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lnwallet: call valdiateCommitmentSanity in ReceiveHTLC

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This commit checks the commitment sanity when receiving an HTLC so
that if a commitment transaction will overflow from an ADD, it is
caught earlier rather than in ReceiveNewCommitment.
This commit is contained in:
nsa 2020-02-15 09:45:25 -05:00
parent b75259a3e2
commit 56c07a52d8
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GPG Key ID: 118759E83439A9B1
1 changed files with 20 additions and 5 deletions
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25
lnwallet/channel.go
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@ -3084,12 +3084,16 @@ func (lc *LightningChannel) validateCommitmentSanity(theirLogCounter,
view := lc.fetchHTLCView(theirLogCounter, ourLogCounter)
// If we are checking if we can add a new HTLC, we add this to the
// update log, in order to validate the sanity of the commitment
// resulting from _actually adding_ this HTLC to the state.
// appropriate update log, in order to validate the sanity of the
// commitment resulting from _actually adding_ this HTLC to the state.
if predictAdded != nil {
// If we are adding an HTLC, this will be an Add to the local
// update log.
view.ourUpdates = append(view.ourUpdates, predictAdded)
// If the remoteChain bool is true, add to ourUpdates.
if remoteChain {
view.ourUpdates = append(view.ourUpdates, predictAdded)
} else {
// Else add to theirUpdates.
view.theirUpdates = append(view.theirUpdates, predictAdded)
}
}
commitChain := lc.localCommitChain
@ -4640,6 +4644,17 @@ func (lc *LightningChannel) ReceiveHTLC(htlc *lnwire.UpdateAddHTLC) (uint64, err
OnionBlob: htlc.OnionBlob[:],
}
localACKedIndex := lc.remoteCommitChain.tail().ourMessageIndex
// Clamp down on the number of HTLC's we can receive by checking the
// commitment sanity.
err := lc.validateCommitmentSanity(
lc.remoteUpdateLog.logIndex, localACKedIndex, false, pd,
)
if err != nil {
return 0, err
}
lc.remoteUpdateLog.appendHtlc(pd)
return pd.HtlcIndex, nil