highperfocused/lnd
1
0
Fork 0
mirror of https://github.com/lightningnetwork/lnd.git synced 2025-03-26 01:33:02 +01:00
Code Issues Packages Projects Releases Wiki Activity

htlcswitch: allow custom HTLCs to bypass the amt to fwrd check

Browse Source 
As this is a exit hop HTLC, we'll rely on the decision from the invoice registry to decide if we should continue or not.
This commit is contained in:
Olaoluwa Osuntokun 2024-05-07 21:31:41 -07:00
parent 3b8a3fac10
commit cd0e15fd73
1 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
htlcswitch/link.go
View File

@ -3566,13 +3566,20 @@ func (l *channelLink) processExitHop(pd *lnwallet.PaymentDescriptor,
return nil
}
// 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
// is compatible with the HTLC we were extended.
if pd.Amount < fwdInfo.AmountToForward {
// 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 is compatible with the HTLC we were extended.
//
// 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.
hasBlindedPath := fwdInfo.NextBlinding.IsSome()
customHTLC := pd.CustomRecords.IsSome() && !hasBlindedPath
log.Infof("custom_htlc_bypass=%v", customHTLC)
if !customHTLC && pd.Amount < fwdInfo.AmountToForward {
l.log.Errorf("onion payload of incoming htlc(%x) has "+
"incompatible value: expected <=%v, got %v", pd.RHash,
pd.Amount, fwdInfo.AmountToForward)
fwdInfo.AmountToForward, pd.Amount)
failure := NewLinkError(
lnwire.NewFinalIncorrectHtlcAmount(pd.Amount),