sendTo(s, addr, payload); gotErr != wantErr { - t.Errorf("sendto failed: got = %s, want = %s ", gotErr, wantErr) - } -} - -func testRecv(t *testing.T, fakeNet *fakeNetworkProtocol, localAddrByte byte, ep *channel.Endpoint, buf buffer.View) { - t.Helper() - // testRecvInternal injects one packet, and we expect to receive it. - want := fakeNet.PacketCount(localAddrByte) + 1 - testRecvInternal(t, fakeNet, localAddrByte, ep, buf, want) -} - -func testFailingRecv(t *testing.T, fakeNet *fakeNetworkProtocol, localAddrByte byte, ep *channel.Endpoint, buf buffer.View) { - t.Helper() - // testRecvInternal injects one packet, and we do NOT expect to receive it. - want := fakeNet.PacketCount(localAddrByte) - testRecvInternal(t, fakeNet, localAddrByte, ep, buf, want) -} - -func testRecvInternal(t *testing.T, fakeNet *fakeNetworkProtocol, localAddrByte byte, ep *channel.Endpoint, buf buffer.View, want int) { - t.Helper() - ep.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if got := fakeNet.PacketCount(localAddrByte); got != want { - t.Errorf("receive packet count: got = %d, want %d", got, want) - } -} - -func TestNetworkSend(t *testing.T) { - // Create a stack with the fake network protocol, one nic, and one - // address: 1. The route table sends all packets through the only - // existing nic. - ep := channel.New(10, defaultMTU, "") - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("NewNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - // Make sure that the link-layer endpoint received the outbound packet. - testSendTo(t, s, "\x03", ep, nil) -} - -func TestNetworkSendMultiRoute(t *testing.T) { - // Create a stack with the fake network protocol, two nics, and two - // addresses per nic, the first nic has odd address, the second one has - // even addresses. - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep1 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep1); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x03"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - ep2 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(2, ep2); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(2, fakeNetNumber, "\x02"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - if err := s.AddAddress(2, fakeNetNumber, "\x04"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - // Set a route table that sends all packets with odd destination - // addresses through the first NIC, and all even destination address - // through the second one. - { - subnet0, err := tcpip.NewSubnet("\x00", "\x01") - if err != nil { - t.Fatal(err) - } - subnet1, err := tcpip.NewSubnet("\x01", "\x01") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{ - {Destination: subnet1, Gateway: "\x00", NIC: 1}, - {Destination: subnet0, Gateway: "\x00", NIC: 2}, - }) - } - - // Send a packet to an odd destination. - testSendTo(t, s, "\x05", ep1, nil) - - // Send a packet to an even destination. - testSendTo(t, s, "\x06", ep2, nil) -} - -func testRoute(t *testing.T, s *stack.Stack, nic tcpip.NICID, srcAddr, dstAddr, expectedSrcAddr tcpip.Address) { - r, err := s.FindRoute(nic, srcAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatal("FindRoute failed:", err) - } - - defer r.Release() - - if r.LocalAddress != expectedSrcAddr { - t.Fatalf("Bad source address: expected %v, got %v", expectedSrcAddr, r.LocalAddress) - } - - if r.RemoteAddress != dstAddr { - t.Fatalf("Bad destination address: expected %v, got %v", dstAddr, r.RemoteAddress) - } -} - -func testNoRoute(t *testing.T, s *stack.Stack, nic tcpip.NICID, srcAddr, dstAddr tcpip.Address) { - _, err := s.FindRoute(nic, srcAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err != tcpip.ErrNoRoute { - t.Fatalf("FindRoute returned unexpected error, got = %v, want = %s", err, tcpip.ErrNoRoute) - } -} - -// TestAttachToLinkEndpointImmediately tests that a LinkEndpoint is attached to -// a NetworkDispatcher when the NIC is created. -func TestAttachToLinkEndpointImmediately(t *testing.T) { - const nicID = 1 - - tests := []struct { - name string - nicOpts stack.NICOptions - }{ - { - name: "Create enabled NIC", - nicOpts: stack.NICOptions{Disabled: false}, - }, - { - name: "Create disabled NIC", - nicOpts: stack.NICOptions{Disabled: true}, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - e := linkEPWithMockedAttach{ - LinkEndpoint: loopback.New(), - } - - if err := s.CreateNICWithOptions(nicID, &e, test.nicOpts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, test.nicOpts, err) - } - if !e.isAttached() { - t.Fatal("link endpoint not attached to a network dispatcher") - } - }) - } -} - -func TestDisableUnknownNIC(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - if err := s.DisableNIC(1); err != tcpip.ErrUnknownNICID { - t.Fatalf("got s.DisableNIC(1) = %v, want = %s", err, tcpip.ErrUnknownNICID) - } -} - -func TestDisabledNICsNICInfoAndCheckNIC(t *testing.T) { - const nicID = 1 - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - e := loopback.New() - nicOpts := stack.NICOptions{Disabled: true} - if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, nicOpts, err) - } - - checkNIC := func(enabled bool) { - t.Helper() - - allNICInfo := s.NICInfo() - nicInfo, ok := allNICInfo[nicID] - if !ok { - t.Errorf("entry for %d missing from allNICInfo = %+v", nicID, allNICInfo) - } else if nicInfo.Flags.Running != enabled { - t.Errorf("got nicInfo.Flags.Running = %t, want = %t", nicInfo.Flags.Running, enabled) - } - - if got := s.CheckNIC(nicID); got != enabled { - t.Errorf("got s.CheckNIC(%d) = %t, want = %t", nicID, got, enabled) - } - } - - // NIC should initially report itself as disabled. - checkNIC(false) - - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - checkNIC(true) - - // If the NIC is not reporting a correct enabled status, we cannot trust the - // next check so end the test here. - if t.Failed() { - t.FailNow() - } - - if err := s.DisableNIC(nicID); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID, err) - } - checkNIC(false) -} - -func TestRemoveUnknownNIC(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - if err := s.RemoveNIC(1); err != tcpip.ErrUnknownNICID { - t.Fatalf("got s.RemoveNIC(1) = %v, want = %s", err, tcpip.ErrUnknownNICID) - } -} - -func TestRemoveNIC(t *testing.T) { - const nicID = 1 - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - e := linkEPWithMockedAttach{ - LinkEndpoint: loopback.New(), - } - if err := s.CreateNIC(nicID, &e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - // NIC should be present in NICInfo and attached to a NetworkDispatcher. - allNICInfo := s.NICInfo() - if _, ok := allNICInfo[nicID]; !ok { - t.Errorf("entry for %d missing from allNICInfo = %+v", nicID, allNICInfo) - } - if !e.isAttached() { - t.Fatal("link endpoint not attached to a network dispatcher") - } - - // Removing a NIC should remove it from NICInfo and e should be detached from - // the NetworkDispatcher. - if err := s.RemoveNIC(nicID); err != nil { - t.Fatalf("s.RemoveNIC(%d): %s", nicID, err) - } - if nicInfo, ok := s.NICInfo()[nicID]; ok { - t.Errorf("got unexpected NICInfo entry for deleted NIC %d = %+v", nicID, nicInfo) - } - if e.isAttached() { - t.Error("link endpoint for removed NIC still attached to a network dispatcher") - } -} - -func TestRouteWithDownNIC(t *testing.T) { - tests := []struct { - name string - downFn func(s *stack.Stack, nicID tcpip.NICID) *tcpip.Error - upFn func(s *stack.Stack, nicID tcpip.NICID) *tcpip.Error - }{ - { - name: "Disabled NIC", - downFn: (*stack.Stack).DisableNIC, - upFn: (*stack.Stack).EnableNIC, - }, - - // Once a NIC is removed, it cannot be brought up. - { - name: "Removed NIC", - downFn: (*stack.Stack).RemoveNIC, - }, - } - - const unspecifiedNIC = 0 - const nicID1 = 1 - const nicID2 = 2 - const addr1 = tcpip.Address("\x01") - const addr2 = tcpip.Address("\x02") - const nic1Dst = tcpip.Address("\x05") - const nic2Dst = tcpip.Address("\x06") - - setup := func(t *testing.T) (*stack.Stack, *channel.Endpoint, *channel.Endpoint) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep1 := channel.New(1, defaultMTU, "") - if err := s.CreateNIC(nicID1, ep1); err != nil { - t.Fatalf("CreateNIC(%d, _): %s", nicID1, err) - } - - if err := s.AddAddress(nicID1, fakeNetNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s): %s", nicID1, fakeNetNumber, addr1, err) - } - - ep2 := channel.New(1, defaultMTU, "") - if err := s.CreateNIC(nicID2, ep2); err != nil { - t.Fatalf("CreateNIC(%d, _): %s", nicID2, err) - } - - if err := s.AddAddress(nicID2, fakeNetNumber, addr2); err != nil { - t.Fatalf("AddAddress(%d, %d, %s): %s", nicID2, fakeNetNumber, addr2, err) - } - - // Set a route table that sends all packets with odd destination - // addresses through the first NIC, and all even destination address - // through the second one. - { - subnet0, err := tcpip.NewSubnet("\x00", "\x01") - if err != nil { - t.Fatal(err) - } - subnet1, err := tcpip.NewSubnet("\x01", "\x01") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{ - {Destination: subnet1, Gateway: "\x00", NIC: nicID1}, - {Destination: subnet0, Gateway: "\x00", NIC: nicID2}, - }) - } - - return s, ep1, ep2 - } - - // Tests that routes through a down NIC are not used when looking up a route - // for a destination. - t.Run("Find", func(t *testing.T) { - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - s, _, _ := setup(t) - - // Test routes to odd address. - testRoute(t, s, unspecifiedNIC, "", "\x05", addr1) - testRoute(t, s, unspecifiedNIC, addr1, "\x05", addr1) - testRoute(t, s, nicID1, addr1, "\x05", addr1) - - // Test routes to even address. - testRoute(t, s, unspecifiedNIC, "", "\x06", addr2) - testRoute(t, s, unspecifiedNIC, addr2, "\x06", addr2) - testRoute(t, s, nicID2, addr2, "\x06", addr2) - - // Bringing NIC1 down should result in no routes to odd addresses. Routes to - // even addresses should continue to be available as NIC2 is still up. - if err := test.downFn(s, nicID1); err != nil { - t.Fatalf("test.downFn(_, %d): %s", nicID1, err) - } - testNoRoute(t, s, unspecifiedNIC, "", nic1Dst) - testNoRoute(t, s, unspecifiedNIC, addr1, nic1Dst) - testNoRoute(t, s, nicID1, addr1, nic1Dst) - testRoute(t, s, unspecifiedNIC, "", nic2Dst, addr2) - testRoute(t, s, unspecifiedNIC, addr2, nic2Dst, addr2) - testRoute(t, s, nicID2, addr2, nic2Dst, addr2) - - // Bringing NIC2 down should result in no routes to even addresses. No - // route should be available to any address as routes to odd addresses - // were made unavailable by bringing NIC1 down above. - if err := test.downFn(s, nicID2); err != nil { - t.Fatalf("test.downFn(_, %d): %s", nicID2, err) - } - testNoRoute(t, s, unspecifiedNIC, "", nic1Dst) - testNoRoute(t, s, unspecifiedNIC, addr1, nic1Dst) - testNoRoute(t, s, nicID1, addr1, nic1Dst) - testNoRoute(t, s, unspecifiedNIC, "", nic2Dst) - testNoRoute(t, s, unspecifiedNIC, addr2, nic2Dst) - testNoRoute(t, s, nicID2, addr2, nic2Dst) - - if upFn := test.upFn; upFn != nil { - // Bringing NIC1 up should make routes to odd addresses available - // again. Routes to even addresses should continue to be unavailable - // as NIC2 is still down. - if err := upFn(s, nicID1); err != nil { - t.Fatalf("test.upFn(_, %d): %s", nicID1, err) - } - testRoute(t, s, unspecifiedNIC, "", nic1Dst, addr1) - testRoute(t, s, unspecifiedNIC, addr1, nic1Dst, addr1) - testRoute(t, s, nicID1, addr1, nic1Dst, addr1) - testNoRoute(t, s, unspecifiedNIC, "", nic2Dst) - testNoRoute(t, s, unspecifiedNIC, addr2, nic2Dst) - testNoRoute(t, s, nicID2, addr2, nic2Dst) - } - }) - } - }) - - // Tests that writing a packet using a Route through a down NIC fails. - t.Run("WritePacket", func(t *testing.T) { - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - s, ep1, ep2 := setup(t) - - r1, err := s.FindRoute(nicID1, addr1, nic1Dst, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Errorf("FindRoute(%d, %s, %s, %d, false): %s", nicID1, addr1, nic1Dst, fakeNetNumber, err) - } - defer r1.Release() - - r2, err := s.FindRoute(nicID2, addr2, nic2Dst, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Errorf("FindRoute(%d, %s, %s, %d, false): %s", nicID2, addr2, nic2Dst, fakeNetNumber, err) - } - defer r2.Release() - - // If we failed to get routes r1 or r2, we cannot proceed with the test. - if t.Failed() { - t.FailNow() - } - - buf := buffer.View([]byte{1}) - testSend(t, r1, ep1, buf) - testSend(t, r2, ep2, buf) - - // Writes with Routes that use NIC1 after being brought down should fail. - if err := test.downFn(s, nicID1); err != nil { - t.Fatalf("test.downFn(_, %d): %s", nicID1, err) - } - testFailingSend(t, r1, ep1, buf, tcpip.ErrInvalidEndpointState) - testSend(t, r2, ep2, buf) - - // Writes with Routes that use NIC2 after being brought down should fail. - if err := test.downFn(s, nicID2); err != nil { - t.Fatalf("test.downFn(_, %d): %s", nicID2, err) - } - testFailingSend(t, r1, ep1, buf, tcpip.ErrInvalidEndpointState) - testFailingSend(t, r2, ep2, buf, tcpip.ErrInvalidEndpointState) - - if upFn := test.upFn; upFn != nil { - // Writes with Routes that use NIC1 after being brought up should - // succeed. - // - // TODO(b/147015577): Should we instead completely invalidate all - // Routes that were bound to a NIC that was brought down at some - // point? - if err := upFn(s, nicID1); err != nil { - t.Fatalf("test.upFn(_, %d): %s", nicID1, err) - } - testSend(t, r1, ep1, buf) - testFailingSend(t, r2, ep2, buf, tcpip.ErrInvalidEndpointState) - } - }) - } - }) -} - -func TestRoutes(t *testing.T) { - // Create a stack with the fake network protocol, two nics, and two - // addresses per nic, the first nic has odd address, the second one has - // even addresses. - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep1 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep1); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x03"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - ep2 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(2, ep2); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(2, fakeNetNumber, "\x02"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - if err := s.AddAddress(2, fakeNetNumber, "\x04"); err != nil { - t.Fatal("AddAddress failed:", err) - } - - // Set a route table that sends all packets with odd destination - // addresses through the first NIC, and all even destination address - // through the second one. - { - subnet0, err := tcpip.NewSubnet("\x00", "\x01") - if err != nil { - t.Fatal(err) - } - subnet1, err := tcpip.NewSubnet("\x01", "\x01") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{ - {Destination: subnet1, Gateway: "\x00", NIC: 1}, - {Destination: subnet0, Gateway: "\x00", NIC: 2}, - }) - } - - // Test routes to odd address. - testRoute(t, s, 0, "", "\x05", "\x01") - testRoute(t, s, 0, "\x01", "\x05", "\x01") - testRoute(t, s, 1, "\x01", "\x05", "\x01") - testRoute(t, s, 0, "\x03", "\x05", "\x03") - testRoute(t, s, 1, "\x03", "\x05", "\x03") - - // Test routes to even address. - testRoute(t, s, 0, "", "\x06", "\x02") - testRoute(t, s, 0, "\x02", "\x06", "\x02") - testRoute(t, s, 2, "\x02", "\x06", "\x02") - testRoute(t, s, 0, "\x04", "\x06", "\x04") - testRoute(t, s, 2, "\x04", "\x06", "\x04") - - // Try to send to odd numbered address from even numbered ones, then - // vice-versa. - testNoRoute(t, s, 0, "\x02", "\x05") - testNoRoute(t, s, 2, "\x02", "\x05") - testNoRoute(t, s, 0, "\x04", "\x05") - testNoRoute(t, s, 2, "\x04", "\x05") - - testNoRoute(t, s, 0, "\x01", "\x06") - testNoRoute(t, s, 1, "\x01", "\x06") - testNoRoute(t, s, 0, "\x03", "\x06") - testNoRoute(t, s, 1, "\x03", "\x06") -} - -func TestAddressRemoval(t *testing.T) { - const localAddrByte byte = 0x01 - localAddr := tcpip.Address([]byte{localAddrByte}) - remoteAddr := tcpip.Address("\x02") - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, localAddr); err != nil { - t.Fatal("AddAddress failed:", err) - } - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - - buf := buffer.NewView(30) - - // Send and receive packets, and verify they are received. - buf[dstAddrOffset] = localAddrByte - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSendTo(t, s, remoteAddr, ep, nil) - - // Remove the address, then check that send/receive doesn't work anymore. - if err := s.RemoveAddress(1, localAddr); err != nil { - t.Fatal("RemoveAddress failed:", err) - } - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - testFailingSendTo(t, s, remoteAddr, ep, nil, tcpip.ErrNoRoute) - - // Check that removing the same address fails. - if err := s.RemoveAddress(1, localAddr); err != tcpip.ErrBadLocalAddress { - t.Fatalf("RemoveAddress returned unexpected error, got = %v, want = %s", err, tcpip.ErrBadLocalAddress) - } -} - -func TestAddressRemovalWithRouteHeld(t *testing.T) { - const localAddrByte byte = 0x01 - localAddr := tcpip.Address([]byte{localAddrByte}) - remoteAddr := tcpip.Address("\x02") - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatalf("CreateNIC failed: %v", err) - } - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - buf := buffer.NewView(30) - - if err := s.AddAddress(1, fakeNetNumber, localAddr); err != nil { - t.Fatal("AddAddress failed:", err) - } - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - r, err := s.FindRoute(0, "", remoteAddr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatal("FindRoute failed:", err) - } - - // Send and receive packets, and verify they are received. - buf[dstAddrOffset] = localAddrByte - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSend(t, r, ep, nil) - testSendTo(t, s, remoteAddr, ep, nil) - - // Remove the address, then check that send/receive doesn't work anymore. - if err := s.RemoveAddress(1, localAddr); err != nil { - t.Fatal("RemoveAddress failed:", err) - } - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - testFailingSend(t, r, ep, nil, tcpip.ErrInvalidEndpointState) - testFailingSendTo(t, s, remoteAddr, ep, nil, tcpip.ErrNoRoute) - - // Check that removing the same address fails. - if err := s.RemoveAddress(1, localAddr); err != tcpip.ErrBadLocalAddress { - t.Fatalf("RemoveAddress returned unexpected error, got = %v, want = %s", err, tcpip.ErrBadLocalAddress) - } -} - -func verifyAddress(t *testing.T, s *stack.Stack, nicID tcpip.NICID, addr tcpip.Address) { - t.Helper() - info, ok := s.NICInfo()[nicID] - if !ok { - t.Fatalf("NICInfo() failed to find nicID=%d", nicID) - } - if len(addr) == 0 { - // No address given, verify that there is no address assigned to the NIC. - for _, a := range info.ProtocolAddresses { - if a.Protocol == fakeNetNumber && a.AddressWithPrefix != (tcpip.AddressWithPrefix{}) { - t.Errorf("verify no-address: got = %s, want = %s", a.AddressWithPrefix, (tcpip.AddressWithPrefix{})) - } - } - return - } - // Address given, verify the address is assigned to the NIC and no other - // address is. - found := false - for _, a := range info.ProtocolAddresses { - if a.Protocol == fakeNetNumber { - if a.AddressWithPrefix.Address == addr { - found = true - } else { - t.Errorf("verify address: got = %s, want = %s", a.AddressWithPrefix.Address, addr) - } - } - } - if !found { - t.Errorf("verify address: couldn't find %s on the NIC", addr) - } -} - -func TestEndpointExpiration(t *testing.T) { - const ( - localAddrByte byte = 0x01 - remoteAddr tcpip.Address = "\x03" - noAddr tcpip.Address = "" - nicID tcpip.NICID = 1 - ) - localAddr := tcpip.Address([]byte{localAddrByte}) - - for _, promiscuous := range []bool{true, false} { - for _, spoofing := range []bool{true, false} { - t.Run(fmt.Sprintf("promiscuous=%t spoofing=%t", promiscuous, spoofing), func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - buf := buffer.NewView(30) - buf[dstAddrOffset] = localAddrByte - - if promiscuous { - if err := s.SetPromiscuousMode(nicID, true); err != nil { - t.Fatal("SetPromiscuousMode failed:", err) - } - } - - if spoofing { - if err := s.SetSpoofing(nicID, true); err != nil { - t.Fatal("SetSpoofing failed:", err) - } - } - - // 1. No Address yet, send should only work for spoofing, receive for - // promiscuous mode. - //----------------------- - verifyAddress(t, s, nicID, noAddr) - if promiscuous { - testRecv(t, fakeNet, localAddrByte, ep, buf) - } else { - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - } - if spoofing { - // FIXME(b/139841518):Spoofing doesn't work if there is no primary address. - // testSendTo(t, s, remoteAddr, ep, nil) - } else { - testFailingSendTo(t, s, remoteAddr, ep, nil, tcpip.ErrNoRoute) - } - - // 2. Add Address, everything should work. - //----------------------- - if err := s.AddAddress(nicID, fakeNetNumber, localAddr); err != nil { - t.Fatal("AddAddress failed:", err) - } - verifyAddress(t, s, nicID, localAddr) - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSendTo(t, s, remoteAddr, ep, nil) - - // 3. Remove the address, send should only work for spoofing, receive - // for promiscuous mode. - //----------------------- - if err := s.RemoveAddress(nicID, localAddr); err != nil { - t.Fatal("RemoveAddress failed:", err) - } - verifyAddress(t, s, nicID, noAddr) - if promiscuous { - testRecv(t, fakeNet, localAddrByte, ep, buf) - } else { - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - } - if spoofing { - // FIXME(b/139841518):Spoofing doesn't work if there is no primary address. - // testSendTo(t, s, remoteAddr, ep, nil) - } else { - testFailingSendTo(t, s, remoteAddr, ep, nil, tcpip.ErrNoRoute) - } - - // 4. Add Address back, everything should work again. - //----------------------- - if err := s.AddAddress(nicID, fakeNetNumber, localAddr); err != nil { - t.Fatal("AddAddress failed:", err) - } - verifyAddress(t, s, nicID, localAddr) - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSendTo(t, s, remoteAddr, ep, nil) - - // 5. Take a reference to the endpoint by getting a route. Verify that - // we can still send/receive, including sending using the route. - //----------------------- - r, err := s.FindRoute(0, "", remoteAddr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatal("FindRoute failed:", err) - } - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSendTo(t, s, remoteAddr, ep, nil) - testSend(t, r, ep, nil) - - // 6. Remove the address. Send should only work for spoofing, receive - // for promiscuous mode. - //----------------------- - if err := s.RemoveAddress(nicID, localAddr); err != nil { - t.Fatal("RemoveAddress failed:", err) - } - verifyAddress(t, s, nicID, noAddr) - if promiscuous { - testRecv(t, fakeNet, localAddrByte, ep, buf) - } else { - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - } - if spoofing { - testSend(t, r, ep, nil) - testSendTo(t, s, remoteAddr, ep, nil) - } else { - testFailingSend(t, r, ep, nil, tcpip.ErrInvalidEndpointState) - testFailingSendTo(t, s, remoteAddr, ep, nil, tcpip.ErrNoRoute) - } - - // 7. Add Address back, everything should work again. - //----------------------- - if err := s.AddAddress(nicID, fakeNetNumber, localAddr); err != nil { - t.Fatal("AddAddress failed:", err) - } - verifyAddress(t, s, nicID, localAddr) - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSendTo(t, s, remoteAddr, ep, nil) - testSend(t, r, ep, nil) - - // 8. Remove the route, sendTo/recv should still work. - //----------------------- - r.Release() - verifyAddress(t, s, nicID, localAddr) - testRecv(t, fakeNet, localAddrByte, ep, buf) - testSendTo(t, s, remoteAddr, ep, nil) - - // 9. Remove the address. Send should only work for spoofing, receive - // for promiscuous mode. - //----------------------- - if err := s.RemoveAddress(nicID, localAddr); err != nil { - t.Fatal("RemoveAddress failed:", err) - } - verifyAddress(t, s, nicID, noAddr) - if promiscuous { - testRecv(t, fakeNet, localAddrByte, ep, buf) - } else { - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - } - if spoofing { - // FIXME(b/139841518):Spoofing doesn't work if there is no primary address. - // testSendTo(t, s, remoteAddr, ep, nil) - } else { - testFailingSendTo(t, s, remoteAddr, ep, nil, tcpip.ErrNoRoute) - } - }) - } - } -} - -func TestPromiscuousMode(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - - buf := buffer.NewView(30) - - // Write a packet, and check that it doesn't get delivered as we don't - // have a matching endpoint. - const localAddrByte byte = 0x01 - buf[dstAddrOffset] = localAddrByte - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) - - // Set promiscuous mode, then check that packet is delivered. - if err := s.SetPromiscuousMode(1, true); err != nil { - t.Fatal("SetPromiscuousMode failed:", err) - } - testRecv(t, fakeNet, localAddrByte, ep, buf) - - // Check that we can't get a route as there is no local address. - _, err := s.FindRoute(0, "", "\x02", fakeNetNumber, false /* multicastLoop */) - if err != tcpip.ErrNoRoute { - t.Fatalf("FindRoute returned unexpected error: got = %v, want = %s", err, tcpip.ErrNoRoute) - } - - // Set promiscuous mode to false, then check that packet can't be - // delivered anymore. - if err := s.SetPromiscuousMode(1, false); err != nil { - t.Fatal("SetPromiscuousMode failed:", err) - } - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) -} - -func TestSpoofingWithAddress(t *testing.T) { - localAddr := tcpip.Address("\x01") - nonExistentLocalAddr := tcpip.Address("\x02") - dstAddr := tcpip.Address("\x03") - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - if err := s.AddAddress(1, fakeNetNumber, localAddr); err != nil { - t.Fatal("AddAddress failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - // With address spoofing disabled, FindRoute does not permit an address - // that was not added to the NIC to be used as the source. - r, err := s.FindRoute(0, nonExistentLocalAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err == nil { - t.Errorf("FindRoute succeeded with route %+v when it should have failed", r) - } - - // With address spoofing enabled, FindRoute permits any address to be used - // as the source. - if err := s.SetSpoofing(1, true); err != nil { - t.Fatal("SetSpoofing failed:", err) - } - r, err = s.FindRoute(0, nonExistentLocalAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatal("FindRoute failed:", err) - } - if r.LocalAddress != nonExistentLocalAddr { - t.Errorf("got Route.LocalAddress = %s, want = %s", r.LocalAddress, nonExistentLocalAddr) - } - if r.RemoteAddress != dstAddr { - t.Errorf("got Route.RemoteAddress = %s, want = %s", r.RemoteAddress, dstAddr) - } - // Sending a packet works. - testSendTo(t, s, dstAddr, ep, nil) - testSend(t, r, ep, nil) - - // FindRoute should also work with a local address that exists on the NIC. - r, err = s.FindRoute(0, localAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatal("FindRoute failed:", err) - } - if r.LocalAddress != localAddr { - t.Errorf("got Route.LocalAddress = %s, want = %s", r.LocalAddress, nonExistentLocalAddr) - } - if r.RemoteAddress != dstAddr { - t.Errorf("got Route.RemoteAddress = %s, want = %s", r.RemoteAddress, dstAddr) - } - // Sending a packet using the route works. - testSend(t, r, ep, nil) -} - -func TestSpoofingNoAddress(t *testing.T) { - nonExistentLocalAddr := tcpip.Address("\x01") - dstAddr := tcpip.Address("\x02") - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - // With address spoofing disabled, FindRoute does not permit an address - // that was not added to the NIC to be used as the source. - r, err := s.FindRoute(0, nonExistentLocalAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err == nil { - t.Errorf("FindRoute succeeded with route %+v when it should have failed", r) - } - // Sending a packet fails. - testFailingSendTo(t, s, dstAddr, ep, nil, tcpip.ErrNoRoute) - - // With address spoofing enabled, FindRoute permits any address to be used - // as the source. - if err := s.SetSpoofing(1, true); err != nil { - t.Fatal("SetSpoofing failed:", err) - } - r, err = s.FindRoute(0, nonExistentLocalAddr, dstAddr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatal("FindRoute failed:", err) - } - if r.LocalAddress != nonExistentLocalAddr { - t.Errorf("got Route.LocalAddress = %s, want = %s", r.LocalAddress, nonExistentLocalAddr) - } - if r.RemoteAddress != dstAddr { - t.Errorf("got Route.RemoteAddress = %s, want = %s", r.RemoteAddress, dstAddr) - } - // Sending a packet works. - // FIXME(b/139841518):Spoofing doesn't work if there is no primary address. - // testSendTo(t, s, remoteAddr, ep, nil) -} - -func verifyRoute(gotRoute, wantRoute stack.Route) error { - if gotRoute.LocalAddress != wantRoute.LocalAddress { - return fmt.Errorf("bad local address: got %s, want = %s", gotRoute.LocalAddress, wantRoute.LocalAddress) - } - if gotRoute.RemoteAddress != wantRoute.RemoteAddress { - return fmt.Errorf("bad remote address: got %s, want = %s", gotRoute.RemoteAddress, wantRoute.RemoteAddress) - } - if gotRoute.RemoteLinkAddress != wantRoute.RemoteLinkAddress { - return fmt.Errorf("bad remote link address: got %s, want = %s", gotRoute.RemoteLinkAddress, wantRoute.RemoteLinkAddress) - } - if gotRoute.NextHop != wantRoute.NextHop { - return fmt.Errorf("bad next-hop address: got %s, want = %s", gotRoute.NextHop, wantRoute.NextHop) - } - return nil -} - -func TestOutgoingBroadcastWithEmptyRouteTable(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - s.SetRouteTable([]tcpip.Route{}) - - // If there is no endpoint, it won't work. - if _, err := s.FindRoute(1, header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */); err != tcpip.ErrNetworkUnreachable { - t.Fatalf("got FindRoute(1, %s, %s, %d) = %s, want = %s", header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, err, tcpip.ErrNetworkUnreachable) - } - - protoAddr := tcpip.ProtocolAddress{Protocol: fakeNetNumber, AddressWithPrefix: tcpip.AddressWithPrefix{header.IPv4Any, 0}} - if err := s.AddProtocolAddress(1, protoAddr); err != nil { - t.Fatalf("AddProtocolAddress(1, %v) failed: %v", protoAddr, err) - } - r, err := s.FindRoute(1, header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatalf("FindRoute(1, %v, %v, %d) failed: %v", header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, err) - } - if err := verifyRoute(r, stack.Route{LocalAddress: header.IPv4Any, RemoteAddress: header.IPv4Broadcast}); err != nil { - t.Errorf("FindRoute(1, %v, %v, %d) returned unexpected Route: %v", header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, err) - } - - // If the NIC doesn't exist, it won't work. - if _, err := s.FindRoute(2, header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */); err != tcpip.ErrNetworkUnreachable { - t.Fatalf("got FindRoute(2, %v, %v, %d) = %v want = %v", header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, err, tcpip.ErrNetworkUnreachable) - } -} - -func TestOutgoingBroadcastWithRouteTable(t *testing.T) { - defaultAddr := tcpip.AddressWithPrefix{header.IPv4Any, 0} - // Local subnet on NIC1: 192.168.1.58/24, gateway 192.168.1.1. - nic1Addr := tcpip.AddressWithPrefix{"\xc0\xa8\x01\x3a", 24} - nic1Gateway := tcpip.Address("\xc0\xa8\x01\x01") - // Local subnet on NIC2: 10.10.10.5/24, gateway 10.10.10.1. - nic2Addr := tcpip.AddressWithPrefix{"\x0a\x0a\x0a\x05", 24} - nic2Gateway := tcpip.Address("\x0a\x0a\x0a\x01") - - // Create a new stack with two NICs. - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatalf("CreateNIC failed: %s", err) - } - if err := s.CreateNIC(2, ep); err != nil { - t.Fatalf("CreateNIC failed: %s", err) - } - nic1ProtoAddr := tcpip.ProtocolAddress{fakeNetNumber, nic1Addr} - if err := s.AddProtocolAddress(1, nic1ProtoAddr); err != nil { - t.Fatalf("AddProtocolAddress(1, %v) failed: %v", nic1ProtoAddr, err) - } - - nic2ProtoAddr := tcpip.ProtocolAddress{fakeNetNumber, nic2Addr} - if err := s.AddProtocolAddress(2, nic2ProtoAddr); err != nil { - t.Fatalf("AddAddress(2, %v) failed: %v", nic2ProtoAddr, err) - } - - // Set the initial route table. - rt := []tcpip.Route{ - {Destination: nic1Addr.Subnet(), NIC: 1}, - {Destination: nic2Addr.Subnet(), NIC: 2}, - {Destination: defaultAddr.Subnet(), Gateway: nic2Gateway, NIC: 2}, - {Destination: defaultAddr.Subnet(), Gateway: nic1Gateway, NIC: 1}, - } - s.SetRouteTable(rt) - - // When an interface is given, the route for a broadcast goes through it. - r, err := s.FindRoute(1, nic1Addr.Address, header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatalf("FindRoute(1, %v, %v, %d) failed: %v", nic1Addr.Address, header.IPv4Broadcast, fakeNetNumber, err) - } - if err := verifyRoute(r, stack.Route{LocalAddress: nic1Addr.Address, RemoteAddress: header.IPv4Broadcast}); err != nil { - t.Errorf("FindRoute(1, %v, %v, %d) returned unexpected Route: %v", nic1Addr.Address, header.IPv4Broadcast, fakeNetNumber, err) - } - - // When an interface is not given, it consults the route table. - // 1. Case: Using the default route. - r, err = s.FindRoute(0, "", header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatalf("FindRoute(0, \"\", %s, %d) failed: %s", header.IPv4Broadcast, fakeNetNumber, err) - } - if err := verifyRoute(r, stack.Route{LocalAddress: nic2Addr.Address, RemoteAddress: header.IPv4Broadcast}); err != nil { - t.Errorf("FindRoute(0, \"\", %s, %d) returned unexpected Route: %s)", header.IPv4Broadcast, fakeNetNumber, err) - } - - // 2. Case: Having an explicit route for broadcast will select that one. - rt = append( - []tcpip.Route{ - {Destination: tcpip.AddressWithPrefix{header.IPv4Broadcast, 8 * header.IPv4AddressSize}.Subnet(), NIC: 1}, - }, - rt..., - ) - s.SetRouteTable(rt) - r, err = s.FindRoute(0, "", header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatalf("FindRoute(0, \"\", %s, %d) failed: %s", header.IPv4Broadcast, fakeNetNumber, err) - } - if err := verifyRoute(r, stack.Route{LocalAddress: nic1Addr.Address, RemoteAddress: header.IPv4Broadcast}); err != nil { - t.Errorf("FindRoute(0, \"\", %s, %d) returned unexpected Route: %s)", header.IPv4Broadcast, fakeNetNumber, err) - } -} - -func TestMulticastOrIPv6LinkLocalNeedsNoRoute(t *testing.T) { - for _, tc := range []struct { - name string - routeNeeded bool - address tcpip.Address - }{ - // IPv4 multicast address range: 224.0.0.0 - 239.255.255.255 - // <=> 0xe0.0x00.0x00.0x00 - 0xef.0xff.0xff.0xff - {"IPv4 Multicast 1", false, "\xe0\x00\x00\x00"}, - {"IPv4 Multicast 2", false, "\xef\xff\xff\xff"}, - {"IPv4 Unicast 1", true, "\xdf\xff\xff\xff"}, - {"IPv4 Unicast 2", true, "\xf0\x00\x00\x00"}, - {"IPv4 Unicast 3", true, "\x00\x00\x00\x00"}, - - // IPv6 multicast address is 0xff[8] + flags[4] + scope[4] + groupId[112] - {"IPv6 Multicast 1", false, "\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Multicast 2", false, "\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Multicast 3", false, "\xff\x0f\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"}, - - // IPv6 link-local address starts with fe80::/10. - {"IPv6 Unicast Link-Local 1", false, "\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Link-Local 2", false, "\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"}, - {"IPv6 Unicast Link-Local 3", false, "\xfe\x80\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff"}, - {"IPv6 Unicast Link-Local 4", false, "\xfe\xbf\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Link-Local 5", false, "\xfe\xbf\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"}, - - // IPv6 addresses that are neither multicast nor link-local. - {"IPv6 Unicast Not Link-Local 1", true, "\xf0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Not Link-Local 2", true, "\xf0\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"}, - {"IPv6 Unicast Not Link-local 3", true, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Not Link-Local 4", true, "\xfe\xc0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Not Link-Local 5", true, "\xfe\xdf\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Not Link-Local 6", true, "\xfd\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - {"IPv6 Unicast Not Link-Local 7", true, "\xf0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"}, - } { - t.Run(tc.name, func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - s.SetRouteTable([]tcpip.Route{}) - - var anyAddr tcpip.Address - if len(tc.address) == header.IPv4AddressSize { - anyAddr = header.IPv4Any - } else { - anyAddr = header.IPv6Any - } - - want := tcpip.ErrNetworkUnreachable - if tc.routeNeeded { - want = tcpip.ErrNoRoute - } - - // If there is no endpoint, it won't work. - if _, err := s.FindRoute(1, anyAddr, tc.address, fakeNetNumber, false /* multicastLoop */); err != want { - t.Fatalf("got FindRoute(1, %v, %v, %v) = %v, want = %v", anyAddr, tc.address, fakeNetNumber, err, want) - } - - if err := s.AddAddress(1, fakeNetNumber, anyAddr); err != nil { - t.Fatalf("AddAddress(%v, %v) failed: %v", fakeNetNumber, anyAddr, err) - } - - if r, err := s.FindRoute(1, anyAddr, tc.address, fakeNetNumber, false /* multicastLoop */); tc.routeNeeded { - // Route table is empty but we need a route, this should cause an error. - if err != tcpip.ErrNoRoute { - t.Fatalf("got FindRoute(1, %v, %v, %v) = %v, want = %v", anyAddr, tc.address, fakeNetNumber, err, tcpip.ErrNoRoute) - } - } else { - if err != nil { - t.Fatalf("FindRoute(1, %v, %v, %v) failed: %v", anyAddr, tc.address, fakeNetNumber, err) - } - if r.LocalAddress != anyAddr { - t.Errorf("Bad local address: got %v, want = %v", r.LocalAddress, anyAddr) - } - if r.RemoteAddress != tc.address { - t.Errorf("Bad remote address: got %v, want = %v", r.RemoteAddress, tc.address) - } - } - // If the NIC doesn't exist, it won't work. - if _, err := s.FindRoute(2, anyAddr, tc.address, fakeNetNumber, false /* multicastLoop */); err != want { - t.Fatalf("got FindRoute(2, %v, %v, %v) = %v want = %v", anyAddr, tc.address, fakeNetNumber, err, want) - } - }) - } -} - -// Add a range of addresses, then check that a packet is delivered. -func TestAddressRangeAcceptsMatchingPacket(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - - buf := buffer.NewView(30) - - const localAddrByte byte = 0x01 - buf[dstAddrOffset] = localAddrByte - subnet, err := tcpip.NewSubnet(tcpip.Address("\x00"), tcpip.AddressMask("\xF0")) - if err != nil { - t.Fatal("NewSubnet failed:", err) - } - if err := s.AddAddressRange(1, fakeNetNumber, subnet); err != nil { - t.Fatal("AddAddressRange failed:", err) - } - - testRecv(t, fakeNet, localAddrByte, ep, buf) -} - -func testNicForAddressRange(t *testing.T, nicID tcpip.NICID, s *stack.Stack, subnet tcpip.Subnet, rangeExists bool) { - t.Helper() - - // Loop over all addresses and check them. - numOfAddresses := 1 << uint(8-subnet.Prefix()) - if numOfAddresses < 1 || numOfAddresses > 255 { - t.Fatalf("got numOfAddresses = %d, want = [1 .. 255] (subnet=%s)", numOfAddresses, subnet) - } - - addrBytes := []byte(subnet.ID()) - for i := 0; i < numOfAddresses; i++ { - addr := tcpip.Address(addrBytes) - wantNicID := nicID - // The subnet and broadcast addresses are skipped. - if !rangeExists || addr == subnet.ID() || addr == subnet.Broadcast() { - wantNicID = 0 - } - if gotNicID := s.CheckLocalAddress(0, fakeNetNumber, addr); gotNicID != wantNicID { - t.Errorf("got CheckLocalAddress(0, %d, %s) = %d, want = %d", fakeNetNumber, addr, gotNicID, wantNicID) - } - addrBytes[0]++ - } - - // Trying the next address should always fail since it is outside the range. - if gotNicID := s.CheckLocalAddress(0, fakeNetNumber, tcpip.Address(addrBytes)); gotNicID != 0 { - t.Errorf("got CheckLocalAddress(0, %d, %s) = %d, want = %d", fakeNetNumber, tcpip.Address(addrBytes), gotNicID, 0) - } -} - -// Set a range of addresses, then remove it again, and check at each step that -// CheckLocalAddress returns the correct NIC for each address or zero if not -// existent. -func TestCheckLocalAddressForSubnet(t *testing.T) { - const nicID tcpip.NICID = 1 - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: nicID}}) - } - - subnet, err := tcpip.NewSubnet(tcpip.Address("\xa0"), tcpip.AddressMask("\xf0")) - if err != nil { - t.Fatal("NewSubnet failed:", err) - } - - testNicForAddressRange(t, nicID, s, subnet, false /* rangeExists */) - - if err := s.AddAddressRange(nicID, fakeNetNumber, subnet); err != nil { - t.Fatal("AddAddressRange failed:", err) - } - - testNicForAddressRange(t, nicID, s, subnet, true /* rangeExists */) - - if err := s.RemoveAddressRange(nicID, subnet); err != nil { - t.Fatal("RemoveAddressRange failed:", err) - } - - testNicForAddressRange(t, nicID, s, subnet, false /* rangeExists */) -} - -// Set a range of addresses, then send a packet to a destination outside the -// range and then check it doesn't get delivered. -func TestAddressRangeRejectsNonmatchingPacket(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - - buf := buffer.NewView(30) - - const localAddrByte byte = 0x01 - buf[dstAddrOffset] = localAddrByte - subnet, err := tcpip.NewSubnet(tcpip.Address("\x10"), tcpip.AddressMask("\xF0")) - if err != nil { - t.Fatal("NewSubnet failed:", err) - } - if err := s.AddAddressRange(1, fakeNetNumber, subnet); err != nil { - t.Fatal("AddAddressRange failed:", err) - } - testFailingRecv(t, fakeNet, localAddrByte, ep, buf) -} - -func TestNetworkOptions(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - TransportProtocols: []stack.TransportProtocol{}, - }) - - // Try an unsupported network protocol. - if err := s.SetNetworkProtocolOption(tcpip.NetworkProtocolNumber(99999), fakeNetGoodOption(false)); err != tcpip.ErrUnknownProtocol { - t.Fatalf("SetNetworkProtocolOption(fakeNet2, blah, false) = %v, want = tcpip.ErrUnknownProtocol", err) - } - - testCases := []struct { - option interface{} - wantErr *tcpip.Error - verifier func(t *testing.T, p stack.NetworkProtocol) - }{ - {fakeNetGoodOption(true), nil, func(t *testing.T, p stack.NetworkProtocol) { - t.Helper() - fakeNet := p.(*fakeNetworkProtocol) - if fakeNet.opts.good != true { - t.Fatalf("fakeNet.opts.good = false, want = true") - } - var v fakeNetGoodOption - if err := s.NetworkProtocolOption(fakeNetNumber, &v); err != nil { - t.Fatalf("s.NetworkProtocolOption(fakeNetNumber, &v) = %v, want = nil, where v is option %T", v, err) - } - if v != true { - t.Fatalf("s.NetworkProtocolOption(fakeNetNumber, &v) returned v = %v, want = true", v) - } - }}, - {fakeNetBadOption(true), tcpip.ErrUnknownProtocolOption, nil}, - {fakeNetInvalidValueOption(1), tcpip.ErrInvalidOptionValue, nil}, - } - for _, tc := range testCases { - if got := s.SetNetworkProtocolOption(fakeNetNumber, tc.option); got != tc.wantErr { - t.Errorf("s.SetNetworkProtocolOption(fakeNet, %v) = %v, want = %v", tc.option, got, tc.wantErr) - } - if tc.verifier != nil { - tc.verifier(t, s.NetworkProtocolInstance(fakeNetNumber)) - } - } -} - -func stackContainsAddressRange(s *stack.Stack, id tcpip.NICID, addrRange tcpip.Subnet) bool { - ranges, ok := s.NICAddressRanges()[id] - if !ok { - return false - } - for _, r := range ranges { - if r == addrRange { - return true - } - } - return false -} - -func TestAddresRangeAddRemove(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - addr := tcpip.Address("\x01\x01\x01\x01") - mask := tcpip.AddressMask(strings.Repeat("\xff", len(addr))) - addrRange, err := tcpip.NewSubnet(addr, mask) - if err != nil { - t.Fatal("NewSubnet failed:", err) - } - - if got, want := stackContainsAddressRange(s, 1, addrRange), false; got != want { - t.Fatalf("got stackContainsAddressRange(...) = %t, want = %t", got, want) - } - - if err := s.AddAddressRange(1, fakeNetNumber, addrRange); err != nil { - t.Fatal("AddAddressRange failed:", err) - } - - if got, want := stackContainsAddressRange(s, 1, addrRange), true; got != want { - t.Fatalf("got stackContainsAddressRange(...) = %t, want = %t", got, want) - } - - if err := s.RemoveAddressRange(1, addrRange); err != nil { - t.Fatal("RemoveAddressRange failed:", err) - } - - if got, want := stackContainsAddressRange(s, 1, addrRange), false; got != want { - t.Fatalf("got stackContainsAddressRange(...) = %t, want = %t", got, want) - } -} - -func TestGetMainNICAddressAddPrimaryNonPrimary(t *testing.T) { - for _, addrLen := range []int{4, 16} { - t.Run(fmt.Sprintf("addrLen=%d", addrLen), func(t *testing.T) { - for canBe := 0; canBe < 3; canBe++ { - t.Run(fmt.Sprintf("canBe=%d", canBe), func(t *testing.T) { - for never := 0; never < 3; never++ { - t.Run(fmt.Sprintf("never=%d", never), func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - // Insert <canBe> primary and <never> never-primary addresses. - // Each one will add a network endpoint to the NIC. - primaryAddrAdded := make(map[tcpip.AddressWithPrefix]struct{}) - for i := 0; i < canBe+never; i++ { - var behavior stack.PrimaryEndpointBehavior - if i < canBe { - behavior = stack.CanBePrimaryEndpoint - } else { - behavior = stack.NeverPrimaryEndpoint - } - // Add an address and in case of a primary one include a - // prefixLen. - address := tcpip.Address(bytes.Repeat([]byte{byte(i)}, addrLen)) - if behavior == stack.CanBePrimaryEndpoint { - protocolAddress := tcpip.ProtocolAddress{ - Protocol: fakeNetNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: address, - PrefixLen: addrLen * 8, - }, - } - if err := s.AddProtocolAddressWithOptions(1, protocolAddress, behavior); err != nil { - t.Fatal("AddProtocolAddressWithOptions failed:", err) - } - // Remember the address/prefix. - primaryAddrAdded[protocolAddress.AddressWithPrefix] = struct{}{} - } else { - if err := s.AddAddressWithOptions(1, fakeNetNumber, address, behavior); err != nil { - t.Fatal("AddAddressWithOptions failed:", err) - } - } - } - // Check that GetMainNICAddress returns an address if at least - // one primary address was added. In that case make sure the - // address/prefixLen matches what we added. - gotAddr, err := s.GetMainNICAddress(1, fakeNetNumber) - if err != nil { - t.Fatal("GetMainNICAddress failed:", err) - } - if len(primaryAddrAdded) == 0 { - // No primary addresses present. - if wantAddr := (tcpip.AddressWithPrefix{}); gotAddr != wantAddr { - t.Fatalf("GetMainNICAddress: got addr = %s, want = %s", gotAddr, wantAddr) - } - } else { - // At least one primary address was added, verify the returned - // address is in the list of primary addresses we added. - if _, ok := primaryAddrAdded[gotAddr]; !ok { - t.Fatalf("GetMainNICAddress: got = %s, want any in {%v}", gotAddr, primaryAddrAdded) - } - } - }) - } - }) - } - }) - } -} - -func TestGetMainNICAddressAddRemove(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - for _, tc := range []struct { - name string - address tcpip.Address - prefixLen int - }{ - {"IPv4", "\x01\x01\x01\x01", 24}, - {"IPv6", "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01", 116}, - } { - t.Run(tc.name, func(t *testing.T) { - protocolAddress := tcpip.ProtocolAddress{ - Protocol: fakeNetNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: tc.address, - PrefixLen: tc.prefixLen, - }, - } - if err := s.AddProtocolAddress(1, protocolAddress); err != nil { - t.Fatal("AddProtocolAddress failed:", err) - } - - // Check that we get the right initial address and prefix length. - gotAddr, err := s.GetMainNICAddress(1, fakeNetNumber) - if err != nil { - t.Fatal("GetMainNICAddress failed:", err) - } - if wantAddr := protocolAddress.AddressWithPrefix; gotAddr != wantAddr { - t.Fatalf("got s.GetMainNICAddress(...) = %s, want = %s", gotAddr, wantAddr) - } - - if err := s.RemoveAddress(1, protocolAddress.AddressWithPrefix.Address); err != nil { - t.Fatal("RemoveAddress failed:", err) - } - - // Check that we get no address after removal. - gotAddr, err = s.GetMainNICAddress(1, fakeNetNumber) - if err != nil { - t.Fatal("GetMainNICAddress failed:", err) - } - if wantAddr := (tcpip.AddressWithPrefix{}); gotAddr != wantAddr { - t.Fatalf("got GetMainNICAddress(...) = %s, want = %s", gotAddr, wantAddr) - } - }) - } -} - -// Simple network address generator. Good for 255 addresses. -type addressGenerator struct{ cnt byte } - -func (g *addressGenerator) next(addrLen int) tcpip.Address { - g.cnt++ - return tcpip.Address(bytes.Repeat([]byte{g.cnt}, addrLen)) -} - -func verifyAddresses(t *testing.T, expectedAddresses, gotAddresses []tcpip.ProtocolAddress) { - t.Helper() - - if len(gotAddresses) != len(expectedAddresses) { - t.Fatalf("got len(addresses) = %d, want = %d", len(gotAddresses), len(expectedAddresses)) - } - - sort.Slice(gotAddresses, func(i, j int) bool { - return gotAddresses[i].AddressWithPrefix.Address < gotAddresses[j].AddressWithPrefix.Address - }) - sort.Slice(expectedAddresses, func(i, j int) bool { - return expectedAddresses[i].AddressWithPrefix.Address < expectedAddresses[j].AddressWithPrefix.Address - }) - - for i, gotAddr := range gotAddresses { - expectedAddr := expectedAddresses[i] - if gotAddr != expectedAddr { - t.Errorf("got address = %+v, wanted = %+v", gotAddr, expectedAddr) - } - } -} - -func TestAddAddress(t *testing.T) { - const nicID = 1 - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - var addrGen addressGenerator - expectedAddresses := make([]tcpip.ProtocolAddress, 0, 2) - for _, addrLen := range []int{4, 16} { - address := addrGen.next(addrLen) - if err := s.AddAddress(nicID, fakeNetNumber, address); err != nil { - t.Fatalf("AddAddress(address=%s) failed: %s", address, err) - } - expectedAddresses = append(expectedAddresses, tcpip.ProtocolAddress{ - Protocol: fakeNetNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{address, fakeDefaultPrefixLen}, - }) - } - - gotAddresses := s.AllAddresses()[nicID] - verifyAddresses(t, expectedAddresses, gotAddresses) -} - -func TestAddProtocolAddress(t *testing.T) { - const nicID = 1 - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - var addrGen addressGenerator - addrLenRange := []int{4, 16} - prefixLenRange := []int{8, 13, 20, 32} - expectedAddresses := make([]tcpip.ProtocolAddress, 0, len(addrLenRange)*len(prefixLenRange)) - for _, addrLen := range addrLenRange { - for _, prefixLen := range prefixLenRange { - protocolAddress := tcpip.ProtocolAddress{ - Protocol: fakeNetNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: addrGen.next(addrLen), - PrefixLen: prefixLen, - }, - } - if err := s.AddProtocolAddress(nicID, protocolAddress); err != nil { - t.Errorf("AddProtocolAddress(%+v) failed: %s", protocolAddress, err) - } - expectedAddresses = append(expectedAddresses, protocolAddress) - } - } - - gotAddresses := s.AllAddresses()[nicID] - verifyAddresses(t, expectedAddresses, gotAddresses) -} - -func TestAddAddressWithOptions(t *testing.T) { - const nicID = 1 - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - addrLenRange := []int{4, 16} - behaviorRange := []stack.PrimaryEndpointBehavior{stack.CanBePrimaryEndpoint, stack.FirstPrimaryEndpoint, stack.NeverPrimaryEndpoint} - expectedAddresses := make([]tcpip.ProtocolAddress, 0, len(addrLenRange)*len(behaviorRange)) - var addrGen addressGenerator - for _, addrLen := range addrLenRange { - for _, behavior := range behaviorRange { - address := addrGen.next(addrLen) - if err := s.AddAddressWithOptions(nicID, fakeNetNumber, address, behavior); err != nil { - t.Fatalf("AddAddressWithOptions(address=%s, behavior=%d) failed: %s", address, behavior, err) - } - expectedAddresses = append(expectedAddresses, tcpip.ProtocolAddress{ - Protocol: fakeNetNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{address, fakeDefaultPrefixLen}, - }) - } - } - - gotAddresses := s.AllAddresses()[nicID] - verifyAddresses(t, expectedAddresses, gotAddresses) -} - -func TestAddProtocolAddressWithOptions(t *testing.T) { - const nicID = 1 - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID, ep); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - addrLenRange := []int{4, 16} - prefixLenRange := []int{8, 13, 20, 32} - behaviorRange := []stack.PrimaryEndpointBehavior{stack.CanBePrimaryEndpoint, stack.FirstPrimaryEndpoint, stack.NeverPrimaryEndpoint} - expectedAddresses := make([]tcpip.ProtocolAddress, 0, len(addrLenRange)*len(prefixLenRange)*len(behaviorRange)) - var addrGen addressGenerator - for _, addrLen := range addrLenRange { - for _, prefixLen := range prefixLenRange { - for _, behavior := range behaviorRange { - protocolAddress := tcpip.ProtocolAddress{ - Protocol: fakeNetNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: addrGen.next(addrLen), - PrefixLen: prefixLen, - }, - } - if err := s.AddProtocolAddressWithOptions(nicID, protocolAddress, behavior); err != nil { - t.Fatalf("AddProtocolAddressWithOptions(%+v, %d) failed: %s", protocolAddress, behavior, err) - } - expectedAddresses = append(expectedAddresses, protocolAddress) - } - } - } - - gotAddresses := s.AllAddresses()[nicID] - verifyAddresses(t, expectedAddresses, gotAddresses) -} - -func TestCreateNICWithOptions(t *testing.T) { - type callArgsAndExpect struct { - nicID tcpip.NICID - opts stack.NICOptions - err *tcpip.Error - } - - tests := []struct { - desc string - calls []callArgsAndExpect - }{ - { - desc: "DuplicateNICID", - calls: []callArgsAndExpect{ - { - nicID: tcpip.NICID(1), - opts: stack.NICOptions{Name: "eth1"}, - err: nil, - }, - { - nicID: tcpip.NICID(1), - opts: stack.NICOptions{Name: "eth2"}, - err: tcpip.ErrDuplicateNICID, - }, - }, - }, - { - desc: "DuplicateName", - calls: []callArgsAndExpect{ - { - nicID: tcpip.NICID(1), - opts: stack.NICOptions{Name: "lo"}, - err: nil, - }, - { - nicID: tcpip.NICID(2), - opts: stack.NICOptions{Name: "lo"}, - err: tcpip.ErrDuplicateNICID, - }, - }, - }, - { - desc: "Unnamed", - calls: []callArgsAndExpect{ - { - nicID: tcpip.NICID(1), - opts: stack.NICOptions{}, - err: nil, - }, - { - nicID: tcpip.NICID(2), - opts: stack.NICOptions{}, - err: nil, - }, - }, - }, - { - desc: "UnnamedDuplicateNICID", - calls: []callArgsAndExpect{ - { - nicID: tcpip.NICID(1), - opts: stack.NICOptions{}, - err: nil, - }, - { - nicID: tcpip.NICID(1), - opts: stack.NICOptions{}, - err: tcpip.ErrDuplicateNICID, - }, - }, - }, - } - for _, test := range tests { - t.Run(test.desc, func(t *testing.T) { - s := stack.New(stack.Options{}) - ep := channel.New(0, 0, tcpip.LinkAddress("\x00\x00\x00\x00\x00\x00")) - for _, call := range test.calls { - if got, want := s.CreateNICWithOptions(call.nicID, ep, call.opts), call.err; got != want { - t.Fatalf("CreateNICWithOptions(%v, _, %+v) = %v, want %v", call.nicID, call.opts, got, want) - } - } - }) - } -} - -func TestNICStats(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep1 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep1); err != nil { - t.Fatal("CreateNIC failed: ", err) - } - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatal("AddAddress failed:", err) - } - // Route all packets for address \x01 to NIC 1. - { - subnet, err := tcpip.NewSubnet("\x01", "\xff") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - // Send a packet to address 1. - buf := buffer.NewView(30) - ep1.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if got, want := s.NICInfo()[1].Stats.Rx.Packets.Value(), uint64(1); got != want { - t.Errorf("got Rx.Packets.Value() = %d, want = %d", got, want) - } - - if got, want := s.NICInfo()[1].Stats.Rx.Bytes.Value(), uint64(len(buf)); got != want { - t.Errorf("got Rx.Bytes.Value() = %d, want = %d", got, want) - } - - payload := buffer.NewView(10) - // Write a packet out via the address for NIC 1 - if err := sendTo(s, "\x01", payload); err != nil { - t.Fatal("sendTo failed: ", err) - } - want := uint64(ep1.Drain()) - if got := s.NICInfo()[1].Stats.Tx.Packets.Value(); got != want { - t.Errorf("got Tx.Packets.Value() = %d, ep1.Drain() = %d", got, want) - } - - if got, want := s.NICInfo()[1].Stats.Tx.Bytes.Value(), uint64(len(payload)); got != want { - t.Errorf("got Tx.Bytes.Value() = %d, want = %d", got, want) - } -} - -func TestNICForwarding(t *testing.T) { - const nicID1 = 1 - const nicID2 = 2 - const dstAddr = tcpip.Address("\x03") - - tests := []struct { - name string - headerLen uint16 - }{ - { - name: "Zero header length", - }, - { - name: "Non-zero header length", - headerLen: 16, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - s.SetForwarding(true) - - ep1 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(nicID1, ep1); err != nil { - t.Fatalf("CreateNIC(%d, _): %s", nicID1, err) - } - if err := s.AddAddress(nicID1, fakeNetNumber, "\x01"); err != nil { - t.Fatalf("AddAddress(%d, %d, 0x01): %s", nicID1, fakeNetNumber, err) - } - - ep2 := channelLinkWithHeaderLength{ - Endpoint: channel.New(10, defaultMTU, ""), - headerLength: test.headerLen, - } - if err := s.CreateNIC(nicID2, &ep2); err != nil { - t.Fatalf("CreateNIC(%d, _): %s", nicID2, err) - } - if err := s.AddAddress(nicID2, fakeNetNumber, "\x02"); err != nil { - t.Fatalf("AddAddress(%d, %d, 0x02): %s", nicID2, fakeNetNumber, err) - } - - // Route all packets to dstAddr to NIC 2. - { - subnet, err := tcpip.NewSubnet(dstAddr, "\xff") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: nicID2}}) - } - - // Send a packet to dstAddr. - buf := buffer.NewView(30) - buf[dstAddrOffset] = dstAddr[0] - ep1.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - - pkt, ok := ep2.Read() - if !ok { - t.Fatal("packet not forwarded") - } - - // Test that the link's MaxHeaderLength is honoured. - if capacity, want := pkt.Pkt.Header.AvailableLength(), int(test.headerLen); capacity != want { - t.Errorf("got Header.AvailableLength() = %d, want = %d", capacity, want) - } - - // Test that forwarding increments Tx stats correctly. - if got, want := s.NICInfo()[nicID2].Stats.Tx.Packets.Value(), uint64(1); got != want { - t.Errorf("got Tx.Packets.Value() = %d, want = %d", got, want) - } - - if got, want := s.NICInfo()[nicID2].Stats.Tx.Bytes.Value(), uint64(len(buf)); got != want { - t.Errorf("got Tx.Bytes.Value() = %d, want = %d", got, want) - } - }) - } -} - -// TestNICContextPreservation tests that you can read out via stack.NICInfo the -// Context data you pass via NICContext.Context in stack.CreateNICWithOptions. -func TestNICContextPreservation(t *testing.T) { - var ctx *int - tests := []struct { - name string - opts stack.NICOptions - want stack.NICContext - }{ - { - "context_set", - stack.NICOptions{Context: ctx}, - ctx, - }, - { - "context_not_set", - stack.NICOptions{}, - nil, - }, - } - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - s := stack.New(stack.Options{}) - id := tcpip.NICID(1) - ep := channel.New(0, 0, tcpip.LinkAddress("\x00\x00\x00\x00\x00\x00")) - if err := s.CreateNICWithOptions(id, ep, test.opts); err != nil { - t.Fatalf("got stack.CreateNICWithOptions(%d, %+v, %+v) = %s, want nil", id, ep, test.opts, err) - } - nicinfos := s.NICInfo() - nicinfo, ok := nicinfos[id] - if !ok { - t.Fatalf("got nicinfos[%d] = _, %t, want _, true; nicinfos = %+v", id, ok, nicinfos) - } - if got, want := nicinfo.Context == test.want, true; got != want { - t.Fatalf("got nicinfo.Context == ctx = %t, want %t; nicinfo.Context = %p, ctx = %p", got, want, nicinfo.Context, test.want) - } - }) - } -} - -// TestNICAutoGenLinkLocalAddr tests the auto-generation of IPv6 link-local -// addresses. -func TestNICAutoGenLinkLocalAddr(t *testing.T) { - const nicID = 1 - - var secretKey [header.OpaqueIIDSecretKeyMinBytes]byte - n, err := rand.Read(secretKey[:]) - if err != nil { - t.Fatalf("rand.Read(_): %s", err) - } - if n != header.OpaqueIIDSecretKeyMinBytes { - t.Fatalf("expected rand.Read to read %d bytes, read %d bytes", header.OpaqueIIDSecretKeyMinBytes, n) - } - - nicNameFunc := func(_ tcpip.NICID, name string) string { - return name - } - - tests := []struct { - name string - nicName string - autoGen bool - linkAddr tcpip.LinkAddress - iidOpts stack.OpaqueInterfaceIdentifierOptions - shouldGen bool - expectedAddr tcpip.Address - }{ - { - name: "Disabled", - nicName: "nic1", - autoGen: false, - linkAddr: linkAddr1, - shouldGen: false, - }, - { - name: "Disabled without OIID options", - nicName: "nic1", - autoGen: false, - linkAddr: linkAddr1, - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: nicNameFunc, - SecretKey: secretKey[:], - }, - shouldGen: false, - }, - - // Tests for EUI64 based addresses. - { - name: "EUI64 Enabled", - autoGen: true, - linkAddr: linkAddr1, - shouldGen: true, - expectedAddr: header.LinkLocalAddr(linkAddr1), - }, - { - name: "EUI64 Empty MAC", - autoGen: true, - shouldGen: false, - }, - { - name: "EUI64 Invalid MAC", - autoGen: true, - linkAddr: "\x01\x02\x03", - shouldGen: false, - }, - { - name: "EUI64 Multicast MAC", - autoGen: true, - linkAddr: "\x01\x02\x03\x04\x05\x06", - shouldGen: false, - }, - { - name: "EUI64 Unspecified MAC", - autoGen: true, - linkAddr: "\x00\x00\x00\x00\x00\x00", - shouldGen: false, - }, - - // Tests for Opaque IID based addresses. - { - name: "OIID Enabled", - nicName: "nic1", - autoGen: true, - linkAddr: linkAddr1, - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: nicNameFunc, - SecretKey: secretKey[:], - }, - shouldGen: true, - expectedAddr: header.LinkLocalAddrWithOpaqueIID("nic1", 0, secretKey[:]), - }, - // These are all cases where we would not have generated a - // link-local address if opaque IIDs were disabled. - { - name: "OIID Empty MAC and empty nicName", - autoGen: true, - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: nicNameFunc, - SecretKey: secretKey[:1], - }, - shouldGen: true, - expectedAddr: header.LinkLocalAddrWithOpaqueIID("", 0, secretKey[:1]), - }, - { - name: "OIID Invalid MAC", - nicName: "test", - autoGen: true, - linkAddr: "\x01\x02\x03", - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: nicNameFunc, - SecretKey: secretKey[:2], - }, - shouldGen: true, - expectedAddr: header.LinkLocalAddrWithOpaqueIID("test", 0, secretKey[:2]), - }, - { - name: "OIID Multicast MAC", - nicName: "test2", - autoGen: true, - linkAddr: "\x01\x02\x03\x04\x05\x06", - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: nicNameFunc, - SecretKey: secretKey[:3], - }, - shouldGen: true, - expectedAddr: header.LinkLocalAddrWithOpaqueIID("test2", 0, secretKey[:3]), - }, - { - name: "OIID Unspecified MAC and nil SecretKey", - nicName: "test3", - autoGen: true, - linkAddr: "\x00\x00\x00\x00\x00\x00", - iidOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: nicNameFunc, - }, - shouldGen: true, - expectedAddr: header.LinkLocalAddrWithOpaqueIID("test3", 0, nil), - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - ndpDisp := ndpDispatcher{ - autoGenAddrC: make(chan ndpAutoGenAddrEvent, 1), - } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - AutoGenIPv6LinkLocal: test.autoGen, - NDPDisp: &ndpDisp, - OpaqueIIDOpts: test.iidOpts, - } - - e := channel.New(0, 1280, test.linkAddr) - s := stack.New(opts) - nicOpts := stack.NICOptions{Name: test.nicName, Disabled: true} - if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, opts, err) - } - - // A new disabled NIC should not have any address, even if auto generation - // was enabled. - allStackAddrs := s.AllAddresses() - allNICAddrs, ok := allStackAddrs[nicID] - if !ok { - t.Fatalf("entry for %d missing from allStackAddrs = %+v", nicID, allStackAddrs) - } - if l := len(allNICAddrs); l != 0 { - t.Fatalf("got len(allNICAddrs) = %d, want = 0", l) - } - - // Enabling the NIC should attempt auto-generation of a link-local - // address. - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - - var expectedMainAddr tcpip.AddressWithPrefix - if test.shouldGen { - expectedMainAddr = tcpip.AddressWithPrefix{ - Address: test.expectedAddr, - PrefixLen: header.IPv6LinkLocalPrefix.PrefixLen, - } - - // Should have auto-generated an address and resolved immediately (DAD - // is disabled). - select { - case e := <-ndpDisp.autoGenAddrC: - if diff := checkAutoGenAddrEvent(e, expectedMainAddr, newAddr); diff != "" { - t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff) - } - default: - t.Fatal("expected addr auto gen event") - } - } else { - // Should not have auto-generated an address. - select { - case <-ndpDisp.autoGenAddrC: - t.Fatal("unexpectedly auto-generated an address") - default: - } - } - - gotMainAddr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err) - } - if gotMainAddr != expectedMainAddr { - t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", gotMainAddr, expectedMainAddr) - } - }) - } -} - -// TestNoLinkLocalAutoGenForLoopbackNIC tests that IPv6 link-local addresses are -// not auto-generated for loopback NICs. -func TestNoLinkLocalAutoGenForLoopbackNIC(t *testing.T) { - const nicID = 1 - const nicName = "nicName" - - tests := []struct { - name string - opaqueIIDOpts stack.OpaqueInterfaceIdentifierOptions - }{ - { - name: "IID From MAC", - opaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{}, - }, - { - name: "Opaque IID", - opaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{ - NICNameFromID: func(_ tcpip.NICID, nicName string) string { - return nicName - }, - }, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - AutoGenIPv6LinkLocal: true, - OpaqueIIDOpts: test.opaqueIIDOpts, - } - - e := loopback.New() - s := stack.New(opts) - nicOpts := stack.NICOptions{Name: nicName} - if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil { - t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, nicOpts, err) - } - - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(%d, _) err = %s", nicID, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Errorf("got stack.GetMainNICAddress(%d, _) = %s, want = %s", nicID, addr, want) - } - }) - } -} - -// TestNICAutoGenAddrDoesDAD tests that the successful auto-generation of IPv6 -// link-local addresses will only be assigned after the DAD process resolves. -func TestNICAutoGenAddrDoesDAD(t *testing.T) { - const nicID = 1 - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent), - } - ndpConfigs := stack.DefaultNDPConfigurations() - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: ndpConfigs, - AutoGenIPv6LinkLocal: true, - NDPDisp: &ndpDisp, - } - - e := channel.New(int(ndpConfigs.DupAddrDetectTransmits), 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - - // Address should not be considered bound to the - // NIC yet (DAD ongoing). - addr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } - - linkLocalAddr := header.LinkLocalAddr(linkAddr1) - - // Wait for DAD to resolve. - select { - case <-time.After(time.Duration(ndpConfigs.DupAddrDetectTransmits)*ndpConfigs.RetransmitTimer + time.Second): - // We should get a resolution event after 1s (default time to - // resolve as per default NDP configurations). Waiting for that - // resolution time + an extra 1s without a resolution event - // means something is wrong. - t.Fatal("timed out waiting for DAD resolution") - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, linkLocalAddr, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - } - addr, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{Address: linkLocalAddr, PrefixLen: header.IPv6LinkLocalPrefix.PrefixLen}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want) - } -} - -// TestNewPEB tests that a new PrimaryEndpointBehavior value (peb) is respected -// when an address's kind gets "promoted" to permanent from permanentExpired. -func TestNewPEBOnPromotionToPermanent(t *testing.T) { - pebs := []stack.PrimaryEndpointBehavior{ - stack.NeverPrimaryEndpoint, - stack.CanBePrimaryEndpoint, - stack.FirstPrimaryEndpoint, - } - - for _, pi := range pebs { - for _, ps := range pebs { - t.Run(fmt.Sprintf("%d-to-%d", pi, ps), func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - ep1 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep1); err != nil { - t.Fatal("CreateNIC failed:", err) - } - - // Add a permanent address with initial - // PrimaryEndpointBehavior (peb), pi. If pi is - // NeverPrimaryEndpoint, the address should not - // be returned by a call to GetMainNICAddress; - // else, it should. - if err := s.AddAddressWithOptions(1, fakeNetNumber, "\x01", pi); err != nil { - t.Fatal("AddAddressWithOptions failed:", err) - } - addr, err := s.GetMainNICAddress(1, fakeNetNumber) - if err != nil { - t.Fatal("s.GetMainNICAddress failed:", err) - } - if pi == stack.NeverPrimaryEndpoint { - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got GetMainNICAddress = %s, want = %s", addr, want) - - } - } else if addr.Address != "\x01" { - t.Fatalf("got GetMainNICAddress = %s, want = 1", addr.Address) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatalf("NewSubnet failed: %v", err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - // Take a route through the address so its ref - // count gets incremented and does not actually - // get deleted when RemoveAddress is called - // below. This is because we want to test that a - // new peb is respected when an address gets - // "promoted" to permanent from a - // permanentExpired kind. - r, err := s.FindRoute(1, "\x01", "\x02", fakeNetNumber, false) - if err != nil { - t.Fatalf("FindRoute failed: %v", err) - } - defer r.Release() - if err := s.RemoveAddress(1, "\x01"); err != nil { - t.Fatalf("RemoveAddress failed: %v", err) - } - - // - // At this point, the address should still be - // known by the NIC, but have its - // kind = permanentExpired. - // - - // Add some other address with peb set to - // FirstPrimaryEndpoint. - if err := s.AddAddressWithOptions(1, fakeNetNumber, "\x03", stack.FirstPrimaryEndpoint); err != nil { - t.Fatalf("AddAddressWithOptions failed: %v", err) - - } - - // Add back the address we removed earlier and - // make sure the new peb was respected. - // (The address should just be promoted now). - if err := s.AddAddressWithOptions(1, fakeNetNumber, "\x01", ps); err != nil { - t.Fatalf("AddAddressWithOptions failed: %v", err) - } - var primaryAddrs []tcpip.Address - for _, pa := range s.NICInfo()[1].ProtocolAddresses { - primaryAddrs = append(primaryAddrs, pa.AddressWithPrefix.Address) - } - var expectedList []tcpip.Address - switch ps { - case stack.FirstPrimaryEndpoint: - expectedList = []tcpip.Address{ - "\x01", - "\x03", - } - case stack.CanBePrimaryEndpoint: - expectedList = []tcpip.Address{ - "\x03", - "\x01", - } - case stack.NeverPrimaryEndpoint: - expectedList = []tcpip.Address{ - "\x03", - } - } - if !cmp.Equal(primaryAddrs, expectedList) { - t.Fatalf("got NIC's primary addresses = %v, want = %v", primaryAddrs, expectedList) - } - - // Once we remove the other address, if the new - // peb, ps, was NeverPrimaryEndpoint, no address - // should be returned by a call to - // GetMainNICAddress; else, our original address - // should be returned. - if err := s.RemoveAddress(1, "\x03"); err != nil { - t.Fatalf("RemoveAddress failed: %v", err) - } - addr, err = s.GetMainNICAddress(1, fakeNetNumber) - if err != nil { - t.Fatalf("s.GetMainNICAddress failed: %v", err) - } - if ps == stack.NeverPrimaryEndpoint { - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got GetMainNICAddress = %s, want = %s", addr, want) - - } - } else { - if addr.Address != "\x01" { - t.Fatalf("got GetMainNICAddress = %s, want = 1", addr.Address) - } - } - }) - } - } -} - -func TestIPv6SourceAddressSelectionScopeAndSameAddress(t *testing.T) { - const ( - linkLocalAddr1 = tcpip.Address("\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01") - linkLocalAddr2 = tcpip.Address("\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02") - linkLocalMulticastAddr = tcpip.Address("\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01") - uniqueLocalAddr1 = tcpip.Address("\xfc\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01") - uniqueLocalAddr2 = tcpip.Address("\xfd\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02") - globalAddr1 = tcpip.Address("\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01") - globalAddr2 = tcpip.Address("\xa0\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02") - nicID = 1 - lifetimeSeconds = 9999 - ) - - prefix1, _, stableGlobalAddr1 := prefixSubnetAddr(0, linkAddr1) - prefix2, _, stableGlobalAddr2 := prefixSubnetAddr(1, linkAddr1) - - var tempIIDHistory [header.IIDSize]byte - header.InitialTempIID(tempIIDHistory[:], nil, nicID) - tempGlobalAddr1 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], stableGlobalAddr1.Address).Address - tempGlobalAddr2 := header.GenerateTempIPv6SLAACAddr(tempIIDHistory[:], stableGlobalAddr2.Address).Address - - // Rule 3 is not tested here, and is instead tested by NDP's AutoGenAddr test. - tests := []struct { - name string - slaacPrefixForTempAddrBeforeNICAddrAdd tcpip.AddressWithPrefix - nicAddrs []tcpip.Address - slaacPrefixForTempAddrAfterNICAddrAdd tcpip.AddressWithPrefix - connectAddr tcpip.Address - expectedLocalAddr tcpip.Address - }{ - // Test Rule 1 of RFC 6724 section 5. - { - name: "Same Global most preferred (last address)", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - connectAddr: globalAddr1, - expectedLocalAddr: globalAddr1, - }, - { - name: "Same Global most preferred (first address)", - nicAddrs: []tcpip.Address{globalAddr1, linkLocalAddr1, uniqueLocalAddr1}, - connectAddr: globalAddr1, - expectedLocalAddr: globalAddr1, - }, - { - name: "Same Link Local most preferred (last address)", - nicAddrs: []tcpip.Address{globalAddr1, uniqueLocalAddr1, linkLocalAddr1}, - connectAddr: linkLocalAddr1, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Same Link Local most preferred (first address)", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - connectAddr: linkLocalAddr1, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Same Unique Local most preferred (last address)", - nicAddrs: []tcpip.Address{uniqueLocalAddr1, globalAddr1, linkLocalAddr1}, - connectAddr: uniqueLocalAddr1, - expectedLocalAddr: uniqueLocalAddr1, - }, - { - name: "Same Unique Local most preferred (first address)", - nicAddrs: []tcpip.Address{globalAddr1, linkLocalAddr1, uniqueLocalAddr1}, - connectAddr: uniqueLocalAddr1, - expectedLocalAddr: uniqueLocalAddr1, - }, - - // Test Rule 2 of RFC 6724 section 5. - { - name: "Global most preferred (last address)", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - connectAddr: globalAddr2, - expectedLocalAddr: globalAddr1, - }, - { - name: "Global most preferred (first address)", - nicAddrs: []tcpip.Address{globalAddr1, linkLocalAddr1, uniqueLocalAddr1}, - connectAddr: globalAddr2, - expectedLocalAddr: globalAddr1, - }, - { - name: "Link Local most preferred (last address)", - nicAddrs: []tcpip.Address{globalAddr1, uniqueLocalAddr1, linkLocalAddr1}, - connectAddr: linkLocalAddr2, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Link Local most preferred (first address)", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - connectAddr: linkLocalAddr2, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Link Local most preferred for link local multicast (last address)", - nicAddrs: []tcpip.Address{globalAddr1, uniqueLocalAddr1, linkLocalAddr1}, - connectAddr: linkLocalMulticastAddr, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Link Local most preferred for link local multicast (first address)", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - connectAddr: linkLocalMulticastAddr, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Unique Local most preferred (last address)", - nicAddrs: []tcpip.Address{uniqueLocalAddr1, globalAddr1, linkLocalAddr1}, - connectAddr: uniqueLocalAddr2, - expectedLocalAddr: uniqueLocalAddr1, - }, - { - name: "Unique Local most preferred (first address)", - nicAddrs: []tcpip.Address{globalAddr1, linkLocalAddr1, uniqueLocalAddr1}, - connectAddr: uniqueLocalAddr2, - expectedLocalAddr: uniqueLocalAddr1, - }, - - // Test Rule 7 of RFC 6724 section 5. - { - name: "Temp Global most preferred (last address)", - slaacPrefixForTempAddrBeforeNICAddrAdd: prefix1, - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - connectAddr: globalAddr2, - expectedLocalAddr: tempGlobalAddr1, - }, - { - name: "Temp Global most preferred (first address)", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, globalAddr1}, - slaacPrefixForTempAddrAfterNICAddrAdd: prefix1, - connectAddr: globalAddr2, - expectedLocalAddr: tempGlobalAddr1, - }, - - // Test returning the endpoint that is closest to the front when - // candidate addresses are "equal" from the perspective of RFC 6724 - // section 5. - { - name: "Unique Local for Global", - nicAddrs: []tcpip.Address{linkLocalAddr1, uniqueLocalAddr1, uniqueLocalAddr2}, - connectAddr: globalAddr2, - expectedLocalAddr: uniqueLocalAddr1, - }, - { - name: "Link Local for Global", - nicAddrs: []tcpip.Address{linkLocalAddr1, linkLocalAddr2}, - connectAddr: globalAddr2, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Link Local for Unique Local", - nicAddrs: []tcpip.Address{linkLocalAddr1, linkLocalAddr2}, - connectAddr: uniqueLocalAddr2, - expectedLocalAddr: linkLocalAddr1, - }, - { - name: "Temp Global for Global", - slaacPrefixForTempAddrBeforeNICAddrAdd: prefix1, - slaacPrefixForTempAddrAfterNICAddrAdd: prefix2, - connectAddr: globalAddr1, - expectedLocalAddr: tempGlobalAddr2, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - e := channel.New(0, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - HandleRAs: true, - AutoGenGlobalAddresses: true, - AutoGenTempGlobalAddresses: true, - }, - NDPDisp: &ndpDispatcher{}, - }) - if err := s.CreateNIC(nicID, e); err != nil { - t.Fatalf("CreateNIC(%d, _) = %s", nicID, err) - } - s.SetRouteTable([]tcpip.Route{{ - Destination: header.IPv6EmptySubnet, - Gateway: llAddr3, - NIC: nicID, - }}) - s.AddLinkAddress(nicID, llAddr3, linkAddr3) - - if test.slaacPrefixForTempAddrBeforeNICAddrAdd != (tcpip.AddressWithPrefix{}) { - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, 0, test.slaacPrefixForTempAddrBeforeNICAddrAdd, true, true, lifetimeSeconds, lifetimeSeconds)) - } - - for _, a := range test.nicAddrs { - if err := s.AddAddress(nicID, ipv6.ProtocolNumber, a); err != nil { - t.Errorf("s.AddAddress(%d, %d, %s): %s", nicID, ipv6.ProtocolNumber, a, err) - } - } - - if test.slaacPrefixForTempAddrAfterNICAddrAdd != (tcpip.AddressWithPrefix{}) { - e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr3, 0, test.slaacPrefixForTempAddrAfterNICAddrAdd, true, true, lifetimeSeconds, lifetimeSeconds)) - } - - if t.Failed() { - t.FailNow() - } - - if got := addrForNewConnectionTo(t, s, tcpip.FullAddress{Addr: test.connectAddr, NIC: nicID, Port: 1234}); got != test.expectedLocalAddr { - t.Errorf("got local address = %s, want = %s", got, test.expectedLocalAddr) - } - }) - } -} - -func TestAddRemoveIPv4BroadcastAddressOnNICEnableDisable(t *testing.T) { - const nicID = 1 - - e := loopback.New() - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol()}, - }) - nicOpts := stack.NICOptions{Disabled: true} - if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil { - t.Fatalf("CreateNIC(%d, _, %+v) = %s", nicID, nicOpts, err) - } - - allStackAddrs := s.AllAddresses() - allNICAddrs, ok := allStackAddrs[nicID] - if !ok { - t.Fatalf("entry for %d missing from allStackAddrs = %+v", nicID, allStackAddrs) - } - if l := len(allNICAddrs); l != 0 { - t.Fatalf("got len(allNICAddrs) = %d, want = 0", l) - } - - // Enabling the NIC should add the IPv4 broadcast address. - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - allStackAddrs = s.AllAddresses() - allNICAddrs, ok = allStackAddrs[nicID] - if !ok { - t.Fatalf("entry for %d missing from allStackAddrs = %+v", nicID, allStackAddrs) - } - if l := len(allNICAddrs); l != 1 { - t.Fatalf("got len(allNICAddrs) = %d, want = 1", l) - } - want := tcpip.ProtocolAddress{ - Protocol: header.IPv4ProtocolNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: header.IPv4Broadcast, - PrefixLen: 32, - }, - } - if allNICAddrs[0] != want { - t.Fatalf("got allNICAddrs[0] = %+v, want = %+v", allNICAddrs[0], want) - } - - // Disabling the NIC should remove the IPv4 broadcast address. - if err := s.DisableNIC(nicID); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID, err) - } - allStackAddrs = s.AllAddresses() - allNICAddrs, ok = allStackAddrs[nicID] - if !ok { - t.Fatalf("entry for %d missing from allStackAddrs = %+v", nicID, allStackAddrs) - } - if l := len(allNICAddrs); l != 0 { - t.Fatalf("got len(allNICAddrs) = %d, want = 0", l) - } -} - -// TestLeaveIPv6SolicitedNodeAddrBeforeAddrRemoval tests that removing an IPv6 -// address after leaving its solicited node multicast address does not result in -// an error. -func TestLeaveIPv6SolicitedNodeAddrBeforeAddrRemoval(t *testing.T) { - const nicID = 1 - - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - }) - e := channel.New(10, 1280, linkAddr1) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(%d, _): %s", nicID, err) - } - - if err := s.AddAddress(nicID, ipv6.ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(%d, %d, %s): %s", nicID, ipv6.ProtocolNumber, addr1, err) - } - - // The NIC should have joined addr1's solicited node multicast address. - snmc := header.SolicitedNodeAddr(addr1) - in, err := s.IsInGroup(nicID, snmc) - if err != nil { - t.Fatalf("IsInGroup(%d, %s): %s", nicID, snmc, err) - } - if !in { - t.Fatalf("got IsInGroup(%d, %s) = false, want = true", nicID, snmc) - } - - if err := s.LeaveGroup(ipv6.ProtocolNumber, nicID, snmc); err != nil { - t.Fatalf("LeaveGroup(%d, %d, %s): %s", ipv6.ProtocolNumber, nicID, snmc, err) - } - in, err = s.IsInGroup(nicID, snmc) - if err != nil { - t.Fatalf("IsInGroup(%d, %s): %s", nicID, snmc, err) - } - if in { - t.Fatalf("got IsInGroup(%d, %s) = true, want = false", nicID, snmc) - } - - if err := s.RemoveAddress(nicID, addr1); err != nil { - t.Fatalf("RemoveAddress(%d, %s) = %s", nicID, addr1, err) - } -} - -func TestJoinLeaveAllNodesMulticastOnNICEnableDisable(t *testing.T) { - const nicID = 1 - - e := loopback.New() - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - }) - nicOpts := stack.NICOptions{Disabled: true} - if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil { - t.Fatalf("CreateNIC(%d, _, %+v) = %s", nicID, nicOpts, err) - } - - // Should not be in the IPv6 all-nodes multicast group yet because the NIC has - // not been enabled yet. - isInGroup, err := s.IsInGroup(nicID, header.IPv6AllNodesMulticastAddress) - if err != nil { - t.Fatalf("IsInGroup(%d, %s): %s", nicID, header.IPv6AllNodesMulticastAddress, err) - } - if isInGroup { - t.Fatalf("got IsInGroup(%d, %s) = true, want = false", nicID, header.IPv6AllNodesMulticastAddress) - } - - // The all-nodes multicast group should be joined when the NIC is enabled. - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - isInGroup, err = s.IsInGroup(nicID, header.IPv6AllNodesMulticastAddress) - if err != nil { - t.Fatalf("IsInGroup(%d, %s): %s", nicID, header.IPv6AllNodesMulticastAddress, err) - } - if !isInGroup { - t.Fatalf("got IsInGroup(%d, %s) = false, want = true", nicID, header.IPv6AllNodesMulticastAddress) - } - - // The all-nodes multicast group should be left when the NIC is disabled. - if err := s.DisableNIC(nicID); err != nil { - t.Fatalf("s.DisableNIC(%d): %s", nicID, err) - } - isInGroup, err = s.IsInGroup(nicID, header.IPv6AllNodesMulticastAddress) - if err != nil { - t.Fatalf("IsInGroup(%d, %s): %s", nicID, header.IPv6AllNodesMulticastAddress, err) - } - if isInGroup { - t.Fatalf("got IsInGroup(%d, %s) = true, want = false", nicID, header.IPv6AllNodesMulticastAddress) - } -} - -// TestDoDADWhenNICEnabled tests that IPv6 endpoints that were added while a NIC -// was disabled have DAD performed on them when the NIC is enabled. -func TestDoDADWhenNICEnabled(t *testing.T) { - const dadTransmits = 1 - const retransmitTimer = time.Second - const nicID = 1 - - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent), - } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: stack.NDPConfigurations{ - DupAddrDetectTransmits: dadTransmits, - RetransmitTimer: retransmitTimer, - }, - NDPDisp: &ndpDisp, - } - - e := channel.New(dadTransmits, 1280, linkAddr1) - s := stack.New(opts) - nicOpts := stack.NICOptions{Disabled: true} - if err := s.CreateNICWithOptions(nicID, e, nicOpts); err != nil { - t.Fatalf("CreateNIC(%d, _, %+v) = %s", nicID, nicOpts, err) - } - - addr := tcpip.ProtocolAddress{ - Protocol: header.IPv6ProtocolNumber, - AddressWithPrefix: tcpip.AddressWithPrefix{ - Address: llAddr1, - PrefixLen: 128, - }, - } - if err := s.AddProtocolAddress(nicID, addr); err != nil { - t.Fatalf("AddProtocolAddress(%d, %+v): %s", nicID, addr, err) - } - - // Address should be in the list of all addresses. - if addrs := s.AllAddresses()[nicID]; !containsV6Addr(addrs, addr.AddressWithPrefix) { - t.Fatalf("got s.AllAddresses()[%d] = %+v, want = %+v", nicID, addrs, addr) - } - - // Address should be tentative so it should not be a main address. - got, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); got != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, got, want) - } - - // Enabling the NIC should start DAD for the address. - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - if addrs := s.AllAddresses()[nicID]; !containsV6Addr(addrs, addr.AddressWithPrefix) { - t.Fatalf("got s.AllAddresses()[%d] = %+v, want = %+v", nicID, addrs, addr) - } - - // Address should not be considered bound to the NIC yet (DAD ongoing). - got, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if want := (tcpip.AddressWithPrefix{}); got != want { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, got, want) - } - - // Wait for DAD to resolve. - select { - case <-time.After(dadTransmits*retransmitTimer + defaultAsyncEventTimeout): - t.Fatal("timed out waiting for DAD resolution") - case e := <-ndpDisp.dadC: - if diff := checkDADEvent(e, nicID, addr.AddressWithPrefix.Address, true, nil); diff != "" { - t.Errorf("dad event mismatch (-want +got):\n%s", diff) - } - } - if addrs := s.AllAddresses()[nicID]; !containsV6Addr(addrs, addr.AddressWithPrefix) { - t.Fatalf("got s.AllAddresses()[%d] = %+v, want = %+v", nicID, addrs, addr) - } - got, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if got != addr.AddressWithPrefix { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = %s, want = %s", nicID, header.IPv6ProtocolNumber, got, addr.AddressWithPrefix) - } - - // Enabling the NIC again should be a no-op. - if err := s.EnableNIC(nicID); err != nil { - t.Fatalf("s.EnableNIC(%d): %s", nicID, err) - } - if addrs := s.AllAddresses()[nicID]; !containsV6Addr(addrs, addr.AddressWithPrefix) { - t.Fatalf("got s.AllAddresses()[%d] = %+v, want = %+v", nicID, addrs, addr) - } - got, err = s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (_, %v), want = (_, nil)", nicID, header.IPv6ProtocolNumber, err) - } - if got != addr.AddressWithPrefix { - t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, got, addr.AddressWithPrefix) - } -} diff --git a/pkg/tcpip/stack/transport_demuxer_test.go b/pkg/tcpip/stack/transport_demuxer_test.go deleted file mode 100644 index 73dada928..000000000 --- a/pkg/tcpip/stack/transport_demuxer_test.go +++ /dev/null @@ -1,390 +0,0 @@ -// 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 stack_test - -import ( - "math" - "math/rand" - "testing" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/link/channel" - "gvisor.dev/gvisor/pkg/tcpip/network/ipv4" - "gvisor.dev/gvisor/pkg/tcpip/network/ipv6" - "gvisor.dev/gvisor/pkg/tcpip/ports" - "gvisor.dev/gvisor/pkg/tcpip/stack" - "gvisor.dev/gvisor/pkg/tcpip/transport/udp" - "gvisor.dev/gvisor/pkg/waiter" -) - -const ( - testSrcAddrV6 = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01" - testDstAddrV6 = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" - - testSrcAddrV4 = "\x0a\x00\x00\x01" - testDstAddrV4 = "\x0a\x00\x00\x02" - - testDstPort = 1234 - testSrcPort = 4096 -) - -type testContext struct { - linkEps map[tcpip.NICID]*channel.Endpoint - s *stack.Stack - wq waiter.Queue -} - -// newDualTestContextMultiNIC creates the testing context and also linkEpIDs NICs. -func newDualTestContextMultiNIC(t *testing.T, mtu uint32, linkEpIDs []tcpip.NICID) *testContext { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol(), ipv6.NewProtocol()}, - TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()}, - }) - linkEps := make(map[tcpip.NICID]*channel.Endpoint) - for _, linkEpID := range linkEpIDs { - channelEp := channel.New(256, mtu, "") - if err := s.CreateNIC(linkEpID, channelEp); err != nil { - t.Fatalf("CreateNIC failed: %s", err) - } - linkEps[linkEpID] = channelEp - - if err := s.AddAddress(linkEpID, ipv4.ProtocolNumber, testDstAddrV4); err != nil { - t.Fatalf("AddAddress IPv4 failed: %s", err) - } - - if err := s.AddAddress(linkEpID, ipv6.ProtocolNumber, testDstAddrV6); err != nil { - t.Fatalf("AddAddress IPv6 failed: %s", err) - } - } - - s.SetRouteTable([]tcpip.Route{ - {Destination: header.IPv4EmptySubnet, NIC: 1}, - {Destination: header.IPv6EmptySubnet, NIC: 1}, - }) - - return &testContext{ - s: s, - linkEps: linkEps, - } -} - -type headers struct { - srcPort, dstPort uint16 -} - -func newPayload() []byte { - b := make([]byte, 30+rand.Intn(100)) - for i := range b { - b[i] = byte(rand.Intn(256)) - } - return b -} - -func (c *testContext) sendV4Packet(payload []byte, h *headers, linkEpID tcpip.NICID) { - buf := buffer.NewView(header.UDPMinimumSize + header.IPv4MinimumSize + len(payload)) - payloadStart := len(buf) - len(payload) - copy(buf[payloadStart:], payload) - - // Initialize the IP header. - ip := header.IPv4(buf) - ip.Encode(&header.IPv4Fields{ - IHL: header.IPv4MinimumSize, - TOS: 0x80, - TotalLength: uint16(len(buf)), - TTL: 65, - Protocol: uint8(udp.ProtocolNumber), - SrcAddr: testSrcAddrV4, - DstAddr: testDstAddrV4, - }) - ip.SetChecksum(^ip.CalculateChecksum()) - - // Initialize the UDP header. - u := header.UDP(buf[header.IPv4MinimumSize:]) - u.Encode(&header.UDPFields{ - SrcPort: h.srcPort, - DstPort: h.dstPort, - Length: uint16(header.UDPMinimumSize + len(payload)), - }) - - // Calculate the UDP pseudo-header checksum. - xsum := header.PseudoHeaderChecksum(udp.ProtocolNumber, testSrcAddrV4, testDstAddrV4, uint16(len(u))) - - // Calculate the UDP checksum and set it. - xsum = header.Checksum(payload, xsum) - u.SetChecksum(^u.CalculateChecksum(xsum)) - - // Inject packet. - c.linkEps[linkEpID].InjectInbound(ipv4.ProtocolNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - NetworkHeader: buffer.View(ip), - TransportHeader: buffer.View(u), - }) -} - -func (c *testContext) sendV6Packet(payload []byte, h *headers, linkEpID tcpip.NICID) { - // Allocate a buffer for data and headers. - buf := buffer.NewView(header.UDPMinimumSize + header.IPv6MinimumSize + len(payload)) - copy(buf[len(buf)-len(payload):], payload) - - // Initialize the IP header. - ip := header.IPv6(buf) - ip.Encode(&header.IPv6Fields{ - PayloadLength: uint16(header.UDPMinimumSize + len(payload)), - NextHeader: uint8(udp.ProtocolNumber), - HopLimit: 65, - SrcAddr: testSrcAddrV6, - DstAddr: testDstAddrV6, - }) - - // Initialize the UDP header. - u := header.UDP(buf[header.IPv6MinimumSize:]) - u.Encode(&header.UDPFields{ - SrcPort: h.srcPort, - DstPort: h.dstPort, - Length: uint16(header.UDPMinimumSize + len(payload)), - }) - - // Calculate the UDP pseudo-header checksum. - xsum := header.PseudoHeaderChecksum(udp.ProtocolNumber, testSrcAddrV6, testDstAddrV6, uint16(len(u))) - - // Calculate the UDP checksum and set it. - xsum = header.Checksum(payload, xsum) - u.SetChecksum(^u.CalculateChecksum(xsum)) - - // Inject packet. - c.linkEps[linkEpID].InjectInbound(ipv6.ProtocolNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - NetworkHeader: buffer.View(ip), - TransportHeader: buffer.View(u), - }) -} - -func TestTransportDemuxerRegister(t *testing.T) { - for _, test := range []struct { - name string - proto tcpip.NetworkProtocolNumber - want *tcpip.Error - }{ - {"failure", ipv6.ProtocolNumber, tcpip.ErrUnknownProtocol}, - {"success", ipv4.ProtocolNumber, nil}, - } { - t.Run(test.name, func(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol()}, - TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()}, - }) - var wq waiter.Queue - ep, err := s.NewEndpoint(udp.ProtocolNumber, ipv4.ProtocolNumber, &wq) - if err != nil { - t.Fatal(err) - } - tEP, ok := ep.(stack.TransportEndpoint) - if !ok { - t.Fatalf("%T does not implement stack.TransportEndpoint", ep) - } - if got, want := s.RegisterTransportEndpoint(0, []tcpip.NetworkProtocolNumber{test.proto}, udp.ProtocolNumber, stack.TransportEndpointID{}, tEP, ports.Flags{}, 0), test.want; got != want { - t.Fatalf("s.RegisterTransportEndpoint(...) = %s, want %s", got, want) - } - }) - } -} - -// TestBindToDeviceDistribution injects varied packets on input devices and checks that -// the distribution of packets received matches expectations. -func TestBindToDeviceDistribution(t *testing.T) { - type endpointSockopts struct { - reuse bool - bindToDevice tcpip.NICID - } - for _, test := range []struct { - name string - // endpoints will received the inject packets. - endpoints []endpointSockopts - // wantDistributions is the want ratio of packets received on each - // endpoint for each NIC on which packets are injected. - wantDistributions map[tcpip.NICID][]float64 - }{ - { - "BindPortReuse", - // 5 endpoints that all have reuse set. - []endpointSockopts{ - {reuse: true, bindToDevice: 0}, - {reuse: true, bindToDevice: 0}, - {reuse: true, bindToDevice: 0}, - {reuse: true, bindToDevice: 0}, - {reuse: true, bindToDevice: 0}, - }, - map[tcpip.NICID][]float64{ - // Injected packets on dev0 get distributed evenly. - 1: {0.2, 0.2, 0.2, 0.2, 0.2}, - }, - }, - { - "BindToDevice", - // 3 endpoints with various bindings. - []endpointSockopts{ - {reuse: false, bindToDevice: 1}, - {reuse: false, bindToDevice: 2}, - {reuse: false, bindToDevice: 3}, - }, - map[tcpip.NICID][]float64{ - // Injected packets on dev0 go only to the endpoint bound to dev0. - 1: {1, 0, 0}, - // Injected packets on dev1 go only to the endpoint bound to dev1. - 2: {0, 1, 0}, - // Injected packets on dev2 go only to the endpoint bound to dev2. - 3: {0, 0, 1}, - }, - }, - { - "ReuseAndBindToDevice", - // 6 endpoints with various bindings. - []endpointSockopts{ - {reuse: true, bindToDevice: 1}, - {reuse: true, bindToDevice: 1}, - {reuse: true, bindToDevice: 2}, - {reuse: true, bindToDevice: 2}, - {reuse: true, bindToDevice: 2}, - {reuse: true, bindToDevice: 0}, - }, - map[tcpip.NICID][]float64{ - // Injected packets on dev0 get distributed among endpoints bound to - // dev0. - 1: {0.5, 0.5, 0, 0, 0, 0}, - // Injected packets on dev1 get distributed among endpoints bound to - // dev1 or unbound. - 2: {0, 0, 1. / 3, 1. / 3, 1. / 3, 0}, - // Injected packets on dev999 go only to the unbound. - 1000: {0, 0, 0, 0, 0, 1}, - }, - }, - } { - for protoName, netProtoNum := range map[string]tcpip.NetworkProtocolNumber{ - "IPv4": ipv4.ProtocolNumber, - "IPv6": ipv6.ProtocolNumber, - } { - for device, wantDistribution := range test.wantDistributions { - t.Run(test.name+protoName+string(device), func(t *testing.T) { - var devices []tcpip.NICID - for d := range test.wantDistributions { - devices = append(devices, d) - } - c := newDualTestContextMultiNIC(t, defaultMTU, devices) - - eps := make(map[tcpip.Endpoint]int) - - pollChannel := make(chan tcpip.Endpoint) - for i, endpoint := range test.endpoints { - // Try to receive the data. - wq := waiter.Queue{} - we, ch := waiter.NewChannelEntry(nil) - wq.EventRegister(&we, waiter.EventIn) - defer wq.EventUnregister(&we) - defer close(ch) - - var err *tcpip.Error - ep, err := c.s.NewEndpoint(udp.ProtocolNumber, netProtoNum, &wq) - if err != nil { - t.Fatalf("NewEndpoint failed: %s", err) - } - eps[ep] = i - - go func(ep tcpip.Endpoint) { - for range ch { - pollChannel <- ep - } - }(ep) - - defer ep.Close() - if err := ep.SetSockOptBool(tcpip.ReusePortOption, endpoint.reuse); err != nil { - t.Fatalf("SetSockOptBool(ReusePortOption, %t) on endpoint %d failed: %s", endpoint.reuse, i, err) - } - bindToDeviceOption := tcpip.BindToDeviceOption(endpoint.bindToDevice) - if err := ep.SetSockOpt(bindToDeviceOption); err != nil { - t.Fatalf("SetSockOpt(%#v) on endpoint %d failed: %s", bindToDeviceOption, i, err) - } - - var dstAddr tcpip.Address - switch netProtoNum { - case ipv4.ProtocolNumber: - dstAddr = testDstAddrV4 - case ipv6.ProtocolNumber: - dstAddr = testDstAddrV6 - default: - t.Fatalf("unexpected protocol number: %d", netProtoNum) - } - if err := ep.Bind(tcpip.FullAddress{Addr: dstAddr, Port: testDstPort}); err != nil { - t.Fatalf("ep.Bind(...) on endpoint %d failed: %s", i, err) - } - } - - npackets := 100000 - nports := 10000 - if got, want := len(test.endpoints), len(wantDistribution); got != want { - t.Fatalf("got len(test.endpoints) = %d, want %d", got, want) - } - ports := make(map[uint16]tcpip.Endpoint) - stats := make(map[tcpip.Endpoint]int) - for i := 0; i < npackets; i++ { - // Send a packet. - port := uint16(i % nports) - payload := newPayload() - hdrs := &headers{ - srcPort: testSrcPort + port, - dstPort: testDstPort, - } - switch netProtoNum { - case ipv4.ProtocolNumber: - c.sendV4Packet(payload, hdrs, device) - case ipv6.ProtocolNumber: - c.sendV6Packet(payload, hdrs, device) - default: - t.Fatalf("unexpected protocol number: %d", netProtoNum) - } - - ep := <-pollChannel - if _, _, err := ep.Read(nil); err != nil { - t.Fatalf("Read on endpoint %d failed: %s", eps[ep], err) - } - stats[ep]++ - if i < nports { - ports[uint16(i)] = ep - } else { - // Check that all packets from one client are handled by the same - // socket. - if want, got := ports[port], ep; want != got { - t.Fatalf("Packet sent on port %d expected on endpoint %d but received on endpoint %d", port, eps[want], eps[got]) - } - } - } - - // Check that a packet distribution is as expected. - for ep, i := range eps { - wantRatio := wantDistribution[i] - wantRecv := wantRatio * float64(npackets) - actualRecv := stats[ep] - actualRatio := float64(stats[ep]) / float64(npackets) - // The deviation is less than 10%. - if math.Abs(actualRatio-wantRatio) > 0.05 { - t.Errorf("want about %.0f%% (%.0f of %d) packets to arrive on endpoint %d, got %.0f%% (%d of %d)", wantRatio*100, wantRecv, npackets, i, actualRatio*100, actualRecv, npackets) - } - } - }) - } - } - } -} diff --git a/pkg/tcpip/stack/transport_test.go b/pkg/tcpip/stack/transport_test.go deleted file mode 100644 index 7e8b84867..000000000 --- a/pkg/tcpip/stack/transport_test.go +++ /dev/null @@ -1,664 +0,0 @@ -// 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 stack_test - -import ( - "testing" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/link/channel" - "gvisor.dev/gvisor/pkg/tcpip/link/loopback" - "gvisor.dev/gvisor/pkg/tcpip/ports" - "gvisor.dev/gvisor/pkg/tcpip/stack" - "gvisor.dev/gvisor/pkg/waiter" -) - -const ( - fakeTransNumber tcpip.TransportProtocolNumber = 1 - fakeTransHeaderLen = 3 -) - -// fakeTransportEndpoint is a transport-layer protocol endpoint. It counts -// received packets; the counts of all endpoints are aggregated in the protocol -// descriptor. -// -// Headers of this protocol are fakeTransHeaderLen bytes, but we currently don't -// use it. -type fakeTransportEndpoint struct { - stack.TransportEndpointInfo - stack *stack.Stack - proto *fakeTransportProtocol - peerAddr tcpip.Address - route stack.Route - uniqueID uint64 - - // acceptQueue is non-nil iff bound. - acceptQueue []fakeTransportEndpoint -} - -func (f *fakeTransportEndpoint) Info() tcpip.EndpointInfo { - return &f.TransportEndpointInfo -} - -func (f *fakeTransportEndpoint) Stats() tcpip.EndpointStats { - return nil -} - -func (f *fakeTransportEndpoint) SetOwner(owner tcpip.PacketOwner) {} - -func newFakeTransportEndpoint(s *stack.Stack, proto *fakeTransportProtocol, netProto tcpip.NetworkProtocolNumber, uniqueID uint64) tcpip.Endpoint { - return &fakeTransportEndpoint{stack: s, TransportEndpointInfo: stack.TransportEndpointInfo{NetProto: netProto}, proto: proto, uniqueID: uniqueID} -} - -func (f *fakeTransportEndpoint) Abort() { - f.Close() -} - -func (f *fakeTransportEndpoint) Close() { - f.route.Release() -} - -func (*fakeTransportEndpoint) Readiness(mask waiter.EventMask) waiter.EventMask { - return mask -} - -func (*fakeTransportEndpoint) Read(*tcpip.FullAddress) (buffer.View, tcpip.ControlMessages, *tcpip.Error) { - return buffer.View{}, tcpip.ControlMessages{}, nil -} - -func (f *fakeTransportEndpoint) Write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-chan struct{}, *tcpip.Error) { - if len(f.route.RemoteAddress) == 0 { - return 0, nil, tcpip.ErrNoRoute - } - - hdr := buffer.NewPrependable(int(f.route.MaxHeaderLength()) + fakeTransHeaderLen) - hdr.Prepend(fakeTransHeaderLen) - v, err := p.FullPayload() - if err != nil { - return 0, nil, err - } - if err := f.route.WritePacket(nil /* gso */, stack.NetworkHeaderParams{Protocol: fakeTransNumber, TTL: 123, TOS: stack.DefaultTOS}, &stack.PacketBuffer{ - Header: hdr, - Data: buffer.View(v).ToVectorisedView(), - }); err != nil { - return 0, nil, err - } - - return int64(len(v)), nil, nil -} - -func (f *fakeTransportEndpoint) Peek([][]byte) (int64, tcpip.ControlMessages, *tcpip.Error) { - return 0, tcpip.ControlMessages{}, nil -} - -// SetSockOpt sets a socket option. Currently not supported. -func (*fakeTransportEndpoint) SetSockOpt(interface{}) *tcpip.Error { - return tcpip.ErrInvalidEndpointState -} - -// SetSockOptBool sets a socket option. Currently not supported. -func (*fakeTransportEndpoint) SetSockOptBool(tcpip.SockOptBool, bool) *tcpip.Error { - return tcpip.ErrInvalidEndpointState -} - -// SetSockOptInt sets a socket option. Currently not supported. -func (*fakeTransportEndpoint) SetSockOptInt(tcpip.SockOptInt, int) *tcpip.Error { - return tcpip.ErrInvalidEndpointState -} - -// GetSockOptBool implements tcpip.Endpoint.GetSockOptBool. -func (*fakeTransportEndpoint) GetSockOptBool(opt tcpip.SockOptBool) (bool, *tcpip.Error) { - return false, tcpip.ErrUnknownProtocolOption -} - -// GetSockOptInt implements tcpip.Endpoint.GetSockOptInt. -func (*fakeTransportEndpoint) GetSockOptInt(opt tcpip.SockOptInt) (int, *tcpip.Error) { - return -1, tcpip.ErrUnknownProtocolOption -} - -// GetSockOpt implements tcpip.Endpoint.GetSockOpt. -func (*fakeTransportEndpoint) GetSockOpt(opt interface{}) *tcpip.Error { - switch opt.(type) { - case tcpip.ErrorOption: - return nil - } - return tcpip.ErrInvalidEndpointState -} - -// Disconnect implements tcpip.Endpoint.Disconnect. -func (*fakeTransportEndpoint) Disconnect() *tcpip.Error { - return tcpip.ErrNotSupported -} - -func (f *fakeTransportEndpoint) Connect(addr tcpip.FullAddress) *tcpip.Error { - f.peerAddr = addr.Addr - - // Find the route. - r, err := f.stack.FindRoute(addr.NIC, "", addr.Addr, fakeNetNumber, false /* multicastLoop */) - if err != nil { - return tcpip.ErrNoRoute - } - defer r.Release() - - // Try to register so that we can start receiving packets. - f.ID.RemoteAddress = addr.Addr - err = f.stack.RegisterTransportEndpoint(0, []tcpip.NetworkProtocolNumber{fakeNetNumber}, fakeTransNumber, f.ID, f, ports.Flags{}, 0 /* bindToDevice */) - if err != nil { - return err - } - - f.route = r.Clone() - - return nil -} - -func (f *fakeTransportEndpoint) UniqueID() uint64 { - return f.uniqueID -} - -func (f *fakeTransportEndpoint) ConnectEndpoint(e tcpip.Endpoint) *tcpip.Error { - return nil -} - -func (*fakeTransportEndpoint) Shutdown(tcpip.ShutdownFlags) *tcpip.Error { - return nil -} - -func (*fakeTransportEndpoint) Reset() { -} - -func (*fakeTransportEndpoint) Listen(int) *tcpip.Error { - return nil -} - -func (f *fakeTransportEndpoint) Accept() (tcpip.Endpoint, *waiter.Queue, *tcpip.Error) { - if len(f.acceptQueue) == 0 { - return nil, nil, nil - } - a := f.acceptQueue[0] - f.acceptQueue = f.acceptQueue[1:] - return &a, nil, nil -} - -func (f *fakeTransportEndpoint) Bind(a tcpip.FullAddress) *tcpip.Error { - if err := f.stack.RegisterTransportEndpoint( - a.NIC, - []tcpip.NetworkProtocolNumber{fakeNetNumber}, - fakeTransNumber, - stack.TransportEndpointID{LocalAddress: a.Addr}, - f, - ports.Flags{}, - 0, /* bindtoDevice */ - ); err != nil { - return err - } - f.acceptQueue = []fakeTransportEndpoint{} - return nil -} - -func (*fakeTransportEndpoint) GetLocalAddress() (tcpip.FullAddress, *tcpip.Error) { - return tcpip.FullAddress{}, nil -} - -func (*fakeTransportEndpoint) GetRemoteAddress() (tcpip.FullAddress, *tcpip.Error) { - return tcpip.FullAddress{}, nil -} - -func (f *fakeTransportEndpoint) HandlePacket(r *stack.Route, id stack.TransportEndpointID, _ *stack.PacketBuffer) { - // Increment the number of received packets. - f.proto.packetCount++ - if f.acceptQueue != nil { - f.acceptQueue = append(f.acceptQueue, fakeTransportEndpoint{ - stack: f.stack, - TransportEndpointInfo: stack.TransportEndpointInfo{ - ID: f.ID, - NetProto: f.NetProto, - }, - proto: f.proto, - peerAddr: r.RemoteAddress, - route: r.Clone(), - }) - } -} - -func (f *fakeTransportEndpoint) HandleControlPacket(stack.TransportEndpointID, stack.ControlType, uint32, *stack.PacketBuffer) { - // Increment the number of received control packets. - f.proto.controlCount++ -} - -func (f *fakeTransportEndpoint) State() uint32 { - return 0 -} - -func (f *fakeTransportEndpoint) ModerateRecvBuf(copied int) {} - -func (f *fakeTransportEndpoint) IPTables() (stack.IPTables, error) { - return stack.IPTables{}, nil -} - -func (f *fakeTransportEndpoint) Resume(*stack.Stack) {} - -func (f *fakeTransportEndpoint) Wait() {} - -type fakeTransportGoodOption bool - -type fakeTransportBadOption bool - -type fakeTransportInvalidValueOption int - -type fakeTransportProtocolOptions struct { - good bool -} - -// fakeTransportProtocol is a transport-layer protocol descriptor. It -// aggregates the number of packets received via endpoints of this protocol. -type fakeTransportProtocol struct { - packetCount int - controlCount int - opts fakeTransportProtocolOptions -} - -func (*fakeTransportProtocol) Number() tcpip.TransportProtocolNumber { - return fakeTransNumber -} - -func (f *fakeTransportProtocol) NewEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, _ *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { - return newFakeTransportEndpoint(stack, f, netProto, stack.UniqueID()), nil -} - -func (*fakeTransportProtocol) NewRawEndpoint(stack *stack.Stack, netProto tcpip.NetworkProtocolNumber, _ *waiter.Queue) (tcpip.Endpoint, *tcpip.Error) { - return nil, tcpip.ErrUnknownProtocol -} - -func (*fakeTransportProtocol) MinimumPacketSize() int { - return fakeTransHeaderLen -} - -func (*fakeTransportProtocol) ParsePorts(buffer.View) (src, dst uint16, err *tcpip.Error) { - return 0, 0, nil -} - -func (*fakeTransportProtocol) HandleUnknownDestinationPacket(*stack.Route, stack.TransportEndpointID, *stack.PacketBuffer) bool { - return true -} - -func (f *fakeTransportProtocol) SetOption(option interface{}) *tcpip.Error { - switch v := option.(type) { - case fakeTransportGoodOption: - f.opts.good = bool(v) - return nil - case fakeTransportInvalidValueOption: - return tcpip.ErrInvalidOptionValue - default: - return tcpip.ErrUnknownProtocolOption - } -} - -func (f *fakeTransportProtocol) Option(option interface{}) *tcpip.Error { - switch v := option.(type) { - case *fakeTransportGoodOption: - *v = fakeTransportGoodOption(f.opts.good) - return nil - default: - return tcpip.ErrUnknownProtocolOption - } -} - -// Abort implements TransportProtocol.Abort. -func (*fakeTransportProtocol) Abort() {} - -// Close implements tcpip.Endpoint.Close. -func (*fakeTransportProtocol) Close() {} - -// Wait implements TransportProtocol.Wait. -func (*fakeTransportProtocol) Wait() {} - -// Parse implements TransportProtocol.Parse. -func (*fakeTransportProtocol) Parse(pkt *stack.PacketBuffer) bool { - hdr, ok := pkt.Data.PullUp(fakeTransHeaderLen) - if !ok { - return false - } - pkt.TransportHeader = hdr - pkt.Data.TrimFront(fakeTransHeaderLen) - return true -} - -func fakeTransFactory() stack.TransportProtocol { - return &fakeTransportProtocol{} -} - -func TestTransportReceive(t *testing.T) { - linkEP := channel.New(10, defaultMTU, "") - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - TransportProtocols: []stack.TransportProtocol{fakeTransFactory()}, - }) - if err := s.CreateNIC(1, linkEP); err != nil { - t.Fatalf("CreateNIC failed: %v", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatalf("AddAddress failed: %v", err) - } - - // Create endpoint and connect to remote address. - wq := waiter.Queue{} - ep, err := s.NewEndpoint(fakeTransNumber, fakeNetNumber, &wq) - if err != nil { - t.Fatalf("NewEndpoint failed: %v", err) - } - - if err := ep.Connect(tcpip.FullAddress{0, "\x02", 0}); err != nil { - t.Fatalf("Connect failed: %v", err) - } - - fakeTrans := s.TransportProtocolInstance(fakeTransNumber).(*fakeTransportProtocol) - - // Create buffer that will hold the packet. - buf := buffer.NewView(30) - - // Make sure packet with wrong protocol is not delivered. - buf[0] = 1 - buf[2] = 0 - linkEP.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeTrans.packetCount != 0 { - t.Errorf("packetCount = %d, want %d", fakeTrans.packetCount, 0) - } - - // Make sure packet from the wrong source is not delivered. - buf[0] = 1 - buf[1] = 3 - buf[2] = byte(fakeTransNumber) - linkEP.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeTrans.packetCount != 0 { - t.Errorf("packetCount = %d, want %d", fakeTrans.packetCount, 0) - } - - // Make sure packet is delivered. - buf[0] = 1 - buf[1] = 2 - buf[2] = byte(fakeTransNumber) - linkEP.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeTrans.packetCount != 1 { - t.Errorf("packetCount = %d, want %d", fakeTrans.packetCount, 1) - } -} - -func TestTransportControlReceive(t *testing.T) { - linkEP := channel.New(10, defaultMTU, "") - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - TransportProtocols: []stack.TransportProtocol{fakeTransFactory()}, - }) - if err := s.CreateNIC(1, linkEP); err != nil { - t.Fatalf("CreateNIC failed: %v", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatalf("AddAddress failed: %v", err) - } - - // Create endpoint and connect to remote address. - wq := waiter.Queue{} - ep, err := s.NewEndpoint(fakeTransNumber, fakeNetNumber, &wq) - if err != nil { - t.Fatalf("NewEndpoint failed: %v", err) - } - - if err := ep.Connect(tcpip.FullAddress{0, "\x02", 0}); err != nil { - t.Fatalf("Connect failed: %v", err) - } - - fakeTrans := s.TransportProtocolInstance(fakeTransNumber).(*fakeTransportProtocol) - - // Create buffer that will hold the control packet. - buf := buffer.NewView(2*fakeNetHeaderLen + 30) - - // Outer packet contains the control protocol number. - buf[0] = 1 - buf[1] = 0xfe - buf[2] = uint8(fakeControlProtocol) - - // Make sure packet with wrong protocol is not delivered. - buf[fakeNetHeaderLen+0] = 0 - buf[fakeNetHeaderLen+1] = 1 - buf[fakeNetHeaderLen+2] = 0 - linkEP.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeTrans.controlCount != 0 { - t.Errorf("controlCount = %d, want %d", fakeTrans.controlCount, 0) - } - - // Make sure packet from the wrong source is not delivered. - buf[fakeNetHeaderLen+0] = 3 - buf[fakeNetHeaderLen+1] = 1 - buf[fakeNetHeaderLen+2] = byte(fakeTransNumber) - linkEP.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeTrans.controlCount != 0 { - t.Errorf("controlCount = %d, want %d", fakeTrans.controlCount, 0) - } - - // Make sure packet is delivered. - buf[fakeNetHeaderLen+0] = 2 - buf[fakeNetHeaderLen+1] = 1 - buf[fakeNetHeaderLen+2] = byte(fakeTransNumber) - linkEP.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: buf.ToVectorisedView(), - }) - if fakeTrans.controlCount != 1 { - t.Errorf("controlCount = %d, want %d", fakeTrans.controlCount, 1) - } -} - -func TestTransportSend(t *testing.T) { - linkEP := channel.New(10, defaultMTU, "") - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - TransportProtocols: []stack.TransportProtocol{fakeTransFactory()}, - }) - if err := s.CreateNIC(1, linkEP); err != nil { - t.Fatalf("CreateNIC failed: %v", err) - } - - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatalf("AddAddress failed: %v", err) - } - - { - subnet, err := tcpip.NewSubnet("\x00", "\x00") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 1}}) - } - - // Create endpoint and bind it. - wq := waiter.Queue{} - ep, err := s.NewEndpoint(fakeTransNumber, fakeNetNumber, &wq) - if err != nil { - t.Fatalf("NewEndpoint failed: %v", err) - } - - if err := ep.Connect(tcpip.FullAddress{0, "\x02", 0}); err != nil { - t.Fatalf("Connect failed: %v", err) - } - - // Create buffer that will hold the payload. - view := buffer.NewView(30) - _, _, err = ep.Write(tcpip.SlicePayload(view), tcpip.WriteOptions{}) - if err != nil { - t.Fatalf("write failed: %v", err) - } - - fakeNet := s.NetworkProtocolInstance(fakeNetNumber).(*fakeNetworkProtocol) - - if fakeNet.sendPacketCount[2] != 1 { - t.Errorf("sendPacketCount = %d, want %d", fakeNet.sendPacketCount[2], 1) - } -} - -func TestTransportOptions(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - TransportProtocols: []stack.TransportProtocol{fakeTransFactory()}, - }) - - // Try an unsupported transport protocol. - if err := s.SetTransportProtocolOption(tcpip.TransportProtocolNumber(99999), fakeTransportGoodOption(false)); err != tcpip.ErrUnknownProtocol { - t.Fatalf("SetTransportProtocolOption(fakeTrans2, blah, false) = %v, want = tcpip.ErrUnknownProtocol", err) - } - - testCases := []struct { - option interface{} - wantErr *tcpip.Error - verifier func(t *testing.T, p stack.TransportProtocol) - }{ - {fakeTransportGoodOption(true), nil, func(t *testing.T, p stack.TransportProtocol) { - t.Helper() - fakeTrans := p.(*fakeTransportProtocol) - if fakeTrans.opts.good != true { - t.Fatalf("fakeTrans.opts.good = false, want = true") - } - var v fakeTransportGoodOption - if err := s.TransportProtocolOption(fakeTransNumber, &v); err != nil { - t.Fatalf("s.TransportProtocolOption(fakeTransNumber, &v) = %v, want = nil, where v is option %T", v, err) - } - if v != true { - t.Fatalf("s.TransportProtocolOption(fakeTransNumber, &v) returned v = %v, want = true", v) - } - - }}, - {fakeTransportBadOption(true), tcpip.ErrUnknownProtocolOption, nil}, - {fakeTransportInvalidValueOption(1), tcpip.ErrInvalidOptionValue, nil}, - } - for _, tc := range testCases { - if got := s.SetTransportProtocolOption(fakeTransNumber, tc.option); got != tc.wantErr { - t.Errorf("s.SetTransportProtocolOption(fakeTrans, %v) = %v, want = %v", tc.option, got, tc.wantErr) - } - if tc.verifier != nil { - tc.verifier(t, s.TransportProtocolInstance(fakeTransNumber)) - } - } -} - -func TestTransportForwarding(t *testing.T) { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - TransportProtocols: []stack.TransportProtocol{fakeTransFactory()}, - }) - s.SetForwarding(true) - - // TODO(b/123449044): Change this to a channel NIC. - ep1 := loopback.New() - if err := s.CreateNIC(1, ep1); err != nil { - t.Fatalf("CreateNIC #1 failed: %v", err) - } - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatalf("AddAddress #1 failed: %v", err) - } - - ep2 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(2, ep2); err != nil { - t.Fatalf("CreateNIC #2 failed: %v", err) - } - if err := s.AddAddress(2, fakeNetNumber, "\x02"); err != nil { - t.Fatalf("AddAddress #2 failed: %v", err) - } - - // Route all packets to address 3 to NIC 2 and all packets to address - // 1 to NIC 1. - { - subnet0, err := tcpip.NewSubnet("\x03", "\xff") - if err != nil { - t.Fatal(err) - } - subnet1, err := tcpip.NewSubnet("\x01", "\xff") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{ - {Destination: subnet0, Gateway: "\x00", NIC: 2}, - {Destination: subnet1, Gateway: "\x00", NIC: 1}, - }) - } - - wq := waiter.Queue{} - ep, err := s.NewEndpoint(fakeTransNumber, fakeNetNumber, &wq) - if err != nil { - t.Fatalf("NewEndpoint failed: %v", err) - } - - if err := ep.Bind(tcpip.FullAddress{Addr: "\x01", NIC: 1}); err != nil { - t.Fatalf("Bind failed: %v", err) - } - - // Send a packet to address 1 from address 3. - req := buffer.NewView(30) - req[0] = 1 - req[1] = 3 - req[2] = byte(fakeTransNumber) - ep2.InjectInbound(fakeNetNumber, &stack.PacketBuffer{ - Data: req.ToVectorisedView(), - }) - - aep, _, err := ep.Accept() - if err != nil || aep == nil { - t.Fatalf("Accept failed: %v, %v", aep, err) - } - - resp := buffer.NewView(30) - if _, _, err := aep.Write(tcpip.SlicePayload(resp), tcpip.WriteOptions{}); err != nil { - t.Fatalf("Write failed: %v", err) - } - - p, ok := ep2.Read() - if !ok { - t.Fatal("Response packet not forwarded") - } - - if dst := p.Pkt.NetworkHeader[0]; dst != 3 { - t.Errorf("Response packet has incorrect destination addresss: got = %d, want = 3", dst) - } - if src := p.Pkt.NetworkHeader[1]; src != 1 { - t.Errorf("Response packet has incorrect source addresss: got = %d, want = 3", src) - } -} |