summaryrefslogtreecommitdiffhomepage
path: root/pkg/tcpip
diff options
context:
space:
mode:
Diffstat (limited to 'pkg/tcpip')
-rw-r--r--pkg/tcpip/adapters/gonet/BUILD1
-rw-r--r--pkg/tcpip/adapters/gonet/gonet_test.go3
-rw-r--r--pkg/tcpip/transport/tcp/connect.go13
-rw-r--r--pkg/tcpip/transport/tcp/endpoint.go47
-rw-r--r--pkg/tcpip/transport/tcp/endpoint_state.go10
-rw-r--r--pkg/tcpip/transport/tcp/tcp_test.go14
-rw-r--r--pkg/tcpip/transport/udp/BUILD1
-rw-r--r--pkg/tcpip/transport/udp/endpoint.go29
-rw-r--r--pkg/tcpip/transport/udp/udp_test.go50
9 files changed, 127 insertions, 41 deletions
diff --git a/pkg/tcpip/adapters/gonet/BUILD b/pkg/tcpip/adapters/gonet/BUILD
index a984f1712..d69b1e081 100644
--- a/pkg/tcpip/adapters/gonet/BUILD
+++ b/pkg/tcpip/adapters/gonet/BUILD
@@ -26,6 +26,7 @@ go_test(
"//pkg/tcpip",
"//pkg/tcpip/header",
"//pkg/tcpip/link/loopback",
+ "//pkg/tcpip/link/sniffer",
"//pkg/tcpip/network/ipv4",
"//pkg/tcpip/network/ipv6",
"//pkg/tcpip/stack",
diff --git a/pkg/tcpip/adapters/gonet/gonet_test.go b/pkg/tcpip/adapters/gonet/gonet_test.go
index b196324c7..4b6bf4bba 100644
--- a/pkg/tcpip/adapters/gonet/gonet_test.go
+++ b/pkg/tcpip/adapters/gonet/gonet_test.go
@@ -28,6 +28,7 @@ import (
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/loopback"
+ "gvisor.dev/gvisor/pkg/tcpip/link/sniffer"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
"gvisor.dev/gvisor/pkg/tcpip/stack"
@@ -65,7 +66,7 @@ func newLoopbackStack() (*stack.Stack, *tcpip.Error) {
TransportProtocols: []stack.TransportProtocolFactory{tcp.NewProtocol, udp.NewProtocol},
})
- if err := s.CreateNIC(NICID, loopback.New()); err != nil {
+ if err := s.CreateNIC(NICID, sniffer.New(loopback.New())); err != nil {
return nil, err
}
diff --git a/pkg/tcpip/transport/tcp/connect.go b/pkg/tcpip/transport/tcp/connect.go
index ac6d879a7..6661e8915 100644
--- a/pkg/tcpip/transport/tcp/connect.go
+++ b/pkg/tcpip/transport/tcp/connect.go
@@ -496,7 +496,7 @@ func (h *handshake) resolveRoute() *tcpip.Error {
h.ep.mu.Lock()
}
if n&notifyError != 0 {
- return h.ep.LastError()
+ return h.ep.lastErrorLocked()
}
}
@@ -575,7 +575,6 @@ func (h *handshake) complete() *tcpip.Error {
return err
}
defer timer.stop()
-
for h.state != handshakeCompleted {
// Unlock before blocking, and reacquire again afterwards (h.ep.mu is held
// throughout handshake processing).
@@ -631,9 +630,8 @@ func (h *handshake) complete() *tcpip.Error {
h.ep.mu.Lock()
}
if n&notifyError != 0 {
- return h.ep.LastError()
+ return h.ep.lastErrorLocked()
}
-
case wakerForNewSegment:
if err := h.processSegments(); err != nil {
return err
@@ -1002,7 +1000,7 @@ func (e *endpoint) resetConnectionLocked(err *tcpip.Error) {
// Only send a reset if the connection is being aborted for a reason
// other than receiving a reset.
e.setEndpointState(StateError)
- e.HardError = err
+ e.hardError = err
if err != tcpip.ErrConnectionReset && err != tcpip.ErrTimeout {
// The exact sequence number to be used for the RST is the same as the
// one used by Linux. We need to handle the case of window being shrunk
@@ -1141,7 +1139,7 @@ func (e *endpoint) handleReset(s *segment) (ok bool, err *tcpip.Error) {
// delete the TCB, and return.
case StateCloseWait:
e.transitionToStateCloseLocked()
- e.HardError = tcpip.ErrAborted
+ e.hardError = tcpip.ErrAborted
e.notifyProtocolGoroutine(notifyTickleWorker)
return false, nil
default:
@@ -1353,7 +1351,6 @@ func (e *endpoint) protocolMainLoop(handshake bool, wakerInitDone chan<- struct{
epilogue := func() {
// e.mu is expected to be hold upon entering this section.
-
if e.snd != nil {
e.snd.resendTimer.cleanup()
}
@@ -1383,7 +1380,7 @@ func (e *endpoint) protocolMainLoop(handshake bool, wakerInitDone chan<- struct{
e.lastErrorMu.Unlock()
e.setEndpointState(StateError)
- e.HardError = err
+ e.hardError = err
e.workerCleanup = true
// Lock released below.
diff --git a/pkg/tcpip/transport/tcp/endpoint.go b/pkg/tcpip/transport/tcp/endpoint.go
index 4f4f4c65e..a2161e49d 100644
--- a/pkg/tcpip/transport/tcp/endpoint.go
+++ b/pkg/tcpip/transport/tcp/endpoint.go
@@ -315,11 +315,6 @@ func (*Stats) IsEndpointStats() {}
// +stateify savable
type EndpointInfo struct {
stack.TransportEndpointInfo
-
- // HardError is meaningful only when state is stateError. It stores the
- // error to be returned when read/write syscalls are called and the
- // endpoint is in this state. HardError is protected by endpoint mu.
- HardError *tcpip.Error `state:".(string)"`
}
// IsEndpointInfo is an empty method to implement the tcpip.EndpointInfo
@@ -386,6 +381,11 @@ type endpoint struct {
waiterQueue *waiter.Queue `state:"wait"`
uniqueID uint64
+ // hardError is meaningful only when state is stateError. It stores the
+ // error to be returned when read/write syscalls are called and the
+ // endpoint is in this state. hardError is protected by endpoint mu.
+ hardError *tcpip.Error `state:".(string)"`
+
// lastError represents the last error that the endpoint reported;
// access to it is protected by the following mutex.
lastErrorMu sync.Mutex `state:"nosave"`
@@ -1283,7 +1283,15 @@ func (e *endpoint) SetOwner(owner tcpip.PacketOwner) {
e.owner = owner
}
-func (e *endpoint) LastError() *tcpip.Error {
+// Preconditions: e.mu must be held to call this function.
+func (e *endpoint) hardErrorLocked() *tcpip.Error {
+ err := e.hardError
+ e.hardError = nil
+ return err
+}
+
+// Preconditions: e.mu must be held to call this function.
+func (e *endpoint) lastErrorLocked() *tcpip.Error {
e.lastErrorMu.Lock()
defer e.lastErrorMu.Unlock()
err := e.lastError
@@ -1291,6 +1299,15 @@ func (e *endpoint) LastError() *tcpip.Error {
return err
}
+func (e *endpoint) LastError() *tcpip.Error {
+ e.LockUser()
+ defer e.UnlockUser()
+ if err := e.hardErrorLocked(); err != nil {
+ return err
+ }
+ return e.lastErrorLocked()
+}
+
// Read reads data from the endpoint.
func (e *endpoint) Read(*tcpip.FullAddress) (buffer.View, tcpip.ControlMessages, *tcpip.Error) {
e.LockUser()
@@ -1312,9 +1329,8 @@ func (e *endpoint) Read(*tcpip.FullAddress) (buffer.View, tcpip.ControlMessages,
bufUsed := e.rcvBufUsed
if s := e.EndpointState(); !s.connected() && s != StateClose && bufUsed == 0 {
e.rcvListMu.Unlock()
- he := e.HardError
if s == StateError {
- return buffer.View{}, tcpip.ControlMessages{}, he
+ return buffer.View{}, tcpip.ControlMessages{}, e.hardErrorLocked()
}
e.stats.ReadErrors.NotConnected.Increment()
return buffer.View{}, tcpip.ControlMessages{}, tcpip.ErrNotConnected
@@ -1370,9 +1386,13 @@ func (e *endpoint) readLocked() (buffer.View, *tcpip.Error) {
// indicating the reason why it's not writable.
// Caller must hold e.mu and e.sndBufMu
func (e *endpoint) isEndpointWritableLocked() (int, *tcpip.Error) {
+ // The endpoint cannot be written to if it's not connected.
switch s := e.EndpointState(); {
case s == StateError:
- return 0, e.HardError
+ if err := e.hardErrorLocked(); err != nil {
+ return 0, err
+ }
+ return 0, tcpip.ErrClosedForSend
case !s.connecting() && !s.connected():
return 0, tcpip.ErrClosedForSend
case s.connecting():
@@ -1486,7 +1506,7 @@ func (e *endpoint) Peek(vec [][]byte) (int64, tcpip.ControlMessages, *tcpip.Erro
// but has some pending unread data.
if s := e.EndpointState(); !s.connected() && s != StateClose {
if s == StateError {
- return 0, tcpip.ControlMessages{}, e.HardError
+ return 0, tcpip.ControlMessages{}, e.hardErrorLocked()
}
e.stats.ReadErrors.InvalidEndpointState.Increment()
return 0, tcpip.ControlMessages{}, tcpip.ErrInvalidEndpointState
@@ -2243,7 +2263,10 @@ func (e *endpoint) connect(addr tcpip.FullAddress, handshake bool, run bool) *tc
return tcpip.ErrAlreadyConnecting
case StateError:
- return e.HardError
+ if err := e.hardErrorLocked(); err != nil {
+ return err
+ }
+ return tcpip.ErrConnectionAborted
default:
return tcpip.ErrInvalidEndpointState
@@ -2417,7 +2440,7 @@ func (e *endpoint) startMainLoop(handshake bool) *tcpip.Error {
e.lastErrorMu.Unlock()
e.setEndpointState(StateError)
- e.HardError = err
+ e.hardError = err
// Call cleanupLocked to free up any reservations.
e.cleanupLocked()
diff --git a/pkg/tcpip/transport/tcp/endpoint_state.go b/pkg/tcpip/transport/tcp/endpoint_state.go
index bb901c0f8..ba67176b5 100644
--- a/pkg/tcpip/transport/tcp/endpoint_state.go
+++ b/pkg/tcpip/transport/tcp/endpoint_state.go
@@ -321,21 +321,21 @@ func (e *endpoint) loadRecentTSTime(unix unixTime) {
}
// saveHardError is invoked by stateify.
-func (e *EndpointInfo) saveHardError() string {
- if e.HardError == nil {
+func (e *endpoint) saveHardError() string {
+ if e.hardError == nil {
return ""
}
- return e.HardError.String()
+ return e.hardError.String()
}
// loadHardError is invoked by stateify.
-func (e *EndpointInfo) loadHardError(s string) {
+func (e *endpoint) loadHardError(s string) {
if s == "" {
return
}
- e.HardError = tcpip.StringToError(s)
+ e.hardError = tcpip.StringToError(s)
}
// saveMeasureTime is invoked by stateify.
diff --git a/pkg/tcpip/transport/tcp/tcp_test.go b/pkg/tcpip/transport/tcp/tcp_test.go
index 9f0fb41e3..c366a4cbc 100644
--- a/pkg/tcpip/transport/tcp/tcp_test.go
+++ b/pkg/tcpip/transport/tcp/tcp_test.go
@@ -75,9 +75,6 @@ func TestGiveUpConnect(t *testing.T) {
// Wait for ep to become writable.
<-notifyCh
- if err := ep.LastError(); err != tcpip.ErrAborted {
- t.Fatalf("got ep.LastError() = %s, want = %s", err, tcpip.ErrAborted)
- }
// Call Connect again to retreive the handshake failure status
// and stats updates.
@@ -3198,6 +3195,11 @@ loop:
case tcpip.ErrWouldBlock:
select {
case <-ch:
+ // Expect the state to be StateError and subsequent Reads to fail with HardError.
+ if _, _, err := c.EP.Read(nil); err != tcpip.ErrConnectionReset {
+ t.Fatalf("got c.EP.Read(nil) = %s, want = %s", err, tcpip.ErrConnectionReset)
+ }
+ break loop
case <-time.After(1 * time.Second):
t.Fatalf("Timed out waiting for reset to arrive")
}
@@ -3207,14 +3209,10 @@ loop:
t.Fatalf("got c.EP.Read(nil) = %s, want = %s", err, tcpip.ErrConnectionReset)
}
}
- // Expect the state to be StateError and subsequent Reads to fail with HardError.
- if _, _, err := c.EP.Read(nil); err != tcpip.ErrConnectionReset {
- t.Fatalf("got c.EP.Read(nil) = %s, want = %s", err, tcpip.ErrConnectionReset)
- }
+
if tcp.EndpointState(c.EP.State()) != tcp.StateError {
t.Fatalf("got EP state is not StateError")
}
-
if got := c.Stack().Stats().TCP.EstablishedResets.Value(); got != 1 {
t.Errorf("got stats.TCP.EstablishedResets.Value() = %d, want = 1", got)
}
diff --git a/pkg/tcpip/transport/udp/BUILD b/pkg/tcpip/transport/udp/BUILD
index c78549424..7ebae63d8 100644
--- a/pkg/tcpip/transport/udp/BUILD
+++ b/pkg/tcpip/transport/udp/BUILD
@@ -56,6 +56,7 @@ go_test(
"//pkg/tcpip/network/ipv4",
"//pkg/tcpip/network/ipv6",
"//pkg/tcpip/stack",
+ "//pkg/tcpip/transport/icmp",
"//pkg/waiter",
],
)
diff --git a/pkg/tcpip/transport/udp/endpoint.go b/pkg/tcpip/transport/udp/endpoint.go
index 57976d4e3..835dcc54e 100644
--- a/pkg/tcpip/transport/udp/endpoint.go
+++ b/pkg/tcpip/transport/udp/endpoint.go
@@ -429,7 +429,13 @@ func (e *endpoint) write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-c
to := opts.To
e.mu.RLock()
- defer e.mu.RUnlock()
+ lockReleased := false
+ defer func() {
+ if lockReleased {
+ return
+ }
+ e.mu.RUnlock()
+ }()
// If we've shutdown with SHUT_WR we are in an invalid state for sending.
if e.shutdownFlags&tcpip.ShutdownWrite != 0 {
@@ -475,7 +481,7 @@ func (e *endpoint) write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-c
if e.state != StateConnected {
err = tcpip.ErrInvalidEndpointState
}
- return
+ return ch, err
}
} else {
// Reject destination address if it goes through a different
@@ -541,7 +547,24 @@ func (e *endpoint) write(p tcpip.Payloader, opts tcpip.WriteOptions) (int64, <-c
useDefaultTTL = false
}
- if err := sendUDP(route, buffer.View(v).ToVectorisedView(), e.ID.LocalPort, dstPort, ttl, useDefaultTTL, e.sendTOS, e.owner, e.noChecksum); err != nil {
+ localPort := e.ID.LocalPort
+ sendTOS := e.sendTOS
+ owner := e.owner
+ noChecksum := e.noChecksum
+ lockReleased = true
+ e.mu.RUnlock()
+
+ // Do not hold lock when sending as loopback is synchronous and if the UDP
+ // datagram ends up generating an ICMP response then it can result in a
+ // deadlock where the ICMP response handling ends up acquiring this endpoint's
+ // mutex using e.mu.RLock() in endpoint.HandleControlPacket which can cause a
+ // deadlock if another caller is trying to acquire e.mu in exclusive mode w/
+ // e.mu.Lock(). Since e.mu.Lock() prevents any new read locks to ensure the
+ // lock can be eventually acquired.
+ //
+ // See: https://golang.org/pkg/sync/#RWMutex for details on why recursive read
+ // locking is prohibited.
+ if err := sendUDP(route, buffer.View(v).ToVectorisedView(), localPort, dstPort, ttl, useDefaultTTL, sendTOS, owner, noChecksum); err != nil {
return 0, nil, err
}
return int64(len(v)), nil, nil
diff --git a/pkg/tcpip/transport/udp/udp_test.go b/pkg/tcpip/transport/udp/udp_test.go
index 764ad0857..492e277a8 100644
--- a/pkg/tcpip/transport/udp/udp_test.go
+++ b/pkg/tcpip/transport/udp/udp_test.go
@@ -32,6 +32,7 @@ import (
"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/icmp"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
)
@@ -54,6 +55,7 @@ const (
stackPort = 1234
testAddr = "\x0a\x00\x00\x02"
testPort = 4096
+ invalidPort = 8192
multicastAddr = "\xe8\x2b\xd3\xea"
multicastV6Addr = "\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
broadcastAddr = header.IPv4Broadcast
@@ -295,7 +297,8 @@ func newDualTestContext(t *testing.T, mtu uint32) *testContext {
t.Helper()
return newDualTestContextWithOptions(t, mtu, stack.Options{
NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
- TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
+ TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol, icmp.NewProtocol6, icmp.NewProtocol4},
+ HandleLocal: true,
})
}
@@ -972,7 +975,7 @@ func testFailingWrite(c *testContext, flow testFlow, wantErr *tcpip.Error) {
// provided.
func testWrite(c *testContext, flow testFlow, checkers ...checker.NetworkChecker) uint16 {
c.t.Helper()
- return testWriteInternal(c, flow, true, checkers...)
+ return testWriteAndVerifyInternal(c, flow, true, checkers...)
}
// testWriteWithoutDestination sends a packet of the given test flow from the
@@ -981,10 +984,10 @@ func testWrite(c *testContext, flow testFlow, checkers ...checker.NetworkChecker
// checker functions provided.
func testWriteWithoutDestination(c *testContext, flow testFlow, checkers ...checker.NetworkChecker) uint16 {
c.t.Helper()
- return testWriteInternal(c, flow, false, checkers...)
+ return testWriteAndVerifyInternal(c, flow, false, checkers...)
}
-func testWriteInternal(c *testContext, flow testFlow, setDest bool, checkers ...checker.NetworkChecker) uint16 {
+func testWriteNoVerify(c *testContext, flow testFlow, setDest bool) buffer.View {
c.t.Helper()
// Take a snapshot of the stats to validate them at the end of the test.
epstats := c.ep.Stats().(*tcpip.TransportEndpointStats).Clone()
@@ -1006,6 +1009,12 @@ func testWriteInternal(c *testContext, flow testFlow, setDest bool, checkers ...
c.t.Fatalf("Bad number of bytes written: got %v, want %v", n, len(payload))
}
c.checkEndpointWriteStats(1, epstats, err)
+ return payload
+}
+
+func testWriteAndVerifyInternal(c *testContext, flow testFlow, setDest bool, checkers ...checker.NetworkChecker) uint16 {
+ c.t.Helper()
+ payload := testWriteNoVerify(c, flow, setDest)
// Received the packet and check the payload.
b := c.getPacketAndVerify(flow, checkers...)
var udp header.UDP
@@ -1150,6 +1159,39 @@ func TestV4WriteOnConnected(t *testing.T) {
testWriteWithoutDestination(c, unicastV4)
}
+func TestWriteOnConnectedInvalidPort(t *testing.T) {
+ protocols := map[string]tcpip.NetworkProtocolNumber{
+ "ipv4": ipv4.ProtocolNumber,
+ "ipv6": ipv6.ProtocolNumber,
+ }
+ for name, pn := range protocols {
+ t.Run(name, func(t *testing.T) {
+ c := newDualTestContext(t, defaultMTU)
+ defer c.cleanup()
+
+ c.createEndpoint(pn)
+ if err := c.ep.Connect(tcpip.FullAddress{Addr: stackAddr, Port: invalidPort}); err != nil {
+ c.t.Fatalf("Connect failed: %s", err)
+ }
+ writeOpts := tcpip.WriteOptions{
+ To: &tcpip.FullAddress{Addr: stackAddr, Port: invalidPort},
+ }
+ payload := buffer.View(newPayload())
+ n, _, err := c.ep.Write(tcpip.SlicePayload(payload), writeOpts)
+ if err != nil {
+ c.t.Fatalf("c.ep.Write(...) = %+s, want nil", err)
+ }
+ if got, want := n, int64(len(payload)); got != want {
+ c.t.Fatalf("c.ep.Write(...) wrote %d bytes, want %d bytes", got, want)
+ }
+
+ if err := c.ep.LastError(); err != tcpip.ErrConnectionRefused {
+ c.t.Fatalf("expected c.ep.LastError() == ErrConnectionRefused, got: %+v", err)
+ }
+ })
+ }
+}
+
// TestWriteOnBoundToV4Multicast checks that we can send packets out of a socket
// that is bound to a V4 multicast address.
func TestWriteOnBoundToV4Multicast(t *testing.T) {
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-23 19:00:08 +0000