From 043f6963e8bc56d497f1640ac507b3ca005c15ea Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Mon, 8 Apr 2024 14:40:50 +0100
Subject: [PATCH 01/15] multi: improve comment grammar

---
 htlcswitch/interfaces.go               | 2 +-
 lnrpc/routerrpc/forward_interceptor.go | 4 ++--
 lnrpc/routerrpc/router_server.go       | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/htlcswitch/interfaces.go b/htlcswitch/interfaces.go
index 2c27d8ab03..bad2c353d1 100644
--- a/htlcswitch/interfaces.go
+++ b/htlcswitch/interfaces.go
@@ -323,7 +323,7 @@ type InterceptableHtlcForwarder interface {
 type ForwardInterceptor func(InterceptedPacket) error
 
 // InterceptedPacket contains the relevant information for the interceptor about
-// an htlc.
+// an HTLC.
 type InterceptedPacket struct {
 	// IncomingCircuit contains the incoming channel and htlc id of the
 	// packet.
diff --git a/lnrpc/routerrpc/forward_interceptor.go b/lnrpc/routerrpc/forward_interceptor.go
index 8af1a21f6c..55c77d6d9b 100644
--- a/lnrpc/routerrpc/forward_interceptor.go
+++ b/lnrpc/routerrpc/forward_interceptor.go
@@ -22,7 +22,7 @@ var (
 	ErrMissingPreimage = errors.New("missing preimage")
 )
 
-// forwardInterceptor is a helper struct that handles the lifecycle of an rpc
+// forwardInterceptor is a helper struct that handles the lifecycle of an RPC
 // interceptor streaming session.
 // It is created when the stream opens and disconnects when the stream closes.
 type forwardInterceptor struct {
@@ -43,7 +43,7 @@ func newForwardInterceptor(htlcSwitch htlcswitch.InterceptableHtlcForwarder,
 }
 
 // run sends the intercepted packets to the client and receives the
-// corersponding responses. On one hand it registered itself as an interceptor
+// corresponding responses. On one hand it registered itself as an interceptor
 // that receives the switch packets and on the other hand launches a go routine
 // to read from the client stream.
 // To coordinate all this and make sure it is safe for concurrent access all
diff --git a/lnrpc/routerrpc/router_server.go b/lnrpc/routerrpc/router_server.go
index 194bdc996f..a8aa4fbe5e 100644
--- a/lnrpc/routerrpc/router_server.go
+++ b/lnrpc/routerrpc/router_server.go
@@ -1487,7 +1487,7 @@ func (s *Server) SubscribeHtlcEvents(req *SubscribeHtlcEventsRequest,
 
 // HtlcInterceptor is a bidirectional stream for streaming interception
 // requests to the caller.
-// Upon connection it does the following:
+// Upon connection, it does the following:
 // 1. Check if there is already a live stream, if yes it rejects the request.
 // 2. Registered a ForwardInterceptor
 // 3. Delivers to the caller every √√ and detect his answer.
@@ -1500,7 +1500,7 @@ func (s *Server) HtlcInterceptor(stream Router_HtlcInterceptorServer) error {
 	}
 	defer atomic.CompareAndSwapInt32(&s.forwardInterceptorActive, 1, 0)
 
-	// run the forward interceptor.
+	// Run the forward interceptor.
 	return newForwardInterceptor(
 		s.cfg.RouterBackend.InterceptableForwarder, stream,
 	).run()

From 8b1d9c92487d16ee062f5b2885f178814685f784 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Tue, 9 Apr 2024 14:13:09 +0100
Subject: [PATCH 02/15] htlcswitch: add missing method doc

---
 htlcswitch/interceptable_switch.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/htlcswitch/interceptable_switch.go b/htlcswitch/interceptable_switch.go
index 62f7c93dd8..2f180e257f 100644
--- a/htlcswitch/interceptable_switch.go
+++ b/htlcswitch/interceptable_switch.go
@@ -363,6 +363,8 @@ func (s *InterceptableSwitch) setInterceptor(interceptor ForwardInterceptor) {
 	})
 }
 
+// resolve processes a HTLC given the resolution type specified by the
+// intercepting client.
 func (s *InterceptableSwitch) resolve(res *FwdResolution) error {
 	intercepted, err := s.heldHtlcSet.pop(res.Key)
 	if err != nil {

From 71c32511dd2bcc418fe8ad3cca8190642dedb034 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Mon, 29 Apr 2024 11:28:22 +0100
Subject: [PATCH 03/15] lnwire: add type `CustomRecords`

This commit introduces the `CustomRecords` type in the `lnwire` package,
designed to hold arbitrary byte slices. Each entry in this map can
associate with TLV type values that are greater than or equal to 65536.
---
 lnwire/custom_records.go   | 169 +++++++++++++++++++++++++++++++++++++
 lnwire/encoding.go         |  16 ++++
 lnwire/extra_bytes_test.go |   8 --
 3 files changed, 185 insertions(+), 8 deletions(-)
 create mode 100644 lnwire/custom_records.go

diff --git a/lnwire/custom_records.go b/lnwire/custom_records.go
new file mode 100644
index 0000000000..e493208152
--- /dev/null
+++ b/lnwire/custom_records.go
@@ -0,0 +1,169 @@
+package lnwire
+
+import (
+	"bytes"
+	"fmt"
+	"sort"
+
+	"github.com/lightningnetwork/lnd/tlv"
+)
+
+const (
+	// MinCustomRecordsTlvType is the minimum custom records TLV type as
+	// defined in BOLT 01.
+	MinCustomRecordsTlvType = 65536
+)
+
+// CustomRecords stores a set of custom key/value pairs. Map keys are TLV types
+// which must be greater than or equal to MinCustomRecordsTlvType.
+type CustomRecords map[uint64][]byte
+
+// NewCustomRecordsFromTlvTypeMap creates a new CustomRecords instance from a
+// tlv.TypeMap.
+func NewCustomRecordsFromTlvTypeMap(tlvMap tlv.TypeMap) (CustomRecords,
+	error) {
+
+	customRecords := make(CustomRecords, len(tlvMap))
+	for k, v := range tlvMap {
+		customRecords[uint64(k)] = v
+	}
+
+	// Validate the custom records.
+	err := customRecords.Validate()
+	if err != nil {
+		return nil, fmt.Errorf("custom records from tlv map "+
+			"validation error: %v", err)
+	}
+
+	return customRecords, nil
+}
+
+// NewCustomRecordsFromTlvBlob creates a new CustomRecords instance from a
+// tlv.Blob.
+func NewCustomRecordsFromTlvBlob(b tlv.Blob) (CustomRecords, error) {
+	stream, err := tlv.NewStream()
+	if err != nil {
+		return nil, fmt.Errorf("error creating stream: %w", err)
+	}
+
+	typeMap, err := stream.DecodeWithParsedTypes(bytes.NewReader(b))
+	if err != nil {
+		return nil, fmt.Errorf("error decoding HTLC record: %w", err)
+	}
+
+	return NewCustomRecordsFromTlvTypeMap(typeMap)
+}
+
+// Validate checks that all custom records are in the custom type range.
+func (c CustomRecords) Validate() error {
+	if c == nil {
+		return nil
+	}
+
+	for key := range c {
+		if key < MinCustomRecordsTlvType {
+			return fmt.Errorf("custom records entry with TLV "+
+				"type below min: %d", MinCustomRecordsTlvType)
+		}
+	}
+
+	return nil
+}
+
+// Copy returns a copy of the custom records.
+func (c CustomRecords) Copy() CustomRecords {
+	customRecords := make(CustomRecords, len(c))
+	for k, v := range c {
+		customRecords[k] = v
+	}
+
+	return customRecords
+}
+
+// ExtendRecordProducers extends the given records slice with the custom
+// records. The resultant records slice will be sorted if the given records
+// slice contains TLV types greater than or equal to MinCustomRecordsTlvType.
+func (c CustomRecords) ExtendRecordProducers(
+	producers []tlv.RecordProducer) ([]tlv.RecordProducer, error) {
+
+	// If the custom records are nil or empty, there is nothing to do.
+	if len(c) == 0 {
+		return producers, nil
+	}
+
+	// Validate the custom records.
+	err := c.Validate()
+	if err != nil {
+		return nil, err
+	}
+
+	// Ensure that the existing records slice TLV types are not also present
+	// in the custom records. If they are, the resultant extended records
+	// slice would erroneously contain duplicate TLV types.
+	for _, rp := range producers {
+		record := rp.Record()
+		recordTlvType := uint64(record.Type())
+
+		_, foundDuplicateTlvType := c[recordTlvType]
+		if foundDuplicateTlvType {
+			return nil, fmt.Errorf("custom records contains a TLV "+
+				"type that is already present in the "+
+				"existing records: %d", recordTlvType)
+		}
+	}
+
+	// Convert the custom records map to a TLV record producer slice and
+	// append them to the exiting records slice.
+	crRecords := tlv.MapToRecords(c)
+	for _, record := range crRecords {
+		r := recordProducer{record}
+		producers = append(producers, &r)
+	}
+
+	// If the records slice which was given as an argument included TLV
+	// values greater than or equal to the minimum custom records TLV type
+	// we will sort the extended records slice to ensure that it is ordered
+	// correctly.
+	sort.Slice(producers, func(i, j int) bool {
+		recordI := producers[i].Record()
+		recordJ := producers[j].Record()
+		return recordI.Type() < recordJ.Type()
+	})
+
+	return producers, nil
+}
+
+// RecordProducers returns a slice of record producers for the custom records.
+func (c CustomRecords) RecordProducers() []tlv.RecordProducer {
+	// If the custom records are nil or empty, return an empty slice.
+	if len(c) == 0 {
+		return nil
+	}
+
+	// Convert the custom records map to a TLV record producer slice.
+	records := tlv.MapToRecords(c)
+
+	// Convert the records to record producers.
+	producers := make([]tlv.RecordProducer, len(records))
+	for i, record := range records {
+		producers[i] = &recordProducer{record}
+	}
+
+	return producers
+}
+
+// Serialize serializes the custom records into a byte slice.
+func (c CustomRecords) Serialize() ([]byte, error) {
+	records := tlv.MapToRecords(c)
+	stream, err := tlv.NewStream(records...)
+	if err != nil {
+		return nil, fmt.Errorf("error creating stream: %w", err)
+	}
+
+	var b bytes.Buffer
+	if err := stream.Encode(&b); err != nil {
+		return nil, fmt.Errorf("error encoding custom records: %w", err)
+	}
+
+	return b.Bytes(), nil
+}
diff --git a/lnwire/encoding.go b/lnwire/encoding.go
index e04b2b01d4..72000f81d1 100644
--- a/lnwire/encoding.go
+++ b/lnwire/encoding.go
@@ -1,5 +1,7 @@
 package lnwire
 
+import "github.com/lightningnetwork/lnd/tlv"
+
 // QueryEncoding is an enum-like type that represents exactly how a set data is
 // encoded on the wire.
 type QueryEncoding uint8
@@ -15,3 +17,17 @@ const (
 	// NOTE: this should no longer be used or accepted.
 	EncodingSortedZlib QueryEncoding = 1
 )
+
+// recordProducer is a simple helper struct that implements the
+// tlv.RecordProducer interface.
+type recordProducer struct {
+	record tlv.Record
+}
+
+// Record returns the underlying record.
+func (r *recordProducer) Record() tlv.Record {
+	return r.record
+}
+
+// Ensure that recordProducer implements the tlv.RecordProducer interface.
+var _ tlv.RecordProducer = (*recordProducer)(nil)
diff --git a/lnwire/extra_bytes_test.go b/lnwire/extra_bytes_test.go
index fd9f28841d..97a908bcec 100644
--- a/lnwire/extra_bytes_test.go
+++ b/lnwire/extra_bytes_test.go
@@ -86,14 +86,6 @@ func TestExtraOpaqueDataEncodeDecode(t *testing.T) {
 	}
 }
 
-type recordProducer struct {
-	record tlv.Record
-}
-
-func (r *recordProducer) Record() tlv.Record {
-	return r.record
-}
-
 // TestExtraOpaqueDataPackUnpackRecords tests that we're able to pack a set of
 // tlv.Records into a stream, and unpack them on the other side to obtain the
 // same set of records.

From 795aff5f42b73e990df4f85c981c790ca1a6c4c7 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Fri, 3 May 2024 15:24:42 +0100
Subject: [PATCH 04/15] lnwire: add unit tests for
 `ExtraOpaqueData.PackRecords`

---
 lnwire/extra_bytes_test.go | 63 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/lnwire/extra_bytes_test.go b/lnwire/extra_bytes_test.go
index 97a908bcec..b05b19db5f 100644
--- a/lnwire/extra_bytes_test.go
+++ b/lnwire/extra_bytes_test.go
@@ -143,3 +143,66 @@ func TestExtraOpaqueDataPackUnpackRecords(t *testing.T) {
 		t.Fatalf("type2 not found in typeMap")
 	}
 }
+
+// TestPackRecords tests that we're able to pack a set of records into an
+// ExtraOpaqueData instance, and then extract them back out. Crucially, we'll
+// ensure that records can be packed in any order, and we'll ensure that the
+// unpacked records are valid.
+func TestPackRecords(t *testing.T) {
+	t.Parallel()
+
+	// Create an empty ExtraOpaqueData instance.
+	extraBytes := ExtraOpaqueData{}
+
+	var (
+		// Record type 1.
+		tlvType1     tlv.TlvType1
+		recordBytes1 = []byte("recordBytes1")
+		tlvRecord1   = tlv.NewPrimitiveRecord[tlv.TlvType1](
+			recordBytes1,
+		)
+
+		// Record type 2.
+		tlvType2     tlv.TlvType2
+		recordBytes2 = []byte("recordBytes2")
+		tlvRecord2   = tlv.NewPrimitiveRecord[tlv.TlvType2](
+			recordBytes2,
+		)
+
+		// Record type 3.
+		tlvType3     tlv.TlvType3
+		recordBytes3 = []byte("recordBytes3")
+		tlvRecord3   = tlv.NewPrimitiveRecord[tlv.TlvType3](
+			recordBytes3,
+		)
+	)
+
+	// Pack records 1 and 2 into the ExtraOpaqueData instance.
+	err := extraBytes.PackRecords(
+		[]tlv.RecordProducer{&tlvRecord1, &tlvRecord2}...,
+	)
+	require.NoError(t, err)
+
+	// Examine the records that were packed into the ExtraOpaqueData.
+	extractedRecords, err := extraBytes.ExtractRecords()
+	require.NoError(t, err)
+
+	require.Equal(t, 2, len(extractedRecords))
+	require.Equal(t, recordBytes1, extractedRecords[tlvType1.TypeVal()])
+	require.Equal(t, recordBytes2, extractedRecords[tlvType2.TypeVal()])
+
+	// Pack records 1, 2, and 3 into the ExtraOpaqueData instance.
+	err = extraBytes.PackRecords(
+		[]tlv.RecordProducer{&tlvRecord3, &tlvRecord1, &tlvRecord2}...,
+	)
+	require.NoError(t, err)
+
+	// Examine the records that were packed into the ExtraOpaqueData.
+	extractedRecords, err = extraBytes.ExtractRecords()
+	require.NoError(t, err)
+
+	require.Equal(t, 3, len(extractedRecords))
+	require.Equal(t, recordBytes1, extractedRecords[tlvType1.TypeVal()])
+	require.Equal(t, recordBytes2, extractedRecords[tlvType2.TypeVal()])
+	require.Equal(t, recordBytes3, extractedRecords[tlvType3.TypeVal()])
+}

From 41a5b9abf81ce96fa29f5c06a5bb7740d603e6e2 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Fri, 3 May 2024 18:36:00 +0100
Subject: [PATCH 05/15] lnwire: add `ExtraOpaqueData` helper functions and
 methods

- Add instance constructor `NewExtraOpaqueDataFromTlvTypeMap`.
- Add method `Copy`.
- Add method `RecordProducers`.
---
 lnwire/extra_bytes.go | 74 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/lnwire/extra_bytes.go b/lnwire/extra_bytes.go
index 0ebf48f57d..b90988a771 100644
--- a/lnwire/extra_bytes.go
+++ b/lnwire/extra_bytes.go
@@ -15,6 +15,41 @@ import (
 // upgrades to the network in a forwards compatible manner.
 type ExtraOpaqueData []byte
 
+// NewExtraOpaqueDataFromTlvTypeMap creates a new ExtraOpaqueData instance from
+// a tlv.TypeMap.
+func NewExtraOpaqueDataFromTlvTypeMap(tlvMap tlv.TypeMap) (ExtraOpaqueData,
+	error) {
+
+	extraData := ExtraOpaqueData{}
+
+	// If the tlv map is empty, return an empty extra data instance.
+	if len(tlvMap) == 0 {
+		return extraData, nil
+	}
+
+	// Convert the tlv map to a generic type map.
+	tlvMapGeneric := make(map[uint64][]byte)
+	for k, v := range tlvMap {
+		tlvMapGeneric[uint64(k)] = v
+	}
+
+	// Convert the generic type map to a slice of records.
+	records := tlv.MapToRecords(tlvMapGeneric)
+
+	// Encode the records into the extra data byte slice.
+	tlvStream, err := tlv.NewStream(records...)
+	if err != nil {
+		return nil, err
+	}
+
+	var bytesWriter bytes.Buffer
+	if err := tlvStream.Encode(&bytesWriter); err != nil {
+		return nil, err
+	}
+
+	return bytesWriter.Bytes(), nil
+}
+
 // Encode attempts to encode the raw extra bytes into the passed io.Writer.
 func (e *ExtraOpaqueData) Encode(w *bytes.Buffer) error {
 	eBytes := []byte((*e)[:])
@@ -105,6 +140,45 @@ func (e *ExtraOpaqueData) ExtractRecords(recordProducers ...tlv.RecordProducer)
 	return tlvStream.DecodeWithParsedTypesP2P(extraBytesReader)
 }
 
+// RecordProducers parses ExtraOpaqueData into a slice of TLV record producers
+// by interpreting it as a TLV map.
+func (e *ExtraOpaqueData) RecordProducers() ([]tlv.RecordProducer, error) {
+	var recordProducers []tlv.RecordProducer
+
+	// If the instance is nil or empty, return an empty slice.
+	if e == nil || len(*e) == 0 {
+		return recordProducers, nil
+	}
+
+	// Parse the extra opaque data as a TLV map.
+	tlvMap, err := e.ExtractRecords()
+	if err != nil {
+		return nil, err
+	}
+
+	// Convert the TLV map into a slice of records.
+	tlvMapGeneric := make(map[uint64][]byte)
+	for k, v := range tlvMap {
+		tlvMapGeneric[uint64(k)] = v
+	}
+	records := tlv.MapToRecords(tlvMapGeneric)
+
+	// Convert the records to record producers.
+	recordProducers = make([]tlv.RecordProducer, len(records))
+	for i, record := range records {
+		recordProducers[i] = &recordProducer{record}
+	}
+
+	return recordProducers, nil
+}
+
+// Copy returns a copy of the target ExtraOpaqueData instance.
+func (e *ExtraOpaqueData) Copy() ExtraOpaqueData {
+	copyData := make([]byte, len(*e))
+	copy(copyData, *e)
+	return copyData
+}
+
 // EncodeMessageExtraData encodes the given recordProducers into the given
 // extraData.
 func EncodeMessageExtraData(extraData *ExtraOpaqueData,

From 2b3618c14d2aa0a0f203cf4ea84dc801668ccd29 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Sat, 13 Apr 2024 12:29:41 +0100
Subject: [PATCH 06/15] lnwire: add custom records field to type
 `UpdateAddHtlc`

- Introduce the field `CustomRecords` to the type `UpdateAddHtlc`.
- Encode and decode the new field into the `ExtraData` field of
  the `update_add_htlc` wire message.
---
 lnwire/update_add_htlc.go | 101 ++++++++++++++++++++++++++++++++++----
 peer/brontide.go          |   6 +--
 2 files changed, 94 insertions(+), 13 deletions(-)

diff --git a/lnwire/update_add_htlc.go b/lnwire/update_add_htlc.go
index 8a40710e82..3669f81e89 100644
--- a/lnwire/update_add_htlc.go
+++ b/lnwire/update_add_htlc.go
@@ -2,6 +2,7 @@ package lnwire
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 
 	"github.com/btcsuite/btcd/btcec/v2"
@@ -72,6 +73,11 @@ type UpdateAddHTLC struct {
 	// next hop for this htlc.
 	BlindingPoint BlindingPointRecord
 
+	// CustomRecords maps TLV types to byte slices, storing arbitrary data
+	// intended for inclusion in the ExtraData field of the UpdateAddHTLC
+	// message.
+	CustomRecords CustomRecords
+
 	// ExtraData is the set of data that was appended to this message to
 	// fill out the full maximum transport message size. These fields can
 	// be used to specify optional data such as custom TLV fields.
@@ -92,6 +98,10 @@ var _ Message = (*UpdateAddHTLC)(nil)
 //
 // This is part of the lnwire.Message interface.
 func (c *UpdateAddHTLC) Decode(r io.Reader, pver uint32) error {
+	// msgExtraData is a temporary variable used to read the message extra
+	// data field from the reader.
+	var msgExtraData ExtraOpaqueData
+
 	if err := ReadElements(r,
 		&c.ChanID,
 		&c.ID,
@@ -99,25 +109,76 @@ func (c *UpdateAddHTLC) Decode(r io.Reader, pver uint32) error {
 		c.PaymentHash[:],
 		&c.Expiry,
 		c.OnionBlob[:],
-		&c.ExtraData,
+		&msgExtraData,
 	); err != nil {
 		return err
 	}
 
+	// Extract TLV records from the extra data field.
 	blindingRecord := c.BlindingPoint.Zero()
-	tlvMap, err := c.ExtraData.ExtractRecords(&blindingRecord)
+
+	extraDataTlvMap, err := msgExtraData.ExtractRecords(&blindingRecord)
 	if err != nil {
 		return err
 	}
 
-	if val, ok := tlvMap[c.BlindingPoint.TlvType()]; ok && val == nil {
+	val, ok := extraDataTlvMap[c.BlindingPoint.TlvType()]
+	if ok && val == nil {
 		c.BlindingPoint = tlv.SomeRecordT(blindingRecord)
+
+		// Remove the entry from the TLV map. Anything left in the map
+		// will be included in the custom records field.
+		delete(extraDataTlvMap, c.BlindingPoint.TlvType())
+	}
+
+	// Any records from the extra data TLV map which are in the custom
+	// records TLV type range will be included in the custom records field
+	// and removed from the extra data field.
+	customRecordsTlvMap := make(tlv.TypeMap, len(extraDataTlvMap))
+	for k, v := range extraDataTlvMap {
+		// Skip records that are not in the custom records TLV type
+		// range.
+		if k < MinCustomRecordsTlvType {
+			continue
+		}
+
+		// Include the record in the custom records map.
+		customRecordsTlvMap[k] = v
+
+		// Now that the record is included in the custom records map,
+		// we can remove it from the extra data TLV map.
+		delete(extraDataTlvMap, k)
+	}
+
+	// Set the custom records field to the custom records specific TLV
+	// record map.
+	customRecords, err := NewCustomRecordsFromTlvTypeMap(
+		customRecordsTlvMap,
+	)
+	if err != nil {
+		return err
+	}
+	c.CustomRecords = customRecords
+
+	// Set custom records to nil if we didn't parse anything out of it so
+	// that we can use assert.Equal in tests.
+	if len(customRecordsTlvMap) == 0 {
+		c.CustomRecords = nil
 	}
 
 	// Set extra data to nil if we didn't parse anything out of it so that
 	// we can use assert.Equal in tests.
-	if len(tlvMap) == 0 {
+	if len(extraDataTlvMap) == 0 {
 		c.ExtraData = nil
+		return nil
+	}
+
+	// Encode the remaining records back into the extra data field. These
+	// records are not in the custom records TLV type range and do not
+	// have associated fields in the UpdateAddHTLC struct.
+	c.ExtraData, err = NewExtraOpaqueDataFromTlvTypeMap(extraDataTlvMap)
+	if err != nil {
+		return err
 	}
 
 	return nil
@@ -152,21 +213,41 @@ func (c *UpdateAddHTLC) Encode(w *bytes.Buffer, pver uint32) error {
 		return err
 	}
 
-	// Only include blinding point in extra data if present.
-	var records []tlv.RecordProducer
+	// Construct a slice of all the records that we should include in the
+	// message extra data field. We will start by including any records from
+	// the extra data field.
+	msgExtraDataRecords, err := c.ExtraData.RecordProducers()
+	if err != nil {
+		return err
+	}
 
+	// Include blinding point in extra data if specified.
 	c.BlindingPoint.WhenSome(func(b tlv.RecordT[BlindingPointTlvType,
 		*btcec.PublicKey]) {
 
-		records = append(records, &b)
+		msgExtraDataRecords = append(msgExtraDataRecords, &b)
 	})
 
-	err := EncodeMessageExtraData(&c.ExtraData, records...)
-	if err != nil {
+	// Include custom records in the extra data wire field if they are
+	// present. Ensure that the custom records are validated before encoding
+	// them.
+	if err := c.CustomRecords.Validate(); err != nil {
+		return fmt.Errorf("custom records validation error: %w", err)
+	}
+
+	// Extend the message extra data records slice with TLV records from the
+	// custom records field.
+	customTlvRecords := c.CustomRecords.RecordProducers()
+	msgExtraDataRecords = append(msgExtraDataRecords, customTlvRecords...)
+
+	// We will now construct the message extra data field that will be
+	// encoded into the byte writer.
+	var msgExtraData ExtraOpaqueData
+	if err := msgExtraData.PackRecords(msgExtraDataRecords...); err != nil {
 		return err
 	}
 
-	return WriteBytes(w, c.ExtraData)
+	return WriteBytes(w, msgExtraData)
 }
 
 // MsgType returns the integer uniquely identifying this message type on the
diff --git a/peer/brontide.go b/peer/brontide.go
index b9a9f68ca1..e084bb88a5 100644
--- a/peer/brontide.go
+++ b/peer/brontide.go
@@ -2024,9 +2024,9 @@ func messageSummary(msg lnwire.Message) string {
 		)
 
 		return fmt.Sprintf("chan_id=%v, id=%v, amt=%v, expiry=%v, "+
-			"hash=%x, blinding_point=%x", msg.ChanID, msg.ID,
-			msg.Amount, msg.Expiry, msg.PaymentHash[:],
-			blindingPoint)
+			"hash=%x, blinding_point=%x, custom_records=%v",
+			msg.ChanID, msg.ID, msg.Amount, msg.Expiry,
+			msg.PaymentHash[:], blindingPoint, msg.CustomRecords)
 
 	case *lnwire.UpdateFailHTLC:
 		return fmt.Sprintf("chan_id=%v, id=%v, reason=%x", msg.ChanID,

From b93d2885e362b6cdf3521d7e8e7627d1e9a6a34d Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Mon, 29 Apr 2024 22:37:16 +0100
Subject: [PATCH 07/15] lnwire: add encoding/decoding unit tests for
 `UpdateAddHtlc` message

---
 lnwire/test_utils.go           |  29 +++++
 lnwire/update_add_htlc_test.go | 216 +++++++++++++++++++++++++++++++++
 2 files changed, 245 insertions(+)
 create mode 100644 lnwire/test_utils.go
 create mode 100644 lnwire/update_add_htlc_test.go

diff --git a/lnwire/test_utils.go b/lnwire/test_utils.go
new file mode 100644
index 0000000000..2a258eb97a
--- /dev/null
+++ b/lnwire/test_utils.go
@@ -0,0 +1,29 @@
+package lnwire
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+
+	"github.com/btcsuite/btcd/btcec/v2"
+)
+
+// pubkeyFromHex parses a Bitcoin public key from a hex encoded string.
+func pubkeyFromHex(keyHex string) (*btcec.PublicKey, error) {
+	bytes, err := hex.DecodeString(keyHex)
+	if err != nil {
+		return nil, err
+	}
+
+	return btcec.ParsePubKey(bytes)
+}
+
+// generateRandomBytes returns a slice of n random bytes.
+func generateRandomBytes(n int) ([]byte, error) {
+	b := make([]byte, n)
+	_, err := rand.Read(b)
+	if err != nil {
+		return nil, err
+	}
+
+	return b, nil
+}
diff --git a/lnwire/update_add_htlc_test.go b/lnwire/update_add_htlc_test.go
new file mode 100644
index 0000000000..5a05154615
--- /dev/null
+++ b/lnwire/update_add_htlc_test.go
@@ -0,0 +1,216 @@
+package lnwire
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/lightningnetwork/lnd/tlv"
+	"github.com/stretchr/testify/require"
+)
+
+// testCase is a test case for the UpdateAddHTLC message.
+type testCase struct {
+	// Msg is the message to be encoded and decoded.
+	Msg UpdateAddHTLC
+
+	// ExpectEncodeError is a flag that indicates whether we expect the
+	// encoding of the message to fail.
+	ExpectEncodeError bool
+}
+
+// generateTestCases generates a set of UpdateAddHTLC message test cases.
+func generateTestCases(t *testing.T) []testCase {
+	// Firstly, we'll set basic values for the message fields.
+	//
+	// Generate random channel ID.
+	chanIDBytes, err := generateRandomBytes(32)
+	require.NoError(t, err)
+
+	var chanID ChannelID
+	copy(chanID[:], chanIDBytes)
+
+	// Generate random payment hash.
+	paymentHashBytes, err := generateRandomBytes(32)
+	require.NoError(t, err)
+
+	var paymentHash [32]byte
+	copy(paymentHash[:], paymentHashBytes)
+
+	// Generate random onion blob.
+	onionBlobBytes, err := generateRandomBytes(OnionPacketSize)
+	require.NoError(t, err)
+
+	var onionBlob [OnionPacketSize]byte
+	copy(onionBlob[:], onionBlobBytes)
+
+	// Define the blinding point.
+	blinding, err := pubkeyFromHex(
+		"0228f2af0abe322403480fb3ee172f7f1601e67d1da6cad40b54c4468d4" +
+			"8236c39",
+	)
+	require.NoError(t, err)
+
+	blindingPoint := tlv.SomeRecordT(
+		tlv.NewPrimitiveRecord[BlindingPointTlvType](blinding),
+	)
+
+	// Define custom records.
+	recordKey1 := uint64(MinCustomRecordsTlvType + 1)
+	recordValue1, err := generateRandomBytes(10)
+	require.NoError(t, err)
+
+	recordKey2 := uint64(MinCustomRecordsTlvType + 2)
+	recordValue2, err := generateRandomBytes(10)
+	require.NoError(t, err)
+
+	customRecords := CustomRecords{
+		recordKey1: recordValue1,
+		recordKey2: recordValue2,
+	}
+
+	// Construct an instance of extra data that contains records with TLV
+	// types below the minimum custom records threshold and that lack
+	// corresponding fields in the message struct. Content should persist in
+	// the extra data field after encoding and decoding.
+	var (
+		recordBytes45 = []byte("recordBytes45")
+		tlvRecord45   = tlv.NewPrimitiveRecord[tlv.TlvType45](
+			recordBytes45,
+		)
+
+		recordBytes55 = []byte("recordBytes55")
+		tlvRecord55   = tlv.NewPrimitiveRecord[tlv.TlvType55](
+			recordBytes55,
+		)
+	)
+
+	var extraData ExtraOpaqueData
+	err = extraData.PackRecords(
+		[]tlv.RecordProducer{&tlvRecord45, &tlvRecord55}...,
+	)
+	require.NoError(t, err)
+
+	// Define test cases.
+	testCases := make([]testCase, 0)
+
+	testCases = append(testCases, testCase{
+		Msg: UpdateAddHTLC{
+			ChanID:        chanID,
+			ID:            42,
+			Amount:        MilliSatoshi(1000),
+			PaymentHash:   paymentHash,
+			Expiry:        43,
+			OnionBlob:     onionBlob,
+			BlindingPoint: blindingPoint,
+			CustomRecords: customRecords,
+			ExtraData:     extraData,
+		},
+	})
+
+	// Add a test case where the blinding point field is not populated.
+	testCases = append(testCases, testCase{
+		Msg: UpdateAddHTLC{
+			ChanID:        chanID,
+			ID:            42,
+			Amount:        MilliSatoshi(1000),
+			PaymentHash:   paymentHash,
+			Expiry:        43,
+			OnionBlob:     onionBlob,
+			CustomRecords: customRecords,
+		},
+	})
+
+	// Add a test case where the custom records field is not populated.
+	testCases = append(testCases, testCase{
+		Msg: UpdateAddHTLC{
+			ChanID:        chanID,
+			ID:            42,
+			Amount:        MilliSatoshi(1000),
+			PaymentHash:   paymentHash,
+			Expiry:        43,
+			OnionBlob:     onionBlob,
+			BlindingPoint: blindingPoint,
+		},
+	})
+
+	// Add a case where the custom records are invlaid.
+	invalidCustomRecords := CustomRecords{
+		MinCustomRecordsTlvType - 1: recordValue1,
+	}
+
+	testCases = append(testCases, testCase{
+		Msg: UpdateAddHTLC{
+			ChanID:        chanID,
+			ID:            42,
+			Amount:        MilliSatoshi(1000),
+			PaymentHash:   paymentHash,
+			Expiry:        43,
+			OnionBlob:     onionBlob,
+			BlindingPoint: blindingPoint,
+			CustomRecords: invalidCustomRecords,
+		},
+		ExpectEncodeError: true,
+	})
+
+	return testCases
+}
+
+// TestUpdateAddHtlcEncodeDecode tests UpdateAddHTLC message encoding and
+// decoding for all supported field values.
+func TestUpdateAddHtlcEncodeDecode(t *testing.T) {
+	t.Parallel()
+
+	// Generate test cases.
+	testCases := generateTestCases(t)
+
+	// Execute test cases.
+	for tcIdx, tc := range testCases {
+		t.Log("Running test case", tcIdx)
+
+		// Encode test case message.
+		var buf bytes.Buffer
+		err := tc.Msg.Encode(&buf, 0)
+
+		// Check if we expect an encoding error.
+		if tc.ExpectEncodeError {
+			require.Error(t, err)
+			continue
+		}
+		require.NoError(t, err)
+
+		// Decode the encoded message bytes message.
+		var actualMsg UpdateAddHTLC
+		decodeReader := bytes.NewReader(buf.Bytes())
+		err = actualMsg.Decode(decodeReader, 0)
+		require.NoError(t, err)
+
+		// Compare the two messages to ensure equality one field at a
+		// time.
+		require.Equal(t, tc.Msg.ChanID, actualMsg.ChanID)
+		require.Equal(t, tc.Msg.ID, actualMsg.ID)
+		require.Equal(t, tc.Msg.Amount, actualMsg.Amount)
+		require.Equal(t, tc.Msg.PaymentHash, actualMsg.PaymentHash)
+		require.Equal(t, tc.Msg.OnionBlob, actualMsg.OnionBlob)
+		require.Equal(t, tc.Msg.BlindingPoint, actualMsg.BlindingPoint)
+
+		// Check that the custom records field is as expected.
+		if len(tc.Msg.CustomRecords) == 0 {
+			require.Len(t, actualMsg.CustomRecords, 0)
+		} else {
+			require.Equal(
+				t, tc.Msg.CustomRecords,
+				actualMsg.CustomRecords,
+			)
+		}
+
+		// Check that the extra data field is as expected.
+		if len(tc.Msg.ExtraData) == 0 {
+			require.Len(t, actualMsg.ExtraData, 0)
+		} else {
+			require.Equal(
+				t, tc.Msg.ExtraData,
+				actualMsg.ExtraData,
+			)
+		}
+	}
+}

From 6fa2db066395000be8a75eb1fa52862424dea366 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Tue, 14 May 2024 12:51:02 +0100
Subject: [PATCH 08/15] lnwire: rand CustomRecords for UpdateAddHTLC
 encode/decode fuzz test

This commit adds a random `CustomRecords` field to the `UpdateAddHTLC`
message encode/decode unit test.
---
 lnwire/lnwire_test.go | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/lnwire/lnwire_test.go b/lnwire/lnwire_test.go
index e4c5c6baf5..b073103984 100644
--- a/lnwire/lnwire_test.go
+++ b/lnwire/lnwire_test.go
@@ -389,6 +389,45 @@ func TestEmptyMessageUnknownType(t *testing.T) {
 	}
 }
 
+// randCustomRecords generates a random set of custom records for testing.
+func randCustomRecords(t *testing.T, r *rand.Rand) CustomRecords {
+	var (
+		customRecords = CustomRecords{}
+
+		// We'll generate a random number of records,
+		// between 0 and 10.
+		numRecords = r.Intn(10)
+	)
+
+	// For each record, we'll generate a random key and
+	// value.
+	for i := 0; i < numRecords; i++ {
+		// Keys must be equal to or greater than
+		// MinCustomRecordsTlvType.
+		keyOffset := uint64(r.Intn(100))
+		key := MinCustomRecordsTlvType + keyOffset
+
+		// Values are byte slices of any length.
+		value := make([]byte, r.Intn(100))
+		_, err := r.Read(value)
+		require.NoError(t, err)
+
+		customRecords[key] = value
+	}
+
+	// Validate the custom records as a sanity check.
+	err := customRecords.Validate()
+	require.NoError(t, err)
+
+	// If by chance we end up with an empty set of custom records, we'll
+	// set it to nil to simplify test comparisons.
+	if len(customRecords) == 0 {
+		customRecords = nil
+	}
+
+	return customRecords
+}
+
 // TestLightningWireProtocol uses the testing/quick package to create a series
 // of fuzz tests to attempt to break a primary scenario which is implemented as
 // property based testing scenario.
@@ -1353,6 +1392,8 @@ func TestLightningWireProtocol(t *testing.T) {
 			_, err = r.Read(req.OnionBlob[:])
 			require.NoError(t, err)
 
+			req.CustomRecords = randCustomRecords(t, r)
+
 			// Generate a blinding point 50% of the time, since not
 			// all update adds will use route blinding.
 			if r.Int31()%2 == 0 {

From d247cc94987e624b8085c778c3c5c73fc76a0385 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Fri, 3 May 2024 16:22:05 +0100
Subject: [PATCH 09/15] lnwire: add custom records field to type
 `UpdateFulfillHtlc`

- Introduce the field `CustomRecords` to the type `UpdateFulfillHtlc`.
- Encode and decode the new field into the `ExtraData` field of the
`update_fulfill_htlc` wire message.
- Empty `ExtraData` field is set to `nil`.
---
 htlcswitch/payment_result_test.go |   1 -
 lnwire/update_fulfill_htlc.go     | 103 +++++++++++++++++++++++++++++-
 peer/brontide.go                  |   5 +-
 3 files changed, 103 insertions(+), 6 deletions(-)

diff --git a/htlcswitch/payment_result_test.go b/htlcswitch/payment_result_test.go
index 99e8074e58..664197f765 100644
--- a/htlcswitch/payment_result_test.go
+++ b/htlcswitch/payment_result_test.go
@@ -38,7 +38,6 @@ func TestNetworkResultSerialization(t *testing.T) {
 		ChanID:          chanID,
 		ID:              2,
 		PaymentPreimage: preimage,
-		ExtraData:       make([]byte, 0),
 	}
 
 	fail := &lnwire.UpdateFailHTLC{
diff --git a/lnwire/update_fulfill_htlc.go b/lnwire/update_fulfill_htlc.go
index 275a37c87c..3ec4b19cbd 100644
--- a/lnwire/update_fulfill_htlc.go
+++ b/lnwire/update_fulfill_htlc.go
@@ -2,7 +2,10 @@ package lnwire
 
 import (
 	"bytes"
+	"fmt"
 	"io"
+
+	"github.com/lightningnetwork/lnd/tlv"
 )
 
 // UpdateFulfillHTLC is sent by Alice to Bob when she wishes to settle a
@@ -23,6 +26,10 @@ type UpdateFulfillHTLC struct {
 	// HTLC.
 	PaymentPreimage [32]byte
 
+	// CustomRecords maps TLV types to byte slices, storing arbitrary data
+	// intended for inclusion in the ExtraData field.
+	CustomRecords CustomRecords
+
 	// ExtraData is the set of data that was appended to this message to
 	// fill out the full maximum transport message size. These fields can
 	// be used to specify optional data such as custom TLV fields.
@@ -49,12 +56,75 @@ var _ Message = (*UpdateFulfillHTLC)(nil)
 //
 // This is part of the lnwire.Message interface.
 func (c *UpdateFulfillHTLC) Decode(r io.Reader, pver uint32) error {
-	return ReadElements(r,
+	// msgExtraData is a temporary variable used to read the message extra
+	// data field from the reader.
+	var msgExtraData ExtraOpaqueData
+
+	if err := ReadElements(r,
 		&c.ChanID,
 		&c.ID,
 		c.PaymentPreimage[:],
-		&c.ExtraData,
+		&msgExtraData,
+	); err != nil {
+		return err
+	}
+
+	// Extract TLV records from the message extra data field.
+	extraDataTlvMap, err := msgExtraData.ExtractRecords()
+	if err != nil {
+		return err
+	}
+
+	// Any records from the extra data TLV map which are in the custom
+	// records TLV type range will be included in the custom records field
+	// and removed from the extra data field.
+	customRecordsTlvMap := make(tlv.TypeMap, len(extraDataTlvMap))
+	for k, v := range extraDataTlvMap {
+		// Skip records that are not in the custom records TLV type
+		// range.
+		if k < MinCustomRecordsTlvType {
+			continue
+		}
+
+		// Include the record in the custom records map.
+		customRecordsTlvMap[k] = v
+
+		// Now that the record is included in the custom records map,
+		// we can remove it from the extra data TLV map.
+		delete(extraDataTlvMap, k)
+	}
+
+	// Set the custom records field to the TLV record map.
+	customRecords, err := NewCustomRecordsFromTlvTypeMap(
+		customRecordsTlvMap,
 	)
+	if err != nil {
+		return err
+	}
+	c.CustomRecords = customRecords
+
+	// Set custom records to nil if we didn't parse anything out of it so
+	// that we can use assert.Equal in tests.
+	if len(customRecordsTlvMap) == 0 {
+		c.CustomRecords = nil
+	}
+
+	// Set extra data to nil if we didn't parse anything out of it so that
+	// we can use assert.Equal in tests.
+	if len(extraDataTlvMap) == 0 {
+		c.ExtraData = nil
+		return nil
+	}
+
+	// Encode the remaining records back into the extra data field. These
+	// records are not in the custom records TLV type range and do not
+	// have associated fields in the UpdateFulfillHTLC struct.
+	c.ExtraData, err = NewExtraOpaqueDataFromTlvTypeMap(extraDataTlvMap)
+	if err != nil {
+		return err
+	}
+
+	return nil
 }
 
 // Encode serializes the target UpdateFulfillHTLC into the passed io.Writer
@@ -74,7 +144,34 @@ func (c *UpdateFulfillHTLC) Encode(w *bytes.Buffer, pver uint32) error {
 		return err
 	}
 
-	return WriteBytes(w, c.ExtraData)
+	// Construct a slice of all the records that we should include in the
+	// message extra data field. We will start by including any records from
+	// the extra data field.
+	msgExtraDataRecords, err := c.ExtraData.RecordProducers()
+	if err != nil {
+		return err
+	}
+
+	// Include custom records in the extra data wire field if they are
+	// present. Ensure that the custom records are validated before encoding
+	// them.
+	if err := c.CustomRecords.Validate(); err != nil {
+		return fmt.Errorf("custom records validation error: %w", err)
+	}
+
+	// Extend the message extra data records slice with TLV records from the
+	// custom records field.
+	customTlvRecords := c.CustomRecords.RecordProducers()
+	msgExtraDataRecords = append(msgExtraDataRecords, customTlvRecords...)
+
+	// We will now construct the message extra data field that will be
+	// encoded into the byte writer.
+	var msgExtraData ExtraOpaqueData
+	if err := msgExtraData.PackRecords(msgExtraDataRecords...); err != nil {
+		return err
+	}
+
+	return WriteBytes(w, msgExtraData)
 }
 
 // MsgType returns the integer uniquely identifying this message type on the
diff --git a/peer/brontide.go b/peer/brontide.go
index e084bb88a5..ef74a6110c 100644
--- a/peer/brontide.go
+++ b/peer/brontide.go
@@ -2033,8 +2033,9 @@ func messageSummary(msg lnwire.Message) string {
 			msg.ID, msg.Reason)
 
 	case *lnwire.UpdateFulfillHTLC:
-		return fmt.Sprintf("chan_id=%v, id=%v, pre_image=%x",
-			msg.ChanID, msg.ID, msg.PaymentPreimage[:])
+		return fmt.Sprintf("chan_id=%v, id=%v, pre_image=%x, "+
+			"custom_records=%v", msg.ChanID, msg.ID,
+			msg.PaymentPreimage[:], msg.CustomRecords)
 
 	case *lnwire.CommitSig:
 		return fmt.Sprintf("chan_id=%v, num_htlcs=%v", msg.ChanID,

From 5c3f7bec0fe8b07781a5934380487a1da306977b Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Fri, 3 May 2024 19:01:47 +0100
Subject: [PATCH 10/15] lnwire: add encoding/decoding unit tests for
 `UpdateFulfillHTLC` message

---
 lnwire/update_fulfill_htlc_test.go | 148 +++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 lnwire/update_fulfill_htlc_test.go

diff --git a/lnwire/update_fulfill_htlc_test.go b/lnwire/update_fulfill_htlc_test.go
new file mode 100644
index 0000000000..705798df4e
--- /dev/null
+++ b/lnwire/update_fulfill_htlc_test.go
@@ -0,0 +1,148 @@
+package lnwire
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/lightningnetwork/lnd/tlv"
+	"github.com/stretchr/testify/require"
+)
+
+// testCaseUpdateFulfill is a test case for the UpdateFulfillHTLC message.
+type testCaseUpdateFulfill struct {
+	// Msg is the message to be encoded and decoded.
+	Msg UpdateFulfillHTLC
+
+	// ExpectEncodeError is a flag that indicates whether we expect the
+	// encoding of the message to fail.
+	ExpectEncodeError bool
+}
+
+// generateTestCases generates a set of UpdateFulfillHTLC message test cases.
+func generateUpdateFulfillTestCases(t *testing.T) []testCaseUpdateFulfill {
+	// Firstly, we'll set basic values for the message fields.
+	//
+	// Generate random channel ID.
+	chanIDBytes, err := generateRandomBytes(32)
+	require.NoError(t, err)
+
+	var chanID ChannelID
+	copy(chanID[:], chanIDBytes)
+
+	// Generate random payment preimage.
+	paymentPreimageBytes, err := generateRandomBytes(32)
+	require.NoError(t, err)
+
+	var paymentPreimage [32]byte
+	copy(paymentPreimage[:], paymentPreimageBytes)
+
+	// Define custom records.
+	recordKey1 := uint64(MinCustomRecordsTlvType + 1)
+	recordValue1, err := generateRandomBytes(10)
+	require.NoError(t, err)
+
+	recordKey2 := uint64(MinCustomRecordsTlvType + 2)
+	recordValue2, err := generateRandomBytes(10)
+	require.NoError(t, err)
+
+	customRecords := CustomRecords{
+		recordKey1: recordValue1,
+		recordKey2: recordValue2,
+	}
+
+	// Construct an instance of extra data that contains records with TLV
+	// types below the minimum custom records threshold and that lack
+	// corresponding fields in the message struct. Content should persist in
+	// the extra data field after encoding and decoding.
+	var (
+		recordBytes45 = []byte("recordBytes45")
+		tlvRecord45   = tlv.NewPrimitiveRecord[tlv.TlvType45](
+			recordBytes45,
+		)
+
+		recordBytes55 = []byte("recordBytes55")
+		tlvRecord55   = tlv.NewPrimitiveRecord[tlv.TlvType55](
+			recordBytes55,
+		)
+	)
+
+	var extraData ExtraOpaqueData
+	err = extraData.PackRecords(
+		[]tlv.RecordProducer{&tlvRecord45, &tlvRecord55}...,
+	)
+	require.NoError(t, err)
+
+	// Define test cases.
+	testCases := make([]testCaseUpdateFulfill, 0)
+
+	testCases = append(testCases, testCaseUpdateFulfill{
+		Msg: UpdateFulfillHTLC{
+			ChanID:          chanID,
+			ID:              42,
+			PaymentPreimage: paymentPreimage,
+			CustomRecords:   customRecords,
+			ExtraData:       extraData,
+		},
+	})
+
+	return testCases
+}
+
+// TestUpdateFulfillHtlcEncodeDecode tests UpdateFulfillHTLC message encoding
+// and decoding for all supported field values.
+func TestUpdateFulfillHtlcEncodeDecode(t *testing.T) {
+	t.Parallel()
+
+	// Generate test cases.
+	testCases := generateUpdateFulfillTestCases(t)
+
+	// Execute test cases.
+	for tcIdx, tc := range testCases {
+		t.Log("Running test case", tcIdx)
+
+		// Encode test case message.
+		var buf bytes.Buffer
+		err := tc.Msg.Encode(&buf, 0)
+
+		// Check if we expect an encoding error.
+		if tc.ExpectEncodeError {
+			require.Error(t, err)
+			continue
+		}
+		require.NoError(t, err)
+
+		// Decode the encoded message bytes message.
+		var actualMsg UpdateFulfillHTLC
+		decodeReader := bytes.NewReader(buf.Bytes())
+		err = actualMsg.Decode(decodeReader, 0)
+		require.NoError(t, err)
+
+		// Compare the two messages to ensure equality one field at a
+		// time.
+		require.Equal(t, tc.Msg.ChanID, actualMsg.ChanID)
+		require.Equal(t, tc.Msg.ID, actualMsg.ID)
+		require.Equal(
+			t, tc.Msg.PaymentPreimage, actualMsg.PaymentPreimage,
+		)
+
+		// Check that the custom records field is as expected.
+		if len(tc.Msg.CustomRecords) == 0 {
+			require.Len(t, actualMsg.CustomRecords, 0)
+		} else {
+			require.Equal(
+				t, tc.Msg.CustomRecords,
+				actualMsg.CustomRecords,
+			)
+		}
+
+		// Check that the extra data field is as expected.
+		if len(tc.Msg.ExtraData) == 0 {
+			require.Len(t, actualMsg.ExtraData, 0)
+		} else {
+			require.Equal(
+				t, tc.Msg.ExtraData,
+				actualMsg.ExtraData,
+			)
+		}
+	}
+}

From 406fbe243e272377760ed70cc628050d531fd794 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Tue, 14 May 2024 13:01:07 +0100
Subject: [PATCH 11/15] lnwire: specify random fields for UpdateFulfillHTLC
 message in fuzz test

This commit defines random fields for the `UpdateFulfillHTLC` message
as part of the encode/decode unit tests.
---
 lnwire/lnwire_test.go | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lnwire/lnwire_test.go b/lnwire/lnwire_test.go
index b073103984..c9413d4c2f 100644
--- a/lnwire/lnwire_test.go
+++ b/lnwire/lnwire_test.go
@@ -1414,6 +1414,21 @@ func TestLightningWireProtocol(t *testing.T) {
 
 			v[0] = reflect.ValueOf(*req)
 		},
+		MsgUpdateFulfillHTLC: func(v []reflect.Value, r *rand.Rand) {
+			req := UpdateFulfillHTLC{
+				ID: r.Uint64(),
+			}
+
+			_, err := r.Read(req.ChanID[:])
+			require.NoError(t, err)
+
+			_, err = r.Read(req.PaymentPreimage[:])
+			require.NoError(t, err)
+
+			req.CustomRecords = randCustomRecords(t, r)
+
+			v[0] = reflect.ValueOf(req)
+		},
 	}
 
 	// With the above types defined, we'll now generate a slice of

From 31ee27435a6bad747065f7a655712096582c3435 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Sat, 13 Apr 2024 12:29:52 +0100
Subject: [PATCH 12/15] htlcswitch: add resume modified HTLC action to switch

Introduce `ResumeModified` action to resume standard behavior of a p2p
message with optional modifications as specified by the client during
interception.
---
 htlcswitch/interceptable_switch.go | 80 ++++++++++++++++++++++++++++++
 htlcswitch/interfaces.go           |  6 +++
 intercepted_forward.go             | 10 ++++
 3 files changed, 96 insertions(+)

diff --git a/htlcswitch/interceptable_switch.go b/htlcswitch/interceptable_switch.go
index 2f180e257f..52a57b095d 100644
--- a/htlcswitch/interceptable_switch.go
+++ b/htlcswitch/interceptable_switch.go
@@ -8,9 +8,11 @@ import (
 	"github.com/go-errors/errors"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/channeldb/models"
+	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/htlcswitch/hop"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/record"
 )
 
 var (
@@ -105,6 +107,10 @@ const (
 
 	// FwdActionFail fails the intercepted packet back to the sender.
 	FwdActionFail
+
+	// FwdActionResumeModified forwards the intercepted packet to the switch
+	// with modifications.
+	FwdActionResumeModified
 )
 
 // FwdResolution defines the action to be taken on an intercepted packet.
@@ -119,6 +125,14 @@ type FwdResolution struct {
 	// FwdActionSettle.
 	Preimage lntypes.Preimage
 
+	// OutgoingAmountMsat is the amount that is to be used for forwarding if
+	// Action is FwdActionResumeModified.
+	OutgoingAmountMsat fn.Option[lnwire.MilliSatoshi]
+
+	// CustomRecords is the custom records that are to be used for
+	// forwarding if Action is FwdActionResumeModified.
+	CustomRecords fn.Option[record.CustomSet]
+
 	// FailureMessage is the encrypted failure message that is to be passed
 	// back to the sender if action is FwdActionFail.
 	FailureMessage []byte
@@ -375,6 +389,11 @@ func (s *InterceptableSwitch) resolve(res *FwdResolution) error {
 	case FwdActionResume:
 		return intercepted.Resume()
 
+	case FwdActionResumeModified:
+		return intercepted.ResumeModified(
+			res.OutgoingAmountMsat, res.CustomRecords,
+		)
+
 	case FwdActionSettle:
 		return intercepted.Settle(res.Preimage)
 
@@ -617,6 +636,67 @@ func (f *interceptedForward) Resume() error {
 	return f.htlcSwitch.ForwardPackets(nil, f.packet)
 }
 
+// ResumeModified resumes the default behavior with field modifications.
+func (f *interceptedForward) ResumeModified(
+	outgoingAmountMsat fn.Option[lnwire.MilliSatoshi],
+	customRecords fn.Option[record.CustomSet]) error {
+
+	// Modify the wire message contained in the packet.
+	switch htlc := f.packet.htlc.(type) {
+	case *lnwire.UpdateAddHTLC:
+		outgoingAmountMsat.WhenSome(func(amount lnwire.MilliSatoshi) {
+			htlc.Amount = amount
+		})
+
+		//nolint:lll
+		err := fn.MapOptionZ(customRecords, func(records record.CustomSet) error {
+			if len(records) == 0 {
+				return nil
+			}
+
+			// Type cast and validate custom records.
+			htlc.CustomRecords = lnwire.CustomRecords(records)
+			err := htlc.CustomRecords.Validate()
+			if err != nil {
+				return fmt.Errorf("failed to validate custom "+
+					"records: %w", err)
+			}
+
+			return nil
+		})
+		if err != nil {
+			return fmt.Errorf("failed to encode custom records: %w",
+				err)
+		}
+
+	case *lnwire.UpdateFulfillHTLC:
+		//nolint:lll
+		err := fn.MapOptionZ(customRecords, func(records record.CustomSet) error {
+			if len(records) == 0 {
+				return nil
+			}
+
+			// Type cast and validate custom records.
+			htlc.CustomRecords = lnwire.CustomRecords(records)
+			err := htlc.CustomRecords.Validate()
+			if err != nil {
+				return fmt.Errorf("failed to validate custom "+
+					"records: %w", err)
+			}
+
+			return nil
+		})
+		if err != nil {
+			return fmt.Errorf("failed to encode custom records: %w",
+				err)
+		}
+	}
+
+	// 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)
+}
+
 // Fail notifies the intention to Fail an existing hold forward with an
 // encrypted failure reason.
 func (f *interceptedForward) Fail(reason []byte) error {
diff --git a/htlcswitch/interfaces.go b/htlcswitch/interfaces.go
index bad2c353d1..a8d77d6e64 100644
--- a/htlcswitch/interfaces.go
+++ b/htlcswitch/interfaces.go
@@ -6,6 +6,7 @@ import (
 	"github.com/btcsuite/btcd/wire"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/channeldb/models"
+	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/invoices"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
@@ -375,6 +376,11 @@ type InterceptedForward interface {
 	// this htlc which usually means forward it.
 	Resume() error
 
+	// ResumeModified notifies the intention to resume an existing hold
+	// forward with modified fields.
+	ResumeModified(outgoingAmountMsat fn.Option[lnwire.MilliSatoshi],
+		customRecords fn.Option[record.CustomSet]) error
+
 	// Settle notifies the intention to settle an existing hold
 	// forward with a given preimage.
 	Settle(lntypes.Preimage) error
diff --git a/intercepted_forward.go b/intercepted_forward.go
index 70590d0e41..044abd3fed 100644
--- a/intercepted_forward.go
+++ b/intercepted_forward.go
@@ -3,9 +3,11 @@ package lnd
 import (
 	"errors"
 
+	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/htlcswitch"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/record"
 )
 
 var (
@@ -51,6 +53,14 @@ func (f *interceptedForward) Resume() error {
 	return ErrCannotResume
 }
 
+// ResumeModified notifies the intention to resume an existing hold forward with
+// a modified htlc.
+func (f *interceptedForward) ResumeModified(_ fn.Option[lnwire.MilliSatoshi],
+	_ fn.Option[record.CustomSet]) error {
+
+	return ErrCannotResume
+}
+
 // Fail notifies the intention to fail an existing hold forward with an
 // encrypted failure reason.
 func (f *interceptedForward) Fail(_ []byte) error {

From bd5de434ab372d8aa51228dc1cbe7d2ac00a9927 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Sat, 13 Apr 2024 11:42:20 +0100
Subject: [PATCH 13/15] routerrpc: extend HTLC forward interceptor resp with
 modification fields

This commit extends the forward HTLC intercept response with fields that
can be used in conjunction with a `ResumeModified` action to modify the
intercepted HTLC p2p message.
---
 lnrpc/routerrpc/forward_interceptor.go |  33 ++
 lnrpc/routerrpc/router.pb.go           | 498 ++++++++++++++-----------
 lnrpc/routerrpc/router.proto           |  14 +
 lnrpc/routerrpc/router.swagger.json    |  21 +-
 4 files changed, 336 insertions(+), 230 deletions(-)

diff --git a/lnrpc/routerrpc/forward_interceptor.go b/lnrpc/routerrpc/forward_interceptor.go
index 55c77d6d9b..a2b82df858 100644
--- a/lnrpc/routerrpc/forward_interceptor.go
+++ b/lnrpc/routerrpc/forward_interceptor.go
@@ -4,10 +4,12 @@ import (
 	"errors"
 
 	"github.com/lightningnetwork/lnd/channeldb/models"
+	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/htlcswitch"
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/record"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
@@ -119,6 +121,37 @@ func (r *forwardInterceptor) resolveFromClient(
 			Action: htlcswitch.FwdActionResume,
 		})
 
+	case ResolveHoldForwardAction_RESUME_MODIFIED:
+		// Modify HTLC and resume forward.
+		outgoingAmtMsat := fn.None[lnwire.MilliSatoshi]()
+		if in.OutgoingAmountMsat > 0 {
+			outgoingAmtMsat = fn.Some[lnwire.MilliSatoshi](
+				lnwire.MilliSatoshi(in.OutgoingAmountMsat),
+			)
+		}
+
+		customRecords := fn.None[record.CustomSet]()
+		if len(in.CustomRecords) > 0 {
+			// Validate custom records.
+			cr := record.CustomSet(in.CustomRecords)
+			if err := cr.Validate(); err != nil {
+				return status.Errorf(
+					codes.InvalidArgument,
+					"failed to validate custom records: %v",
+					err,
+				)
+			}
+
+			customRecords = fn.Some[record.CustomSet](cr)
+		}
+
+		return r.htlcSwitch.Resolve(&htlcswitch.FwdResolution{
+			Key:                circuitKey,
+			Action:             htlcswitch.FwdActionResumeModified,
+			OutgoingAmountMsat: outgoingAmtMsat,
+			CustomRecords:      customRecords,
+		})
+
 	case ResolveHoldForwardAction_FAIL:
 		// Fail with an encrypted reason.
 		if in.FailureMessage != nil {
diff --git a/lnrpc/routerrpc/router.pb.go b/lnrpc/routerrpc/router.pb.go
index aec86404eb..f3c6310ebc 100644
--- a/lnrpc/routerrpc/router.pb.go
+++ b/lnrpc/routerrpc/router.pb.go
@@ -206,6 +206,9 @@ const (
 	ResolveHoldForwardAction_SETTLE ResolveHoldForwardAction = 0
 	ResolveHoldForwardAction_FAIL   ResolveHoldForwardAction = 1
 	ResolveHoldForwardAction_RESUME ResolveHoldForwardAction = 2
+	// RESUME_MODIFIED is an action that is used to resume a hold forward HTLC
+	// with modifications specified during interception.
+	ResolveHoldForwardAction_RESUME_MODIFIED ResolveHoldForwardAction = 3
 )
 
 // Enum value maps for ResolveHoldForwardAction.
@@ -214,11 +217,13 @@ var (
 		0: "SETTLE",
 		1: "FAIL",
 		2: "RESUME",
+		3: "RESUME_MODIFIED",
 	}
 	ResolveHoldForwardAction_value = map[string]int32{
-		"SETTLE": 0,
-		"FAIL":   1,
-		"RESUME": 2,
+		"SETTLE":          0,
+		"FAIL":            1,
+		"RESUME":          2,
+		"RESUME_MODIFIED": 3,
 	}
 )
 
@@ -3143,6 +3148,8 @@ func (x *ForwardHtlcInterceptRequest) GetAutoFailHeight() int32 {
 // ForwardHtlcInterceptResponse enables the caller to resolve a previously hold
 // forward. The caller can choose either to:
 // - `Resume`: Execute the default behavior (usually forward).
+// - `ResumeModified`: Execute the default behavior (usually forward) with HTLC
+// field modifications.
 // - `Reject`: Fail the htlc backwards.
 // - `Settle`: Settle this htlc with a given preimage.
 type ForwardHtlcInterceptResponse struct {
@@ -3171,6 +3178,12 @@ type ForwardHtlcInterceptResponse struct {
 	// For backwards-compatibility reasons, TEMPORARY_CHANNEL_FAILURE is the
 	// default value for this field.
 	FailureCode lnrpc.Failure_FailureCode `protobuf:"varint,5,opt,name=failure_code,json=failureCode,proto3,enum=lnrpc.Failure_FailureCode" json:"failure_code,omitempty"`
+	// outgoing_amount_msat is used to set the p2p message outgoing amount field
+	// for resuming a HTLC.
+	OutgoingAmountMsat uint64 `protobuf:"varint,6,opt,name=outgoing_amount_msat,json=outgoingAmountMsat,proto3" json:"outgoing_amount_msat,omitempty"`
+	// custom_records is used to set the p2p message custom records field for
+	// resuming a HTLC.
+	CustomRecords map[uint64][]byte `protobuf:"bytes,7,rep,name=custom_records,json=customRecords,proto3" json:"custom_records,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *ForwardHtlcInterceptResponse) Reset() {
@@ -3240,6 +3253,20 @@ func (x *ForwardHtlcInterceptResponse) GetFailureCode() lnrpc.Failure_FailureCod
 	return lnrpc.Failure_FailureCode(0)
 }
 
+func (x *ForwardHtlcInterceptResponse) GetOutgoingAmountMsat() uint64 {
+	if x != nil {
+		return x.OutgoingAmountMsat
+	}
+	return 0
+}
+
+func (x *ForwardHtlcInterceptResponse) GetCustomRecords() map[uint64][]byte {
+	if x != nil {
+		return x.CustomRecords
+	}
+	return nil
+}
+
 type UpdateChanStatusRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -3727,7 +3754,7 @@ var file_routerrpc_router_proto_rawDesc = []byte{
 	0x6f, 0x72, 0x64, 0x73, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79,
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+	0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0xff, 0x03, 0x0a, 0x1c, 0x46, 0x6f, 0x72, 0x77, 0x61, 0x72,
 	0x64, 0x48, 0x74, 0x6c, 0x63, 0x49, 0x6e, 0x74, 0x65, 0x72, 0x63, 0x65, 0x70, 0x74, 0x52, 0x65,
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@@ -3746,170 +3773,185 @@ var file_routerrpc_router_proto_rawDesc = []byte{
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 }
 
 var (
@@ -3925,7 +3967,7 @@ func file_routerrpc_router_proto_rawDescGZIP() []byte {
 }
 
 var file_routerrpc_router_proto_enumTypes = make([]protoimpl.EnumInfo, 6)
-var file_routerrpc_router_proto_msgTypes = make([]protoimpl.MessageInfo, 43)
+var file_routerrpc_router_proto_msgTypes = make([]protoimpl.MessageInfo, 44)
 var file_routerrpc_router_proto_goTypes = []interface{}{
 	(FailureDetail)(0),                         // 0: routerrpc.FailureDetail
 	(PaymentState)(0),                          // 1: routerrpc.PaymentState
@@ -3976,23 +4018,24 @@ var file_routerrpc_router_proto_goTypes = []interface{}{
 	(*UpdateChanStatusResponse)(nil),           // 46: routerrpc.UpdateChanStatusResponse
 	nil,                                        // 47: routerrpc.SendPaymentRequest.DestCustomRecordsEntry
 	nil,                                        // 48: routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry
-	(*lnrpc.RouteHint)(nil),                    // 49: lnrpc.RouteHint
-	(lnrpc.FeatureBit)(0),                      // 50: lnrpc.FeatureBit
-	(lnrpc.PaymentFailureReason)(0),            // 51: lnrpc.PaymentFailureReason
-	(*lnrpc.Route)(nil),                        // 52: lnrpc.Route
-	(*lnrpc.Failure)(nil),                      // 53: lnrpc.Failure
-	(lnrpc.Failure_FailureCode)(0),             // 54: lnrpc.Failure.FailureCode
-	(*lnrpc.HTLCAttempt)(nil),                  // 55: lnrpc.HTLCAttempt
-	(*lnrpc.ChannelPoint)(nil),                 // 56: lnrpc.ChannelPoint
-	(*lnrpc.Payment)(nil),                      // 57: lnrpc.Payment
+	nil,                                        // 49: routerrpc.ForwardHtlcInterceptResponse.CustomRecordsEntry
+	(*lnrpc.RouteHint)(nil),                    // 50: lnrpc.RouteHint
+	(lnrpc.FeatureBit)(0),                      // 51: lnrpc.FeatureBit
+	(lnrpc.PaymentFailureReason)(0),            // 52: lnrpc.PaymentFailureReason
+	(*lnrpc.Route)(nil),                        // 53: lnrpc.Route
+	(*lnrpc.Failure)(nil),                      // 54: lnrpc.Failure
+	(lnrpc.Failure_FailureCode)(0),             // 55: lnrpc.Failure.FailureCode
+	(*lnrpc.HTLCAttempt)(nil),                  // 56: lnrpc.HTLCAttempt
+	(*lnrpc.ChannelPoint)(nil),                 // 57: lnrpc.ChannelPoint
+	(*lnrpc.Payment)(nil),                      // 58: lnrpc.Payment
 }
 var file_routerrpc_router_proto_depIdxs = []int32{
-	49, // 0: routerrpc.SendPaymentRequest.route_hints:type_name -> lnrpc.RouteHint
+	50, // 0: routerrpc.SendPaymentRequest.route_hints:type_name -> lnrpc.RouteHint
 	47, // 1: routerrpc.SendPaymentRequest.dest_custom_records:type_name -> routerrpc.SendPaymentRequest.DestCustomRecordsEntry
-	50, // 2: routerrpc.SendPaymentRequest.dest_features:type_name -> lnrpc.FeatureBit
-	51, // 3: routerrpc.RouteFeeResponse.failure_reason:type_name -> lnrpc.PaymentFailureReason
-	52, // 4: routerrpc.SendToRouteRequest.route:type_name -> lnrpc.Route
-	53, // 5: routerrpc.SendToRouteResponse.failure:type_name -> lnrpc.Failure
+	51, // 2: routerrpc.SendPaymentRequest.dest_features:type_name -> lnrpc.FeatureBit
+	52, // 3: routerrpc.RouteFeeResponse.failure_reason:type_name -> lnrpc.PaymentFailureReason
+	53, // 4: routerrpc.SendToRouteRequest.route:type_name -> lnrpc.Route
+	54, // 5: routerrpc.SendToRouteResponse.failure:type_name -> lnrpc.Failure
 	19, // 6: routerrpc.QueryMissionControlResponse.pairs:type_name -> routerrpc.PairHistory
 	19, // 7: routerrpc.XImportMissionControlRequest.pairs:type_name -> routerrpc.PairHistory
 	20, // 8: routerrpc.PairHistory.history:type_name -> routerrpc.PairData
@@ -4002,7 +4045,7 @@ var file_routerrpc_router_proto_depIdxs = []int32{
 	27, // 12: routerrpc.MissionControlConfig.apriori:type_name -> routerrpc.AprioriParameters
 	26, // 13: routerrpc.MissionControlConfig.bimodal:type_name -> routerrpc.BimodalParameters
 	20, // 14: routerrpc.QueryProbabilityResponse.history:type_name -> routerrpc.PairData
-	52, // 15: routerrpc.BuildRouteResponse.route:type_name -> lnrpc.Route
+	53, // 15: routerrpc.BuildRouteResponse.route:type_name -> lnrpc.Route
 	5,  // 16: routerrpc.HtlcEvent.event_type:type_name -> routerrpc.HtlcEvent.EventType
 	35, // 17: routerrpc.HtlcEvent.forward_event:type_name -> routerrpc.ForwardEvent
 	36, // 18: routerrpc.HtlcEvent.forward_fail_event:type_name -> routerrpc.ForwardFailEvent
@@ -4012,58 +4055,59 @@ var file_routerrpc_router_proto_depIdxs = []int32{
 	38, // 22: routerrpc.HtlcEvent.final_htlc_event:type_name -> routerrpc.FinalHtlcEvent
 	34, // 23: routerrpc.ForwardEvent.info:type_name -> routerrpc.HtlcInfo
 	34, // 24: routerrpc.LinkFailEvent.info:type_name -> routerrpc.HtlcInfo
-	54, // 25: routerrpc.LinkFailEvent.wire_failure:type_name -> lnrpc.Failure.FailureCode
+	55, // 25: routerrpc.LinkFailEvent.wire_failure:type_name -> lnrpc.Failure.FailureCode
 	0,  // 26: routerrpc.LinkFailEvent.failure_detail:type_name -> routerrpc.FailureDetail
 	1,  // 27: routerrpc.PaymentStatus.state:type_name -> routerrpc.PaymentState
-	55, // 28: routerrpc.PaymentStatus.htlcs:type_name -> lnrpc.HTLCAttempt
+	56, // 28: routerrpc.PaymentStatus.htlcs:type_name -> lnrpc.HTLCAttempt
 	42, // 29: routerrpc.ForwardHtlcInterceptRequest.incoming_circuit_key:type_name -> routerrpc.CircuitKey
 	48, // 30: routerrpc.ForwardHtlcInterceptRequest.custom_records:type_name -> routerrpc.ForwardHtlcInterceptRequest.CustomRecordsEntry
 	42, // 31: routerrpc.ForwardHtlcInterceptResponse.incoming_circuit_key:type_name -> routerrpc.CircuitKey
 	2,  // 32: routerrpc.ForwardHtlcInterceptResponse.action:type_name -> routerrpc.ResolveHoldForwardAction
-	54, // 33: routerrpc.ForwardHtlcInterceptResponse.failure_code:type_name -> lnrpc.Failure.FailureCode
-	56, // 34: routerrpc.UpdateChanStatusRequest.chan_point:type_name -> lnrpc.ChannelPoint
-	3,  // 35: routerrpc.UpdateChanStatusRequest.action:type_name -> routerrpc.ChanStatusAction
-	6,  // 36: routerrpc.Router.SendPaymentV2:input_type -> routerrpc.SendPaymentRequest
-	7,  // 37: routerrpc.Router.TrackPaymentV2:input_type -> routerrpc.TrackPaymentRequest
-	8,  // 38: routerrpc.Router.TrackPayments:input_type -> routerrpc.TrackPaymentsRequest
-	9,  // 39: routerrpc.Router.EstimateRouteFee:input_type -> routerrpc.RouteFeeRequest
-	11, // 40: routerrpc.Router.SendToRoute:input_type -> routerrpc.SendToRouteRequest
-	11, // 41: routerrpc.Router.SendToRouteV2:input_type -> routerrpc.SendToRouteRequest
-	13, // 42: routerrpc.Router.ResetMissionControl:input_type -> routerrpc.ResetMissionControlRequest
-	15, // 43: routerrpc.Router.QueryMissionControl:input_type -> routerrpc.QueryMissionControlRequest
-	17, // 44: routerrpc.Router.XImportMissionControl:input_type -> routerrpc.XImportMissionControlRequest
-	21, // 45: routerrpc.Router.GetMissionControlConfig:input_type -> routerrpc.GetMissionControlConfigRequest
-	23, // 46: routerrpc.Router.SetMissionControlConfig:input_type -> routerrpc.SetMissionControlConfigRequest
-	28, // 47: routerrpc.Router.QueryProbability:input_type -> routerrpc.QueryProbabilityRequest
-	30, // 48: routerrpc.Router.BuildRoute:input_type -> routerrpc.BuildRouteRequest
-	32, // 49: routerrpc.Router.SubscribeHtlcEvents:input_type -> routerrpc.SubscribeHtlcEventsRequest
-	6,  // 50: routerrpc.Router.SendPayment:input_type -> routerrpc.SendPaymentRequest
-	7,  // 51: routerrpc.Router.TrackPayment:input_type -> routerrpc.TrackPaymentRequest
-	44, // 52: routerrpc.Router.HtlcInterceptor:input_type -> routerrpc.ForwardHtlcInterceptResponse
-	45, // 53: routerrpc.Router.UpdateChanStatus:input_type -> routerrpc.UpdateChanStatusRequest
-	57, // 54: routerrpc.Router.SendPaymentV2:output_type -> lnrpc.Payment
-	57, // 55: routerrpc.Router.TrackPaymentV2:output_type -> lnrpc.Payment
-	57, // 56: routerrpc.Router.TrackPayments:output_type -> lnrpc.Payment
-	10, // 57: routerrpc.Router.EstimateRouteFee:output_type -> routerrpc.RouteFeeResponse
-	12, // 58: routerrpc.Router.SendToRoute:output_type -> routerrpc.SendToRouteResponse
-	55, // 59: routerrpc.Router.SendToRouteV2:output_type -> lnrpc.HTLCAttempt
-	14, // 60: routerrpc.Router.ResetMissionControl:output_type -> routerrpc.ResetMissionControlResponse
-	16, // 61: routerrpc.Router.QueryMissionControl:output_type -> routerrpc.QueryMissionControlResponse
-	18, // 62: routerrpc.Router.XImportMissionControl:output_type -> routerrpc.XImportMissionControlResponse
-	22, // 63: routerrpc.Router.GetMissionControlConfig:output_type -> routerrpc.GetMissionControlConfigResponse
-	24, // 64: routerrpc.Router.SetMissionControlConfig:output_type -> routerrpc.SetMissionControlConfigResponse
-	29, // 65: routerrpc.Router.QueryProbability:output_type -> routerrpc.QueryProbabilityResponse
-	31, // 66: routerrpc.Router.BuildRoute:output_type -> routerrpc.BuildRouteResponse
-	33, // 67: routerrpc.Router.SubscribeHtlcEvents:output_type -> routerrpc.HtlcEvent
-	41, // 68: routerrpc.Router.SendPayment:output_type -> routerrpc.PaymentStatus
-	41, // 69: routerrpc.Router.TrackPayment:output_type -> routerrpc.PaymentStatus
-	43, // 70: routerrpc.Router.HtlcInterceptor:output_type -> routerrpc.ForwardHtlcInterceptRequest
-	46, // 71: routerrpc.Router.UpdateChanStatus:output_type -> routerrpc.UpdateChanStatusResponse
-	54, // [54:72] is the sub-list for method output_type
-	36, // [36:54] is the sub-list for method input_type
-	36, // [36:36] is the sub-list for extension type_name
-	36, // [36:36] is the sub-list for extension extendee
-	0,  // [0:36] is the sub-list for field type_name
+	55, // 33: routerrpc.ForwardHtlcInterceptResponse.failure_code:type_name -> lnrpc.Failure.FailureCode
+	49, // 34: routerrpc.ForwardHtlcInterceptResponse.custom_records:type_name -> routerrpc.ForwardHtlcInterceptResponse.CustomRecordsEntry
+	57, // 35: routerrpc.UpdateChanStatusRequest.chan_point:type_name -> lnrpc.ChannelPoint
+	3,  // 36: routerrpc.UpdateChanStatusRequest.action:type_name -> routerrpc.ChanStatusAction
+	6,  // 37: routerrpc.Router.SendPaymentV2:input_type -> routerrpc.SendPaymentRequest
+	7,  // 38: routerrpc.Router.TrackPaymentV2:input_type -> routerrpc.TrackPaymentRequest
+	8,  // 39: routerrpc.Router.TrackPayments:input_type -> routerrpc.TrackPaymentsRequest
+	9,  // 40: routerrpc.Router.EstimateRouteFee:input_type -> routerrpc.RouteFeeRequest
+	11, // 41: routerrpc.Router.SendToRoute:input_type -> routerrpc.SendToRouteRequest
+	11, // 42: routerrpc.Router.SendToRouteV2:input_type -> routerrpc.SendToRouteRequest
+	13, // 43: routerrpc.Router.ResetMissionControl:input_type -> routerrpc.ResetMissionControlRequest
+	15, // 44: routerrpc.Router.QueryMissionControl:input_type -> routerrpc.QueryMissionControlRequest
+	17, // 45: routerrpc.Router.XImportMissionControl:input_type -> routerrpc.XImportMissionControlRequest
+	21, // 46: routerrpc.Router.GetMissionControlConfig:input_type -> routerrpc.GetMissionControlConfigRequest
+	23, // 47: routerrpc.Router.SetMissionControlConfig:input_type -> routerrpc.SetMissionControlConfigRequest
+	28, // 48: routerrpc.Router.QueryProbability:input_type -> routerrpc.QueryProbabilityRequest
+	30, // 49: routerrpc.Router.BuildRoute:input_type -> routerrpc.BuildRouteRequest
+	32, // 50: routerrpc.Router.SubscribeHtlcEvents:input_type -> routerrpc.SubscribeHtlcEventsRequest
+	6,  // 51: routerrpc.Router.SendPayment:input_type -> routerrpc.SendPaymentRequest
+	7,  // 52: routerrpc.Router.TrackPayment:input_type -> routerrpc.TrackPaymentRequest
+	44, // 53: routerrpc.Router.HtlcInterceptor:input_type -> routerrpc.ForwardHtlcInterceptResponse
+	45, // 54: routerrpc.Router.UpdateChanStatus:input_type -> routerrpc.UpdateChanStatusRequest
+	58, // 55: routerrpc.Router.SendPaymentV2:output_type -> lnrpc.Payment
+	58, // 56: routerrpc.Router.TrackPaymentV2:output_type -> lnrpc.Payment
+	58, // 57: routerrpc.Router.TrackPayments:output_type -> lnrpc.Payment
+	10, // 58: routerrpc.Router.EstimateRouteFee:output_type -> routerrpc.RouteFeeResponse
+	12, // 59: routerrpc.Router.SendToRoute:output_type -> routerrpc.SendToRouteResponse
+	56, // 60: routerrpc.Router.SendToRouteV2:output_type -> lnrpc.HTLCAttempt
+	14, // 61: routerrpc.Router.ResetMissionControl:output_type -> routerrpc.ResetMissionControlResponse
+	16, // 62: routerrpc.Router.QueryMissionControl:output_type -> routerrpc.QueryMissionControlResponse
+	18, // 63: routerrpc.Router.XImportMissionControl:output_type -> routerrpc.XImportMissionControlResponse
+	22, // 64: routerrpc.Router.GetMissionControlConfig:output_type -> routerrpc.GetMissionControlConfigResponse
+	24, // 65: routerrpc.Router.SetMissionControlConfig:output_type -> routerrpc.SetMissionControlConfigResponse
+	29, // 66: routerrpc.Router.QueryProbability:output_type -> routerrpc.QueryProbabilityResponse
+	31, // 67: routerrpc.Router.BuildRoute:output_type -> routerrpc.BuildRouteResponse
+	33, // 68: routerrpc.Router.SubscribeHtlcEvents:output_type -> routerrpc.HtlcEvent
+	41, // 69: routerrpc.Router.SendPayment:output_type -> routerrpc.PaymentStatus
+	41, // 70: routerrpc.Router.TrackPayment:output_type -> routerrpc.PaymentStatus
+	43, // 71: routerrpc.Router.HtlcInterceptor:output_type -> routerrpc.ForwardHtlcInterceptRequest
+	46, // 72: routerrpc.Router.UpdateChanStatus:output_type -> routerrpc.UpdateChanStatusResponse
+	55, // [55:73] is the sub-list for method output_type
+	37, // [37:55] is the sub-list for method input_type
+	37, // [37:37] is the sub-list for extension type_name
+	37, // [37:37] is the sub-list for extension extendee
+	0,  // [0:37] is the sub-list for field type_name
 }
 
 func init() { file_routerrpc_router_proto_init() }
@@ -4583,7 +4627,7 @@ func file_routerrpc_router_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_routerrpc_router_proto_rawDesc,
 			NumEnums:      6,
-			NumMessages:   43,
+			NumMessages:   44,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto
index a909828803..19c1d8dd82 100644
--- a/lnrpc/routerrpc/router.proto
+++ b/lnrpc/routerrpc/router.proto
@@ -960,6 +960,8 @@ message ForwardHtlcInterceptRequest {
 ForwardHtlcInterceptResponse enables the caller to resolve a previously hold
 forward. The caller can choose either to:
 - `Resume`: Execute the default behavior (usually forward).
+- `ResumeModified`: Execute the default behavior (usually forward) with HTLC
+                    field modifications.
 - `Reject`: Fail the htlc backwards.
 - `Settle`: Settle this htlc with a given preimage.
 */
@@ -990,12 +992,24 @@ message ForwardHtlcInterceptResponse {
     // For backwards-compatibility reasons, TEMPORARY_CHANNEL_FAILURE is the
     // default value for this field.
     lnrpc.Failure.FailureCode failure_code = 5;
+
+    // outgoing_amount_msat is used to set the p2p message outgoing amount field
+    // for resuming a HTLC.
+    uint64 outgoing_amount_msat = 6;
+
+    // custom_records is used to set the p2p message custom records field for
+    // resuming a HTLC.
+    map<uint64, bytes> custom_records = 7;
 }
 
 enum ResolveHoldForwardAction {
     SETTLE = 0;
     FAIL = 1;
     RESUME = 2;
+
+    // RESUME_MODIFIED is an action that is used to resume a hold forward HTLC
+    // with modifications specified during interception.
+    RESUME_MODIFIED = 3;
 }
 
 message UpdateChanStatusRequest {
diff --git a/lnrpc/routerrpc/router.swagger.json b/lnrpc/routerrpc/router.swagger.json
index 8e1c646c13..0e3665948b 100644
--- a/lnrpc/routerrpc/router.swagger.json
+++ b/lnrpc/routerrpc/router.swagger.json
@@ -1343,9 +1343,22 @@
         "failure_code": {
           "$ref": "#/definitions/FailureFailureCode",
           "description": "Return the specified failure code in case the resolve action is Fail. The\nmessage data fields are populated automatically.\n\nIf a non-zero failure_code is specified, failure_message must not be set.\n\nFor backwards-compatibility reasons, TEMPORARY_CHANNEL_FAILURE is the\ndefault value for this field."
+        },
+        "outgoing_amount_msat": {
+          "type": "string",
+          "format": "uint64",
+          "description": "outgoing_amount_msat is used to set the p2p message outgoing amount field\nfor resuming a HTLC."
+        },
+        "custom_records": {
+          "type": "object",
+          "additionalProperties": {
+            "type": "string",
+            "format": "byte"
+          },
+          "description": "custom_records is used to set the p2p message custom records field for\nresuming a HTLC."
         }
       },
-      "description": "*\nForwardHtlcInterceptResponse enables the caller to resolve a previously hold\nforward. The caller can choose either to:\n- `Resume`: Execute the default behavior (usually forward).\n- `Reject`: Fail the htlc backwards.\n- `Settle`: Settle this htlc with a given preimage."
+      "description": "*\nForwardHtlcInterceptResponse enables the caller to resolve a previously hold\nforward. The caller can choose either to:\n- `Resume`: Execute the default behavior (usually forward).\n- `ResumeModified`: Execute the default behavior (usually forward) with HTLC\nfield modifications.\n- `Reject`: Fail the htlc backwards.\n- `Settle`: Settle this htlc with a given preimage."
     },
     "routerrpcGetMissionControlConfigResponse": {
       "type": "object",
@@ -1632,9 +1645,11 @@
       "enum": [
         "SETTLE",
         "FAIL",
-        "RESUME"
+        "RESUME",
+        "RESUME_MODIFIED"
       ],
-      "default": "SETTLE"
+      "default": "SETTLE",
+      "description": " - RESUME_MODIFIED: RESUME_MODIFIED is an action that is used to resume a hold forward HTLC\nwith modifications specified during interception."
     },
     "routerrpcRouteFeeRequest": {
       "type": "object",

From 8025296bc143d691f8e4d2e9979c4394615c4cf5 Mon Sep 17 00:00:00 2001
From: ffranr <robyn@lightning.engineering>
Date: Sat, 13 Apr 2024 11:39:51 +0100
Subject: [PATCH 14/15] itest: add itest for field modification HTLC
 interception response

Implement an integration test where an HTLC is intercepted and the
interception response modifies fields in the resultant p2p message.
---
 itest/list_on_test.go                 |   4 +
 itest/lnd_forward_interceptor_test.go | 135 ++++++++++++++++++++++++++
 2 files changed, 139 insertions(+)

diff --git a/itest/list_on_test.go b/itest/list_on_test.go
index b4f586fa21..ca197778d5 100644
--- a/itest/list_on_test.go
+++ b/itest/list_on_test.go
@@ -422,6 +422,10 @@ var allTestCases = []*lntest.TestCase{
 		Name:     "forward interceptor",
 		TestFunc: testForwardInterceptorBasic,
 	},
+	{
+		Name:     "forward interceptor modified htlc",
+		TestFunc: testForwardInterceptorModifiedHtlc,
+	},
 	{
 		Name:     "zero conf channel open",
 		TestFunc: testZeroConfChannelOpen,
diff --git a/itest/lnd_forward_interceptor_test.go b/itest/lnd_forward_interceptor_test.go
index b5d08f5bf8..213f777bef 100644
--- a/itest/lnd_forward_interceptor_test.go
+++ b/itest/lnd_forward_interceptor_test.go
@@ -1,6 +1,7 @@
 package itest
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
@@ -344,6 +345,140 @@ func testForwardInterceptorBasic(ht *lntest.HarnessTest) {
 	ht.CloseChannel(bob, cpBC)
 }
 
+// testForwardInterceptorModifiedHtlc tests that the interceptor can modify the
+// amount and custom records of an intercepted HTLC and resume it.
+func testForwardInterceptorModifiedHtlc(ht *lntest.HarnessTest) {
+	// Initialize the test context with 3 connected nodes.
+	ts := newInterceptorTestScenario(ht)
+
+	alice, bob, carol := ts.alice, ts.bob, ts.carol
+
+	// Open and wait for channels.
+	const chanAmt = btcutil.Amount(300000)
+	p := lntest.OpenChannelParams{Amt: chanAmt}
+	reqs := []*lntest.OpenChannelRequest{
+		{Local: alice, Remote: bob, Param: p},
+		{Local: bob, Remote: carol, Param: p},
+	}
+	resp := ht.OpenMultiChannelsAsync(reqs)
+	cpAB, cpBC := resp[0], resp[1]
+
+	// Make sure Alice is aware of channel Bob=>Carol.
+	ht.AssertTopologyChannelOpen(alice, cpBC)
+
+	// Connect an interceptor to Bob's node.
+	bobInterceptor, cancelBobInterceptor := bob.RPC.HtlcInterceptor()
+
+	// Prepare the test cases.
+	invoiceValueAmtMsat := int64(1000)
+	req := &lnrpc.Invoice{ValueMsat: invoiceValueAmtMsat}
+	addResponse := carol.RPC.AddInvoice(req)
+	invoice := carol.RPC.LookupInvoice(addResponse.RHash)
+	tc := &interceptorTestCase{
+		amountMsat: invoiceValueAmtMsat,
+		invoice:    invoice,
+		payAddr:    invoice.PaymentAddr,
+	}
+
+	// We initiate a payment from Alice.
+	done := make(chan struct{})
+	go func() {
+		// Signal that all the payments have been sent.
+		defer close(done)
+
+		ts.sendPaymentAndAssertAction(tc)
+	}()
+
+	// We start the htlc interceptor with a simple implementation that saves
+	// all intercepted packets. These packets are held to simulate a
+	// pending payment.
+	packet := ht.ReceiveHtlcInterceptor(bobInterceptor)
+
+	// Resume the intercepted HTLC with a modified amount and custom
+	// records.
+	if packet.CustomRecords == nil {
+		packet.CustomRecords = make(map[uint64][]byte)
+	}
+	customRecords := packet.CustomRecords
+
+	// Add custom records entry.
+	crKey := uint64(65537)
+	crValue := []byte("custom-records-test-value")
+	customRecords[crKey] = crValue
+
+	action := routerrpc.ResolveHoldForwardAction_RESUME_MODIFIED
+	newOutgoingAmountMsat := packet.OutgoingAmountMsat + 4000
+
+	err := bobInterceptor.Send(&routerrpc.ForwardHtlcInterceptResponse{
+		IncomingCircuitKey: packet.IncomingCircuitKey,
+		OutgoingAmountMsat: newOutgoingAmountMsat,
+		CustomRecords:      customRecords,
+		Action:             action,
+	})
+	require.NoError(ht, err, "failed to send request")
+
+	// Check that the modified UpdateAddHTLC message fields were reported in
+	// Carol's log.
+	targetLogPrefixStr := "Received UpdateAddHTLC("
+	targetOutgoingAmountMsatStr := fmt.Sprintf(
+		"amt=%d", newOutgoingAmountMsat,
+	)
+
+	// Formulate custom records target log string.
+	var asciiValues []string
+	for _, b := range crValue {
+		asciiValues = append(asciiValues, fmt.Sprintf("%d", b))
+	}
+
+	targetCustomRecordsStr := fmt.Sprintf(
+		"%d:[%s]", crKey, strings.Join(asciiValues, " "),
+	)
+
+	// logEntryCheck is a helper function that checks if the log entry
+	// contains the expected strings.
+	logEntryCheck := func(logEntry string) bool {
+		return strings.Contains(logEntry, targetLogPrefixStr) &&
+			strings.Contains(logEntry, targetCustomRecordsStr) &&
+			strings.Contains(logEntry, targetOutgoingAmountMsatStr)
+	}
+
+	// Wait for the log entry to appear in Carol's log.
+	require.Eventually(ht, func() bool {
+		ctx := context.Background()
+		dbgInfo, err := carol.RPC.LN.GetDebugInfo(
+			ctx, &lnrpc.GetDebugInfoRequest{},
+		)
+		require.NoError(ht, err, "failed to get Carol node debug info")
+
+		for _, logEntry := range dbgInfo.Log {
+			if logEntryCheck(logEntry) {
+				return true
+			}
+		}
+
+		return false
+	}, defaultTimeout, time.Second)
+
+	// Cancel the context, which will disconnect Bob's interceptor.
+	cancelBobInterceptor()
+
+	// Make sure all goroutines are finished.
+	select {
+	case <-done:
+	case <-time.After(defaultTimeout):
+		require.Fail(ht, "timeout waiting for sending payment")
+	}
+
+	// Assert that the payment was successful.
+	var preimage lntypes.Preimage
+	copy(preimage[:], invoice.RPreimage)
+	ht.AssertPaymentStatus(alice, preimage, lnrpc.Payment_SUCCEEDED)
+
+	// Finally, close channels.
+	ht.CloseChannel(alice, cpAB)
+	ht.CloseChannel(bob, cpBC)
+}
+
 // interceptorTestScenario is a helper struct to hold the test context and
 // provide the needed functionality.
 type interceptorTestScenario struct {

From 03dceca835d2b4c07995bb1590a68dcd105d368c Mon Sep 17 00:00:00 2001
From: Oliver Gugger <gugger@gmail.com>
Date: Fri, 3 May 2024 16:33:59 +0100
Subject: [PATCH 15/15] multi: add incoming htlc amount to interceptor

---
 htlcswitch/interceptable_switch.go     |  13 +-
 htlcswitch/interfaces.go               |   3 +-
 intercepted_forward.go                 |   2 +-
 lnrpc/routerrpc/forward_interceptor.go |   8 +
 lnrpc/routerrpc/router.pb.go           | 365 +++++++++++++------------
 lnrpc/routerrpc/router.proto           |   8 +-
 lnrpc/routerrpc/router.swagger.json    |   5 +
 7 files changed, 223 insertions(+), 181 deletions(-)

diff --git a/htlcswitch/interceptable_switch.go b/htlcswitch/interceptable_switch.go
index 52a57b095d..36fdd3cd5e 100644
--- a/htlcswitch/interceptable_switch.go
+++ b/htlcswitch/interceptable_switch.go
@@ -125,6 +125,10 @@ type FwdResolution struct {
 	// FwdActionSettle.
 	Preimage lntypes.Preimage
 
+	// IncomingAmountMsat is the amount that is to be used for validating if
+	// Action is FwdActionResumeModified.
+	IncomingAmountMsat fn.Option[lnwire.MilliSatoshi]
+
 	// OutgoingAmountMsat is the amount that is to be used for forwarding if
 	// Action is FwdActionResumeModified.
 	OutgoingAmountMsat fn.Option[lnwire.MilliSatoshi]
@@ -391,7 +395,8 @@ func (s *InterceptableSwitch) resolve(res *FwdResolution) error {
 
 	case FwdActionResumeModified:
 		return intercepted.ResumeModified(
-			res.OutgoingAmountMsat, res.CustomRecords,
+			res.IncomingAmountMsat, res.OutgoingAmountMsat,
+			res.CustomRecords,
 		)
 
 	case FwdActionSettle:
@@ -638,9 +643,15 @@ func (f *interceptedForward) Resume() error {
 
 // ResumeModified resumes the default behavior with field modifications.
 func (f *interceptedForward) ResumeModified(
+	incomingAmountMsat fn.Option[lnwire.MilliSatoshi],
 	outgoingAmountMsat fn.Option[lnwire.MilliSatoshi],
 	customRecords fn.Option[record.CustomSet]) error {
 
+	// Set the incoming amount, if it is provided, on the packet.
+	incomingAmountMsat.WhenSome(func(amount lnwire.MilliSatoshi) {
+		f.packet.incomingAmount = amount
+	})
+
 	// Modify the wire message contained in the packet.
 	switch htlc := f.packet.htlc.(type) {
 	case *lnwire.UpdateAddHTLC:
diff --git a/htlcswitch/interfaces.go b/htlcswitch/interfaces.go
index a8d77d6e64..39ced6ca82 100644
--- a/htlcswitch/interfaces.go
+++ b/htlcswitch/interfaces.go
@@ -378,7 +378,8 @@ type InterceptedForward interface {
 
 	// ResumeModified notifies the intention to resume an existing hold
 	// forward with modified fields.
-	ResumeModified(outgoingAmountMsat fn.Option[lnwire.MilliSatoshi],
+	ResumeModified(incomingAmountMsat,
+		outgoingAmountMsat fn.Option[lnwire.MilliSatoshi],
 		customRecords fn.Option[record.CustomSet]) error
 
 	// Settle notifies the intention to settle an existing hold
diff --git a/intercepted_forward.go b/intercepted_forward.go
index 044abd3fed..1bc56a6e49 100644
--- a/intercepted_forward.go
+++ b/intercepted_forward.go
@@ -55,7 +55,7 @@ func (f *interceptedForward) Resume() error {
 
 // ResumeModified notifies the intention to resume an existing hold forward with
 // a modified htlc.
-func (f *interceptedForward) ResumeModified(_ fn.Option[lnwire.MilliSatoshi],
+func (f *interceptedForward) ResumeModified(_, _ fn.Option[lnwire.MilliSatoshi],
 	_ fn.Option[record.CustomSet]) error {
 
 	return ErrCannotResume
diff --git a/lnrpc/routerrpc/forward_interceptor.go b/lnrpc/routerrpc/forward_interceptor.go
index a2b82df858..ef8741778c 100644
--- a/lnrpc/routerrpc/forward_interceptor.go
+++ b/lnrpc/routerrpc/forward_interceptor.go
@@ -123,6 +123,13 @@ func (r *forwardInterceptor) resolveFromClient(
 
 	case ResolveHoldForwardAction_RESUME_MODIFIED:
 		// Modify HTLC and resume forward.
+		incomingAmtMsat := fn.None[lnwire.MilliSatoshi]()
+		if in.IncomingAmountMsat > 0 {
+			incomingAmtMsat = fn.Some[lnwire.MilliSatoshi](
+				lnwire.MilliSatoshi(in.IncomingAmountMsat),
+			)
+		}
+
 		outgoingAmtMsat := fn.None[lnwire.MilliSatoshi]()
 		if in.OutgoingAmountMsat > 0 {
 			outgoingAmtMsat = fn.Some[lnwire.MilliSatoshi](
@@ -148,6 +155,7 @@ func (r *forwardInterceptor) resolveFromClient(
 		return r.htlcSwitch.Resolve(&htlcswitch.FwdResolution{
 			Key:                circuitKey,
 			Action:             htlcswitch.FwdActionResumeModified,
+			IncomingAmountMsat: incomingAmtMsat,
 			OutgoingAmountMsat: outgoingAmtMsat,
 			CustomRecords:      customRecords,
 		})
diff --git a/lnrpc/routerrpc/router.pb.go b/lnrpc/routerrpc/router.pb.go
index f3c6310ebc..b3914862a5 100644
--- a/lnrpc/routerrpc/router.pb.go
+++ b/lnrpc/routerrpc/router.pb.go
@@ -3178,12 +3178,15 @@ type ForwardHtlcInterceptResponse struct {
 	// For backwards-compatibility reasons, TEMPORARY_CHANNEL_FAILURE is the
 	// default value for this field.
 	FailureCode lnrpc.Failure_FailureCode `protobuf:"varint,5,opt,name=failure_code,json=failureCode,proto3,enum=lnrpc.Failure_FailureCode" json:"failure_code,omitempty"`
+	// incoming_amount_msat is used to set the p2p message incoming amount field
+	// for validating an incoming HTLC.
+	IncomingAmountMsat uint64 `protobuf:"varint,6,opt,name=incoming_amount_msat,json=incomingAmountMsat,proto3" json:"incoming_amount_msat,omitempty"`
 	// outgoing_amount_msat is used to set the p2p message outgoing amount field
 	// for resuming a HTLC.
-	OutgoingAmountMsat uint64 `protobuf:"varint,6,opt,name=outgoing_amount_msat,json=outgoingAmountMsat,proto3" json:"outgoing_amount_msat,omitempty"`
+	OutgoingAmountMsat uint64 `protobuf:"varint,7,opt,name=outgoing_amount_msat,json=outgoingAmountMsat,proto3" json:"outgoing_amount_msat,omitempty"`
 	// custom_records is used to set the p2p message custom records field for
 	// resuming a HTLC.
-	CustomRecords map[uint64][]byte `protobuf:"bytes,7,rep,name=custom_records,json=customRecords,proto3" json:"custom_records,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	CustomRecords map[uint64][]byte `protobuf:"bytes,8,rep,name=custom_records,json=customRecords,proto3" json:"custom_records,omitempty" protobuf_key:"varint,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *ForwardHtlcInterceptResponse) Reset() {
@@ -3253,6 +3256,13 @@ func (x *ForwardHtlcInterceptResponse) GetFailureCode() lnrpc.Failure_FailureCod
 	return lnrpc.Failure_FailureCode(0)
 }
 
+func (x *ForwardHtlcInterceptResponse) GetIncomingAmountMsat() uint64 {
+	if x != nil {
+		return x.IncomingAmountMsat
+	}
+	return 0
+}
+
 func (x *ForwardHtlcInterceptResponse) GetOutgoingAmountMsat() uint64 {
 	if x != nil {
 		return x.OutgoingAmountMsat
@@ -3754,7 +3764,7 @@ var file_routerrpc_router_proto_rawDesc = []byte{
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@@ -3773,185 +3783,188 @@ var file_routerrpc_router_proto_rawDesc = []byte{
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 }
 
 var (
diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto
index 19c1d8dd82..63faad8fe5 100644
--- a/lnrpc/routerrpc/router.proto
+++ b/lnrpc/routerrpc/router.proto
@@ -993,13 +993,17 @@ message ForwardHtlcInterceptResponse {
     // default value for this field.
     lnrpc.Failure.FailureCode failure_code = 5;
 
+    // incoming_amount_msat is used to set the p2p message incoming amount field
+    // for validating an incoming HTLC.
+    uint64 incoming_amount_msat = 6;
+
     // outgoing_amount_msat is used to set the p2p message outgoing amount field
     // for resuming a HTLC.
-    uint64 outgoing_amount_msat = 6;
+    uint64 outgoing_amount_msat = 7;
 
     // custom_records is used to set the p2p message custom records field for
     // resuming a HTLC.
-    map<uint64, bytes> custom_records = 7;
+    map<uint64, bytes> custom_records = 8;
 }
 
 enum ResolveHoldForwardAction {
diff --git a/lnrpc/routerrpc/router.swagger.json b/lnrpc/routerrpc/router.swagger.json
index 0e3665948b..d13111ea7c 100644
--- a/lnrpc/routerrpc/router.swagger.json
+++ b/lnrpc/routerrpc/router.swagger.json
@@ -1344,6 +1344,11 @@
           "$ref": "#/definitions/FailureFailureCode",
           "description": "Return the specified failure code in case the resolve action is Fail. The\nmessage data fields are populated automatically.\n\nIf a non-zero failure_code is specified, failure_message must not be set.\n\nFor backwards-compatibility reasons, TEMPORARY_CHANNEL_FAILURE is the\ndefault value for this field."
         },
+        "incoming_amount_msat": {
+          "type": "string",
+          "format": "uint64",
+          "description": "incoming_amount_msat is used to set the p2p message incoming amount field\nfor validating an incoming HTLC."
+        },
         "outgoing_amount_msat": {
           "type": "string",
           "format": "uint64",