| // 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 udp_test |
| |
| import ( |
| "bytes" |
| "fmt" |
| "math" |
| "math/rand" |
| "testing" |
| "time" |
| |
| "github.com/google/netstack/tcpip" |
| "github.com/google/netstack/tcpip/buffer" |
| "github.com/google/netstack/tcpip/checker" |
| "github.com/google/netstack/tcpip/header" |
| "github.com/google/netstack/tcpip/link/channel" |
| "github.com/google/netstack/tcpip/link/sniffer" |
| "github.com/google/netstack/tcpip/network/ipv4" |
| "github.com/google/netstack/tcpip/network/ipv6" |
| "github.com/google/netstack/tcpip/stack" |
| "github.com/google/netstack/tcpip/transport/udp" |
| "github.com/google/netstack/waiter" |
| ) |
| |
| // Addresses and ports used for testing. It is recommended that tests stick to |
| // using these addresses as it allows using the testFlow helper. |
| // Naming rules: 'stack*'' denotes local addresses and ports, while 'test*' |
| // represents the remote endpoint. |
| const ( |
| v4MappedAddrPrefix = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff" |
| stackV6Addr = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01" |
| testV6Addr = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" |
| stackV4MappedAddr = v4MappedAddrPrefix + stackAddr |
| testV4MappedAddr = v4MappedAddrPrefix + testAddr |
| multicastV4MappedAddr = v4MappedAddrPrefix + multicastAddr |
| broadcastV4MappedAddr = v4MappedAddrPrefix + broadcastAddr |
| v4MappedWildcardAddr = v4MappedAddrPrefix + "\x00\x00\x00\x00" |
| |
| stackAddr = "\x0a\x00\x00\x01" |
| stackPort = 1234 |
| testAddr = "\x0a\x00\x00\x02" |
| testPort = 4096 |
| multicastAddr = "\xe8\x2b\xd3\xea" |
| multicastV6Addr = "\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" |
| broadcastAddr = header.IPv4Broadcast |
| |
| // 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 |
| ) |
| |
| // header4Tuple stores the 4-tuple {src-IP, src-port, dst-IP, dst-port} used in |
| // a packet header. These values are used to populate a header or verify one. |
| // Note that because they are used in packet headers, the addresses are never in |
| // a V4-mapped format. |
| type header4Tuple struct { |
| srcAddr tcpip.FullAddress |
| dstAddr tcpip.FullAddress |
| } |
| |
| // testFlow implements a helper type used for sending and receiving test |
| // packets. A given test flow value defines 1) the socket endpoint used for the |
| // test and 2) the type of packet send or received on the endpoint. E.g., a |
| // multicastV6Only flow is a V6 multicast packet passing through a V6-only |
| // endpoint. The type provides helper methods to characterize the flow (e.g., |
| // isV4) as well as return a proper header4Tuple for it. |
| type testFlow int |
| |
| const ( |
| unicastV4 testFlow = iota // V4 unicast on a V4 socket |
| unicastV4in6 // V4-mapped unicast on a V6-dual socket |
| unicastV6 // V6 unicast on a V6 socket |
| unicastV6Only // V6 unicast on a V6-only socket |
| multicastV4 // V4 multicast on a V4 socket |
| multicastV4in6 // V4-mapped multicast on a V6-dual socket |
| multicastV6 // V6 multicast on a V6 socket |
| multicastV6Only // V6 multicast on a V6-only socket |
| broadcast // V4 broadcast on a V4 socket |
| broadcastIn6 // V4-mapped broadcast on a V6-dual socket |
| ) |
| |
| func (flow testFlow) String() string { |
| switch flow { |
| case unicastV4: |
| return "unicastV4" |
| case unicastV6: |
| return "unicastV6" |
| case unicastV6Only: |
| return "unicastV6Only" |
| case unicastV4in6: |
| return "unicastV4in6" |
| case multicastV4: |
| return "multicastV4" |
| case multicastV6: |
| return "multicastV6" |
| case multicastV6Only: |
| return "multicastV6Only" |
| case multicastV4in6: |
| return "multicastV4in6" |
| case broadcast: |
| return "broadcast" |
| case broadcastIn6: |
| return "broadcastIn6" |
| default: |
| return "unknown" |
| } |
| } |
| |
| // packetDirection explains if a flow is incoming (read) or outgoing (write). |
| type packetDirection int |
| |
| const ( |
| incoming packetDirection = iota |
| outgoing |
| ) |
| |
| // header4Tuple returns the header4Tuple for the given flow and direction. Note |
| // that the tuple contains no mapped addresses as those only exist at the socket |
| // level but not at the packet header level. |
| func (flow testFlow) header4Tuple(d packetDirection) header4Tuple { |
| var h header4Tuple |
| if flow.isV4() { |
| if d == outgoing { |
| h = header4Tuple{ |
| srcAddr: tcpip.FullAddress{Addr: stackAddr, Port: stackPort}, |
| dstAddr: tcpip.FullAddress{Addr: testAddr, Port: testPort}, |
| } |
| } else { |
| h = header4Tuple{ |
| srcAddr: tcpip.FullAddress{Addr: testAddr, Port: testPort}, |
| dstAddr: tcpip.FullAddress{Addr: stackAddr, Port: stackPort}, |
| } |
| } |
| if flow.isMulticast() { |
| h.dstAddr.Addr = multicastAddr |
| } else if flow.isBroadcast() { |
| h.dstAddr.Addr = broadcastAddr |
| } |
| } else { // IPv6 |
| if d == outgoing { |
| h = header4Tuple{ |
| srcAddr: tcpip.FullAddress{Addr: stackV6Addr, Port: stackPort}, |
| dstAddr: tcpip.FullAddress{Addr: testV6Addr, Port: testPort}, |
| } |
| } else { |
| h = header4Tuple{ |
| srcAddr: tcpip.FullAddress{Addr: testV6Addr, Port: testPort}, |
| dstAddr: tcpip.FullAddress{Addr: stackV6Addr, Port: stackPort}, |
| } |
| } |
| if flow.isMulticast() { |
| h.dstAddr.Addr = multicastV6Addr |
| } |
| } |
| return h |
| } |
| |
| func (flow testFlow) getMcastAddr() tcpip.Address { |
| if flow.isV4() { |
| return multicastAddr |
| } |
| return multicastV6Addr |
| } |
| |
| // mapAddrIfApplicable converts the given V4 address into its V4-mapped version |
| // if it is applicable to the flow. |
| func (flow testFlow) mapAddrIfApplicable(v4Addr tcpip.Address) tcpip.Address { |
| if flow.isMapped() { |
| return v4MappedAddrPrefix + v4Addr |
| } |
| return v4Addr |
| } |
| |
| // netProto returns the protocol number used for the network packet. |
| func (flow testFlow) netProto() tcpip.NetworkProtocolNumber { |
| if flow.isV4() { |
| return ipv4.ProtocolNumber |
| } |
| return ipv6.ProtocolNumber |
| } |
| |
| // sockProto returns the protocol number used when creating the socket |
| // endpoint for this flow. |
| func (flow testFlow) sockProto() tcpip.NetworkProtocolNumber { |
| switch flow { |
| case unicastV4in6, unicastV6, unicastV6Only, multicastV4in6, multicastV6, multicastV6Only, broadcastIn6: |
| return ipv6.ProtocolNumber |
| case unicastV4, multicastV4, broadcast: |
| return ipv4.ProtocolNumber |
| default: |
| panic(fmt.Sprintf("invalid testFlow given: %d", flow)) |
| } |
| } |
| |
| func (flow testFlow) checkerFn() func(*testing.T, []byte, ...checker.NetworkChecker) { |
| if flow.isV4() { |
| return checker.IPv4 |
| } |
| return checker.IPv6 |
| } |
| |
| func (flow testFlow) isV6() bool { return !flow.isV4() } |
| func (flow testFlow) isV4() bool { |
| return flow.sockProto() == ipv4.ProtocolNumber || flow.isMapped() |
| } |
| |
| func (flow testFlow) isV6Only() bool { |
| switch flow { |
| case unicastV6Only, multicastV6Only: |
| return true |
| case unicastV4, unicastV4in6, unicastV6, multicastV4, multicastV4in6, multicastV6, broadcast, broadcastIn6: |
| return false |
| default: |
| panic(fmt.Sprintf("invalid testFlow given: %d", flow)) |
| } |
| } |
| |
| func (flow testFlow) isMulticast() bool { |
| switch flow { |
| case multicastV4, multicastV4in6, multicastV6, multicastV6Only: |
| return true |
| case unicastV4, unicastV4in6, unicastV6, unicastV6Only, broadcast, broadcastIn6: |
| return false |
| default: |
| panic(fmt.Sprintf("invalid testFlow given: %d", flow)) |
| } |
| } |
| |
| func (flow testFlow) isBroadcast() bool { |
| switch flow { |
| case broadcast, broadcastIn6: |
| return true |
| case unicastV4, unicastV4in6, unicastV6, unicastV6Only, multicastV4, multicastV4in6, multicastV6, multicastV6Only: |
| return false |
| default: |
| panic(fmt.Sprintf("invalid testFlow given: %d", flow)) |
| } |
| } |
| |
| func (flow testFlow) isMapped() bool { |
| switch flow { |
| case unicastV4in6, multicastV4in6, broadcastIn6: |
| return true |
| case unicastV4, unicastV6, unicastV6Only, multicastV4, multicastV6, multicastV6Only, broadcast: |
| return false |
| default: |
| panic(fmt.Sprintf("invalid testFlow given: %d", flow)) |
| } |
| } |
| |
| type testContext struct { |
| t *testing.T |
| linkEP *channel.Endpoint |
| s *stack.Stack |
| |
| ep tcpip.Endpoint |
| wq waiter.Queue |
| } |
| |
| func newDualTestContext(t *testing.T, mtu uint32) *testContext { |
| t.Helper() |
| |
| s := stack.New([]string{ipv4.ProtocolName, ipv6.ProtocolName}, []string{udp.ProtocolName}, stack.Options{}) |
| |
| id, linkEP := channel.New(256, mtu, "") |
| if testing.Verbose() { |
| id = sniffer.New(id) |
| } |
| if err := s.CreateNIC(1, id); err != nil { |
| t.Fatalf("CreateNIC failed: %v", err) |
| } |
| |
| if err := s.AddAddress(1, ipv4.ProtocolNumber, stackAddr); err != nil { |
| t.Fatalf("AddAddress failed: %v", err) |
| } |
| |
| if err := s.AddAddress(1, ipv6.ProtocolNumber, stackV6Addr); err != nil { |
| t.Fatalf("AddAddress failed: %v", err) |
| } |
| |
| s.SetRouteTable([]tcpip.Route{ |
| { |
| Destination: header.IPv4EmptySubnet, |
| NIC: 1, |
| }, |
| { |
| Destination: header.IPv6EmptySubnet, |
| NIC: 1, |
| }, |
| }) |
| |
| return &testContext{ |
| t: t, |
| s: s, |
| linkEP: linkEP, |
| } |
| } |
| |
| func (c *testContext) cleanup() { |
| if c.ep != nil { |
| c.ep.Close() |
| } |
| } |
| |
| func (c *testContext) createEndpoint(proto tcpip.NetworkProtocolNumber) { |
| c.t.Helper() |
| |
| var err *tcpip.Error |
| c.ep, err = c.s.NewEndpoint(udp.ProtocolNumber, proto, &c.wq) |
| if err != nil { |
| c.t.Fatal("NewEndpoint failed: ", err) |
| } |
| } |
| |
| func (c *testContext) createEndpointForFlow(flow testFlow) { |
| c.t.Helper() |
| |
| c.createEndpoint(flow.sockProto()) |
| if flow.isV6Only() { |
| if err := c.ep.SetSockOpt(tcpip.V6OnlyOption(1)); err != nil { |
| c.t.Fatalf("SetSockOpt failed: %v", err) |
| } |
| } else if flow.isBroadcast() { |
| if err := c.ep.SetSockOpt(tcpip.BroadcastOption(1)); err != nil { |
| c.t.Fatal("SetSockOpt failed:", err) |
| } |
| } |
| } |
| |
| // getPacketAndVerify reads a packet from the link endpoint and verifies the |
| // header against expected values from the given test flow. In addition, it |
| // calls any extra checker functions provided. |
| func (c *testContext) getPacketAndVerify(flow testFlow, checkers ...checker.NetworkChecker) []byte { |
| c.t.Helper() |
| |
| select { |
| case p := <-c.linkEP.C: |
| if p.Proto != flow.netProto() { |
| c.t.Fatalf("Bad network protocol: got %v, wanted %v", p.Proto, flow.netProto()) |
| } |
| b := make([]byte, len(p.Header)+len(p.Payload)) |
| copy(b, p.Header) |
| copy(b[len(p.Header):], p.Payload) |
| |
| h := flow.header4Tuple(outgoing) |
| checkers := append( |
| checkers, |
| checker.SrcAddr(h.srcAddr.Addr), |
| checker.DstAddr(h.dstAddr.Addr), |
| checker.UDP(checker.DstPort(h.dstAddr.Port)), |
| ) |
| flow.checkerFn()(c.t, b, checkers...) |
| return b |
| |
| case <-time.After(2 * time.Second): |
| c.t.Fatalf("Packet wasn't written out") |
| } |
| |
| return nil |
| } |
| |
| // injectPacket creates a packet of the given flow and with the given payload, |
| // and injects it into the link endpoint. |
| func (c *testContext) injectPacket(flow testFlow, payload []byte) { |
| c.t.Helper() |
| |
| h := flow.header4Tuple(incoming) |
| if flow.isV4() { |
| c.injectV4Packet(payload, &h) |
| } else { |
| c.injectV6Packet(payload, &h) |
| } |
| } |
| |
| // injectV6Packet creates a V6 test packet with the given payload and header |
| // values, and injects it into the link endpoint. |
| func (c *testContext) injectV6Packet(payload []byte, h *header4Tuple) { |
| // 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: h.srcAddr.Addr, |
| DstAddr: h.dstAddr.Addr, |
| }) |
| |
| // Initialize the UDP header. |
| u := header.UDP(buf[header.IPv6MinimumSize:]) |
| u.Encode(&header.UDPFields{ |
| SrcPort: h.srcAddr.Port, |
| DstPort: h.dstAddr.Port, |
| Length: uint16(header.UDPMinimumSize + len(payload)), |
| }) |
| |
| // Calculate the UDP pseudo-header checksum. |
| xsum := header.PseudoHeaderChecksum(udp.ProtocolNumber, h.srcAddr.Addr, h.dstAddr.Addr, uint16(len(u))) |
| |
| // Calculate the UDP checksum and set it. |
| xsum = header.Checksum(payload, xsum) |
| u.SetChecksum(^u.CalculateChecksum(xsum)) |
| |
| // Inject packet. |
| c.linkEP.Inject(ipv6.ProtocolNumber, buf.ToVectorisedView()) |
| } |
| |
| // injectV6Packet creates a V4 test packet with the given payload and header |
| // values, and injects it into the link endpoint. |
| func (c *testContext) injectV4Packet(payload []byte, h *header4Tuple) { |
| // Allocate a buffer for data and headers. |
| buf := buffer.NewView(header.UDPMinimumSize + header.IPv4MinimumSize + len(payload)) |
| copy(buf[len(buf)-len(payload):], payload) |
| |
| // Initialize the IP header. |
| ip := header.IPv4(buf) |
| ip.Encode(&header.IPv4Fields{ |
| IHL: header.IPv4MinimumSize, |
| TotalLength: uint16(len(buf)), |
| TTL: 65, |
| Protocol: uint8(udp.ProtocolNumber), |
| SrcAddr: h.srcAddr.Addr, |
| DstAddr: h.dstAddr.Addr, |
| }) |
| ip.SetChecksum(^ip.CalculateChecksum()) |
| |
| // Initialize the UDP header. |
| u := header.UDP(buf[header.IPv4MinimumSize:]) |
| u.Encode(&header.UDPFields{ |
| SrcPort: h.srcAddr.Port, |
| DstPort: h.dstAddr.Port, |
| Length: uint16(header.UDPMinimumSize + len(payload)), |
| }) |
| |
| // Calculate the UDP pseudo-header checksum. |
| xsum := header.PseudoHeaderChecksum(udp.ProtocolNumber, h.srcAddr.Addr, h.dstAddr.Addr, uint16(len(u))) |
| |
| // Calculate the UDP checksum and set it. |
| xsum = header.Checksum(payload, xsum) |
| u.SetChecksum(^u.CalculateChecksum(xsum)) |
| |
| // Inject packet. |
| c.linkEP.Inject(ipv4.ProtocolNumber, buf.ToVectorisedView()) |
| } |
| |
| func newPayload() []byte { |
| b := make([]byte, 30+rand.Intn(100)) |
| for i := range b { |
| b[i] = byte(rand.Intn(256)) |
| } |
| return b |
| } |
| |
| func TestBindPortReuse(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| var eps [5]tcpip.Endpoint |
| reusePortOpt := tcpip.ReusePortOption(1) |
| |
| pollChannel := make(chan tcpip.Endpoint) |
| for i := 0; i < len(eps); i++ { |
| // 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 |
| eps[i], err = c.s.NewEndpoint(udp.ProtocolNumber, ipv6.ProtocolNumber, &wq) |
| if err != nil { |
| c.t.Fatalf("NewEndpoint failed: %v", err) |
| } |
| |
| go func(ep tcpip.Endpoint) { |
| for range ch { |
| pollChannel <- ep |
| } |
| }(eps[i]) |
| |
| defer eps[i].Close() |
| if err := eps[i].SetSockOpt(reusePortOpt); err != nil { |
| c.t.Fatalf("SetSockOpt failed failed: %v", err) |
| } |
| if err := eps[i].Bind(tcpip.FullAddress{Addr: stackV6Addr, Port: stackPort}); err != nil { |
| t.Fatalf("ep.Bind(...) failed: %v", err) |
| } |
| } |
| |
| npackets := 100000 |
| nports := 10000 |
| 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() |
| c.injectV6Packet(payload, &header4Tuple{ |
| srcAddr: tcpip.FullAddress{Addr: testV6Addr, Port: testPort + port}, |
| dstAddr: tcpip.FullAddress{Addr: stackV6Addr, Port: stackPort}, |
| }) |
| |
| var addr tcpip.FullAddress |
| ep := <-pollChannel |
| _, _, err := ep.Read(&addr) |
| if err != nil { |
| c.t.Fatalf("Read failed: %v", 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 ports[port] != ep { |
| t.Fatalf("Port mismatch") |
| } |
| } |
| } |
| |
| if len(stats) != len(eps) { |
| t.Fatalf("Only %d(expected %d) sockets received packets", len(stats), len(eps)) |
| } |
| |
| // Check that a packet distribution is fair between sockets. |
| for _, c := range stats { |
| n := float64(npackets) / float64(len(eps)) |
| // The deviation is less than 10%. |
| if math.Abs(float64(c)-n) > n/10 { |
| t.Fatal(c, n) |
| } |
| } |
| } |
| |
| // testRead sends a packet of the given test flow into the stack by injecting it |
| // into the link endpoint. It then reads it from the UDP endpoint and verifies |
| // its correctness. |
| func testRead(c *testContext, flow testFlow) { |
| c.t.Helper() |
| |
| payload := newPayload() |
| c.injectPacket(flow, payload) |
| |
| // Try to receive the data. |
| we, ch := waiter.NewChannelEntry(nil) |
| c.wq.EventRegister(&we, waiter.EventIn) |
| defer c.wq.EventUnregister(&we) |
| |
| var addr tcpip.FullAddress |
| v, _, err := c.ep.Read(&addr) |
| if err == tcpip.ErrWouldBlock { |
| // Wait for data to become available. |
| select { |
| case <-ch: |
| v, _, err = c.ep.Read(&addr) |
| if err != nil { |
| c.t.Fatalf("Read failed: %v", err) |
| } |
| |
| case <-time.After(1 * time.Second): |
| c.t.Fatalf("Timed out waiting for data") |
| } |
| } |
| |
| // Check the peer address. |
| h := flow.header4Tuple(incoming) |
| if addr.Addr != h.srcAddr.Addr { |
| c.t.Fatalf("Unexpected remote address: got %v, want %v", addr.Addr, h.srcAddr) |
| } |
| |
| // Check the payload. |
| if !bytes.Equal(payload, v) { |
| c.t.Fatalf("Bad payload: got %x, want %x", v, payload) |
| } |
| } |
| |
| func TestBindEphemeralPort(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| if err := c.ep.Bind(tcpip.FullAddress{}); err != nil { |
| t.Fatalf("ep.Bind(...) failed: %v", err) |
| } |
| } |
| |
| func TestBindReservedPort(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| if err := c.ep.Connect(tcpip.FullAddress{Addr: testV6Addr, Port: testPort}); err != nil { |
| c.t.Fatalf("Connect failed: %v", err) |
| } |
| |
| addr, err := c.ep.GetLocalAddress() |
| if err != nil { |
| t.Fatalf("GetLocalAddress failed: %v", err) |
| } |
| |
| // We can't bind the address reserved by the connected endpoint above. |
| { |
| ep, err := c.s.NewEndpoint(udp.ProtocolNumber, ipv6.ProtocolNumber, &c.wq) |
| if err != nil { |
| t.Fatalf("NewEndpoint failed: %v", err) |
| } |
| defer ep.Close() |
| if got, want := ep.Bind(addr), tcpip.ErrPortInUse; got != want { |
| t.Fatalf("got ep.Bind(...) = %v, want = %v", got, want) |
| } |
| } |
| |
| func() { |
| ep, err := c.s.NewEndpoint(udp.ProtocolNumber, ipv4.ProtocolNumber, &c.wq) |
| if err != nil { |
| t.Fatalf("NewEndpoint failed: %v", err) |
| } |
| defer ep.Close() |
| // We can't bind ipv4-any on the port reserved by the connected endpoint |
| // above, since the endpoint is dual-stack. |
| if got, want := ep.Bind(tcpip.FullAddress{Port: addr.Port}), tcpip.ErrPortInUse; got != want { |
| t.Fatalf("got ep.Bind(...) = %v, want = %v", got, want) |
| } |
| // We can bind an ipv4 address on this port, though. |
| if err := ep.Bind(tcpip.FullAddress{Addr: stackAddr, Port: addr.Port}); err != nil { |
| t.Fatalf("ep.Bind(...) failed: %v", err) |
| } |
| }() |
| |
| // Once the connected endpoint releases its port reservation, we are able to |
| // bind ipv4-any once again. |
| c.ep.Close() |
| func() { |
| ep, err := c.s.NewEndpoint(udp.ProtocolNumber, ipv4.ProtocolNumber, &c.wq) |
| if err != nil { |
| t.Fatalf("NewEndpoint failed: %v", err) |
| } |
| defer ep.Close() |
| if err := ep.Bind(tcpip.FullAddress{Port: addr.Port}); err != nil { |
| t.Fatalf("ep.Bind(...) failed: %v", err) |
| } |
| }() |
| } |
| |
| func TestV4ReadOnV6(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(unicastV4in6) |
| |
| // Bind to wildcard. |
| if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| // Test acceptance. |
| testRead(c, unicastV4in6) |
| } |
| |
| func TestV4ReadOnBoundToV4MappedWildcard(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(unicastV4in6) |
| |
| // Bind to v4 mapped wildcard. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: v4MappedWildcardAddr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| // Test acceptance. |
| testRead(c, unicastV4in6) |
| } |
| |
| func TestV4ReadOnBoundToV4Mapped(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(unicastV4in6) |
| |
| // Bind to local address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: stackV4MappedAddr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| // Test acceptance. |
| testRead(c, unicastV4in6) |
| } |
| |
| func TestV6ReadOnV6(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(unicastV6) |
| |
| // Bind to wildcard. |
| if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| // Test acceptance. |
| testRead(c, unicastV6) |
| } |
| |
| func TestV4ReadOnV4(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(unicastV4) |
| |
| // Bind to wildcard. |
| if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| // Test acceptance. |
| testRead(c, unicastV4) |
| } |
| |
| // TestReadOnBoundToMulticast checks that an endpoint can bind to a multicast |
| // address and receive data sent to that address. |
| func TestReadOnBoundToMulticast(t *testing.T) { |
| // FIXME(b/128189410): multicastV4in6 currently doesn't work as |
| // AddMembershipOption doesn't handle V4in6 addresses. |
| for _, flow := range []testFlow{multicastV4, multicastV6, multicastV6Only} { |
| t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to multicast address. |
| mcastAddr := flow.mapAddrIfApplicable(flow.getMcastAddr()) |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: mcastAddr, Port: stackPort}); err != nil { |
| c.t.Fatal("Bind failed:", err) |
| } |
| |
| // Join multicast group. |
| ifoptSet := tcpip.AddMembershipOption{NIC: 1, MulticastAddr: mcastAddr} |
| if err := c.ep.SetSockOpt(ifoptSet); err != nil { |
| c.t.Fatal("SetSockOpt failed:", err) |
| } |
| |
| testRead(c, flow) |
| }) |
| } |
| } |
| |
| // TestV4ReadOnBoundToBroadcast checks that an endpoint can bind to a broadcast |
| // address and receive broadcast data on it. |
| func TestV4ReadOnBoundToBroadcast(t *testing.T) { |
| for _, flow := range []testFlow{broadcast, broadcastIn6} { |
| t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to broadcast address. |
| bcastAddr := flow.mapAddrIfApplicable(broadcastAddr) |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: bcastAddr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %s", err) |
| } |
| |
| // Test acceptance. |
| testRead(c, flow) |
| }) |
| } |
| } |
| |
| // testFailingWrite sends a packet of the given test flow into the UDP endpoint |
| // and verifies it fails with the provided error code. |
| func testFailingWrite(c *testContext, flow testFlow, wantErr *tcpip.Error) { |
| c.t.Helper() |
| |
| h := flow.header4Tuple(outgoing) |
| writeDstAddr := flow.mapAddrIfApplicable(h.dstAddr.Addr) |
| |
| payload := buffer.View(newPayload()) |
| _, _, gotErr := c.ep.Write(tcpip.SlicePayload(payload), tcpip.WriteOptions{ |
| To: &tcpip.FullAddress{Addr: writeDstAddr, Port: h.dstAddr.Port}, |
| }) |
| if gotErr != wantErr { |
| c.t.Fatalf("Write returned unexpected error: got %v, want %v", gotErr, wantErr) |
| } |
| } |
| |
| // testWrite sends a packet of the given test flow from the UDP endpoint to the |
| // flow's destination address:port. It then receives it from the link endpoint |
| // and verifies its correctness including any additional checker functions |
| // provided. |
| func testWrite(c *testContext, flow testFlow, checkers ...checker.NetworkChecker) uint16 { |
| c.t.Helper() |
| return testWriteInternal(c, flow, true, checkers...) |
| } |
| |
| // testWriteWithoutDestination sends a packet of the given test flow from the |
| // UDP endpoint without giving a destination address:port. It then receives it |
| // from the link endpoint and verifies its correctness including any additional |
| // checker functions provided. |
| func testWriteWithoutDestination(c *testContext, flow testFlow, checkers ...checker.NetworkChecker) uint16 { |
| c.t.Helper() |
| return testWriteInternal(c, flow, false, checkers...) |
| } |
| |
| func testWriteInternal(c *testContext, flow testFlow, setDest bool, checkers ...checker.NetworkChecker) uint16 { |
| c.t.Helper() |
| |
| writeOpts := tcpip.WriteOptions{} |
| if setDest { |
| h := flow.header4Tuple(outgoing) |
| writeDstAddr := flow.mapAddrIfApplicable(h.dstAddr.Addr) |
| writeOpts = tcpip.WriteOptions{ |
| To: &tcpip.FullAddress{Addr: writeDstAddr, Port: h.dstAddr.Port}, |
| } |
| } |
| payload := buffer.View(newPayload()) |
| n, _, err := c.ep.Write(tcpip.SlicePayload(payload), writeOpts) |
| if err != nil { |
| c.t.Fatalf("Write failed: %v", err) |
| } |
| if n != int64(len(payload)) { |
| c.t.Fatalf("Bad number of bytes written: got %v, want %v", n, len(payload)) |
| } |
| |
| // Received the packet and check the payload. |
| b := c.getPacketAndVerify(flow, checkers...) |
| var udp header.UDP |
| if flow.isV4() { |
| udp = header.UDP(header.IPv4(b).Payload()) |
| } else { |
| udp = header.UDP(header.IPv6(b).Payload()) |
| } |
| if !bytes.Equal(payload, udp.Payload()) { |
| c.t.Fatalf("Bad payload: got %x, want %x", udp.Payload(), payload) |
| } |
| |
| return udp.SourcePort() |
| } |
| |
| func testDualWrite(c *testContext) uint16 { |
| c.t.Helper() |
| |
| v4Port := testWrite(c, unicastV4in6) |
| v6Port := testWrite(c, unicastV6) |
| if v4Port != v6Port { |
| c.t.Fatalf("expected v4 and v6 ports to be equal: got v4Port = %d, v6Port = %d", v4Port, v6Port) |
| } |
| |
| return v4Port |
| } |
| |
| func TestDualWriteUnbound(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| testDualWrite(c) |
| } |
| |
| func TestDualWriteBoundToWildcard(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Bind to wildcard. |
| if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| p := testDualWrite(c) |
| if p != stackPort { |
| c.t.Fatalf("Bad port: got %v, want %v", p, stackPort) |
| } |
| } |
| |
| func TestDualWriteConnectedToV6(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Connect to v6 address. |
| if err := c.ep.Connect(tcpip.FullAddress{Addr: testV6Addr, Port: testPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| testWrite(c, unicastV6) |
| |
| // Write to V4 mapped address. |
| testFailingWrite(c, unicastV4in6, tcpip.ErrNetworkUnreachable) |
| } |
| |
| func TestDualWriteConnectedToV4Mapped(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Connect to v4 mapped address. |
| if err := c.ep.Connect(tcpip.FullAddress{Addr: testV4MappedAddr, Port: testPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| testWrite(c, unicastV4in6) |
| |
| // Write to v6 address. |
| testFailingWrite(c, unicastV6, tcpip.ErrInvalidEndpointState) |
| } |
| |
| func TestV4WriteOnV6Only(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(unicastV6Only) |
| |
| // Write to V4 mapped address. |
| testFailingWrite(c, unicastV4in6, tcpip.ErrNoRoute) |
| } |
| |
| func TestV6WriteOnBoundToV4Mapped(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Bind to v4 mapped address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: stackV4MappedAddr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| // Write to v6 address. |
| testFailingWrite(c, unicastV6, tcpip.ErrInvalidEndpointState) |
| } |
| |
| func TestV6WriteOnConnected(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Connect to v6 address. |
| if err := c.ep.Connect(tcpip.FullAddress{Addr: testV6Addr, Port: testPort}); err != nil { |
| c.t.Fatalf("Connect failed: %v", err) |
| } |
| |
| testWriteWithoutDestination(c, unicastV6) |
| } |
| |
| func TestV4WriteOnConnected(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Connect to v4 mapped address. |
| if err := c.ep.Connect(tcpip.FullAddress{Addr: testV4MappedAddr, Port: testPort}); err != nil { |
| c.t.Fatalf("Connect failed: %v", err) |
| } |
| |
| testWriteWithoutDestination(c, unicastV4) |
| } |
| |
| // TestWriteOnBoundToV4Multicast checks that we can send packets out of a socket |
| // that is bound to a V4 multicast address. |
| func TestWriteOnBoundToV4Multicast(t *testing.T) { |
| for _, flow := range []testFlow{unicastV4, multicastV4, broadcast} { |
| t.Run(fmt.Sprintf("%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to V4 mcast address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: multicastAddr, Port: stackPort}); err != nil { |
| c.t.Fatal("Bind failed:", err) |
| } |
| |
| testWrite(c, flow) |
| }) |
| } |
| } |
| |
| // TestWriteOnBoundToV4MappedMulticast checks that we can send packets out of a |
| // socket that is bound to a V4-mapped multicast address. |
| func TestWriteOnBoundToV4MappedMulticast(t *testing.T) { |
| for _, flow := range []testFlow{unicastV4in6, multicastV4in6, broadcastIn6} { |
| t.Run(fmt.Sprintf("%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to V4Mapped mcast address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: multicastV4MappedAddr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %s", err) |
| } |
| |
| testWrite(c, flow) |
| }) |
| } |
| } |
| |
| // TestWriteOnBoundToV6Multicast checks that we can send packets out of a |
| // socket that is bound to a V6 multicast address. |
| func TestWriteOnBoundToV6Multicast(t *testing.T) { |
| for _, flow := range []testFlow{unicastV6, multicastV6} { |
| t.Run(fmt.Sprintf("%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to V6 mcast address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: multicastV6Addr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %s", err) |
| } |
| |
| testWrite(c, flow) |
| }) |
| } |
| } |
| |
| // TestWriteOnBoundToV6Multicast checks that we can send packets out of a |
| // V6-only socket that is bound to a V6 multicast address. |
| func TestWriteOnBoundToV6OnlyMulticast(t *testing.T) { |
| for _, flow := range []testFlow{unicastV6Only, multicastV6Only} { |
| t.Run(fmt.Sprintf("%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to V6 mcast address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: multicastV6Addr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %s", err) |
| } |
| |
| testWrite(c, flow) |
| }) |
| } |
| } |
| |
| // TestWriteOnBoundToBroadcast checks that we can send packets out of a |
| // socket that is bound to the broadcast address. |
| func TestWriteOnBoundToBroadcast(t *testing.T) { |
| for _, flow := range []testFlow{unicastV4, multicastV4, broadcast} { |
| t.Run(fmt.Sprintf("%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to V4 broadcast address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: broadcastAddr, Port: stackPort}); err != nil { |
| c.t.Fatal("Bind failed:", err) |
| } |
| |
| testWrite(c, flow) |
| }) |
| } |
| } |
| |
| // TestWriteOnBoundToV4MappedBroadcast checks that we can send packets out of a |
| // socket that is bound to the V4-mapped broadcast address. |
| func TestWriteOnBoundToV4MappedBroadcast(t *testing.T) { |
| for _, flow := range []testFlow{unicastV4in6, multicastV4in6, broadcastIn6} { |
| t.Run(fmt.Sprintf("%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| // Bind to V4Mapped mcast address. |
| if err := c.ep.Bind(tcpip.FullAddress{Addr: broadcastV4MappedAddr, Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %s", err) |
| } |
| |
| testWrite(c, flow) |
| }) |
| } |
| } |
| |
| func TestReadIncrementsPacketsReceived(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| // Create IPv4 UDP endpoint |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| // Bind to wildcard. |
| if err := c.ep.Bind(tcpip.FullAddress{Port: stackPort}); err != nil { |
| c.t.Fatalf("Bind failed: %v", err) |
| } |
| |
| testRead(c, unicastV4) |
| |
| var want uint64 = 1 |
| if got := c.s.Stats().UDP.PacketsReceived.Value(); got != want { |
| c.t.Fatalf("Read did not increment PacketsReceived: got %v, want %v", got, want) |
| } |
| } |
| |
| func TestWriteIncrementsPacketsSent(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(ipv6.ProtocolNumber) |
| |
| testDualWrite(c) |
| |
| var want uint64 = 2 |
| if got := c.s.Stats().UDP.PacketsSent.Value(); got != want { |
| c.t.Fatalf("Write did not increment PacketsSent: got %v, want %v", got, want) |
| } |
| } |
| |
| func TestTTL(t *testing.T) { |
| for _, flow := range []testFlow{unicastV4, unicastV4in6, unicastV6, unicastV6Only, multicastV4, multicastV4in6, multicastV6, broadcast, broadcastIn6} { |
| t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) { |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpointForFlow(flow) |
| |
| const multicastTTL = 42 |
| if err := c.ep.SetSockOpt(tcpip.MulticastTTLOption(multicastTTL)); err != nil { |
| c.t.Fatalf("SetSockOpt failed: %v", err) |
| } |
| |
| var wantTTL uint8 |
| if flow.isMulticast() { |
| wantTTL = multicastTTL |
| } else { |
| var p stack.NetworkProtocol |
| if flow.isV4() { |
| p = ipv4.NewProtocol() |
| } else { |
| p = ipv6.NewProtocol() |
| } |
| ep, err := p.NewEndpoint(0, tcpip.AddressWithPrefix{}, nil, nil, nil) |
| if err != nil { |
| t.Fatal(err) |
| } |
| wantTTL = ep.DefaultTTL() |
| ep.Close() |
| } |
| |
| testWrite(c, flow, checker.TTL(wantTTL)) |
| }) |
| } |
| } |
| |
| func TestMulticastInterfaceOption(t *testing.T) { |
| for _, flow := range []testFlow{multicastV4, multicastV4in6, multicastV6, multicastV6Only} { |
| t.Run(fmt.Sprintf("flow:%s", flow), func(t *testing.T) { |
| for _, bindTyp := range []string{"bound", "unbound"} { |
| t.Run(bindTyp, func(t *testing.T) { |
| for _, optTyp := range []string{"use local-addr", "use NICID", "use local-addr and NIC"} { |
| t.Run(optTyp, func(t *testing.T) { |
| h := flow.header4Tuple(outgoing) |
| mcastAddr := h.dstAddr.Addr |
| localIfAddr := h.srcAddr.Addr |
| |
| var ifoptSet tcpip.MulticastInterfaceOption |
| switch optTyp { |
| case "use local-addr": |
| ifoptSet.InterfaceAddr = localIfAddr |
| case "use NICID": |
| ifoptSet.NIC = 1 |
| case "use local-addr and NIC": |
| ifoptSet.InterfaceAddr = localIfAddr |
| ifoptSet.NIC = 1 |
| default: |
| t.Fatal("unknown test variant") |
| } |
| |
| c := newDualTestContext(t, defaultMTU) |
| defer c.cleanup() |
| |
| c.createEndpoint(flow.sockProto()) |
| |
| if bindTyp == "bound" { |
| // Bind the socket by connecting to the multicast address. |
| // This may have an influence on how the multicast interface |
| // is set. |
| addr := tcpip.FullAddress{ |
| Addr: flow.mapAddrIfApplicable(mcastAddr), |
| Port: stackPort, |
| } |
| if err := c.ep.Connect(addr); err != nil { |
| c.t.Fatalf("Connect failed: %v", err) |
| } |
| } |
| |
| if err := c.ep.SetSockOpt(ifoptSet); err != nil { |
| c.t.Fatalf("SetSockOpt failed: %v", err) |
| } |
| |
| // Verify multicast interface addr and NIC were set correctly. |
| // Note that NIC must be 1 since this is our outgoing interface. |
| ifoptWant := tcpip.MulticastInterfaceOption{NIC: 1, InterfaceAddr: ifoptSet.InterfaceAddr} |
| var ifoptGot tcpip.MulticastInterfaceOption |
| if err := c.ep.GetSockOpt(&ifoptGot); err != nil { |
| c.t.Fatalf("GetSockOpt failed: %v", err) |
| } |
| if ifoptGot != ifoptWant { |
| c.t.Errorf("got GetSockOpt() = %#v, want = %#v", ifoptGot, ifoptWant) |
| } |
| }) |
| } |
| }) |
| } |
| }) |
| } |
| } |