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Fix comparison in get_dust_buffer_feerate #2971

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Merged
merged 1 commit into from
Apr 13, 2024
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Fix comparison in get_dust_buffer_feerate #2971

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2 changes: 1 addition & 1 deletion lightning/src/ln/channel.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2730,7 +2730,7 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider {
feerate_per_kw = cmp::max(feerate_per_kw, feerate);
}
let feerate_plus_quarter = feerate_per_kw.checked_mul(1250).map(|v| v / 1000);
cmp::max(2530, feerate_plus_quarter.unwrap_or(u32::max_value()))
cmp::max(feerate_per_kw + 2530, feerate_plus_quarter.unwrap_or(u32::max_value()))
}

/// Get forwarding information for the counterparty.
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5 changes: 4 additions & 1 deletion lightning/src/ln/functional_tests.rs
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Expand Up @@ -9950,7 +9950,10 @@ fn do_test_max_dust_htlc_exposure(dust_outbound_balance: bool, exposure_breach_e
let dust_outbound_htlc_on_holder_tx_msat: u64 = (dust_buffer_feerate * htlc_timeout_tx_weight(&channel_type_features) / 1000 + open_channel.common_fields.dust_limit_satoshis - 1) * 1000;
let dust_outbound_htlc_on_holder_tx: u64 = max_dust_htlc_exposure_msat / dust_outbound_htlc_on_holder_tx_msat;

let dust_inbound_htlc_on_holder_tx_msat: u64 = (dust_buffer_feerate * htlc_success_tx_weight(&channel_type_features) / 1000 + open_channel.common_fields.dust_limit_satoshis - 1) * 1000;
// Substract 3 sats for multiplier and 2 sats for fixed limit to make sure we are 50% below the dust limit.
// This is to make sure we fully use the dust limit. If we don't, we could end up with `dust_ibd_htlc_on_holder_tx` being 1
// while `max_dust_htlc_exposure_msat` is not equal to `dust_outbound_htlc_on_holder_tx_msat`.
let dust_inbound_htlc_on_holder_tx_msat: u64 = (dust_buffer_feerate * htlc_success_tx_weight(&channel_type_features) / 1000 + open_channel.common_fields.dust_limit_satoshis - if multiplier_dust_limit { 3 } else { 2 }) * 1000;
let dust_inbound_htlc_on_holder_tx: u64 = max_dust_htlc_exposure_msat / dust_inbound_htlc_on_holder_tx_msat;

let dust_htlc_on_counterparty_tx: u64 = 4;
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