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-rw-r--r--pkg/tcpip/stack/ndp.go210
-rw-r--r--pkg/tcpip/stack/ndp_test.go461
-rw-r--r--pkg/tcpip/stack/nic.go73
3 files changed, 663 insertions, 81 deletions
diff --git a/pkg/tcpip/stack/ndp.go b/pkg/tcpip/stack/ndp.go
index 7c9fc48d1..7f66c6c09 100644
--- a/pkg/tcpip/stack/ndp.go
+++ b/pkg/tcpip/stack/ndp.go
@@ -305,6 +305,15 @@ type NDPConfigurations struct {
// lifetime(s) of the generated address changes; this option only
// affects the generation of new addresses as part of SLAAC.
AutoGenGlobalAddresses bool
+
+ // AutoGenAddressConflictRetries determines how many times to attempt to retry
+ // generation of a permanent auto-generated address in response to DAD
+ // conflicts.
+ //
+ // If the method used to generate the address does not support creating
+ // alternative addresses (e.g. IIDs based on the modified EUI64 of a NIC's
+ // MAC address), then no attempt will be made to resolve the conflict.
+ AutoGenAddressConflictRetries uint8
}
// DefaultNDPConfigurations returns an NDPConfigurations populated with
@@ -411,8 +420,23 @@ type slaacPrefixState struct {
// Nonzero only when the address is not valid forever.
validUntil time.Time
+ // Nonzero only when the address is not preferred forever.
+ preferredUntil time.Time
+
// The prefix's permanent address endpoint.
+ //
+ // May only be nil when a SLAAC address is being (re-)generated. Otherwise,
+ // must not be nil as all SLAAC prefixes must have a SLAAC address.
ref *referencedNetworkEndpoint
+
+ // The number of times a permanent address has been generated for the prefix.
+ //
+ // Addresses may be regenerated in reseponse to a DAD conflicts.
+ generationAttempts uint8
+
+ // The maximum number of times to attempt regeneration of a permanent SLAAC
+ // address in response to DAD conflicts.
+ maxGenerationAttempts uint8
}
// startDuplicateAddressDetection performs Duplicate Address Detection.
@@ -935,60 +959,83 @@ func (ndp *ndpState) doSLAAC(prefix tcpip.Subnet, pl, vl time.Duration) {
return
}
- // If the preferred lifetime is zero, then the prefix should be considered
- // deprecated.
- deprecated := pl == 0
- ref := ndp.addSLAACAddr(prefix, deprecated)
- if ref == nil {
- // We were unable to generate a permanent address for prefix so do nothing
- // further as there is no reason to maintain state for a SLAAC prefix we
- // cannot generate a permanent address for.
- return
- }
-
state := slaacPrefixState{
deprecationTimer: tcpip.MakeCancellableTimer(&ndp.nic.mu, func() {
- prefixState, ok := ndp.slaacPrefixes[prefix]
+ state, ok := ndp.slaacPrefixes[prefix]
if !ok {
- panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for the SLAAC prefix %s", prefix))
+ panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for the deprecated SLAAC prefix %s", prefix))
}
- ndp.deprecateSLAACAddress(prefixState.ref)
+ ndp.deprecateSLAACAddress(state.ref)
}),
invalidationTimer: tcpip.MakeCancellableTimer(&ndp.nic.mu, func() {
- ndp.invalidateSLAACPrefix(prefix, true)
+ state, ok := ndp.slaacPrefixes[prefix]
+ if !ok {
+ panic(fmt.Sprintf("ndp: must have a slaacPrefixes entry for the invalidated SLAAC prefix %s", prefix))
+ }
+
+ ndp.invalidateSLAACPrefix(prefix, state)
}),
- ref: ref,
+ maxGenerationAttempts: ndp.configs.AutoGenAddressConflictRetries + 1,
+ }
+
+ now := time.Now()
+
+ // The time an address is preferred until is needed to properly generate the
+ // address.
+ if pl < header.NDPInfiniteLifetime {
+ state.preferredUntil = now.Add(pl)
+ }
+
+ if !ndp.generateSLAACAddr(prefix, &state) {
+ // We were unable to generate an address for the prefix, we do not nothing
+ // further as there is no reason to maintain state or timers for a prefix we
+ // do not have an address for.
+ return
}
// Setup the initial timers to deprecate and invalidate prefix.
- if !deprecated && pl < header.NDPInfiniteLifetime {
+ if pl < header.NDPInfiniteLifetime && pl != 0 {
state.deprecationTimer.Reset(pl)
}
if vl < header.NDPInfiniteLifetime {
state.invalidationTimer.Reset(vl)
- state.validUntil = time.Now().Add(vl)
+ state.validUntil = now.Add(vl)
}
ndp.slaacPrefixes[prefix] = state
}
-// addSLAACAddr adds a SLAAC address for prefix.
+// generateSLAACAddr generates a SLAAC address for prefix.
+//
+// Returns true if an address was successfully generated.
+//
+// Panics if the prefix is not a SLAAC prefix or it already has an address.
//
// The NIC that ndp belongs to MUST be locked.
-func (ndp *ndpState) addSLAACAddr(prefix tcpip.Subnet, deprecated bool) *referencedNetworkEndpoint {
+func (ndp *ndpState) generateSLAACAddr(prefix tcpip.Subnet, state *slaacPrefixState) bool {
+ if r := state.ref; r != nil {
+ panic(fmt.Sprintf("ndp: SLAAC prefix %s already has a permenant address %s", prefix, r.addrWithPrefix()))
+ }
+
+ // If we have already reached the maximum address generation attempts for the
+ // prefix, do not generate another address.
+ if state.generationAttempts == state.maxGenerationAttempts {
+ return false
+ }
+
addrBytes := []byte(prefix.ID())
if oIID := ndp.nic.stack.opaqueIIDOpts; oIID.NICNameFromID != nil {
addrBytes = header.AppendOpaqueInterfaceIdentifier(
addrBytes[:header.IIDOffsetInIPv6Address],
prefix,
oIID.NICNameFromID(ndp.nic.ID(), ndp.nic.name),
- 0, /* dadCounter */
+ state.generationAttempts,
oIID.SecretKey,
)
- } else {
+ } else if state.generationAttempts == 0 {
// Only attempt to generate an interface-specific IID if we have a valid
// link address.
//
@@ -996,12 +1043,16 @@ func (ndp *ndpState) addSLAACAddr(prefix tcpip.Subnet, deprecated bool) *referen
// LinkEndpoint.LinkAddress) before reaching this point.
linkAddr := ndp.nic.linkEP.LinkAddress()
if !header.IsValidUnicastEthernetAddress(linkAddr) {
- return nil
+ return false
}
// Generate an address within prefix from the modified EUI-64 of ndp's NIC's
// Ethernet MAC address.
header.EthernetAdddressToModifiedEUI64IntoBuf(linkAddr, addrBytes[header.IIDOffsetInIPv6Address:])
+ } else {
+ // We have no way to regenerate an address when addresses are not generated
+ // with opaque IIDs.
+ return false
}
generatedAddr := tcpip.ProtocolAddress{
@@ -1014,26 +1065,52 @@ func (ndp *ndpState) addSLAACAddr(prefix tcpip.Subnet, deprecated bool) *referen
// If the nic already has this address, do nothing further.
if ndp.nic.hasPermanentAddrLocked(generatedAddr.AddressWithPrefix.Address) {
- return nil
+ return false
}
// Inform the integrator that we have a new SLAAC address.
ndpDisp := ndp.nic.stack.ndpDisp
if ndpDisp == nil {
- return nil
+ return false
}
if !ndpDisp.OnAutoGenAddress(ndp.nic.ID(), generatedAddr.AddressWithPrefix) {
// Informed by the integrator not to add the address.
- return nil
+ return false
}
+ deprecated := time.Since(state.preferredUntil) >= 0
ref, err := ndp.nic.addAddressLocked(generatedAddr, FirstPrimaryEndpoint, permanent, slaac, deprecated)
if err != nil {
panic(fmt.Sprintf("ndp: error when adding address %+v: %s", generatedAddr, err))
}
- return ref
+ state.generationAttempts++
+ state.ref = ref
+ return true
+}
+
+// regenerateSLAACAddr regenerates an address for a SLAAC prefix.
+//
+// If generating a new address for the prefix fails, the prefix will be
+// invalidated.
+//
+// The NIC that ndp belongs to MUST be locked.
+func (ndp *ndpState) regenerateSLAACAddr(prefix tcpip.Subnet) {
+ state, ok := ndp.slaacPrefixes[prefix]
+ if !ok {
+ panic(fmt.Sprintf("ndp: SLAAC prefix state not found to regenerate address for %s", prefix))
+ }
+
+ if ndp.generateSLAACAddr(prefix, &state) {
+ ndp.slaacPrefixes[prefix] = state
+ return
+ }
+
+ // We were unable to generate a permanent address for the SLAAC prefix so
+ // invalidate the prefix as there is no reason to maintain state for a
+ // SLAAC prefix we do not have an address for.
+ ndp.invalidateSLAACPrefix(prefix, state)
}
// refreshSLAACPrefixLifetimes refreshes the lifetimes of a SLAAC prefix.
@@ -1060,9 +1137,16 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, pl, vl tim
// deprecation timer so it can be reset.
prefixState.deprecationTimer.StopLocked()
+ now := time.Now()
+
// Reset the deprecation timer if prefix has a finite preferred lifetime.
- if !deprecated && pl < header.NDPInfiniteLifetime {
- prefixState.deprecationTimer.Reset(pl)
+ if pl < header.NDPInfiniteLifetime {
+ if !deprecated {
+ prefixState.deprecationTimer.Reset(pl)
+ }
+ prefixState.preferredUntil = now.Add(pl)
+ } else {
+ prefixState.preferredUntil = time.Time{}
}
// As per RFC 4862 section 5.5.3.e, update the valid lifetime for prefix:
@@ -1105,7 +1189,7 @@ func (ndp *ndpState) refreshSLAACPrefixLifetimes(prefix tcpip.Subnet, pl, vl tim
prefixState.invalidationTimer.StopLocked()
prefixState.invalidationTimer.Reset(effectiveVl)
- prefixState.validUntil = time.Now().Add(effectiveVl)
+ prefixState.validUntil = now.Add(effectiveVl)
}
// deprecateSLAACAddress marks ref as deprecated and notifies the stack's NDP
@@ -1121,48 +1205,60 @@ func (ndp *ndpState) deprecateSLAACAddress(ref *referencedNetworkEndpoint) {
ref.deprecated = true
if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil {
- ndpDisp.OnAutoGenAddressDeprecated(ndp.nic.ID(), tcpip.AddressWithPrefix{
- Address: ref.ep.ID().LocalAddress,
- PrefixLen: ref.ep.PrefixLen(),
- })
+ ndpDisp.OnAutoGenAddressDeprecated(ndp.nic.ID(), ref.addrWithPrefix())
}
}
// invalidateSLAACPrefix invalidates a SLAAC prefix.
//
// The NIC that ndp belongs to MUST be locked.
-func (ndp *ndpState) invalidateSLAACPrefix(prefix tcpip.Subnet, removeAddr bool) {
- state, ok := ndp.slaacPrefixes[prefix]
- if !ok {
- return
+func (ndp *ndpState) invalidateSLAACPrefix(prefix tcpip.Subnet, state slaacPrefixState) {
+ if r := state.ref; r != nil {
+ // Since we are already invalidating the prefix, do not invalidate the
+ // prefix when removing the address.
+ if err := ndp.nic.removePermanentIPv6EndpointLocked(r, false /* allowSLAACPrefixInvalidation */); err != nil {
+ panic(fmt.Sprintf("ndp: removePermanentIPv6EndpointLocked(%s, false): %s", r.addrWithPrefix(), err))
+ }
}
- state.deprecationTimer.StopLocked()
- state.invalidationTimer.StopLocked()
- delete(ndp.slaacPrefixes, prefix)
+ ndp.cleanupSLAACPrefixResources(prefix, state)
+}
- addr := state.ref.ep.ID().LocalAddress
+// cleanupSLAACAddrResourcesAndNotify cleans up an invalidated SLAAC address's
+// resources.
+//
+// The NIC that ndp belongs to MUST be locked.
+func (ndp *ndpState) cleanupSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPrefix, invalidatePrefix bool) {
+ if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil {
+ ndpDisp.OnAutoGenAddressInvalidated(ndp.nic.ID(), addr)
+ }
- if removeAddr {
- if err := ndp.nic.removePermanentAddressLocked(addr); err != nil {
- panic(fmt.Sprintf("ndp: removePermanentAddressLocked(%s): %s", addr, err))
- }
+ prefix := addr.Subnet()
+ state, ok := ndp.slaacPrefixes[prefix]
+ if !ok || state.ref == nil || addr.Address != state.ref.ep.ID().LocalAddress {
+ return
}
- if ndpDisp := ndp.nic.stack.ndpDisp; ndpDisp != nil {
- ndpDisp.OnAutoGenAddressInvalidated(ndp.nic.ID(), tcpip.AddressWithPrefix{
- Address: addr,
- PrefixLen: state.ref.ep.PrefixLen(),
- })
+ if !invalidatePrefix {
+ // If the prefix is not being invalidated, disassociate the address from the
+ // prefix and do nothing further.
+ state.ref = nil
+ ndp.slaacPrefixes[prefix] = state
+ return
}
+
+ ndp.cleanupSLAACPrefixResources(prefix, state)
}
-// cleanupSLAACAddrResourcesAndNotify cleans up an invalidated SLAAC
-// address's resources from ndp.
+// cleanupSLAACPrefixResources cleansup a SLAAC prefix's timers and entry.
+//
+// Panics if the SLAAC prefix is not known.
//
// The NIC that ndp belongs to MUST be locked.
-func (ndp *ndpState) cleanupSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPrefix) {
- ndp.invalidateSLAACPrefix(addr.Subnet(), false)
+func (ndp *ndpState) cleanupSLAACPrefixResources(prefix tcpip.Subnet, state slaacPrefixState) {
+ state.deprecationTimer.StopLocked()
+ state.invalidationTimer.StopLocked()
+ delete(ndp.slaacPrefixes, prefix)
}
// cleanupState cleans up ndp's state.
@@ -1181,7 +1277,7 @@ func (ndp *ndpState) cleanupSLAACAddrResourcesAndNotify(addr tcpip.AddressWithPr
func (ndp *ndpState) cleanupState(hostOnly bool) {
linkLocalSubnet := header.IPv6LinkLocalPrefix.Subnet()
linkLocalPrefixes := 0
- for prefix := range ndp.slaacPrefixes {
+ for prefix, state := range ndp.slaacPrefixes {
// RFC 4862 section 5 states that routers are also expected to generate a
// link-local address so we do not invalidate them if we are cleaning up
// host-only state.
@@ -1190,7 +1286,7 @@ func (ndp *ndpState) cleanupState(hostOnly bool) {
continue
}
- ndp.invalidateSLAACPrefix(prefix, true)
+ ndp.invalidateSLAACPrefix(prefix, state)
}
if got := len(ndp.slaacPrefixes); got != linkLocalPrefixes {
diff --git a/pkg/tcpip/stack/ndp_test.go b/pkg/tcpip/stack/ndp_test.go
index acb2d4731..6562a2d22 100644
--- a/pkg/tcpip/stack/ndp_test.go
+++ b/pkg/tcpip/stack/ndp_test.go
@@ -623,6 +623,12 @@ func TestDADFail(t *testing.T) {
if want := (tcpip.AddressWithPrefix{}); addr != want {
t.Fatalf("got stack.GetMainNICAddress(%d, %d) = (%s, nil), want = (%s, nil)", nicID, header.IPv6ProtocolNumber, addr, want)
}
+
+ // Attempting to add the address again should not fail if the address's
+ // state was cleaned up when DAD failed.
+ if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr1); err != nil {
+ t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr1, err)
+ }
})
}
}
@@ -2783,6 +2789,461 @@ func TestAutoGenAddrWithOpaqueIID(t *testing.T) {
}
}
+// TestAutoGenAddrWithOpaqueIIDDADRetries tests the regeneration of an
+// auto-generated IPv6 address in response to a DAD conflict.
+func TestAutoGenAddrWithOpaqueIIDDADRetries(t *testing.T) {
+ const nicID = 1
+ const nicName = "nic"
+ const dadTransmits = 1
+ const retransmitTimer = time.Second
+ const maxMaxRetries = 3
+ const lifetimeSeconds = 10
+
+ var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes]byte
+ secretKey := secretKeyBuf[:]
+ n, err := rand.Read(secretKey)
+ if err != nil {
+ t.Fatalf("rand.Read(_): %s", err)
+ }
+ if n != header.OpaqueIIDSecretKeyMinBytes {
+ t.Fatalf("got rand.Read(_) = (%d, _), want = (%d, _)", n, header.OpaqueIIDSecretKeyMinBytes)
+ }
+
+ prefix, subnet, _ := prefixSubnetAddr(0, linkAddr1)
+
+ for maxRetries := uint8(0); maxRetries <= maxMaxRetries; maxRetries++ {
+ for numFailures := uint8(0); numFailures <= maxRetries+1; numFailures++ {
+ addrTypes := []struct {
+ name string
+ ndpConfigs stack.NDPConfigurations
+ autoGenLinkLocal bool
+ subnet tcpip.Subnet
+ triggerSLAACFn func(e *channel.Endpoint)
+ }{
+ {
+ name: "Global address",
+ ndpConfigs: stack.NDPConfigurations{
+ DupAddrDetectTransmits: dadTransmits,
+ RetransmitTimer: retransmitTimer,
+ HandleRAs: true,
+ AutoGenGlobalAddresses: true,
+ AutoGenAddressConflictRetries: maxRetries,
+ },
+ subnet: subnet,
+ triggerSLAACFn: func(e *channel.Endpoint) {
+ // Receive an RA with prefix1 in a PI.
+ e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds))
+
+ },
+ },
+ {
+ name: "LinkLocal address",
+ ndpConfigs: stack.NDPConfigurations{
+ DupAddrDetectTransmits: dadTransmits,
+ RetransmitTimer: retransmitTimer,
+ AutoGenAddressConflictRetries: maxRetries,
+ },
+ autoGenLinkLocal: true,
+ subnet: header.IPv6LinkLocalPrefix.Subnet(),
+ triggerSLAACFn: func(e *channel.Endpoint) {},
+ },
+ }
+
+ for _, addrType := range addrTypes {
+ maxRetries := maxRetries
+ numFailures := numFailures
+ addrType := addrType
+
+ t.Run(fmt.Sprintf("%s with %d max retries and %d failures", addrType.name, maxRetries, numFailures), func(t *testing.T) {
+ t.Parallel()
+
+ ndpDisp := ndpDispatcher{
+ dadC: make(chan ndpDADEvent, 1),
+ autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2),
+ }
+ e := channel.New(0, 1280, linkAddr1)
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()},
+ AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal,
+ NDPConfigs: addrType.ndpConfigs,
+ NDPDisp: &ndpDisp,
+ OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{
+ NICNameFromID: func(_ tcpip.NICID, nicName string) string {
+ return nicName
+ },
+ SecretKey: secretKey,
+ },
+ })
+ opts := stack.NICOptions{Name: nicName}
+ if err := s.CreateNICWithOptions(nicID, e, opts); err != nil {
+ t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, opts, err)
+ }
+
+ expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) {
+ t.Helper()
+
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" {
+ t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected addr auto gen event")
+ }
+ }
+
+ addrType.triggerSLAACFn(e)
+
+ // Simulate DAD conflicts so the address is regenerated.
+ for i := uint8(0); i < numFailures; i++ {
+ addrBytes := []byte(addrType.subnet.ID())
+ addr := tcpip.AddressWithPrefix{
+ Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], addrType.subnet, nicName, i, secretKey)),
+ PrefixLen: 64,
+ }
+ expectAutoGenAddrEvent(addr, newAddr)
+
+ // Should not have any addresses assigned to the NIC.
+ mainAddr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber)
+ if err != nil {
+ t.Fatalf("stack.GetMainNICAddress(%d, _) err = %s", nicID, err)
+ }
+ if want := (tcpip.AddressWithPrefix{}); mainAddr != want {
+ t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", mainAddr, want)
+ }
+
+ // Simulate a DAD conflict.
+ if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil {
+ t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err)
+ }
+ expectAutoGenAddrEvent(addr, invalidatedAddr)
+ select {
+ case e := <-ndpDisp.dadC:
+ if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" {
+ t.Errorf("dad event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected DAD event")
+ }
+
+ // Attempting to add the address manually should not fail if the
+ // address's state was cleaned up when DAD failed.
+ if err := s.AddAddress(nicID, header.IPv6ProtocolNumber, addr.Address); err != nil {
+ t.Fatalf("AddAddress(%d, %d, %s) = %s", nicID, header.IPv6ProtocolNumber, addr.Address, err)
+ }
+ if err := s.RemoveAddress(nicID, addr.Address); err != nil {
+ t.Fatalf("RemoveAddress(%d, %s) = %s", nicID, addr.Address, err)
+ }
+ select {
+ case e := <-ndpDisp.dadC:
+ if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" {
+ t.Errorf("dad event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected DAD event")
+ }
+ }
+
+ // Should not have any addresses assigned to the NIC.
+ mainAddr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber)
+ if err != nil {
+ t.Fatalf("stack.GetMainNICAddress(%d, _) err = %s", nicID, err)
+ }
+ if want := (tcpip.AddressWithPrefix{}); mainAddr != want {
+ t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", mainAddr, want)
+ }
+
+ // If we had less failures than generation attempts, we should have an
+ // address after DAD resolves.
+ if maxRetries+1 > numFailures {
+ addrBytes := []byte(addrType.subnet.ID())
+ addr := tcpip.AddressWithPrefix{
+ Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], addrType.subnet, nicName, numFailures, secretKey)),
+ PrefixLen: 64,
+ }
+ expectAutoGenAddrEvent(addr, newAddr)
+
+ select {
+ case e := <-ndpDisp.dadC:
+ if diff := checkDADEvent(e, nicID, addr.Address, true, nil); diff != "" {
+ t.Errorf("dad event mismatch (-want +got):\n%s", diff)
+ }
+ case <-time.After(dadTransmits*retransmitTimer + defaultAsyncEventTimeout):
+ t.Fatal("timed out waiting for DAD event")
+ }
+
+ mainAddr, err := s.GetMainNICAddress(nicID, header.IPv6ProtocolNumber)
+ if err != nil {
+ t.Fatalf("stack.GetMainNICAddress(%d, _) err = %s", nicID, err)
+ }
+ if mainAddr != addr {
+ t.Fatalf("got stack.GetMainNICAddress(_, _) = (%s, nil), want = (%s, nil)", mainAddr, addr)
+ }
+ }
+
+ // Should not attempt address regeneration again.
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ t.Fatalf("unexpectedly got an auto-generated address event = %+v", e)
+ case <-time.After(defaultAsyncEventTimeout):
+ }
+ })
+ }
+ }
+ }
+}
+
+// TestAutoGenAddrWithEUI64IIDNoDADRetries tests that a regeneration attempt is
+// not made for SLAAC addresses generated with an IID based on the NIC's link
+// address.
+func TestAutoGenAddrWithEUI64IIDNoDADRetries(t *testing.T) {
+ const nicID = 1
+ const dadTransmits = 1
+ const retransmitTimer = time.Second
+ const maxRetries = 3
+ const lifetimeSeconds = 10
+
+ prefix, subnet, _ := prefixSubnetAddr(0, linkAddr1)
+
+ addrTypes := []struct {
+ name string
+ ndpConfigs stack.NDPConfigurations
+ autoGenLinkLocal bool
+ subnet tcpip.Subnet
+ triggerSLAACFn func(e *channel.Endpoint)
+ }{
+ {
+ name: "Global address",
+ ndpConfigs: stack.NDPConfigurations{
+ DupAddrDetectTransmits: dadTransmits,
+ RetransmitTimer: retransmitTimer,
+ HandleRAs: true,
+ AutoGenGlobalAddresses: true,
+ AutoGenAddressConflictRetries: maxRetries,
+ },
+ subnet: subnet,
+ triggerSLAACFn: func(e *channel.Endpoint) {
+ // Receive an RA with prefix1 in a PI.
+ e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds))
+
+ },
+ },
+ {
+ name: "LinkLocal address",
+ ndpConfigs: stack.NDPConfigurations{
+ DupAddrDetectTransmits: dadTransmits,
+ RetransmitTimer: retransmitTimer,
+ AutoGenAddressConflictRetries: maxRetries,
+ },
+ autoGenLinkLocal: true,
+ subnet: header.IPv6LinkLocalPrefix.Subnet(),
+ triggerSLAACFn: func(e *channel.Endpoint) {},
+ },
+ }
+
+ for _, addrType := range addrTypes {
+ addrType := addrType
+
+ t.Run(addrType.name, func(t *testing.T) {
+ t.Parallel()
+
+ ndpDisp := ndpDispatcher{
+ dadC: make(chan ndpDADEvent, 1),
+ autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2),
+ }
+ e := channel.New(0, 1280, linkAddr1)
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()},
+ AutoGenIPv6LinkLocal: addrType.autoGenLinkLocal,
+ NDPConfigs: addrType.ndpConfigs,
+ NDPDisp: &ndpDisp,
+ })
+ if err := s.CreateNIC(nicID, e); err != nil {
+ t.Fatalf("CreateNIC(%d, _) = %s", nicID, err)
+ }
+
+ expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) {
+ t.Helper()
+
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" {
+ t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected addr auto gen event")
+ }
+ }
+
+ addrType.triggerSLAACFn(e)
+
+ addrBytes := []byte(addrType.subnet.ID())
+ header.EthernetAdddressToModifiedEUI64IntoBuf(linkAddr1, addrBytes[header.IIDOffsetInIPv6Address:])
+ addr := tcpip.AddressWithPrefix{
+ Address: tcpip.Address(addrBytes),
+ PrefixLen: 64,
+ }
+ expectAutoGenAddrEvent(addr, newAddr)
+
+ // Simulate a DAD conflict.
+ if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil {
+ t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err)
+ }
+ expectAutoGenAddrEvent(addr, invalidatedAddr)
+ select {
+ case e := <-ndpDisp.dadC:
+ if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" {
+ t.Errorf("dad event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected DAD event")
+ }
+
+ // Should not attempt address regeneration.
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ t.Fatalf("unexpectedly got an auto-generated address event = %+v", e)
+ case <-time.After(defaultAsyncEventTimeout):
+ }
+ })
+ }
+}
+
+// TestAutoGenAddrContinuesLifetimesAfterRetry tests that retrying address
+// generation in response to DAD conflicts does not refresh the lifetimes.
+func TestAutoGenAddrContinuesLifetimesAfterRetry(t *testing.T) {
+ const nicID = 1
+ const nicName = "nic"
+ const dadTransmits = 1
+ const retransmitTimer = 2 * time.Second
+ const failureTimer = time.Second
+ const maxRetries = 1
+ const lifetimeSeconds = 5
+
+ var secretKeyBuf [header.OpaqueIIDSecretKeyMinBytes]byte
+ secretKey := secretKeyBuf[:]
+ n, err := rand.Read(secretKey)
+ if err != nil {
+ t.Fatalf("rand.Read(_): %s", err)
+ }
+ if n != header.OpaqueIIDSecretKeyMinBytes {
+ t.Fatalf("got rand.Read(_) = (%d, _), want = (%d, _)", n, header.OpaqueIIDSecretKeyMinBytes)
+ }
+
+ prefix, subnet, _ := prefixSubnetAddr(0, linkAddr1)
+
+ ndpDisp := ndpDispatcher{
+ dadC: make(chan ndpDADEvent, 1),
+ autoGenAddrC: make(chan ndpAutoGenAddrEvent, 2),
+ }
+ e := channel.New(0, 1280, linkAddr1)
+ s := stack.New(stack.Options{
+ NetworkProtocols: []stack.NetworkProtocol{ipv6.NewProtocol()},
+ NDPConfigs: stack.NDPConfigurations{
+ DupAddrDetectTransmits: dadTransmits,
+ RetransmitTimer: retransmitTimer,
+ HandleRAs: true,
+ AutoGenGlobalAddresses: true,
+ AutoGenAddressConflictRetries: maxRetries,
+ },
+ NDPDisp: &ndpDisp,
+ OpaqueIIDOpts: stack.OpaqueInterfaceIdentifierOptions{
+ NICNameFromID: func(_ tcpip.NICID, nicName string) string {
+ return nicName
+ },
+ SecretKey: secretKey,
+ },
+ })
+ opts := stack.NICOptions{Name: nicName}
+ if err := s.CreateNICWithOptions(nicID, e, opts); err != nil {
+ t.Fatalf("CreateNICWithOptions(%d, _, %+v) = %s", nicID, opts, err)
+ }
+
+ expectAutoGenAddrEvent := func(addr tcpip.AddressWithPrefix, eventType ndpAutoGenAddrEventType) {
+ t.Helper()
+
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ if diff := checkAutoGenAddrEvent(e, addr, eventType); diff != "" {
+ t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected addr auto gen event")
+ }
+ }
+
+ // Receive an RA with prefix in a PI.
+ e.InjectInbound(header.IPv6ProtocolNumber, raBufWithPI(llAddr2, 0, prefix, true, true, lifetimeSeconds, lifetimeSeconds))
+
+ addrBytes := []byte(subnet.ID())
+ addr := tcpip.AddressWithPrefix{
+ Address: tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet, nicName, 0, secretKey)),
+ PrefixLen: 64,
+ }
+ expectAutoGenAddrEvent(addr, newAddr)
+
+ // Simulate a DAD conflict after some time has passed.
+ time.Sleep(failureTimer)
+ if err := s.DupTentativeAddrDetected(nicID, addr.Address); err != nil {
+ t.Fatalf("s.DupTentativeAddrDetected(%d, %s): %s", nicID, addr.Address, err)
+ }
+ expectAutoGenAddrEvent(addr, invalidatedAddr)
+ select {
+ case e := <-ndpDisp.dadC:
+ if diff := checkDADEvent(e, nicID, addr.Address, false, nil); diff != "" {
+ t.Errorf("dad event mismatch (-want +got):\n%s", diff)
+ }
+ default:
+ t.Fatal("expected DAD event")
+ }
+
+ // Let the next address resolve.
+ addr.Address = tcpip.Address(header.AppendOpaqueInterfaceIdentifier(addrBytes[:header.IIDOffsetInIPv6Address], subnet, nicName, 1, secretKey))
+ expectAutoGenAddrEvent(addr, newAddr)
+ select {
+ case e := <-ndpDisp.dadC:
+ if diff := checkDADEvent(e, nicID, addr.Address, true, nil); diff != "" {
+ t.Errorf("dad event mismatch (-want +got):\n%s", diff)
+ }
+ case <-time.After(dadTransmits*retransmitTimer + defaultAsyncEventTimeout):
+ t.Fatal("timed out waiting for DAD event")
+ }
+
+ // Address should be deprecated/invalidated after the lifetime expires.
+ //
+ // Note, the remaining lifetime is calculated from when the PI was first
+ // processed. Since we wait for some time before simulating a DAD conflict
+ // and more time for the new address to resolve, the new address is only
+ // expected to be valid for the remaining time. The DAD conflict should
+ // not have reset the lifetimes.
+ //
+ // We expect either just the invalidation event or the deprecation event
+ // followed by the invalidation event.
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ if e.eventType == deprecatedAddr {
+ if diff := checkAutoGenAddrEvent(e, addr, deprecatedAddr); diff != "" {
+ t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff)
+ }
+
+ select {
+ case e := <-ndpDisp.autoGenAddrC:
+ if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" {
+ t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff)
+ }
+ case <-time.After(defaultAsyncEventTimeout):
+ t.Fatal("timed out waiting for invalidated auto gen addr event after deprecation")
+ }
+ } else {
+ if diff := checkAutoGenAddrEvent(e, addr, invalidatedAddr); diff != "" {
+ t.Errorf("auto-gen addr event mismatch (-want +got):\n%s", diff)
+ }
+ }
+ case <-time.After(lifetimeSeconds*time.Second - failureTimer - dadTransmits*retransmitTimer + defaultAsyncEventTimeout):
+ t.Fatal("timed out waiting for auto gen addr event")
+ }
+}
+
// TestNDPRecursiveDNSServerDispatch tests that we properly dispatch an event
// to the integrator when an RA is received with the NDP Recursive DNS Server
// option with at least one valid address.
diff --git a/pkg/tcpip/stack/nic.go b/pkg/tcpip/stack/nic.go
index 4835251bc..016dbe15e 100644
--- a/pkg/tcpip/stack/nic.go
+++ b/pkg/tcpip/stack/nic.go
@@ -1012,29 +1012,31 @@ func (n *NIC) removePermanentAddressLocked(addr tcpip.Address) *tcpip.Error {
return tcpip.ErrBadLocalAddress
}
- isIPv6Unicast := r.protocol == header.IPv6ProtocolNumber && header.IsV6UnicastAddress(addr)
+ switch r.protocol {
+ case header.IPv6ProtocolNumber:
+ return n.removePermanentIPv6EndpointLocked(r, true /* allowSLAAPrefixInvalidation */)
+ default:
+ r.expireLocked()
+ return nil
+ }
+}
+
+func (n *NIC) removePermanentIPv6EndpointLocked(r *referencedNetworkEndpoint, allowSLAACPrefixInvalidation bool) *tcpip.Error {
+ addr := r.addrWithPrefix()
+
+ isIPv6Unicast := header.IsV6UnicastAddress(addr.Address)
if isIPv6Unicast {
- // If we are removing a tentative IPv6 unicast address, stop DAD.
- if kind == permanentTentative {
- n.mu.ndp.stopDuplicateAddressDetection(addr)
- }
+ n.mu.ndp.stopDuplicateAddressDetection(addr.Address)
// If we are removing an address generated via SLAAC, cleanup
// its SLAAC resources and notify the integrator.
if r.configType == slaac {
- n.mu.ndp.cleanupSLAACAddrResourcesAndNotify(tcpip.AddressWithPrefix{
- Address: addr,
- PrefixLen: r.ep.PrefixLen(),
- })
+ n.mu.ndp.cleanupSLAACAddrResourcesAndNotify(addr, allowSLAACPrefixInvalidation)
}
}
- r.setKind(permanentExpired)
- if !r.decRefLocked() {
- // The endpoint still has references to it.
- return nil
- }
+ r.expireLocked()
// At this point the endpoint is deleted.
@@ -1044,7 +1046,7 @@ func (n *NIC) removePermanentAddressLocked(addr tcpip.Address) *tcpip.Error {
// We ignore the tcpip.ErrBadLocalAddress error because the solicited-node
// multicast group may be left by user action.
if isIPv6Unicast {
- snmc := header.SolicitedNodeAddr(addr)
+ snmc := header.SolicitedNodeAddr(addr.Address)
if err := n.leaveGroupLocked(snmc, false /* force */); err != nil && err != tcpip.ErrBadLocalAddress {
return err
}
@@ -1425,10 +1427,12 @@ func (n *NIC) isAddrTentative(addr tcpip.Address) bool {
return ref.getKind() == permanentTentative
}
-// dupTentativeAddrDetected attempts to inform n that a tentative addr
-// is a duplicate on a link.
+// dupTentativeAddrDetected attempts to inform n that a tentative addr is a
+// duplicate on a link.
//
-// dupTentativeAddrDetected will delete the tentative address if it exists.
+// dupTentativeAddrDetected will remove the tentative address if it exists. If
+// the address was generated via SLAAC, an attempt will be made to generate a
+// new address.
func (n *NIC) dupTentativeAddrDetected(addr tcpip.Address) *tcpip.Error {
n.mu.Lock()
defer n.mu.Unlock()
@@ -1442,7 +1446,17 @@ func (n *NIC) dupTentativeAddrDetected(addr tcpip.Address) *tcpip.Error {
return tcpip.ErrInvalidEndpointState
}
- return n.removePermanentAddressLocked(addr)
+ // If the address is a SLAAC address, do not invalidate its SLAAC prefix as a
+ // new address will be generated for it.
+ if err := n.removePermanentIPv6EndpointLocked(ref, false /* allowSLAACPrefixInvalidation */); err != nil {
+ return err
+ }
+
+ if ref.configType == slaac {
+ n.mu.ndp.regenerateSLAACAddr(ref.addrWithPrefix().Subnet())
+ }
+
+ return nil
}
// setNDPConfigs sets the NDP configurations for n.
@@ -1570,6 +1584,13 @@ type referencedNetworkEndpoint struct {
deprecated bool
}
+func (r *referencedNetworkEndpoint) addrWithPrefix() tcpip.AddressWithPrefix {
+ return tcpip.AddressWithPrefix{
+ Address: r.ep.ID().LocalAddress,
+ PrefixLen: r.ep.PrefixLen(),
+ }
+}
+
func (r *referencedNetworkEndpoint) getKind() networkEndpointKind {
return networkEndpointKind(atomic.LoadInt32((*int32)(&r.kind)))
}
@@ -1597,6 +1618,13 @@ func (r *referencedNetworkEndpoint) isValidForOutgoingRLocked() bool {
return r.nic.mu.enabled && (r.getKind() != permanentExpired || r.nic.mu.spoofing)
}
+// expireLocked decrements the reference count and marks the permanent endpoint
+// as expired.
+func (r *referencedNetworkEndpoint) expireLocked() {
+ r.setKind(permanentExpired)
+ r.decRefLocked()
+}
+
// decRef decrements the ref count and cleans up the endpoint once it reaches
// zero.
func (r *referencedNetworkEndpoint) decRef() {
@@ -1606,14 +1634,11 @@ func (r *referencedNetworkEndpoint) decRef() {
}
// decRefLocked is the same as decRef but assumes that the NIC.mu mutex is
-// locked. Returns true if the endpoint was removed.
-func (r *referencedNetworkEndpoint) decRefLocked() bool {
+// locked.
+func (r *referencedNetworkEndpoint) decRefLocked() {
if atomic.AddInt32(&r.refs, -1) == 0 {
r.nic.removeEndpointLocked(r)
- return true
}
-
- return false
}
// incRef increments the ref count. It must only be called when the caller is
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 04:34:49 +0000