Define option_anchors_zero_fee_htlc_tx feature bit

diff --git a/lightning/src/ln/features.rs b/lightning/src/ln/features.rs
index a3c1b7f623d1f2a355516638e75432e61a04fa71..082890557d3fdbf20af0f22509258628fb6e6771 100644 (file)
--- a/lightning/src/ln/features.rs
+++ b/lightning/src/ln/features.rs
@@ -52,6 +52,10 @@
 //!     (see [BOLT-2](https://github.com/lightning/bolts/blob/master/02-peer-protocol.md) for more information).
 //! - `Keysend` - send funds to a node without an invoice
 //!     (see the [`Keysend` feature assignment proposal](https://github.com/lightning/bolts/issues/605#issuecomment-606679798) for more information).
+//! - `AnchorsZeroFeeHtlcTx` - requires/supports that commitment transactions include anchor outputs
+//!   and HTLC transactions are pre-signed with zero fee (see
+//!   [BOLT-3](https://github.com/lightning/bolts/blob/master/03-transactions.md) for more
+//!   information).
 //!
 //! [BOLT #9]: https://github.com/lightning/bolts/blob/master/09-features.md
 //! [messages]: crate::ln::msgs
@@ -122,7 +126,7 @@ mod sealed {
                // Byte 1
                VariableLengthOnion | StaticRemoteKey | PaymentSecret,
                // Byte 2
-               BasicMPP | Wumbo,
+               BasicMPP | Wumbo | AnchorsZeroFeeHtlcTx,
                // Byte 3
                ShutdownAnySegwit,
                // Byte 4
@@ -138,7 +142,7 @@ mod sealed {
                // Byte 1
                VariableLengthOnion | StaticRemoteKey | PaymentSecret,
                // Byte 2
-               BasicMPP | Wumbo,
+               BasicMPP | Wumbo | AnchorsZeroFeeHtlcTx,
                // Byte 3
                ShutdownAnySegwit,
                // Byte 4
@@ -176,7 +180,7 @@ mod sealed {
                // Byte 1
                StaticRemoteKey,
                // Byte 2
-               ,
+               AnchorsZeroFeeHtlcTx,
                // Byte 3
                ,
                // Byte 4
@@ -357,6 +361,9 @@ mod sealed {
        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!(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);
        define_feature!(27, ShutdownAnySegwit, [InitContext, NodeContext],
                "Feature flags for `opt_shutdown_anysegwit`.", set_shutdown_any_segwit_optional,
                set_shutdown_any_segwit_required, supports_shutdown_anysegwit, requires_shutdown_anysegwit);
@@ -826,7 +833,7 @@ mod tests {
                        assert_eq!(node_features.flags.len(), 7);
                        assert_eq!(node_features.flags[0], 0b00000010);
                        assert_eq!(node_features.flags[1], 0b01010001);
-                       assert_eq!(node_features.flags[2], 0b00001010);
+                       assert_eq!(node_features.flags[2], 0b10001010);
                        assert_eq!(node_features.flags[3], 0b00001000);
                        assert_eq!(node_features.flags[4], 0b10000000);
                        assert_eq!(node_features.flags[5], 0b10100000);