multi: use wire records on payment and intercept flows

htlcswitch/interceptable_switch.go

@@ -12,6 +12,7 @@ import (
 	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/htlcswitch/hop"
 	"github.com/lightningnetwork/lnd/lntypes"
+	"github.com/lightningnetwork/lnd/lnutils"
 	"github.com/lightningnetwork/lnd/lnwire"
 )
 
@@ -645,15 +646,16 @@ func (f *interceptedForward) Packet() InterceptedPacket {
 			ChanID: f.packet.incomingChanID,
 			HtlcID: f.packet.incomingHTLCID,
 		},
-		OutgoingChanID: f.packet.outgoingChanID,
-		Hash:           f.htlc.PaymentHash,
-		OutgoingExpiry: f.htlc.Expiry,
-		OutgoingAmount: f.htlc.Amount,
-		IncomingAmount: f.packet.incomingAmount,
-		IncomingExpiry: f.packet.incomingTimeout,
-		CustomRecords:  f.packet.customRecords,
-		OnionBlob:      f.htlc.OnionBlob,
-		AutoFailHeight: f.autoFailHeight,
+		OutgoingChanID:       f.packet.outgoingChanID,
+		Hash:                 f.htlc.PaymentHash,
+		OutgoingExpiry:       f.htlc.Expiry,
+		OutgoingAmount:       f.htlc.Amount,
+		IncomingAmount:       f.packet.incomingAmount,
+		IncomingExpiry:       f.packet.incomingTimeout,
+		InOnionCustomRecords: f.packet.inOnionCustomRecords,
+		OnionBlob:            f.htlc.OnionBlob,
+		AutoFailHeight:       f.autoFailHeight,
+		InWireCustomRecords:  f.packet.inWireCustomRecords,
 	}
 }
 
@@ -723,6 +725,8 @@ func (f *interceptedForward) ResumeModified(
 		}
 	}
 
+	log.Tracef("Forwarding packet %v", lnutils.SpewLogClosure(f.packet))
+
 	// Forward to the switch. A link quit channel isn't needed, because we
 	// are on a different thread now.
 	return f.htlcSwitch.ForwardPackets(nil, f.packet)

htlcswitch/interfaces.go

@@ -357,13 +357,17 @@ type InterceptedPacket struct {
 	// IncomingAmount is the amount of the accepted htlc.
 	IncomingAmount lnwire.MilliSatoshi
 
-	// CustomRecords are user-defined records in the custom type range that
-	// were included in the payload.
-	CustomRecords record.CustomSet
+	// InOnionCustomRecords are user-defined records in the custom type
+	// range that were included in the payload.
+	InOnionCustomRecords record.CustomSet
 
 	// OnionBlob is the onion packet for the next hop
 	OnionBlob [lnwire.OnionPacketSize]byte
 
+	// InWireCustomRecords are user-defined p2p wire message records that
+	// were defined by the peer that forwarded this HTLC to us.
+	InWireCustomRecords lnwire.CustomRecords
+
 	// AutoFailHeight is the block height at which this intercept will be
 	// failed back automatically.
 	AutoFailHeight int32

htlcswitch/link.go

@@ -3630,7 +3630,7 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg,
 				}
 
 				// Otherwise, it was already processed, we can
-				// can collect it and continue.
+				// collect it and continue.
 				addMsg := &lnwire.UpdateAddHTLC{
 					Expiry:        fwdInfo.OutgoingCTLV,
 					Amount:        fwdInfo.AmountToForward,
@@ -3650,19 +3650,21 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg,
 
 				inboundFee := l.cfg.FwrdingPolicy.InboundFee
 
+				//nolint:lll
 				updatePacket := &htlcPacket{
-					incomingChanID:  l.ShortChanID(),
-					incomingHTLCID:  pd.HtlcIndex,
-					outgoingChanID:  fwdInfo.NextHop,
-					sourceRef:       pd.SourceRef,
-					incomingAmount:  pd.Amount,
-					amount:          addMsg.Amount,
-					htlc:            addMsg,
-					obfuscator:      obfuscator,
-					incomingTimeout: pd.Timeout,
-					outgoingTimeout: fwdInfo.OutgoingCTLV,
-					customRecords:   pld.CustomRecords(),
-					inboundFee:      inboundFee,
+					incomingChanID:       l.ShortChanID(),
+					incomingHTLCID:       pd.HtlcIndex,
+					outgoingChanID:       fwdInfo.NextHop,
+					sourceRef:            pd.SourceRef,
+					incomingAmount:       pd.Amount,
+					amount:               addMsg.Amount,
+					htlc:                 addMsg,
+					obfuscator:           obfuscator,
+					incomingTimeout:      pd.Timeout,
+					outgoingTimeout:      fwdInfo.OutgoingCTLV,
+					inOnionCustomRecords: pld.CustomRecords(),
+					inboundFee:           inboundFee,
+					inWireCustomRecords:  pd.CustomRecords.Copy(),
 				}
 				switchPackets = append(
 					switchPackets, updatePacket,
@@ -3718,19 +3720,21 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg,
 			if fwdPkg.State == channeldb.FwdStateLockedIn {
 				inboundFee := l.cfg.FwrdingPolicy.InboundFee
 
+				//nolint:lll
 				updatePacket := &htlcPacket{
-					incomingChanID:  l.ShortChanID(),
-					incomingHTLCID:  pd.HtlcIndex,
-					outgoingChanID:  fwdInfo.NextHop,
-					sourceRef:       pd.SourceRef,
-					incomingAmount:  pd.Amount,
-					amount:          addMsg.Amount,
-					htlc:            addMsg,
-					obfuscator:      obfuscator,
-					incomingTimeout: pd.Timeout,
-					outgoingTimeout: fwdInfo.OutgoingCTLV,
-					customRecords:   pld.CustomRecords(),
-					inboundFee:      inboundFee,
+					incomingChanID:       l.ShortChanID(),
+					incomingHTLCID:       pd.HtlcIndex,
+					outgoingChanID:       fwdInfo.NextHop,
+					sourceRef:            pd.SourceRef,
+					incomingAmount:       pd.Amount,
+					amount:               addMsg.Amount,
+					htlc:                 addMsg,
+					obfuscator:           obfuscator,
+					incomingTimeout:      pd.Timeout,
+					outgoingTimeout:      fwdInfo.OutgoingCTLV,
+					inOnionCustomRecords: pld.CustomRecords(),
+					inboundFee:           inboundFee,
+					inWireCustomRecords:  pd.CustomRecords.Copy(),
 				}
 
 				fwdPkg.FwdFilter.Set(idx)

htlcswitch/packet.go

@@ -94,9 +94,13 @@ type htlcPacket struct {
 	// link.
 	outgoingTimeout uint32
 
-	// customRecords are user-defined records in the custom type range that
-	// were included in the payload.
-	customRecords record.CustomSet
+	// inOnionCustomRecords are user-defined records in the custom type
+	// range that were included in the onion payload.
+	inOnionCustomRecords record.CustomSet
+
+	// inWireCustomRecords are custom type range TLVs that are included
+	// in the incoming update_add_htlc wire message.
+	inWireCustomRecords lnwire.CustomRecords
 
 	// originalOutgoingChanID is used when sending back failure messages.
 	// It is only used for forwarded Adds on option_scid_alias channels.

lnrpc/routerrpc/forward_interceptor.go

@@ -89,7 +89,7 @@ func (r *forwardInterceptor) onIntercept(
 		OutgoingExpiry:          htlc.OutgoingExpiry,
 		IncomingAmountMsat:      uint64(htlc.IncomingAmount),
 		IncomingExpiry:          htlc.IncomingExpiry,
-		CustomRecords:           htlc.CustomRecords,
+		CustomRecords:           htlc.InOnionCustomRecords,
 		OnionBlob:               htlc.OnionBlob[:],
 		AutoFailHeight:          htlc.AutoFailHeight,
 	}

lnwallet/channel.go

@@ -207,6 +207,7 @@ func PayDescsFromRemoteLogUpdates(chanID lnwire.ShortChannelID, height uint64,
 					Index:  uint16(i),
 				},
 				BlindingPoint: wireMsg.BlindingPoint,
+				CustomRecords: wireMsg.CustomRecords.Copy(),
 			}
 			pd.OnionBlob = make([]byte, len(wireMsg.OnionBlob))
 			copy(pd.OnionBlob[:], wireMsg.OnionBlob[:])
@@ -1154,6 +1155,7 @@ func (lc *LightningChannel) logUpdateToPayDesc(logUpdate *channeldb.LogUpdate,
 			LogIndex:              logUpdate.LogIndex,
 			addCommitHeightRemote: commitHeight,
 			BlindingPoint:         wireMsg.BlindingPoint,
+			CustomRecords:         wireMsg.CustomRecords.Copy(),
 		}
 		pd.OnionBlob = make([]byte, len(wireMsg.OnionBlob))
 		copy(pd.OnionBlob[:], wireMsg.OnionBlob[:])
@@ -1359,6 +1361,7 @@ func (lc *LightningChannel) remoteLogUpdateToPayDesc(logUpdate *channeldb.LogUpd
 			LogIndex:             logUpdate.LogIndex,
 			addCommitHeightLocal: commitHeight,
 			BlindingPoint:        wireMsg.BlindingPoint,
+			CustomRecords:        wireMsg.CustomRecords.Copy(),
 		}
 		pd.OnionBlob = make([]byte, len(wireMsg.OnionBlob))
 		copy(pd.OnionBlob, wireMsg.OnionBlob[:])
@@ -3403,6 +3406,7 @@ func (lc *LightningChannel) createCommitDiff(newCommit *commitment,
 				Expiry:        pd.Timeout,
 				PaymentHash:   pd.RHash,
 				BlindingPoint: pd.BlindingPoint,
+				CustomRecords: pd.CustomRecords.Copy(),
 			}
 			copy(htlc.OnionBlob[:], pd.OnionBlob)
 			logUpdate.UpdateMsg = htlc
@@ -3543,6 +3547,7 @@ func (lc *LightningChannel) getUnsignedAckedUpdates() []channeldb.LogUpdate {
 				Expiry:        pd.Timeout,
 				PaymentHash:   pd.RHash,
 				BlindingPoint: pd.BlindingPoint,
+				CustomRecords: pd.CustomRecords.Copy(),
 			}
 			copy(htlc.OnionBlob[:], pd.OnionBlob)
 			logUpdate.UpdateMsg = htlc
@@ -5620,6 +5625,7 @@ func (lc *LightningChannel) ReceiveRevocation(revMsg *lnwire.RevokeAndAck) (
 				Expiry:        pd.Timeout,
 				PaymentHash:   pd.RHash,
 				BlindingPoint: pd.BlindingPoint,
+				CustomRecords: pd.CustomRecords.Copy(),
 			}
 			copy(htlc.OnionBlob[:], pd.OnionBlob)
 			logUpdate.UpdateMsg = htlc
@@ -5965,9 +5971,7 @@ func (lc *LightningChannel) htlcAddDescriptor(htlc *lnwire.UpdateAddHTLC,
 		OnionBlob:      htlc.OnionBlob[:],
 		OpenCircuitKey: openKey,
 		BlindingPoint:  htlc.BlindingPoint,
-		// TODO(guggero): Add custom records from HTLC here once we have
-		// the custom records in the HTLC struct (later commits in this
-		// PR).
+		CustomRecords:  htlc.CustomRecords.Copy(),
 	}
 }
 
@@ -6028,9 +6032,7 @@ func (lc *LightningChannel) ReceiveHTLC(htlc *lnwire.UpdateAddHTLC) (uint64,
 		HtlcIndex:     lc.updateLogs.Remote.htlcCounter,
 		OnionBlob:     htlc.OnionBlob[:],
 		BlindingPoint: htlc.BlindingPoint,
-		// TODO(guggero): Add custom records from HTLC here once we have
-		// the custom records in the HTLC struct (later commits in this
-		// PR).
+		CustomRecords: htlc.CustomRecords.Copy(),
 	}
 
 	localACKedIndex := lc.commitChains.Remote.tail().messageIndices.Local

routing/payment_lifecycle.go

@@ -25,12 +25,13 @@ var ErrPaymentLifecycleExiting = errors.New("payment lifecycle exiting")
 // paymentLifecycle holds all information about the current state of a payment
 // needed to resume if from any point.
 type paymentLifecycle struct {
-	router        *ChannelRouter
-	feeLimit      lnwire.MilliSatoshi
-	identifier    lntypes.Hash
-	paySession    PaymentSession
-	shardTracker  shards.ShardTracker
-	currentHeight int32
+	router                *ChannelRouter
+	feeLimit              lnwire.MilliSatoshi
+	identifier            lntypes.Hash
+	paySession            PaymentSession
+	shardTracker          shards.ShardTracker
+	currentHeight         int32
+	firstHopCustomRecords lnwire.CustomRecords
 
 	// quit is closed to signal the sub goroutines of the payment lifecycle
 	// to stop.
@@ -52,18 +53,19 @@ type paymentLifecycle struct {
 // newPaymentLifecycle initiates a new payment lifecycle and returns it.
 func newPaymentLifecycle(r *ChannelRouter, feeLimit lnwire.MilliSatoshi,
 	identifier lntypes.Hash, paySession PaymentSession,
-	shardTracker shards.ShardTracker,
-	currentHeight int32) *paymentLifecycle {
+	shardTracker shards.ShardTracker, currentHeight int32,
+	firstHopCustomRecords lnwire.CustomRecords) *paymentLifecycle {
 
 	p := &paymentLifecycle{
-		router:          r,
-		feeLimit:        feeLimit,
-		identifier:      identifier,
-		paySession:      paySession,
-		shardTracker:    shardTracker,
-		currentHeight:   currentHeight,
-		quit:            make(chan struct{}),
-		resultCollected: make(chan error, 1),
+		router:                r,
+		feeLimit:              feeLimit,
+		identifier:            identifier,
+		paySession:            paySession,
+		shardTracker:          shardTracker,
+		currentHeight:         currentHeight,
+		quit:                  make(chan struct{}),
+		resultCollected:       make(chan error, 1),
+		firstHopCustomRecords: firstHopCustomRecords,
 	}
 
 	// Mount the result collector.
@@ -677,9 +679,10 @@ func (p *paymentLifecycle) sendAttempt(
 	// this packet will be used to route the payment through the network,
 	// starting with the first-hop.
 	htlcAdd := &lnwire.UpdateAddHTLC{
-		Amount:      rt.TotalAmount,
-		Expiry:      rt.TotalTimeLock,
-		PaymentHash: *attempt.Hash,
+		Amount:        rt.TotalAmount,
+		Expiry:        rt.TotalTimeLock,
+		PaymentHash:   *attempt.Hash,
+		CustomRecords: p.firstHopCustomRecords,
 	}
 
 	// Generate the raw encoded sphinx packet to be included along

routing/payment_lifecycle_test.go

@@ -89,7 +89,7 @@ func newTestPaymentLifecycle(t *testing.T) (*paymentLifecycle, *mockers) {
 	// Create a test payment lifecycle with no fee limit and no timeout.
 	p := newPaymentLifecycle(
 		rt, noFeeLimit, paymentHash, mockPaymentSession,
-		mockShardTracker, 0,
+		mockShardTracker, 0, nil,
 	)
 
 	// Create a mock payment which is returned from mockControlTower.

routing/router.go

@@ -865,6 +865,11 @@ type LightningPayment struct {
 	// fail.
 	DestCustomRecords record.CustomSet
 
+	// FirstHopCustomRecords are the TLV records that are to be sent to the
+	// first hop of this payment. These records will be transmitted via the
+	// wire message and therefore do not affect the onion payload size.
+	FirstHopCustomRecords lnwire.CustomRecords
+
 	// MaxParts is the maximum number of partial payments that may be used
 	// to complete the full amount.
 	MaxParts uint32
@@ -948,6 +953,7 @@ func (r *ChannelRouter) SendPayment(payment *LightningPayment) ([32]byte,
 	return r.sendPayment(
 		context.Background(), payment.FeeLimit, payment.Identifier(),
 		payment.PayAttemptTimeout, paySession, shardTracker,
+		payment.FirstHopCustomRecords,
 	)
 }
 
@@ -968,6 +974,7 @@ func (r *ChannelRouter) SendPaymentAsync(ctx context.Context,
 		_, _, err := r.sendPayment(
 			ctx, payment.FeeLimit, payment.Identifier(),
 			payment.PayAttemptTimeout, ps, st,
+			payment.FirstHopCustomRecords,
 		)
 		if err != nil {
 			log.Errorf("Payment %x failed: %v",
@@ -1141,7 +1148,9 @@ func (r *ChannelRouter) sendToRoute(htlcHash lntypes.Hash, rt *route.Route,
 	// - nil payment session (since we already have a route).
 	// - no payment timeout.
 	// - no current block height.
-	p := newPaymentLifecycle(r, 0, paymentIdentifier, nil, shardTracker, 0)
+	p := newPaymentLifecycle(
+		r, 0, paymentIdentifier, nil, shardTracker, 0, nil,
+	)
 
 	// We found a route to try, create a new HTLC attempt to try.
 	//
@@ -1237,7 +1246,9 @@ func (r *ChannelRouter) sendToRoute(htlcHash lntypes.Hash, rt *route.Route,
 func (r *ChannelRouter) sendPayment(ctx context.Context,
 	feeLimit lnwire.MilliSatoshi, identifier lntypes.Hash,
 	paymentAttemptTimeout time.Duration, paySession PaymentSession,
-	shardTracker shards.ShardTracker) ([32]byte, *route.Route, error) {
+	shardTracker shards.ShardTracker,
+	firstHopCustomRecords lnwire.CustomRecords) ([32]byte, *route.Route,
+	error) {
 
 	// If the user provides a timeout, we will additionally wrap the context
 	// in a deadline.
@@ -1262,7 +1273,7 @@ func (r *ChannelRouter) sendPayment(ctx context.Context,
 	// can resume the payment from the current state.
 	p := newPaymentLifecycle(
 		r, feeLimit, identifier, paySession, shardTracker,
-		currentHeight,
+		currentHeight, firstHopCustomRecords,
 	)
 
 	return p.resumePayment(ctx)
@@ -1465,7 +1476,7 @@ func (r *ChannelRouter) resumePayments() error {
 		noTimeout := time.Duration(0)
 		_, _, err := r.sendPayment(
 			context.Background(), 0, payHash, noTimeout, paySession,
-			shardTracker,
+			shardTracker, nil,
 		)
 		if err != nil {
 			log.Errorf("Resuming payment %v failed: %v", payHash,

witness_beacon.go

@@ -101,10 +101,11 @@ func (p *preimageBeacon) SubscribeUpdates(
 			ChanID: chanID,
 			HtlcID: htlc.HtlcIndex,
 		},
-		OutgoingChanID: payload.FwdInfo.NextHop,
-		OutgoingExpiry: payload.FwdInfo.OutgoingCTLV,
-		OutgoingAmount: payload.FwdInfo.AmountToForward,
-		CustomRecords:  payload.CustomRecords(),
+		OutgoingChanID:       payload.FwdInfo.NextHop,
+		OutgoingExpiry:       payload.FwdInfo.OutgoingCTLV,
+		OutgoingAmount:       payload.FwdInfo.AmountToForward,
+		InOnionCustomRecords: payload.CustomRecords(),
+		InWireCustomRecords:  htlc.CustomRecords,
 	}
 	copy(packet.OnionBlob[:], nextHopOnionBlob)