Replace config max counterpary `dust_limit_satoshis` by a constant.

Current Bitcoin Core's policy will reject a p2wsh as a dust if it's
under 330 satoshis. A typical p2wsh output is 43 bytes big to which
Core's `GetDustThreshold()` sums up a minimal spend of 67 bytes (even
if a p2wsh witnessScript might be smaller). `dustRelayFee` is set
to 3000 sat/kb, thus 110 * 3000 / 1000 = 330. As all time-sensitive
outputs are p2wsh, a value of 330 sat is the lower bound desired
to ensure good propagation of transactions. We give a bit margin to
our counterparty and pick up 660 satoshis as an accepted
`dust_limit_satoshis` upper bound.

As this reasoning is tricky and error-prone we hardcode it instead of
letting the user picking up a non-sense value.

Further, this lower bound of 330 sats is also hardcoded as another constant
(MIN_DUST_LIMIT_SATOSHIS) instead of being dynamically computed on
feerate (derive_holder_dust_limit_satoshis`). Reducing risks of
non-propagating transactions in casee of failing fee festimation.

diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs
index 96da87b624e4e54d8950fde5ecb55b376be2d69d..45b10ca561da2926082d5dfab7ea0b8d2a4698ec 100644 (file)
--- a/fuzz/src/chanmon_consistency.rs
+++ b/fuzz/src/chanmon_consistency.rs
@@ -319,7 +319,6 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
                        let mut config = UserConfig::default();
                        config.channel_options.fee_proportional_millionths = 0;
                        config.channel_options.announced_channel = true;
-                       config.peer_channel_config_limits.min_dust_limit_satoshis = 0;
                        let network = Network::Bitcoin;
                        let params = ChainParameters {
                                network,
@@ -339,7 +338,6 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
                        let mut config = UserConfig::default();
                        config.channel_options.fee_proportional_millionths = 0;
                        config.channel_options.announced_channel = true;
-                       config.peer_channel_config_limits.min_dust_limit_satoshis = 0;
 
                        let mut monitors = HashMap::new();
                        let mut old_monitors = $old_monitors.latest_monitors.lock().unwrap();

diff --git a/fuzz/src/full_stack.rs b/fuzz/src/full_stack.rs
index 73a9a67a74ef8ed5b774abd20905635e531ea73e..159b0f04e47bf829e61db658ab6fdfb5a6c848e2 100644 (file)
--- a/fuzz/src/full_stack.rs
+++ b/fuzz/src/full_stack.rs
@@ -354,7 +354,6 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
        let mut config = UserConfig::default();
        config.channel_options.fee_proportional_millionths =  slice_to_be32(get_slice!(4));
        config.channel_options.announced_channel = get_slice!(1)[0] != 0;
-       config.peer_channel_config_limits.min_dust_limit_satoshis = 0;
        let network = Network::Bitcoin;
        let params = ChainParameters {
                network,
@@ -650,7 +649,7 @@ mod tests {
                // 030012 - inbound read from peer id 0 of len 18
                // 0141 03000000000000000000000000000000 - message header indicating message length 321
                // 0300fe - inbound read from peer id 0 of len 254
-               // 0020 7500000000000000000000000000000000000000000000000000000000000000 ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679 000000000000c350 0000000000000000 0000000000000222 ffffffffffffffff 0000000000000222 0000000000000000 000000fd 0006 01e3 030000000000000000000000000000000000000000000000000000000000000001 030000000000000000000000000000000000000000000000000000000000000002 030000000000000000000000000000000000000000000000000000000000000003 030000000000000000000000000000000000000000000000000000000000000004 - beginning of open_channel message
+               // 0020 7500000000000000000000000000000000000000000000000000000000000000 ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679 000000000000c350 0000000000000000 000000000000014a ffffffffffffffff 0000000000000222 0000000000000000 000000fd 0006 01e3 030000000000000000000000000000000000000000000000000000000000000001 030000000000000000000000000000000000000000000000000000000000000002 030000000000000000000000000000000000000000000000000000000000000003 030000000000000000000000000000000000000000000000000000000000000004 - beginning of open_channel message
                // 030053 - inbound read from peer id 0 of len 83
                // 030000000000000000000000000000000000000000000000000000000000000005 020900000000000000000000000000000000000000000000000000000000000000 01 03000000000000000000000000000000 - rest of open_channel and mac
                //
@@ -696,12 +695,12 @@ mod tests {
                // 0010 00022000 00022000 01000000000000000000000000000000 - init message (type 16) with static_remotekey (0x2000) and mac
                //
                // 05 01 030200000000000000000000000000000000000000000000000000000000000000 00c350 0003e8 - create outbound channel to peer 1 for 50k sat
-               // 00fd00fd - Two feerate requests (all returning min feerate) (gonna be ingested by FuzzEstimator)
+               // 00fd - One feerate requests (all returning min feerate) (gonna be ingested by FuzzEstimator)
                //
                // 030112 - inbound read from peer id 1 of len 18
                // 0110 01000000000000000000000000000000 - message header indicating message length 272
                // 0301ff - inbound read from peer id 1 of len 255
-               // 0021 0000000000000000000000000000000000000000000000000000000000000e05 000000000000001a 00000000004c4b40 00000000000003e8 00000000000003e8 00000002 03f0 0005 030000000000000000000000000000000000000000000000000000000000000100 030000000000000000000000000000000000000000000000000000000000000200 030000000000000000000000000000000000000000000000000000000000000300 030000000000000000000000000000000000000000000000000000000000000400 030000000000000000000000000000000000000000000000000000000000000500 02660000000000000000000000000000 - beginning of accept_channel
+               // 0021 0000000000000000000000000000000000000000000000000000000000000e05 000000000000014a 00000000004c4b40 00000000000003e8 00000000000003e8 00000002 03f0 0005 030000000000000000000000000000000000000000000000000000000000000100 030000000000000000000000000000000000000000000000000000000000000200 030000000000000000000000000000000000000000000000000000000000000300 030000000000000000000000000000000000000000000000000000000000000400 030000000000000000000000000000000000000000000000000000000000000500 02660000000000000000000000000000 - beginning of accept_channel
                // 030121 - inbound read from peer id 1 of len 33
                // 0000000000000000000000000000000000 01000000000000000000000000000000 - rest of accept_channel and mac
                //
@@ -888,24 +887,22 @@ mod tests {
                // 07 - process the now-pending HTLC forward
                // - client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
                //
-               // 0c007d - connect a block with one transaction of len 125
-               // 02000000013a0000000000000000000000000000000000000000000000000000000000000000000000000000008002000100000000000022002093000000000000000000000000000000000000000000000000000000000000006cc1000000000000160014280000000000000000000000000000000000000005000020 - the commitment transaction for channel 3f00000000000000000000000000000000000000000000000000000000000000
-               // 00fd - A feerate request (returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
-               // 00fd - A feerate request (returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
                // 0c005e - connect a block with one transaction of len 94
+               // 02000000013a000000000000000000000000000000000000000000000000000000000000000000000000000000800197c1000000000000160014280000000000000000000000000000000000000005000020 - the commitment transaction for channel 3f00000000000000000000000000000000000000000000000000000000000000
+               // 00fd - A feerate request (returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
+               // 0c0000 - connect a block with no transactions
                // 02000000018900000000000000000000000000000000000000000000000000000000000000000000000000000000014f00000000000000220020b20000000000000000000000000000000000000000000000000000000000000000000000 - the HTLC timeout transaction
                // 0c0000 - connect a block with no transactions
                // 0c0000 - connect a block with no transactions
-               // 00fd - A feerate request (returning min feerate, which our open_channel also uses) (gonna be ingested by FuzzEstimator)
                // 0c0000 - connect a block with no transactions
                // 0c0000 - connect a block with no transactions
                // 0c0000 - connect a block with no transactions
                //
                // 07 - process the now-pending HTLC forward
-               // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate and CHECK 10)
+               // - client now fails the HTLC backwards as it was unable to extract the payment preimage (CHECK 9 duplicate)
 
                let logger = Arc::new(TrackingLogger { lines: Mutex::new(HashMap::new()) });
-               super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<dyn Logger>));
+               super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc<dyn Logger>));
 
                let log_entries = logger.lines.lock().unwrap();
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling SendAcceptChannel event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000002 for channel ff4f00f805273c1b203bb5ebf8436bfde57b3be8c2f5e95d9491dbb181909679".to_string())), Some(&1)); // 1
@@ -917,6 +914,5 @@ mod tests {
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030200000000000000000000000000000000000000000000000000000000000000 with 1 adds, 0 fulfills, 0 fails for channel 3a00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&3)); // 7
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000002 with 0 adds, 1 fulfills, 0 fails for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&1)); // 8
                assert_eq!(log_entries.get(&("lightning::ln::peer_handler".to_string(), "Handling UpdateHTLCs event in peer_handler for node 030000000000000000000000000000000000000000000000000000000000000002 with 0 adds, 0 fulfills, 1 fails for channel 3d00000000000000000000000000000000000000000000000000000000000000".to_string())), Some(&2)); // 9
-               assert_eq!(log_entries.get(&("lightning::chain::channelmonitor".to_string(), "Input spending counterparty commitment tx (0000000000000000000000000000000000000000000000000000000000000089:0) in 0000000000000000000000000000000000000000000000000000000000000074 resolves outbound HTLC with payment hash ff00000000000000000000000000000000000000000000000000000000000000 with timeout".to_string())), Some(&1)); // 10
        }
 }

diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs
index 8a1489d4ef775c7be7d515bcc3153895437eb726..4d592dc552c9844576ac9786479c64f6ef5cffe9 100644 (file)
--- a/lightning/src/ln/channel.rs
+++ b/lightning/src/ln/channel.rs
@@ -438,7 +438,6 @@ struct CommitmentTxInfoCached {
 
 pub const OUR_MAX_HTLCS: u16 = 50; //TODO
 const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
-const B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT: u64 = 104; // prevout: 40, nSequence: 4, script len: 1, witness lengths: 3/4, sig: 73/4, pubkey: 33/4, output: 31 (TODO: Wrong? Useless?)
 
 #[cfg(not(test))]
 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
@@ -453,6 +452,22 @@ pub const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
 /// it's 2^24.
 pub const MAX_FUNDING_SATOSHIS: u64 = 1 << 24;
 
+/// Maximum counterparty `dust_limit_satoshis` allowed. 2 * standard dust threshold on p2wsh output
+/// Scales up on Bitcoin Core's proceeding policy with dust outputs. A typical p2wsh output is 43
+/// bytes to which Core's `GetDustThreshold()` sums up a minimal spend of 67 bytes (even if
+/// a p2wsh witnessScript might be *effectively* smaller), `dustRelayFee` is set to 3000sat/kb, thus
+/// 110 * 3000 / 1000 = 330. Per-protocol rules, all time-sensitive outputs are p2wsh, a value of
+/// 330 sats is the lower bound desired to ensure good propagation of transactions. We give a bit
+/// of margin to our counterparty and pick up 660 satoshis as an accepted `dust_limit_satoshis`
+/// upper bound to avoid negotiation conflicts with other implementations.
+pub const MAX_DUST_LIMIT_SATOSHIS: u64 = 2 * 330;
+
+/// A typical p2wsh output is 43 bytes to which Core's `GetDustThreshold()` sums up a minimal
+/// spend of 67 bytes (even if a p2wsh witnessScript might be *effectively* smaller), `dustRelayFee`
+/// is set to 3000sat/kb, thus 110 * 3000 / 1000 = 330. Per-protocol rules, all time-sensitive outputs
+/// are p2wsh, a value of 330 sats is the lower bound desired to ensure good propagation of transactions.
+pub const MIN_DUST_LIMIT_SATOSHIS: u64 = 330;
+
 /// Used to return a simple Error back to ChannelManager. Will get converted to a
 /// msgs::ErrorAction::SendErrorMessage or msgs::ErrorAction::IgnoreError as appropriate with our
 /// channel_id in ChannelManager.
@@ -496,10 +511,6 @@ impl<Signer: Sign> Channel<Signer> {
                cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
        }
 
-       fn derive_holder_dust_limit_satoshis(at_open_background_feerate: u32) -> u64 {
-               cmp::max(at_open_background_feerate as u64 * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT / 1000, 546) //TODO
-       }
-
        // Constructors:
        pub fn new_outbound<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64, config: &UserConfig) -> Result<Channel<Signer>, APIError>
        where K::Target: KeysInterface<Signer = Signer>,
@@ -519,9 +530,9 @@ impl<Signer: Sign> Channel<Signer> {
                if holder_selected_contest_delay < BREAKDOWN_TIMEOUT {
                        return Err(APIError::APIMisuseError {err: format!("Configured with an unreasonable our_to_self_delay ({}) putting user funds at risks", holder_selected_contest_delay)});
                }
-               let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
-               if Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(channel_value_satoshis) < Channel::<Signer>::derive_holder_dust_limit_satoshis(background_feerate) {
-                       return Err(APIError::FeeRateTooHigh{err: format!("Not enough reserve above dust limit can be found at current fee rate({})", background_feerate), feerate: background_feerate});
+               let holder_selected_channel_reserve_satoshis = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(channel_value_satoshis);
+               if holder_selected_channel_reserve_satoshis < MIN_DUST_LIMIT_SATOSHIS {
+                       return Err(APIError::APIMisuseError { err: format!("Holder selected channel  reserve below implemention limit dust_limit_satoshis {}", holder_selected_channel_reserve_satoshis) });
                }
 
                let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
@@ -578,7 +589,7 @@ impl<Signer: Sign> Channel<Signer> {
 
                        feerate_per_kw: feerate,
                        counterparty_dust_limit_satoshis: 0,
-                       holder_dust_limit_satoshis: Channel::<Signer>::derive_holder_dust_limit_satoshis(background_feerate),
+                       holder_dust_limit_satoshis: MIN_DUST_LIMIT_SATOSHIS,
                        counterparty_max_htlc_value_in_flight_msat: 0,
                        counterparty_selected_channel_reserve_satoshis: 0,
                        counterparty_htlc_minimum_msat: 0,
@@ -699,11 +710,11 @@ impl<Signer: Sign> Channel<Signer> {
                if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs {
                        return Err(ChannelError::Close(format!("max_accepted_htlcs ({}) is less than the user specified limit ({})", msg.max_accepted_htlcs, config.peer_channel_config_limits.min_max_accepted_htlcs)));
                }
-               if msg.dust_limit_satoshis < config.peer_channel_config_limits.min_dust_limit_satoshis {
-                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the user specified limit ({})", msg.dust_limit_satoshis, config.peer_channel_config_limits.min_dust_limit_satoshis)));
+               if msg.dust_limit_satoshis < MIN_DUST_LIMIT_SATOSHIS {
+                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_DUST_LIMIT_SATOSHIS)));
                }
-               if msg.dust_limit_satoshis > config.peer_channel_config_limits.max_dust_limit_satoshis {
-                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the user specified limit ({})", msg.dust_limit_satoshis, config.peer_channel_config_limits.max_dust_limit_satoshis)));
+               if msg.dust_limit_satoshis >  MAX_DUST_LIMIT_SATOSHIS {
+                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_DUST_LIMIT_SATOSHIS)));
                }
 
                // Convert things into internal flags and prep our state:
@@ -719,13 +730,12 @@ impl<Signer: Sign> Channel<Signer> {
 
                let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
 
-               let holder_dust_limit_satoshis = Channel::<Signer>::derive_holder_dust_limit_satoshis(background_feerate);
                let holder_selected_channel_reserve_satoshis = Channel::<Signer>::get_holder_selected_channel_reserve_satoshis(msg.funding_satoshis);
-               if holder_selected_channel_reserve_satoshis < holder_dust_limit_satoshis {
-                       return Err(ChannelError::Close(format!("Suitable channel reserve not found. remote_channel_reserve was ({}). dust_limit_satoshis is ({}).", holder_selected_channel_reserve_satoshis, holder_dust_limit_satoshis)));
+               if holder_selected_channel_reserve_satoshis < MIN_DUST_LIMIT_SATOSHIS {
+                       return Err(ChannelError::Close(format!("Suitable channel reserve not found. remote_channel_reserve was ({}). dust_limit_satoshis is ({}).", holder_selected_channel_reserve_satoshis, MIN_DUST_LIMIT_SATOSHIS)));
                }
-               if msg.channel_reserve_satoshis < holder_dust_limit_satoshis {
-                       return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is smaller than our dust limit ({})", msg.channel_reserve_satoshis, holder_dust_limit_satoshis)));
+               if msg.channel_reserve_satoshis < MIN_DUST_LIMIT_SATOSHIS {
+                       return Err(ChannelError::Close(format!("channel_reserve_satoshis ({}) is smaller than our dust limit ({})", msg.channel_reserve_satoshis, MIN_DUST_LIMIT_SATOSHIS)));
                }
                if holder_selected_channel_reserve_satoshis < msg.dust_limit_satoshis {
                        return Err(ChannelError::Close(format!("Dust limit ({}) too high for the channel reserve we require the remote to keep ({})", msg.dust_limit_satoshis, holder_selected_channel_reserve_satoshis)));
@@ -817,7 +827,7 @@ impl<Signer: Sign> Channel<Signer> {
                        feerate_per_kw: msg.feerate_per_kw,
                        channel_value_satoshis: msg.funding_satoshis,
                        counterparty_dust_limit_satoshis: msg.dust_limit_satoshis,
-                       holder_dust_limit_satoshis,
+                       holder_dust_limit_satoshis: MIN_DUST_LIMIT_SATOSHIS,
                        counterparty_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
                        counterparty_selected_channel_reserve_satoshis: msg.channel_reserve_satoshis,
                        counterparty_htlc_minimum_msat: msg.htlc_minimum_msat,
@@ -1441,11 +1451,11 @@ impl<Signer: Sign> Channel<Signer> {
                if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs {
                        return Err(ChannelError::Close(format!("max_accepted_htlcs ({}) is less than the user specified limit ({})", msg.max_accepted_htlcs, config.peer_channel_config_limits.min_max_accepted_htlcs)));
                }
-               if msg.dust_limit_satoshis < config.peer_channel_config_limits.min_dust_limit_satoshis {
-                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the user specified limit ({})", msg.dust_limit_satoshis, config.peer_channel_config_limits.min_dust_limit_satoshis)));
+               if msg.dust_limit_satoshis < MIN_DUST_LIMIT_SATOSHIS {
+                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is less than the implementation limit ({})", msg.dust_limit_satoshis, MIN_DUST_LIMIT_SATOSHIS)));
                }
-               if msg.dust_limit_satoshis > config.peer_channel_config_limits.max_dust_limit_satoshis {
-                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the user specified limit ({})", msg.dust_limit_satoshis, config.peer_channel_config_limits.max_dust_limit_satoshis)));
+               if msg.dust_limit_satoshis > MAX_DUST_LIMIT_SATOSHIS {
+                       return Err(ChannelError::Close(format!("dust_limit_satoshis ({}) is greater than the implementation limit ({})", msg.dust_limit_satoshis, MAX_DUST_LIMIT_SATOSHIS)));
                }
                if msg.minimum_depth > config.peer_channel_config_limits.max_minimum_depth {
                        return Err(ChannelError::Close(format!("We consider the minimum depth to be unreasonably large. Expected minimum: ({}). Actual: ({})", config.peer_channel_config_limits.max_minimum_depth, msg.minimum_depth)));
@@ -4935,7 +4945,6 @@ mod tests {
                // Create Node B's channel by receiving Node A's open_channel message
                // Make sure A's dust limit is as we expect.
                let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.block_hash());
-               assert_eq!(open_channel_msg.dust_limit_satoshis, 1560);
                let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
                let node_b_chan = Channel::<EnforcingSigner>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, InitFeatures::known(), &open_channel_msg, 7, &config).unwrap();
 
@@ -4943,6 +4952,7 @@ mod tests {
                let mut accept_channel_msg = node_b_chan.get_accept_channel();
                accept_channel_msg.dust_limit_satoshis = 546;
                node_a_chan.accept_channel(&accept_channel_msg, &config, InitFeatures::known()).unwrap();
+               node_a_chan.holder_dust_limit_satoshis = 1560;
 
                // Put some inbound and outbound HTLCs in A's channel.
                let htlc_amount_msat = 11_092_000; // put an amount below A's effective dust limit but above B's.

diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs
index 7a39db2f312b1bf97b7a340906d55018b6d13e53..b88ee21a68dc106816b685005f65120ed47f5db0 100644 (file)
--- a/lightning/src/ln/functional_tests.rs
+++ b/lightning/src/ln/functional_tests.rs
@@ -1792,7 +1792,7 @@ fn test_chan_reserve_dust_inbound_htlcs_outbound_chan() {
        // transaction fee with 0 HTLCs (183 sats)).
        create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 100000, 98817000, InitFeatures::known(), InitFeatures::known());
 
-       let dust_amt = 546000; // Dust amount
+       let dust_amt = 329000; // Dust amount
        // In the previous code, routing this dust payment would cause nodes[0] to perceive a channel
        // reserve violation even though it's a dust HTLC and therefore shouldn't count towards the
        // commitment transaction fee.

diff --git a/lightning/src/util/config.rs b/lightning/src/util/config.rs
index 4a9f300638a4c4c3b2ad7d243b58c2f569557841..5e902c17529ef9b4326bc2d1138a2b6ac218918a 100644 (file)
--- a/lightning/src/util/config.rs
+++ b/lightning/src/util/config.rs
@@ -98,22 +98,6 @@ pub struct ChannelHandshakeLimits {
        ///
        /// Default value: 0.
        pub min_max_accepted_htlcs: u16,
-       /// Outputs below a certain value will not be added to on-chain transactions. The dust value is
-       /// required to always be higher than this value so this only applies to HTLC outputs (and
-       /// potentially to-self outputs before any payments have been made).
-       /// Thus, HTLCs below this amount plus HTLC transaction fees are not enforceable on-chain.
-       /// This setting allows you to set a minimum dust limit for their commitment transactions,
-       /// reflecting the reality that tiny outputs are not considered standard transactions and will
-       /// not propagate through the Bitcoin network.
-       ///
-       /// Default value: 546, the current dust limit on the Bitcoin network.
-       pub min_dust_limit_satoshis: u64,
-       /// Maximum allowed threshold above which outputs will not be generated in their commitment
-       /// transactions.
-       /// HTLCs below this amount plus HTLC transaction fees are not enforceable on-chain.
-       ///
-       /// Default value: u64::max_value.
-       pub max_dust_limit_satoshis: u64,
        /// Before a channel is usable the funding transaction will need to be confirmed by at least a
        /// certain number of blocks, specified by the node which is not the funder (as the funder can
        /// assume they aren't going to double-spend themselves).
@@ -145,8 +129,6 @@ impl Default for ChannelHandshakeLimits {
                        min_max_htlc_value_in_flight_msat: 0,
                        max_channel_reserve_satoshis: <u64>::max_value(),
                        min_max_accepted_htlcs: 0,
-                       min_dust_limit_satoshis: 546,
-                       max_dust_limit_satoshis: <u64>::max_value(),
                        max_minimum_depth: 144,
                        force_announced_channel_preference: true,
                        their_to_self_delay: MAX_LOCAL_BREAKDOWN_TIMEOUT,