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Increase our default/minimum dust limit to 354 sat/vbytes

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330 sat/vbyte, the current value, is not sufficient to ensure a
future segwit script longer than 32 bytes meets the dust limit if
used for a shutdown script. Thus, we can either check the value
on shutdown or we can simply require segwit outputs and require a
dust value of no less than 354 sat/vbyte.

We swap the minimum dust value to 354 sat/vbyte here, requiring
segwit scripts in a future commit.

See https://github.com/lightningnetwork/lightning-rfc/issues/905
This commit is contained in:
Matt Corallo 2021-08-31 23:22:14 +00:00
parent 57f54bcc11
commit 8fad498900
2 changed files with 11 additions and 8 deletions
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6
fuzz/src/full_stack.rs
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13
lightning/src/ln/channel.rs
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@ -565,11 +565,14 @@ pub const MAX_FUNDING_SATOSHIS: u64 = 1 << 24;
/// 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;
/// The dust limit is used for both the commitment transaction outputs as well as the closing
/// transactions. For cooperative closing transactions, we require segwit outputs, though accept
/// *any* segwit scripts, which are allowed to be up to 42 bytes in length.
/// In order to avoid having to concern ourselves with standardness during the closing process, we
/// simply require our counterparty to use a dust limit which will leave any segwit output
/// standard.
/// See https://github.com/lightningnetwork/lightning-rfc/issues/905 for more details.
pub const MIN_DUST_LIMIT_SATOSHIS: u64 = 354;
/// 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