From: Antoine Riard Date: Tue, 16 Mar 2021 22:07:22 +0000 (-0400) Subject: Replace config max counterpary `dust_limit_satoshis` by a constant. X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=e45f245448a4034dc1929d949f988189b8daa44b;p=rust-lightning 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 b48604dba..3fd6515fd 100644 --- a/fuzz/src/chanmon_consistency.rs +++ b/fuzz/src/chanmon_consistency.rs @@ -338,7 +338,6 @@ pub fn do_test(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, @@ -358,7 +357,6 @@ pub fn do_test(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 55fae3a85..689252cdf 100644 --- a/fuzz/src/full_stack.rs +++ b/fuzz/src/full_stack.rs @@ -360,7 +360,6 @@ pub fn do_test(data: &[u8], logger: &Arc) { 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, @@ -665,7 +664,7 @@ 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 // @@ -711,12 +710,12 @@ 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 // @@ -903,24 +902,22 @@ 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()) }); - 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&(Arc::clone(&logger) as Arc)); + super::do_test(&::hex::decode("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&(Arc::clone(&logger) as Arc)); 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 @@ -932,6 +929,5 @@ 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 fc59c29d7..413dc8313 100644 --- a/lightning/src/ln/channel.rs +++ b/lightning/src/ln/channel.rs @@ -439,7 +439,6 @@ 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; @@ -454,6 +453,22 @@ 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. @@ -497,10 +512,6 @@ impl Channel { 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(fee_estimator: &F, keys_provider: &K, counterparty_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64, config: &UserConfig) -> Result, APIError> where K::Target: KeysInterface, @@ -520,9 +531,9 @@ impl Channel { 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::::get_holder_selected_channel_reserve_satoshis(channel_value_satoshis) < Channel::::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::::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); @@ -579,7 +590,7 @@ impl Channel { feerate_per_kw: feerate, counterparty_dust_limit_satoshis: 0, - holder_dust_limit_satoshis: Channel::::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, @@ -700,11 +711,11 @@ impl Channel { 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: @@ -720,13 +731,12 @@ impl Channel { let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background); - let holder_dust_limit_satoshis = Channel::::derive_holder_dust_limit_satoshis(background_feerate); let holder_selected_channel_reserve_satoshis = Channel::::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))); @@ -818,7 +828,7 @@ impl Channel { 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, @@ -1442,11 +1452,11 @@ impl Channel { 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))); @@ -4939,7 +4949,6 @@ 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::::new_from_req(&&feeest, &&keys_provider, node_b_node_id, InitFeatures::known(), &open_channel_msg, 7, &config).unwrap(); @@ -4947,6 +4956,7 @@ 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 6d6e0937c..28564ea5e 100644 --- a/lightning/src/ln/functional_tests.rs +++ b/lightning/src/ln/functional_tests.rs @@ -1764,7 +1764,7 @@ 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 de83f227b..4a66fa37a 100644 --- 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: ::max_value(), min_max_accepted_htlcs: 0, - min_dust_limit_satoshis: 546, - max_dust_limit_satoshis: ::max_value(), max_minimum_depth: 144, force_announced_channel_preference: true, their_to_self_delay: MAX_LOCAL_BREAKDOWN_TIMEOUT,