diff options
Diffstat (limited to 'pkg/tcpip/stack')
| -rw-r--r-- | pkg/tcpip/stack/BUILD | 97 | ||||
| -rw-r--r-- | pkg/tcpip/stack/linkaddrcache_test.go | 277 | ||||
| -rwxr-xr-x | pkg/tcpip/stack/linkaddrentry_list.go | 173 | ||||
| -rwxr-xr-x[-rw-r--r--] | pkg/tcpip/stack/ndp.go | 0 | ||||
| -rw-r--r-- | pkg/tcpip/stack/ndp_test.go | 609 | ||||
| -rwxr-xr-x | pkg/tcpip/stack/stack_state_autogen.go | 125 | ||||
| -rw-r--r-- | pkg/tcpip/stack/stack_test.go | 2168 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_demuxer_test.go | 352 | ||||
| -rw-r--r-- | pkg/tcpip/stack/transport_test.go | 612 |
9 files changed, 298 insertions, 4115 deletions
diff --git a/pkg/tcpip/stack/BUILD b/pkg/tcpip/stack/BUILD deleted file mode 100644 index 460db3cf8..000000000 --- a/pkg/tcpip/stack/BUILD +++ /dev/null @@ -1,97 +0,0 @@ -load("@io_bazel_rules_go//go:def.bzl", "go_test") -load("//tools/go_generics:defs.bzl", "go_template_instance") -load("//tools/go_stateify:defs.bzl", "go_library") - -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_library( - name = "stack", - srcs = [ - "icmp_rate_limit.go", - "linkaddrcache.go", - "linkaddrentry_list.go", - "ndp.go", - "nic.go", - "registration.go", - "route.go", - "stack.go", - "stack_global_state.go", - "transport_demuxer.go", - ], - importpath = "gvisor.dev/gvisor/pkg/tcpip/stack", - visibility = [ - "//visibility:public", - ], - deps = [ - "//pkg/ilist", - "//pkg/rand", - "//pkg/sleep", - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/hash/jenkins", - "//pkg/tcpip/header", - "//pkg/tcpip/iptables", - "//pkg/tcpip/ports", - "//pkg/tcpip/seqnum", - "//pkg/waiter", - "@org_golang_x_time//rate:go_default_library", - ], -) - -go_test( - name = "stack_x_test", - size = "small", - srcs = [ - "ndp_test.go", - "stack_test.go", - "transport_demuxer_test.go", - "transport_test.go", - ], - deps = [ - ":stack", - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/checker", - "//pkg/tcpip/header", - "//pkg/tcpip/iptables", - "//pkg/tcpip/link/channel", - "//pkg/tcpip/link/loopback", - "//pkg/tcpip/network/ipv4", - "//pkg/tcpip/network/ipv6", - "//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 = ["linkaddrcache_test.go"], - embed = [":stack"], - deps = [ - "//pkg/sleep", - "//pkg/tcpip", - ], -) - -filegroup( - name = "autogen", - srcs = [ - "linkaddrentry_list.go", - ], - visibility = ["//:sandbox"], -) diff --git a/pkg/tcpip/stack/linkaddrcache_test.go b/pkg/tcpip/stack/linkaddrcache_test.go deleted file mode 100644 index 9946b8fe8..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" - "sync/atomic" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/sleep" - "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 100755 index 000000000..61a45ddcb --- /dev/null +++ b/pkg/tcpip/stack/linkaddrentry_list.go @@ -0,0 +1,173 @@ +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 +} + +// PushFront inserts the element e at the front of list l. +func (l *linkAddrEntryList) PushFront(e *linkAddrEntry) { + linkAddrEntryElementMapper{}.linkerFor(e).SetNext(l.head) + linkAddrEntryElementMapper{}.linkerFor(e).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) { + linkAddrEntryElementMapper{}.linkerFor(e).SetNext(nil) + linkAddrEntryElementMapper{}.linkerFor(e).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) { + a := linkAddrEntryElementMapper{}.linkerFor(b).Next() + linkAddrEntryElementMapper{}.linkerFor(e).SetNext(a) + linkAddrEntryElementMapper{}.linkerFor(e).SetPrev(b) + linkAddrEntryElementMapper{}.linkerFor(b).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) { + b := linkAddrEntryElementMapper{}.linkerFor(a).Prev() + linkAddrEntryElementMapper{}.linkerFor(e).SetNext(a) + linkAddrEntryElementMapper{}.linkerFor(e).SetPrev(b) + linkAddrEntryElementMapper{}.linkerFor(a).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) { + prev := linkAddrEntryElementMapper{}.linkerFor(e).Prev() + next := linkAddrEntryElementMapper{}.linkerFor(e).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 + } +} + +// 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.go b/pkg/tcpip/stack/ndp.go index 03ddebdbd..03ddebdbd 100644..100755 --- a/pkg/tcpip/stack/ndp.go +++ b/pkg/tcpip/stack/ndp.go diff --git a/pkg/tcpip/stack/ndp_test.go b/pkg/tcpip/stack/ndp_test.go deleted file mode 100644 index 525a25218..000000000 --- a/pkg/tcpip/stack/ndp_test.go +++ /dev/null @@ -1,609 +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 ( - "testing" - "time" - - "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" -) - -const ( - addr1 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01" - addr2 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02" - addr3 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03" - linkAddr1 = "\x02\x02\x03\x04\x05\x06" -) - -// 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) { - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - } - - e := channel.New(10, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(_) = %s", err) - } - - if err := s.AddAddress(1, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(_, %d, %s) = %s", header.IPv6ProtocolNumber, addr1, err) - } - - // Should get the address immediately since we should not have performed - // DAD on it. - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err) - } - if addr.Address != addr1 { - t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", 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) - } -} - -// 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 -} - -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 -} - -// Implements stack.NDPDispatcher.OnDuplicateAddressDetectionStatus. -// -// If the DAD event matches what we are expecting, send signal on n.dadC. -func (n *ndpDispatcher) OnDuplicateAddressDetectionStatus(nicid tcpip.NICID, addr tcpip.Address, resolved bool, err *tcpip.Error) { - n.dadC <- ndpDADEvent{ - nicid, - addr, - resolved, - err, - } -} - -// 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. -func TestDADResolve(t *testing.T) { - tests := []struct { - name string - dupAddrDetectTransmits uint8 - retransTimer time.Duration - expectedRetransmitTimer time.Duration - }{ - {"1:1s:1s", 1, time.Second, time.Second}, - {"2:1s:1s", 2, time.Second, time.Second}, - {"1:2s:2s", 1, 2 * time.Second, 2 * time.Second}, - // 0s is an invalid RetransmitTimer timer and will be fixed to - // the default RetransmitTimer value of 1s. - {"1:0s:1s", 1, 0, time.Second}, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - 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 := channel.New(10, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(_) = %s", err) - } - - if err := s.AddAddress(1, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(_, %d, %s) = %s", header.IPv6ProtocolNumber, addr1, err) - } - - stat := s.Stats().ICMP.V6PacketsSent.NeighborSolicit - - // Should have sent an NDP NS immediately. - if got := stat.Value(); got != 1 { - t.Fatalf("got NeighborSolicit = %d, want = 1", got) - - } - - // Address should not be considered bound to the NIC yet - // (DAD ongoing). - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", addr, want) - } - - // Wait for the remaining time - some delta (500ms), to - // make sure the address is still not resolved. - const delta = 500 * time.Millisecond - time.Sleep(test.expectedRetransmitTimer*time.Duration(test.dupAddrDetectTransmits) - delta) - addr, err = s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", 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 e.err != nil { - t.Fatal("got DAD error: ", e.err) - } - if e.nicid != 1 { - t.Fatalf("got DAD event w/ nicid = %d, want = 1", e.nicid) - } - if e.addr != addr1 { - t.Fatalf("got DAD event w/ addr = %s, want = %s", addr, addr1) - } - if !e.resolved { - t.Fatal("got DAD event w/ resolved = false, want = true") - } - } - addr, err = s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err) - } - if addr.Address != addr1 { - t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", addr, addr1) - } - - // Should not have sent any more NS messages. - if got := stat.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.C - - // Make sure its an IPv6 packet. - if p.Proto != header.IPv6ProtocolNumber { - t.Fatalf("got Proto = %d, want = %d", p.Proto, header.IPv6ProtocolNumber) - } - - // Check NDP packet. - checker.IPv6(t, p.Header.ToVectorisedView().First(), - checker.TTL(header.NDPHopLimit), - checker.NDPNS( - checker.NDPNSTargetAddress(addr1))) - } - }) - } - -} - -// 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) { - 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 { - hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborAdvertSize) - pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborAdvertSize)) - pkt.SetType(header.ICMPv6NeighborAdvert) - na := header.NDPNeighborAdvert(pkt.NDPPayload()) - na.SetSolicitedFlag(true) - na.SetOverrideFlag(true) - na.SetTargetAddress(tgt) - 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), - } - ndpConfigs := stack.DefaultNDPConfigurations() - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPConfigs: ndpConfigs, - NDPDisp: &ndpDisp, - } - opts.NDPConfigs.RetransmitTimer = time.Second * 2 - - e := channel.New(10, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(_) = %s", err) - } - - if err := s.AddAddress(1, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(_, %d, %s) = %s", header.IPv6ProtocolNumber, addr1, err) - } - - // Address should not be considered bound to the NIC yet - // (DAD ongoing). - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", addr, want) - } - - // Receive a packet to simulate multiple nodes owning or - // attempting to own the same address. - hdr := test.makeBuf(addr1) - e.Inject(header.IPv6ProtocolNumber, 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 e.err != nil { - t.Fatal("got DAD error: ", e.err) - } - if e.nicid != 1 { - t.Fatalf("got DAD event w/ nicid = %d, want = 1", e.nicid) - } - if e.addr != addr1 { - t.Fatalf("got DAD event w/ addr = %s, want = %s", addr, addr1) - } - if e.resolved { - t.Fatal("got DAD event w/ resolved = true, want = false") - } - } - addr, err = s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", addr, want) - } - }) - } -} - -// TestDADStop tests to make sure that the DAD process stops when an address is -// removed. -func TestDADStop(t *testing.T) { - ndpDisp := ndpDispatcher{ - dadC: make(chan ndpDADEvent), - } - ndpConfigs := stack.NDPConfigurations{ - RetransmitTimer: time.Second, - DupAddrDetectTransmits: 2, - } - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPDisp: &ndpDisp, - NDPConfigs: ndpConfigs, - } - - e := channel.New(10, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(_) = %s", err) - } - - if err := s.AddAddress(1, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(_, %d, %s) = %s", header.IPv6ProtocolNumber, addr1, err) - } - - // Address should not be considered bound to the NIC yet (DAD ongoing). - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", addr, want) - } - - // Remove the address. This should stop DAD. - if err := s.RemoveAddress(1, addr1); err != nil { - t.Fatalf("RemoveAddress(_, %s) = %s", addr1, err) - } - - // 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 e.err != nil { - t.Fatal("got DAD error: ", e.err) - } - if e.nicid != 1 { - t.Fatalf("got DAD event w/ nicid = %d, want = 1", e.nicid) - } - if e.addr != addr1 { - t.Fatalf("got DAD event w/ addr = %s, want = %s", addr, addr1) - } - if e.resolved { - t.Fatal("got DAD event w/ resolved = true, want = false") - } - - } - addr, err = s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", addr, want) - } - - // Should not have sent more than 1 NS message. - if got := s.Stats().ICMP.V6PacketsSent.NeighborSolicit.Value(); got > 1 { - t.Fatalf("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) { - 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), - } - e := channel.New(10, 1280, linkAddr1) - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - NDPDisp: &ndpDisp, - }) - - // This NIC(1)'s NDP configurations will be updated to - // be different from the default. - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(1) = %s", 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(2, e); err != nil { - t.Fatalf("CreateNIC(2) = %s", err) - } - - // Update the NDP configurations on NIC(1) to use DAD. - configs := stack.NDPConfigurations{ - DupAddrDetectTransmits: test.dupAddrDetectTransmits, - RetransmitTimer: test.retransmitTimer, - } - if err := s.SetNDPConfigurations(1, configs); err != nil { - t.Fatalf("got SetNDPConfigurations(1, _) = %s", 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(3, e); err != nil { - t.Fatalf("CreateNIC(3) = %s", err) - } - - // Add addresses for each NIC. - if err := s.AddAddress(1, header.IPv6ProtocolNumber, addr1); err != nil { - t.Fatalf("AddAddress(1, %d, %s) = %s", header.IPv6ProtocolNumber, addr1, err) - } - if err := s.AddAddress(2, header.IPv6ProtocolNumber, addr2); err != nil { - t.Fatalf("AddAddress(2, %d, %s) = %s", header.IPv6ProtocolNumber, addr2, err) - } - if err := s.AddAddress(3, header.IPv6ProtocolNumber, addr3); err != nil { - t.Fatalf("AddAddress(3, %d, %s) = %s", header.IPv6ProtocolNumber, addr3, err) - } - - // Address should not be considered bound to NIC(1) yet - // (DAD ongoing). - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", 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(2, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(2, _) err = %s", err) - } - if addr.Address != addr2 { - t.Fatalf("got stack.GetMainNICAddress(2, _) = %s, want = %s", addr, addr2) - } - addr, err = s.GetMainNICAddress(3, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(3, _) err = %s", err) - } - if addr.Address != addr3 { - t.Fatalf("got stack.GetMainNICAddress(3, _) = %s, want = %s", 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(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", 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 e.err != nil { - t.Fatal("got DAD error: ", e.err) - } - if e.nicid != 1 { - t.Fatalf("got DAD event w/ nicid = %d, want = 1", e.nicid) - } - if e.addr != addr1 { - t.Fatalf("got DAD event w/ addr = %s, want = %s", addr, addr1) - } - if !e.resolved { - t.Fatal("got DAD event w/ resolved = false, want = true") - } - } - addr, err = s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(1, _) err = %s", err) - } - if addr.Address != addr1 { - t.Fatalf("got stack.GetMainNICAddress(1, _) = %s, want = %s", addr, addr1) - } - }) - } -} diff --git a/pkg/tcpip/stack/stack_state_autogen.go b/pkg/tcpip/stack/stack_state_autogen.go new file mode 100755 index 000000000..2551126f2 --- /dev/null +++ b/pkg/tcpip/stack/stack_state_autogen.go @@ -0,0 +1,125 @@ +// 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 *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("endpointsArr", &x.endpointsArr) + m.Save("endpointsMap", &x.endpointsMap) + m.Save("reuse", &x.reuse) +} + +func (x *multiPortEndpoint) afterLoad() {} +func (x *multiPortEndpoint) load(m state.Map) { + m.Load("endpointsArr", &x.endpointsArr) + m.Load("endpointsMap", &x.endpointsMap) + m.Load("reuse", &x.reuse) +} + +func init() { + state.Register("stack.linkAddrEntryList", (*linkAddrEntryList)(nil), state.Fns{Save: (*linkAddrEntryList).save, Load: (*linkAddrEntryList).load}) + state.Register("stack.linkAddrEntryEntry", (*linkAddrEntryEntry)(nil), state.Fns{Save: (*linkAddrEntryEntry).save, Load: (*linkAddrEntryEntry).load}) + state.Register("stack.TransportEndpointID", (*TransportEndpointID)(nil), state.Fns{Save: (*TransportEndpointID).save, Load: (*TransportEndpointID).load}) + state.Register("stack.GSOType", (*GSOType)(nil), state.Fns{Save: (*GSOType).save, Load: (*GSOType).load}) + state.Register("stack.GSO", (*GSO)(nil), state.Fns{Save: (*GSO).save, Load: (*GSO).load}) + state.Register("stack.TransportEndpointInfo", (*TransportEndpointInfo)(nil), state.Fns{Save: (*TransportEndpointInfo).save, Load: (*TransportEndpointInfo).load}) + state.Register("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 9dae853d0..000000000 --- a/pkg/tcpip/stack/stack_test.go +++ /dev/null @@ -1,2168 +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/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/ipv6" - "gvisor.dev/gvisor/pkg/tcpip/stack" -) - -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 -) - -// 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, vv buffer.VectorisedView) { - // Increment the received packet count in the protocol descriptor. - f.proto.packetCount[int(f.id.LocalAddress[0])%len(f.proto.packetCount)]++ - - // Consume the network header. - b := vv.First() - vv.TrimFront(fakeNetHeaderLen) - - // Handle control packets. - if b[2] == uint8(fakeControlProtocol) { - nb := vv.First() - if len(nb) < fakeNetHeaderLen { - return - } - - vv.TrimFront(fakeNetHeaderLen) - f.dispatcher.DeliverTransportControlPacket(tcpip.Address(nb[1:2]), tcpip.Address(nb[0:1]), fakeNetNumber, tcpip.TransportProtocolNumber(nb[2]), stack.ControlPortUnreachable, 0, vv) - return - } - - // Dispatch the packet to the transport protocol. - f.dispatcher.DeliverTransportPacket(r, tcpip.TransportProtocolNumber(b[2]), buffer.View([]byte{}), vv) -} - -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) WritePacket(r *stack.Route, gso *stack.GSO, hdr buffer.Prependable, payload buffer.VectorisedView, params stack.NetworkHeaderParams, loop stack.PacketLooping) *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. - b := hdr.Prepend(fakeNetHeaderLen) - b[0] = r.RemoteAddress[0] - b[1] = f.id.LocalAddress[0] - b[2] = byte(params.Protocol) - - if loop&stack.PacketLoop != 0 { - views := make([]buffer.View, 1, 1+len(payload.Views())) - views[0] = hdr.View() - views = append(views, payload.Views()...) - vv := buffer.NewVectorisedView(len(views[0])+payload.Size(), views) - f.HandlePacket(r, vv) - } - if loop&stack.PacketOut == 0 { - return nil - } - - return f.ep.WritePacket(r, gso, hdr, payload, fakeNetNumber) -} - -// WritePackets implements stack.LinkEndpoint.WritePackets. -func (f *fakeNetworkEndpoint) WritePackets(r *stack.Route, gso *stack.GSO, hdrs []stack.PacketDescriptor, payload buffer.VectorisedView, params stack.NetworkHeaderParams, loop stack.PacketLooping) (int, *tcpip.Error) { - panic("not implemented") -} - -func (*fakeNetworkEndpoint) WriteHeaderIncludedPacket(r *stack.Route, payload buffer.VectorisedView, loop stack.PacketLooping) *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[1:2]), tcpip.Address(v[0:1]) -} - -func (f *fakeNetworkProtocol) NewEndpoint(nicid tcpip.NICID, addrWithPrefix tcpip.AddressWithPrefix, linkAddrCache stack.LinkAddressCache, dispatcher stack.TransportDispatcher, ep stack.LinkEndpoint) (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 - } -} - -func fakeNetFactory() stack.NetworkProtocol { - return &fakeNetworkProtocol{} -} - -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[0] = 3 - ep.Inject(fakeNetNumber, 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[0] = 1 - ep.Inject(fakeNetNumber, 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[0] = 2 - ep.Inject(fakeNetNumber, 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.Inject(fakeNetNumber-1, 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.Inject(fakeNetNumber, 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 */, hdr, payload.ToVectorisedView(), stack.NetworkHeaderParams{Protocol: fakeTransNumber, TTL: 123, TOS: stack.DefaultTOS}) -} - -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.Inject(fakeNetNumber, 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) - } -} - -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[0] = 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[0] = 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[0] = 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[0] = 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, %s) failed: %s", protoAddr, err) - } - r, err := s.FindRoute(1, header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, false /* multicastLoop */) - if err != nil { - t.Fatalf("FindRoute(1, %s, %s, %d) failed: %s", header.IPv4Any, header.IPv4Broadcast, fakeNetNumber, err) - } - if err := verifyRoute(r, stack.Route{LocalAddress: header.IPv4Any, RemoteAddress: header.IPv4Broadcast}); err != nil { - t.Errorf("FindRoute(1, %s, %s, %d) returned unexpected Route: %s)", 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, %s, %s, %d) = %s want = %s", 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, %s) failed: %s", nic1ProtoAddr, err) - } - - nic2ProtoAddr := tcpip.ProtocolAddress{fakeNetNumber, nic2Addr} - if err := s.AddProtocolAddress(2, nic2ProtoAddr); err != nil { - t.Fatalf("AddAddress(2, %s) failed: %s", 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, %s, %s, %d) failed: %s", nic1Addr.Address, header.IPv4Broadcast, fakeNetNumber, err) - } - if err := verifyRoute(r, stack.Route{LocalAddress: nic1Addr.Address, RemoteAddress: header.IPv4Broadcast}); err != nil { - t.Errorf("FindRoute(1, %s, %s, %d) returned unexpected Route: %s)", 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[0] = 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[0] = 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 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.Inject(fakeNetNumber, 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) { - // Create a stack with the fake network protocol, two NICs, each with - // an address. - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{fakeNetFactory()}, - }) - s.SetForwarding(true) - - ep1 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(1, ep1); err != nil { - t.Fatal("CreateNIC #1 failed:", err) - } - if err := s.AddAddress(1, fakeNetNumber, "\x01"); err != nil { - t.Fatal("AddAddress #1 failed:", err) - } - - ep2 := channel.New(10, defaultMTU, "") - if err := s.CreateNIC(2, ep2); err != nil { - t.Fatal("CreateNIC #2 failed:", err) - } - if err := s.AddAddress(2, fakeNetNumber, "\x02"); err != nil { - t.Fatal("AddAddress #2 failed:", err) - } - - // Route all packets to address 3 to NIC 2. - { - subnet, err := tcpip.NewSubnet("\x03", "\xff") - if err != nil { - t.Fatal(err) - } - s.SetRouteTable([]tcpip.Route{{Destination: subnet, Gateway: "\x00", NIC: 2}}) - } - - // Send a packet to address 3. - buf := buffer.NewView(30) - buf[0] = 3 - ep1.Inject(fakeNetNumber, buf.ToVectorisedView()) - - select { - case <-ep2.C: - default: - t.Fatal("Packet not forwarded") - } - - // Test that forwarding increments Tx stats correctly. - if got, want := s.NICInfo()[2].Stats.Tx.Packets.Value(), uint64(1); got != want { - t.Errorf("got Tx.Packets.Value() = %d, want = %d", got, want) - } - - if got, want := s.NICInfo()[2].Stats.Tx.Bytes.Value(), uint64(len(buf)); got != want { - t.Errorf("got Tx.Bytes.Value() = %d, want = %d", got, want) - } -} - -// TestNICAutoGenAddr tests the auto-generation of IPv6 link-local addresses -// (or lack there-of if disabled (default)). Note, DAD will be disabled in -// these tests. -func TestNICAutoGenAddr(t *testing.T) { - tests := []struct { - name string - autoGen bool - linkAddr tcpip.LinkAddress - shouldGen bool - }{ - { - "Disabled", - false, - linkAddr1, - false, - }, - { - "Enabled", - true, - linkAddr1, - true, - }, - { - "Nil MAC", - true, - tcpip.LinkAddress([]byte(nil)), - false, - }, - { - "Empty MAC", - true, - tcpip.LinkAddress(""), - false, - }, - { - "Invalid MAC", - true, - tcpip.LinkAddress("\x01\x02\x03"), - false, - }, - { - "Multicast MAC", - true, - tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06"), - false, - }, - { - "Unspecified MAC", - true, - tcpip.LinkAddress("\x00\x00\x00\x00\x00\x00"), - false, - }, - } - - for _, test := range tests { - t.Run(test.name, func(t *testing.T) { - opts := stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()}, - } - - if test.autoGen { - // Only set opts.AutoGenIPv6LinkLocal when - // test.autoGen is true because - // opts.AutoGenIPv6LinkLocal should be false by - // default. - opts.AutoGenIPv6LinkLocal = true - } - - e := channel.New(10, 1280, test.linkAddr) - s := stack.New(opts) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(_) = %s", err) - } - - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err) - } - - if test.shouldGen { - // Should have auto-generated an address and - // resolved immediately (DAD is disabled). - if want := (tcpip.AddressWithPrefix{Address: header.LinkLocalAddr(test.linkAddr), PrefixLen: header.IPv6LinkLocalPrefix.PrefixLen}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", addr, want) - } - } else { - // Should not have auto-generated an address. - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", 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) { - 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(10, 1280, linkAddr1) - s := stack.New(opts) - if err := s.CreateNIC(1, e); err != nil { - t.Fatalf("CreateNIC(_) = %s", err) - } - - // Address should not be considered bound to the - // NIC yet (DAD ongoing). - addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (_, %v), want = (_, nil)", err) - } - if want := (tcpip.AddressWithPrefix{}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", 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 e.err != nil { - t.Fatal("got DAD error: ", e.err) - } - if e.nicid != 1 { - t.Fatalf("got DAD event w/ nicid = %d, want = 1", e.nicid) - } - if e.addr != linkLocalAddr { - t.Fatalf("got DAD event w/ addr = %s, want = %s", addr, linkLocalAddr) - } - if !e.resolved { - t.Fatal("got DAD event w/ resolved = false, want = true") - } - } - addr, err = s.GetMainNICAddress(1, header.IPv6ProtocolNumber) - if err != nil { - t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err) - } - if want := (tcpip.AddressWithPrefix{Address: linkLocalAddr, PrefixLen: header.IPv6LinkLocalPrefix.PrefixLen}); addr != want { - t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", 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:", 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.Fatal("FindRoute failed:", err) - } - defer r.Release() - if err := s.RemoveAddress(1, "\x01"); err != nil { - t.Fatalf("RemoveAddress failed:", 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.Fatal("AddAddressWithOptions failed:", 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.Fatal("AddAddressWithOptions failed:", 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:", err) - } - addr, err = s.GetMainNICAddress(1, fakeNetNumber) - if err != nil { - t.Fatal("s.GetMainNICAddress failed:", 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) - } - } - }) - } - } -} diff --git a/pkg/tcpip/stack/transport_demuxer_test.go b/pkg/tcpip/stack/transport_demuxer_test.go deleted file mode 100644 index 210233dc0..000000000 --- a/pkg/tcpip/stack/transport_demuxer_test.go +++ /dev/null @@ -1,352 +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/stack" - "gvisor.dev/gvisor/pkg/tcpip/transport/udp" - "gvisor.dev/gvisor/pkg/waiter" -) - -const ( - 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" - - stackAddr = "\x0a\x00\x00\x01" - stackPort = 1234 - testPort = 4096 -) - -type testContext struct { - t *testing.T - linkEPs map[string]*channel.Endpoint - s *stack.Stack - - ep tcpip.Endpoint - wq waiter.Queue -} - -func (c *testContext) cleanup() { - if c.ep != nil { - c.ep.Close() - } -} - -func (c *testContext) createV6Endpoint(v6only bool) { - var err *tcpip.Error - c.ep, err = c.s.NewEndpoint(udp.ProtocolNumber, ipv6.ProtocolNumber, &c.wq) - if err != nil { - c.t.Fatalf("NewEndpoint failed: %v", err) - } - - var v tcpip.V6OnlyOption - if v6only { - v = 1 - } - if err := c.ep.SetSockOpt(v); err != nil { - c.t.Fatalf("SetSockOpt failed: %v", err) - } -} - -// newDualTestContextMultiNic creates the testing context and also linkEpNames -// named NICs. -func newDualTestContextMultiNic(t *testing.T, mtu uint32, linkEpNames []string) *testContext { - s := stack.New(stack.Options{ - NetworkProtocols: []stack.NetworkProtocol{ipv4.NewProtocol(), ipv6.NewProtocol()}, - TransportProtocols: []stack.TransportProtocol{udp.NewProtocol()}}) - linkEPs := make(map[string]*channel.Endpoint) - for i, linkEpName := range linkEpNames { - channelEP := channel.New(256, mtu, "") - nicid := tcpip.NICID(i + 1) - if err := s.CreateNamedNIC(nicid, linkEpName, channelEP); err != nil { - t.Fatalf("CreateNIC failed: %v", err) - } - linkEPs[linkEpName] = channelEP - - if err := s.AddAddress(nicid, ipv4.ProtocolNumber, stackAddr); err != nil { - t.Fatalf("AddAddress IPv4 failed: %v", err) - } - - if err := s.AddAddress(nicid, ipv6.ProtocolNumber, stackV6Addr); err != nil { - t.Fatalf("AddAddress IPv6 failed: %v", err) - } - } - - s.SetRouteTable([]tcpip.Route{ - { - Destination: header.IPv4EmptySubnet, - NIC: 1, - }, - { - Destination: header.IPv6EmptySubnet, - NIC: 1, - }, - }) - - return &testContext{ - t: t, - s: s, - linkEPs: linkEPs, - } -} - -type headers struct { - srcPort uint16 - 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) sendV6Packet(payload []byte, h *headers, linkEpName string) { - // 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: testV6Addr, - DstAddr: stackV6Addr, - }) - - // 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, testV6Addr, stackV6Addr, uint16(len(u))) - - // Calculate the UDP checksum and set it. - xsum = header.Checksum(payload, xsum) - u.SetChecksum(^u.CalculateChecksum(xsum)) - - // Inject packet. - c.linkEPs[linkEpName].Inject(ipv6.ProtocolNumber, buf.ToVectorisedView()) -} - -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()}}) - if got, want := s.RegisterTransportEndpoint(0, []tcpip.NetworkProtocolNumber{test.proto}, udp.ProtocolNumber, stack.TransportEndpointID{}, nil, false, 0), test.want; got != want { - t.Fatalf("s.RegisterTransportEndpoint(...) = %v, want %v", got, want) - } - }) - } -} - -// TestReuseBindToDevice injects varied packets on input devices and checks that -// the distribution of packets received matches expectations. -func TestDistribution(t *testing.T) { - type endpointSockopts struct { - reuse int - bindToDevice string - } - for _, test := range []struct { - name string - // endpoints will received the inject packets. - endpoints []endpointSockopts - // wantedDistribution is the wanted ratio of packets received on each - // endpoint for each NIC on which packets are injected. - wantedDistributions map[string][]float64 - }{ - { - "BindPortReuse", - // 5 endpoints that all have reuse set. - []endpointSockopts{ - endpointSockopts{1, ""}, - endpointSockopts{1, ""}, - endpointSockopts{1, ""}, - endpointSockopts{1, ""}, - endpointSockopts{1, ""}, - }, - map[string][]float64{ - // Injected packets on dev0 get distributed evenly. - "dev0": []float64{0.2, 0.2, 0.2, 0.2, 0.2}, - }, - }, - { - "BindToDevice", - // 3 endpoints with various bindings. - []endpointSockopts{ - endpointSockopts{0, "dev0"}, - endpointSockopts{0, "dev1"}, - endpointSockopts{0, "dev2"}, - }, - map[string][]float64{ - // Injected packets on dev0 go only to the endpoint bound to dev0. - "dev0": []float64{1, 0, 0}, - // Injected packets on dev1 go only to the endpoint bound to dev1. - "dev1": []float64{0, 1, 0}, - // Injected packets on dev2 go only to the endpoint bound to dev2. - "dev2": []float64{0, 0, 1}, - }, - }, - { - "ReuseAndBindToDevice", - // 6 endpoints with various bindings. - []endpointSockopts{ - endpointSockopts{1, "dev0"}, - endpointSockopts{1, "dev0"}, - endpointSockopts{1, "dev1"}, - endpointSockopts{1, "dev1"}, - endpointSockopts{1, "dev1"}, - endpointSockopts{1, ""}, - }, - map[string][]float64{ - // Injected packets on dev0 get distributed among endpoints bound to - // dev0. - "dev0": []float64{0.5, 0.5, 0, 0, 0, 0}, - // Injected packets on dev1 get distributed among endpoints bound to - // dev1 or unbound. - "dev1": []float64{0, 0, 1. / 3, 1. / 3, 1. / 3, 0}, - // Injected packets on dev999 go only to the unbound. - "dev999": []float64{0, 0, 0, 0, 0, 1}, - }, - }, - } { - t.Run(test.name, func(t *testing.T) { - for device, wantedDistribution := range test.wantedDistributions { - t.Run(device, func(t *testing.T) { - var devices []string - for d := range test.wantedDistributions { - devices = append(devices, d) - } - c := newDualTestContextMultiNic(t, defaultMTU, devices) - defer c.cleanup() - - c.createV6Endpoint(false) - - 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, ipv6.ProtocolNumber, &wq) - if err != nil { - c.t.Fatalf("NewEndpoint failed: %v", err) - } - eps[ep] = i - - go func(ep tcpip.Endpoint) { - for range ch { - pollChannel <- ep - } - }(ep) - - defer ep.Close() - reusePortOption := tcpip.ReusePortOption(endpoint.reuse) - if err := ep.SetSockOpt(reusePortOption); err != nil { - c.t.Fatalf("SetSockOpt(%#v) on endpoint %d failed: %v", reusePortOption, i, err) - } - bindToDeviceOption := tcpip.BindToDeviceOption(endpoint.bindToDevice) - if err := ep.SetSockOpt(bindToDeviceOption); err != nil { - c.t.Fatalf("SetSockOpt(%#v) on endpoint %d failed: %v", bindToDeviceOption, i, err) - } - if err := ep.Bind(tcpip.FullAddress{Addr: stackV6Addr, Port: stackPort}); err != nil { - t.Fatalf("ep.Bind(...) on endpoint %d failed: %v", i, err) - } - } - - npackets := 100000 - nports := 10000 - if got, want := len(test.endpoints), len(wantedDistribution); 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() - c.sendV6Packet(payload, - &headers{ - srcPort: testPort + port, - dstPort: stackPort}, - device) - - var addr tcpip.FullAddress - ep := <-pollChannel - _, _, err := ep.Read(&addr) - if err != nil { - c.t.Fatalf("Read on endpoint %d failed: %v", 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 { - wantedRatio := wantedDistribution[i] - wantedRecv := wantedRatio * float64(npackets) - actualRecv := stats[ep] - actualRatio := float64(stats[ep]) / float64(npackets) - // The deviation is less than 10%. - if math.Abs(actualRatio-wantedRatio) > 0.05 { - t.Errorf("wanted about %.0f%% (%.0f of %d) packets to arrive on endpoint %d, got %.0f%% (%d of %d)", wantedRatio*100, wantedRecv, 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 203e79f56..000000000 --- a/pkg/tcpip/stack/transport_test.go +++ /dev/null @@ -1,612 +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/iptables" - "gvisor.dev/gvisor/pkg/tcpip/link/channel" - "gvisor.dev/gvisor/pkg/tcpip/link/loopback" - "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 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) 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())) - v, err := p.FullPayload() - if err != nil { - return 0, nil, err - } - if err := f.route.WritePacket(nil /* gso */, hdr, buffer.View(v).ToVectorisedView(), stack.NetworkHeaderParams{Protocol: fakeTransNumber, TTL: 123, TOS: stack.DefaultTOS}); 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 -} - -// SetSockOptInt sets a socket option. Currently not supported. -func (*fakeTransportEndpoint) SetSockOptInt(tcpip.SockOpt, int) *tcpip.Error { - return tcpip.ErrInvalidEndpointState -} - -// GetSockOptInt implements tcpip.Endpoint.GetSockOptInt. -func (*fakeTransportEndpoint) GetSockOptInt(opt tcpip.SockOpt) (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, false /* reuse */, 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, - false, /* reuse */ - 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, _ buffer.VectorisedView) { - // 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, buffer.VectorisedView) { - // 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() (iptables.IPTables, error) { - return iptables.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 (f *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, buffer.View, buffer.VectorisedView) 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 - } -} - -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.Inject(fakeNetNumber, 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.Inject(fakeNetNumber, 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.Inject(fakeNetNumber, 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.Inject(fakeNetNumber, 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.Inject(fakeNetNumber, 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.Inject(fakeNetNumber, 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.Inject(fakeNetNumber, 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) - } - - var p channel.PacketInfo - select { - case p = <-ep2.C: - default: - t.Fatal("Response packet not forwarded") - } - - if dst := p.Header[0]; dst != 3 { - t.Errorf("Response packet has incorrect destination addresss: got = %d, want = 3", dst) - } - if src := p.Header[1]; src != 1 { - t.Errorf("Response packet has incorrect source addresss: got = %d, want = 3", src) - } -} |