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htlcswitch: override amount check on custom records

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Oliver Gugger committed 2024-09-18 19:07:27 +02:00
1 parent cdc3a4a6c6
commit 52e50d807d
1 file changed
+12 -1
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htlcswitch/link.go
+12 -1
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@@ -3793,7 +3793,18 @@ func (l *channelLink) processExitHop(add lnwire.UpdateAddHTLC,
// As we're the exit hop, we'll double check the hop-payload included in // As we're the exit hop, we'll double check the hop-payload included in
// the HTLC to ensure that it was crafted correctly by the sender and // the HTLC to ensure that it was crafted correctly by the sender and
// is compatible with the HTLC we were extended. // is compatible with the HTLC we were extended.
if add.Amount < fwdInfo.AmountToForward { //
// For a special case, if the fwdInfo doesn't have any blinded path
// information, and the incoming HTLC had special extra data, then
// we'll skip this amount check. The invoice acceptor will make sure we
// reject the HTLC if it's not containing the correct amount after
// examining the custom data.
hasBlindedPath := fwdInfo.NextBlinding.IsSome()
customHTLC := len(add.CustomRecords) > 0 && !hasBlindedPath
log.Tracef("Exit hop has_blinded_path=%v custom_htlc_bypass=%v",
hasBlindedPath, customHTLC)
if !customHTLC && add.Amount < fwdInfo.AmountToForward {
l.log.Errorf("onion payload of incoming htlc(%x) has "+ l.log.Errorf("onion payload of incoming htlc(%x) has "+
"incompatible value: expected <=%v, got %v", "incompatible value: expected <=%v, got %v",
add.PaymentHash, add.Amount, fwdInfo.AmountToForward) add.PaymentHash, add.Amount, fwdInfo.AmountToForward)