//! [BOLT-3](https://github.com/lightning/bolts/blob/master/03-transactions.md) for more
//! information).
//!
+//! LDK knows about the following features, but does not support them:
+//! - `AnchorsNonzeroFeeHtlcTx` - the initial version of anchor outputs, which was later found to be
+//! vulnerable (see this
+//! [mailing list post](https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-September/002796.html)
+//! for more information).
+//!
//! [BOLT #9]: https://github.com/lightning/bolts/blob/master/09-features.md
//! [messages]: crate::ln::msgs
use crate::{io, io_extras};
use crate::prelude::*;
use core::{cmp, fmt};
+use core::borrow::Borrow;
use core::hash::{Hash, Hasher};
use core::marker::PhantomData;
// Byte 1
VariableLengthOnion | StaticRemoteKey | PaymentSecret,
// Byte 2
- BasicMPP | Wumbo | AnchorsZeroFeeHtlcTx,
+ BasicMPP | Wumbo | AnchorsNonzeroFeeHtlcTx | AnchorsZeroFeeHtlcTx,
// Byte 3
ShutdownAnySegwit,
// Byte 4
// Byte 1
VariableLengthOnion | StaticRemoteKey | PaymentSecret,
// Byte 2
- BasicMPP | Wumbo | AnchorsZeroFeeHtlcTx,
+ BasicMPP | Wumbo | AnchorsNonzeroFeeHtlcTx | AnchorsZeroFeeHtlcTx,
// Byte 3
ShutdownAnySegwit,
// Byte 4
// Byte 1
StaticRemoteKey,
// Byte 2
- AnchorsZeroFeeHtlcTx,
+ AnchorsNonzeroFeeHtlcTx | AnchorsZeroFeeHtlcTx,
// Byte 3
,
// Byte 4
define_feature!(19, Wumbo, [InitContext, NodeContext],
"Feature flags for `option_support_large_channel` (aka wumbo channels).", set_wumbo_optional, set_wumbo_required,
supports_wumbo, requires_wumbo);
+ define_feature!(21, AnchorsNonzeroFeeHtlcTx, [InitContext, NodeContext, ChannelTypeContext],
+ "Feature flags for `option_anchors_nonzero_fee_htlc_tx`.", set_anchors_nonzero_fee_htlc_tx_optional,
+ set_anchors_nonzero_fee_htlc_tx_required, supports_anchors_nonzero_fee_htlc_tx, requires_anchors_nonzero_fee_htlc_tx);
define_feature!(23, AnchorsZeroFeeHtlcTx, [InitContext, NodeContext, ChannelTypeContext],
"Feature flags for `option_anchors_zero_fee_htlc_tx`.", set_anchors_zero_fee_htlc_tx_optional,
set_anchors_zero_fee_htlc_tx_required, supports_anchors_zero_fee_htlc_tx, requires_anchors_zero_fee_htlc_tx);
mark: PhantomData<T>,
}
+impl<T: sealed::Context, Rhs: Borrow<Self>> core::ops::BitOrAssign<Rhs> for Features<T> {
+ fn bitor_assign(&mut self, rhs: Rhs) {
+ let total_feature_len = cmp::max(self.flags.len(), rhs.borrow().flags.len());
+ self.flags.resize(total_feature_len, 0u8);
+ for (byte, rhs_byte) in self.flags.iter_mut().zip(rhs.borrow().flags.iter()) {
+ *byte |= *rhs_byte;
+ }
+ }
+}
+
impl<T: sealed::Context> core::ops::BitOr for Features<T> {
type Output = Self;
fn bitor(mut self, o: Self) -> Self {
- let total_feature_len = cmp::max(self.flags.len(), o.flags.len());
- self.flags.resize(total_feature_len, 0u8);
- for (byte, o_byte) in self.flags.iter_mut().zip(o.flags.iter()) {
- *byte |= *o_byte;
- }
+ self |= o;
self
}
}
self.flags.eq(&o.flags)
}
}
+impl<T: sealed::Context> PartialOrd for Features<T> {
+ fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
+ self.flags.partial_cmp(&other.flags)
+ }
+}
+impl<T: sealed::Context + Eq> Ord for Features<T> {
+ fn cmp(&self, other: &Self) -> cmp::Ordering {
+ self.flags.cmp(&other.flags)
+ }
+}
impl<T: sealed::Context> fmt::Debug for Features<T> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
self.flags.fmt(fmt)
/// [`PaymentParameters::for_keysend`], thus omitting the need for payers to manually construct an
/// `InvoiceFeatures` for [`find_route`].
///
+ /// MPP keysend is not widely supported yet, so we parameterize support to allow the user to
+ /// choose whether their router should find multi-part routes.
+ ///
/// [`PaymentParameters::for_keysend`]: crate::routing::router::PaymentParameters::for_keysend
/// [`find_route`]: crate::routing::router::find_route
- pub(crate) fn for_keysend() -> InvoiceFeatures {
+ pub(crate) fn for_keysend(allow_mpp: bool) -> InvoiceFeatures {
let mut res = InvoiceFeatures::empty();
res.set_variable_length_onion_optional();
+ if allow_mpp {
+ res.set_basic_mpp_optional();
+ }
res
}
}
+impl Bolt12InvoiceFeatures {
+ /// Converts `Bolt12InvoiceFeatures` to `Features<C>`. Only known `Bolt12InvoiceFeatures` relevant
+ /// to context `C` are included in the result.
+ pub(crate) fn to_context<C: sealed::Context>(&self) -> Features<C> {
+ self.to_context_internal()
+ }
+}
+
impl ChannelTypeFeatures {
// Maps the relevant `InitFeatures` to `ChannelTypeFeatures`. Any unknown features to
// `ChannelTypeFeatures` are not included in the result.
<sealed::ChannelTypeContext as sealed::StaticRemoteKey>::set_required_bit(&mut ret.flags);
ret
}
+
+ /// Constructs a ChannelTypeFeatures with anchors support
+ pub(crate) fn anchors_zero_htlc_fee_and_dependencies() -> Self {
+ let mut ret = Self::empty();
+ <sealed::ChannelTypeContext as sealed::StaticRemoteKey>::set_required_bit(&mut ret.flags);
+ <sealed::ChannelTypeContext as sealed::AnchorsZeroFeeHtlcTx>::set_required_bit(&mut ret.flags);
+ ret
+ }
}
impl ToBase32 for InvoiceFeatures {
impl_feature_len_prefixed_write!(ChannelFeatures);
impl_feature_len_prefixed_write!(NodeFeatures);
impl_feature_len_prefixed_write!(InvoiceFeatures);
+impl_feature_len_prefixed_write!(Bolt12InvoiceFeatures);
impl_feature_len_prefixed_write!(BlindedHopFeatures);
// Some features only appear inside of TLVs, so they don't have a length prefix when serialized.
projects / rust-lightning / blobdiff