fix!: improve message validation (#1460)

* validate ValidatorSetChangePacketData * update ValidateBasic for ValidatorSetChangePacketData * update ConsumerPacketData validation * fix TestConsumerPacketSendExpiredClient * update TestOnRecvSlashPacketErrors * fix TestQueueAndSendSlashPacket * remove TODO * nit: validate MsgAssignConsumerKey * add changelog entries * fix linter * fix gosec * rename ValidateBasic to Validate (IBC packets) * Update x/ccv/types/wire.go Co-authored-by: Simon Noetzlin <[email protected]> * revert SlashPacketData address validation --------- Co-authored-by: Simon Noetzlin <[email protected]>
cosmos · Dec 1, 2023 · 0d82030 · 0d82030
1 parent b6c8f31
commit 0d82030
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Showing 15 changed files with 372 additions and 221 deletions.
diff --git a/.changelog/unreleased/state-breaking/1460-msg-validation.md b/.changelog/unreleased/state-breaking/1460-msg-validation.md
@@ -0,0 +1,3 @@
+- Improve validation of IBC packet data and provider messages. Also,
+  enable the provider to validate consumer packets before handling them.
+  ([\#1460](https://github.com/cosmos/interchain-security/pull/1460))
diff --git a/tests/integration/expired_client.go b/tests/integration/expired_client.go
@@ -129,7 +129,7 @@ func (s *CCVTestSuite) TestConsumerPacketSendExpiredClient() {
 
 	// try to send slash packet for downtime infraction
 	addr := ed25519.GenPrivKey().PubKey().Address()
-	val := abci.Validator{Address: addr}
+	val := abci.Validator{Address: addr, Power: 1}
 	consumerKeeper.QueueSlashPacket(s.consumerCtx(), val, 2, stakingtypes.Infraction_INFRACTION_DOWNTIME)
 	// try to send slash packet for the same downtime infraction
 	consumerKeeper.QueueSlashPacket(s.consumerCtx(), val, 3, stakingtypes.Infraction_INFRACTION_DOWNTIME)

diff --git a/tests/integration/slashing.go b/tests/integration/slashing.go
@@ -9,6 +9,7 @@ import (
 
 	cryptocodec "github.com/cosmos/cosmos-sdk/crypto/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkaddress "github.com/cosmos/cosmos-sdk/types/address"
 	evidencetypes "github.com/cosmos/cosmos-sdk/x/evidence/types"
 	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
 	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
@@ -269,12 +270,14 @@ func (s *CCVTestSuite) TestSlashPacketAcknowledgement() {
 	// Map infraction height on provider so validation passes and provider returns valid ack result
 	providerKeeper.SetValsetUpdateBlockHeight(s.providerCtx(), spd.ValsetUpdateId, 47923)
 
-	exportedAck := providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, spd)
-	s.Require().NotNil(exportedAck)
+	ackResult, err := providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, spd)
+	s.Require().NotNil(ackResult)
+	s.Require().NoError(err)
+	exportedAck := channeltypes.NewResultAcknowledgement(ackResult)
 
 	// Unmarshal ack to struct that's compatible with consumer. IBC does this automatically
 	ack := channeltypes.Acknowledgement{}
-	err := channeltypes.SubModuleCdc.UnmarshalJSON(exportedAck.Acknowledgement(), &ack)
+	err = channeltypes.SubModuleCdc.UnmarshalJSON(exportedAck.Acknowledgement(), &ack)
 	s.Require().NoError(err)
 
 	err = consumerKeeper.OnAcknowledgementPacket(s.consumerCtx(), packet, ack)
@@ -325,12 +328,11 @@ func (suite *CCVTestSuite) TestHandleSlashPacketDowntime() {
 	suite.Require().Equal(suite.providerCtx().BlockTime().Add(jailDuration), signingInfo.JailedUntil)
 }
 
+// TODO: had conflicts
 // TestOnRecvSlashPacketErrors tests errors for the OnRecvSlashPacket method in an integration testing setting
 func (suite *CCVTestSuite) TestOnRecvSlashPacketErrors() {
 	providerKeeper := suite.providerApp.GetProviderKeeper()
-	providerSlashingKeeper := suite.providerApp.GetTestSlashingKeeper()
 	firstBundle := suite.getFirstBundle()
-	consumerChainID := firstBundle.Chain.ChainID
 
 	suite.SetupAllCCVChannels()
 
@@ -339,106 +341,80 @@ func (suite *CCVTestSuite) TestOnRecvSlashPacketErrors() {
 
 	// Expect panic if ccv channel is not established via dest channel of packet
 	suite.Panics(func() {
-		providerKeeper.OnRecvSlashPacket(ctx, channeltypes.Packet{}, ccv.SlashPacketData{})
+		_, _ = providerKeeper.OnRecvSlashPacket(ctx, channeltypes.Packet{}, ccv.SlashPacketData{})
 	})
 
 	// Add correct channelID to packet. Now we will not panic anymore.
 	packet := channeltypes.Packet{DestinationChannel: firstBundle.Path.EndpointB.ChannelID}
+	suite.NotPanics(func() {
+		_, _ = providerKeeper.OnRecvSlashPacket(ctx, packet, ccv.SlashPacketData{})
+	})
 
-	// Init chain height is set by established CCV channel
-	// Delete init chain height and confirm expected error
-	initChainHeight, found := providerKeeper.GetInitChainHeight(ctx, consumerChainID)
-	suite.Require().True(found)
-	providerKeeper.DeleteInitChainHeight(ctx, consumerChainID)
-
-	packetData := ccv.SlashPacketData{ValsetUpdateId: 0}
-	errAck := providerKeeper.OnRecvSlashPacket(ctx, packet, packetData)
-	suite.Require().False(errAck.Success())
-	errAckCast := errAck.(channeltypes.Acknowledgement)
-	// Error strings in err acks are now thrown out by IBC core to prevent app hash.
-	// Hence a generic error string is expected.
-	suite.Require().Equal("ABCI code: 1: error handling packet: see events for details", errAckCast.GetError())
-
-	// Restore init chain height
-	providerKeeper.SetInitChainHeight(ctx, consumerChainID, initChainHeight)
-
-	// now the method will fail at infraction height check.
-	packetData.Infraction = stakingtypes.Infraction_INFRACTION_UNSPECIFIED
-	errAck = providerKeeper.OnRecvSlashPacket(ctx, packet, packetData)
-	suite.Require().False(errAck.Success())
-	errAckCast = errAck.(channeltypes.Acknowledgement)
-	suite.Require().Equal("ABCI code: 1: error handling packet: see events for details", errAckCast.GetError())
-
-	// save current VSC ID
-	vscID := providerKeeper.GetValidatorSetUpdateId(ctx)
-
-	// remove block height value mapped to current VSC ID
-	providerKeeper.DeleteValsetUpdateBlockHeight(ctx, vscID)
-
-	// Instantiate packet data with current VSC ID
-	packetData = ccv.SlashPacketData{ValsetUpdateId: vscID}
-
-	// expect an error if mapped block height is not found
-	errAck = providerKeeper.OnRecvSlashPacket(ctx, packet, packetData)
-	suite.Require().False(errAck.Success())
-	errAckCast = errAck.(channeltypes.Acknowledgement)
-	suite.Require().Equal("ABCI code: 1: error handling packet: see events for details", errAckCast.GetError())
-
-	// construct slashing packet with non existing validator
-	slashingPkt := ccv.NewSlashPacketData(
+	// Check Validate for SlashPacket data
+	validAddress := ed25519.GenPrivKey().PubKey().Address()
+	slashPacketData := ccv.NewSlashPacketData(
 		abci.Validator{
-			Address: ed25519.GenPrivKey().PubKey().Address(),
-			Power:   int64(0),
+			Address: validAddress,
+			Power:   int64(1),
 		}, uint64(0), stakingtypes.Infraction_INFRACTION_DOWNTIME,
 	)
 
-	// Set initial block height for consumer chain
-	providerKeeper.SetInitChainHeight(ctx, consumerChainID, uint64(ctx.BlockHeight()))
-
-	// Expect no error ack if validator does not exist
-	// TODO: this behavior should be changed to return an error ack,
-	// see: https://github.com/cosmos/interchain-security/issues/546
-	ack := providerKeeper.OnRecvSlashPacket(ctx, packet, *slashingPkt)
-	suite.Require().True(ack.Success())
-
-	val := suite.providerChain.Vals.Validators[0]
-
-	// commit block to set VSC ID
-	suite.coordinator.CommitBlock(suite.providerChain)
-	// Update suite.ctx bc CommitBlock updates only providerChain's current header block height
-	ctx = suite.providerChain.GetContext()
-	suite.Require().NotZero(providerKeeper.GetValsetUpdateBlockHeight(ctx, vscID))
-
-	// create validator signing info
-	valInfo := slashingtypes.NewValidatorSigningInfo(sdk.ConsAddress(val.Address), ctx.BlockHeight(),
-		ctx.BlockHeight()-1, time.Time{}.UTC(), false, int64(0))
-	providerSlashingKeeper.SetValidatorSigningInfo(ctx, sdk.ConsAddress(val.Address), valInfo)
-
-	// update validator address and VSC ID
-	slashingPkt.Validator.Address = val.Address
-	slashingPkt.ValsetUpdateId = vscID
-
-	// expect error ack when infraction type in unspecified
-	tmAddr := suite.providerChain.Vals.Validators[1].Address
-	slashingPkt.Validator.Address = tmAddr
-	slashingPkt.Infraction = stakingtypes.Infraction_INFRACTION_UNSPECIFIED
-
-	valInfo.Address = sdk.ConsAddress(tmAddr).String()
-	providerSlashingKeeper.SetValidatorSigningInfo(ctx, sdk.ConsAddress(tmAddr), valInfo)
-
-	errAck = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashingPkt)
-	suite.Require().False(errAck.Success())
-
-	// Expect nothing was queued
-	suite.Require().Equal(0, len(providerKeeper.GetAllGlobalSlashEntries(ctx)))
-	suite.Require().Equal(uint64(0), (providerKeeper.GetThrottledPacketDataSize(ctx, consumerChainID)))
-
-	// expect to queue entries for the slash request
-	slashingPkt.Infraction = stakingtypes.Infraction_INFRACTION_DOWNTIME
-	ack = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashingPkt)
-	suite.Require().True(ack.Success())
-	suite.Require().Equal(1, len(providerKeeper.GetAllGlobalSlashEntries(ctx)))
-	suite.Require().Equal(uint64(1), (providerKeeper.GetThrottledPacketDataSize(ctx, consumerChainID)))
+	// Expect an error if validator address is too long
+	slashPacketData.Validator.Address = make([]byte, sdkaddress.MaxAddrLen+1)
+	_, err := providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().Error(err, "validating SlashPacket data should fail - invalid validator address")
+
+	// Expect an error if validator power is zero
+	slashPacketData.Validator.Address = validAddress
+	slashPacketData.Validator.Power = 0
+	_, err = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().Error(err, "validating SlashPacket data should fail - invalid validator power")
+
+	// Expect an error if the infraction type is unspecified
+	slashPacketData.Validator.Power = 1
+	slashPacketData.Infraction = stakingtypes.Infraction_INFRACTION_UNSPECIFIED
+	_, err = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().Error(err, "validating SlashPacket data should fail - invalid infraction type")
+
+	// Restore slashPacketData to be valid
+	slashPacketData.Infraction = stakingtypes.Infraction_INFRACTION_DOWNTIME
+
+	// Check ValidateSlashPacket
+	// Expect an error if a mapping of the infraction height cannot be found;
+	// just set the vscID of the slash packet to the latest mapped vscID +1
+	valsetUpdateBlockHeights := providerKeeper.GetAllValsetUpdateBlockHeights(ctx)
+	latestMappedValsetUpdateId := valsetUpdateBlockHeights[len(valsetUpdateBlockHeights)-1].ValsetUpdateId
+	slashPacketData.ValsetUpdateId = latestMappedValsetUpdateId + 1
+	_, err = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().Error(err, "ValidateSlashPacket should fail - no infraction height mapping")
+
+	// Restore slashPacketData to be valid
+	slashPacketData.ValsetUpdateId = latestMappedValsetUpdateId
+
+	// Expect no error if validator does not exist
+	_, err = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().NoError(err, "no error expected")
+
+	// Check expected behavior for handling SlashPackets for double signing infractions
+	slashPacketData.Infraction = stakingtypes.Infraction_INFRACTION_DOUBLE_SIGN
+	ackResult, err := providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().NoError(err, "no error expected")
+	suite.Require().Equal(ccv.V1Result, ackResult, "expected successful ack")
+
+	// Check expected behavior for handling SlashPackets for downtime infractions
+	slashPacketData.Infraction = stakingtypes.Infraction_INFRACTION_DOWNTIME
+
+	// Expect the packet to bounce if the slash meter is negative
+	providerKeeper.SetSlashMeter(ctx, sdk.NewInt(-1))
+	ackResult, err = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().NoError(err, "no error expected")
+	suite.Require().Equal(ccv.SlashPacketBouncedResult, ackResult, "expected successful ack")
+
+	// Expect the packet to be handled if the slash meter is positive
+	providerKeeper.SetSlashMeter(ctx, sdk.NewInt(0))
+	ackResult, err = providerKeeper.OnRecvSlashPacket(ctx, packet, *slashPacketData)
+	suite.Require().NoError(err, "no error expected")
+	suite.Require().Equal(ccv.SlashPacketHandledResult, ackResult, "expected successful ack")
 }
 
 // TestValidatorDowntime tests if a slash packet is sent
@@ -654,6 +630,7 @@ func (suite *CCVTestSuite) TestQueueAndSendSlashPacket() {
 			addr := ed25519.GenPrivKey().PubKey().Address()
 			val := abci.Validator{
 				Address: addr,
+				Power:   int64(1),
 			}
 			consumerKeeper.QueueSlashPacket(ctx, val, 0, infraction)
 			slashedVals = append(slashedVals, slashedVal{validator: val, infraction: infraction})

diff --git a/tests/integration/throttle.go b/tests/integration/throttle.go
@@ -356,7 +356,8 @@ func (s *CCVTestSuite) TestPacketSpam() {
 		consumerPacketData, err := provider.UnmarshalConsumerPacketData(data) // Same func used by provider's OnRecvPacket
 		s.Require().NoError(err)
 		packet := s.newPacketFromConsumer(data, uint64(sequence), firstBundle.Path, timeoutHeight, timeoutTimestamp)
-		providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, *consumerPacketData.GetSlashPacketData())
+		_, err = providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, *consumerPacketData.GetSlashPacketData())
+		s.Require().NoError(err)
 	}
 
 	// Execute block to handle packets in endblock
@@ -416,7 +417,8 @@ func (s *CCVTestSuite) TestDoubleSignDoesNotAffectThrottling() {
 		consumerPacketData, err := provider.UnmarshalConsumerPacketData(data) // Same func used by provider's OnRecvPacket
 		s.Require().NoError(err)
 		packet := s.newPacketFromConsumer(data, uint64(sequence), firstBundle.Path, timeoutHeight, timeoutTimestamp)
-		providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, *consumerPacketData.GetSlashPacketData())
+		_, err = providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, *consumerPacketData.GetSlashPacketData())
+		s.Require().NoError(err)
 	}
 
 	// Execute block to handle packets in endblock
@@ -806,7 +808,8 @@ func (s CCVTestSuite) TestSlashAllValidators() { //nolint:govet // this is a tes
 		consumerPacketData, err := provider.UnmarshalConsumerPacketData(data) // Same func used by provider's OnRecvPacket
 		s.Require().NoError(err)
 		packet := s.newPacketFromConsumer(data, ibcSeqNum, s.getFirstBundle().Path, timeoutHeight, timeoutTimestamp)
-		providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, *consumerPacketData.GetSlashPacketData())
+		_, err = providerKeeper.OnRecvSlashPacket(s.providerCtx(), packet, *consumerPacketData.GetSlashPacketData())
+		s.Require().NoError(err)
 	}
 
 	// We should have 24 pending slash packet entries queued.

diff --git a/tests/integration/valset_update.go b/tests/integration/valset_update.go
@@ -71,9 +71,8 @@ func (suite *CCVTestSuite) TestQueueAndSendVSCMaturedPackets() {
 
 	// send first packet
 	packet := suite.newPacketFromProvider(pd.GetBytes(), 1, suite.path, clienttypes.NewHeight(1, 0), 0)
-	ack := consumerKeeper.OnRecvVSCPacket(suite.consumerChain.GetContext(), packet, pd)
-	suite.Require().NotNil(ack, "OnRecvVSCPacket did not return ack")
-	suite.Require().True(ack.Success(), "OnRecvVSCPacket did not return a Success Acknowledgment")
+	err = consumerKeeper.OnRecvVSCPacket(suite.consumerChain.GetContext(), packet, pd)
+	suite.Require().Nil(err, "OnRecvVSCPacket did return non-nil error")
 
 	// increase time
 	incrementTime(suite, time.Hour)
@@ -83,9 +82,8 @@ func (suite *CCVTestSuite) TestQueueAndSendVSCMaturedPackets() {
 	pd.ValsetUpdateId = 2
 	packet.Data = pd.GetBytes()
 	packet.Sequence = 2
-	ack = consumerKeeper.OnRecvVSCPacket(suite.consumerChain.GetContext(), packet, pd)
-	suite.Require().NotNil(ack, "OnRecvVSCPacket did not return ack")
-	suite.Require().True(ack.Success(), "OnRecvVSCPacket did not return a Success Acknowledgment")
+	err = consumerKeeper.OnRecvVSCPacket(suite.consumerChain.GetContext(), packet, pd)
+	suite.Require().Nil(err, "OnRecvVSCPacket did return non-nil error")
 
 	// increase time
 	incrementTime(suite, 24*time.Hour)
@@ -95,9 +93,8 @@ func (suite *CCVTestSuite) TestQueueAndSendVSCMaturedPackets() {
 	pd.ValsetUpdateId = 3
 	packet.Data = pd.GetBytes()
 	packet.Sequence = 3
-	ack = consumerKeeper.OnRecvVSCPacket(suite.consumerChain.GetContext(), packet, pd)
-	suite.Require().NotNil(ack, "OnRecvVSCPacket did not return ack")
-	suite.Require().True(ack.Success(), "OnRecvVSCPacket did not return a Success Acknowledgment")
+	err = consumerKeeper.OnRecvVSCPacket(suite.consumerChain.GetContext(), packet, pd)
+	suite.Require().Nil(err, "OnRecvVSCPacket did return non-nil error")
 
 	packetMaturities := consumerKeeper.GetAllPacketMaturityTimes(suite.consumerChain.GetContext())
 

diff --git a/x/ccv/consumer/ibc_module.go b/x/ccv/consumer/ibc_module.go
@@ -2,6 +2,7 @@ package consumer
 
 import (
 	"fmt"
+	"strconv"
 	"strings"
 
 	transfertypes "github.com/cosmos/ibc-go/v7/modules/apps/transfer/types"
@@ -225,25 +226,48 @@ func (am AppModule) OnRecvPacket(
 	packet channeltypes.Packet,
 	_ sdk.AccAddress,
 ) ibcexported.Acknowledgement {
-	var (
-		ack  ibcexported.Acknowledgement
-		data types.ValidatorSetChangePacketData
-	)
+	logger := am.keeper.Logger(ctx)
+	ack := channeltypes.NewResultAcknowledgement([]byte{byte(1)})
+
+	var data types.ValidatorSetChangePacketData
+	var ackErr error
 	if err := types.ModuleCdc.UnmarshalJSON(packet.GetData(), &data); err != nil {
-		errAck := types.NewErrorAcknowledgementWithLog(ctx, fmt.Errorf("cannot unmarshal CCV packet data"))
-		ack = &errAck
-	} else {
-		ack = am.keeper.OnRecvVSCPacket(ctx, packet, data)
+		ackErr = errorsmod.Wrapf(sdkerrors.ErrInvalidType, "cannot unmarshal VSCPacket data")
+		logger.Error(fmt.Sprintf("%s sequence %d", ackErr.Error(), packet.Sequence))
+		ack = channeltypes.NewErrorAcknowledgement(ackErr)
+	}
+
+	// only attempt the application logic if the packet data
+	// was successfully decoded
+	if ack.Success() {
+		err := am.keeper.OnRecvVSCPacket(ctx, packet, data)
+		if err != nil {
+			ack = channeltypes.NewErrorAcknowledgement(err)
+			ackErr = err
+			logger.Error(fmt.Sprintf("%s sequence %d", ackErr.Error(), packet.Sequence))
+		} else {
+			logger.Info("successfully handled VSCPacket sequence: %d", packet.Sequence)
+		}
+	}
+
+	eventAttributes := []sdk.Attribute{
+		sdk.NewAttribute(sdk.AttributeKeyModule, types.ModuleName),
+		sdk.NewAttribute(types.AttributeValSetUpdateID, strconv.Itoa(int(data.ValsetUpdateId))),
+		sdk.NewAttribute(types.AttributeKeyAckSuccess, fmt.Sprintf("%t", ack.Success())),
+	}
+
+	if ackErr != nil {
+		eventAttributes = append(eventAttributes, sdk.NewAttribute(types.AttributeKeyAckError, ackErr.Error()))
 	}
 
 	ctx.EventManager().EmitEvent(
 		sdk.NewEvent(
 			types.EventTypePacket,
-			sdk.NewAttribute(sdk.AttributeKeyModule, consumertypes.ModuleName),
-			sdk.NewAttribute(types.AttributeKeyAckSuccess, fmt.Sprintf("%t", ack != nil)),
+			eventAttributes...,
 		),
 	)
 
+	// NOTE: acknowledgement will be written synchronously during IBC handler execution.
 	return ack
 }
 

diff --git a/x/ccv/consumer/keeper/relay.go b/x/ccv/consumer/keeper/relay.go
@@ -6,7 +6,6 @@ import (
 
 	clienttypes "github.com/cosmos/ibc-go/v7/modules/core/02-client/types"
 	channeltypes "github.com/cosmos/ibc-go/v7/modules/core/04-channel/types"
-	"github.com/cosmos/ibc-go/v7/modules/core/exported"
 
 	errorsmod "cosmossdk.io/errors"
 
@@ -25,7 +24,12 @@ import (
 //
 // Note: CCV uses an ordered IBC channel, meaning VSC packet changes will be accumulated (and later
 // processed by ApplyCCValidatorChanges) s.t. more recent val power changes overwrite older ones.
-func (k Keeper) OnRecvVSCPacket(ctx sdk.Context, packet channeltypes.Packet, newChanges ccv.ValidatorSetChangePacketData) exported.Acknowledgement {
+func (k Keeper) OnRecvVSCPacket(ctx sdk.Context, packet channeltypes.Packet, newChanges ccv.ValidatorSetChangePacketData) error {
+	// validate packet data upon receiving
+	if err := newChanges.Validate(); err != nil {
+		return errorsmod.Wrapf(err, "error validating VSCPacket data")
+	}
+
 	// get the provider channel
 	providerChannel, found := k.GetProviderChannel(ctx)
 	if found && providerChannel != packet.DestinationChannel {
@@ -87,8 +91,7 @@ func (k Keeper) OnRecvVSCPacket(ctx sdk.Context, packet channeltypes.Packet, new
 		"len updates", len(newChanges.ValidatorUpdates),
 		"len slash acks", len(newChanges.SlashAcks),
 	)
-	ack := channeltypes.NewResultAcknowledgement([]byte{byte(1)})
-	return ack
+	return nil
 }
 
 // QueueVSCMaturedPackets appends matured VSCs to an internal queue.