Add message structs required for dual-funded channels
[rust-lightning] / lightning / src / ln / channel.rs
index 2d8577e98cf8ba3242f8b49f474c2147e71c8394..3a324e6f4d8856197e8351ef675809aa48a71825 100644 (file)
@@ -25,7 +25,7 @@ use bitcoin::secp256k1;
 use crate::ln::{PaymentPreimage, PaymentHash};
 use crate::ln::features::{ChannelTypeFeatures, InitFeatures};
 use crate::ln::msgs;
-use crate::ln::msgs::{DecodeError, OptionalField, DataLossProtect};
+use crate::ln::msgs::DecodeError;
 use crate::ln::script::{self, ShutdownScript};
 use crate::ln::channelmanager::{self, CounterpartyForwardingInfo, PendingHTLCStatus, HTLCSource, SentHTLCId, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA, MAX_LOCAL_BREAKDOWN_TIMEOUT};
 use crate::ln::chan_utils::{CounterpartyCommitmentSecrets, TxCreationKeys, HTLCOutputInCommitment, htlc_success_tx_weight, htlc_timeout_tx_weight, make_funding_redeemscript, ChannelPublicKeys, CommitmentTransaction, HolderCommitmentTransaction, ChannelTransactionParameters, CounterpartyChannelTransactionParameters, MAX_HTLCS, get_commitment_transaction_number_obscure_factor, ClosingTransaction};
@@ -35,7 +35,7 @@ use crate::chain::BestBlock;
 use crate::chain::chaininterface::{FeeEstimator, ConfirmationTarget, LowerBoundedFeeEstimator};
 use crate::chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, LATENCY_GRACE_PERIOD_BLOCKS, CLOSED_CHANNEL_UPDATE_ID};
 use crate::chain::transaction::{OutPoint, TransactionData};
-use crate::chain::keysinterface::{WriteableEcdsaChannelSigner, EntropySource, ChannelSigner, SignerProvider, NodeSigner, Recipient};
+use crate::sign::{WriteableEcdsaChannelSigner, EntropySource, ChannelSigner, SignerProvider, NodeSigner, Recipient};
 use crate::events::ClosureReason;
 use crate::routing::gossip::NodeId;
 use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer, VecWriter};
@@ -312,9 +312,9 @@ pub(super) enum ChannelUpdateStatus {
        /// We've announced the channel as enabled and are connected to our peer.
        Enabled,
        /// Our channel is no longer live, but we haven't announced the channel as disabled yet.
-       DisabledStaged,
+       DisabledStaged(u8),
        /// Our channel is live again, but we haven't announced the channel as enabled yet.
-       EnabledStaged,
+       EnabledStaged(u8),
        /// We've announced the channel as disabled.
        Disabled,
 }
@@ -653,7 +653,7 @@ pub(super) struct Channel<Signer: ChannelSigner> {
        pub counterparty_max_accepted_htlcs: u16,
        #[cfg(not(test))]
        counterparty_max_accepted_htlcs: u16,
-       //implied by OUR_MAX_HTLCS: max_accepted_htlcs: u16,
+       holder_max_accepted_htlcs: u16,
        minimum_depth: Option<u32>,
 
        counterparty_forwarding_info: Option<CounterpartyForwardingInfo>,
@@ -756,7 +756,7 @@ struct CommitmentTxInfoCached {
        feerate: u32,
 }
 
-pub const OUR_MAX_HTLCS: u16 = 50; //TODO
+pub const DEFAULT_MAX_HTLCS: u16 = 50;
 
 pub(crate) fn commitment_tx_base_weight(opt_anchors: bool) -> u64 {
        const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
@@ -986,7 +986,10 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                secp_ctx.seeded_randomize(&entropy_source.get_secure_random_bytes());
 
                let shutdown_scriptpubkey = if config.channel_handshake_config.commit_upfront_shutdown_pubkey {
-                       Some(signer_provider.get_shutdown_scriptpubkey())
+                       match signer_provider.get_shutdown_scriptpubkey() {
+                               Ok(scriptpubkey) => Some(scriptpubkey),
+                               Err(_) => return Err(APIError::ChannelUnavailable { err: "Failed to get shutdown scriptpubkey".to_owned()}),
+                       }
                } else { None };
 
                if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
@@ -995,6 +998,11 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        }
                }
 
+               let destination_script = match signer_provider.get_destination_script() {
+                       Ok(script) => script,
+                       Err(_) => return Err(APIError::ChannelUnavailable { err: "Failed to get destination script".to_owned()}),
+               };
+
                let temporary_channel_id = entropy_source.get_secure_random_bytes();
 
                Ok(Channel {
@@ -1021,7 +1029,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
 
                        holder_signer,
                        shutdown_scriptpubkey,
-                       destination_script: signer_provider.get_destination_script(),
+                       destination_script,
 
                        cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
                        cur_counterparty_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
@@ -1072,6 +1080,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        counterparty_htlc_minimum_msat: 0,
                        holder_htlc_minimum_msat: if config.channel_handshake_config.our_htlc_minimum_msat == 0 { 1 } else { config.channel_handshake_config.our_htlc_minimum_msat },
                        counterparty_max_accepted_htlcs: 0,
+                       holder_max_accepted_htlcs: cmp::min(config.channel_handshake_config.our_max_accepted_htlcs, MAX_HTLCS),
                        minimum_depth: None, // Filled in in accept_channel
 
                        counterparty_forwarding_info: None,
@@ -1313,7 +1322,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
 
                let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
                        match &msg.shutdown_scriptpubkey {
-                               &OptionalField::Present(ref script) => {
+                               &Some(ref script) => {
                                        // Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
                                        if script.len() == 0 {
                                                None
@@ -1325,14 +1334,17 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                                        }
                                },
                                // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel
-                               &OptionalField::Absent => {
+                               &None => {
                                        return Err(ChannelError::Close("Peer is signaling upfront_shutdown but we don't get any script. Use 0-length script to opt-out".to_owned()));
                                }
                        }
                } else { None };
 
                let shutdown_scriptpubkey = if config.channel_handshake_config.commit_upfront_shutdown_pubkey {
-                       Some(signer_provider.get_shutdown_scriptpubkey())
+                       match signer_provider.get_shutdown_scriptpubkey() {
+                               Ok(scriptpubkey) => Some(scriptpubkey),
+                               Err(_) => return Err(ChannelError::Close("Failed to get upfront shutdown scriptpubkey".to_owned())),
+                       }
                } else { None };
 
                if let Some(shutdown_scriptpubkey) = &shutdown_scriptpubkey {
@@ -1341,6 +1353,11 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        }
                }
 
+               let destination_script = match signer_provider.get_destination_script() {
+                       Ok(script) => script,
+                       Err(_) => return Err(ChannelError::Close("Failed to get destination script".to_owned())),
+               };
+
                let mut secp_ctx = Secp256k1::new();
                secp_ctx.seeded_randomize(&entropy_source.get_secure_random_bytes());
 
@@ -1367,7 +1384,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
 
                        holder_signer,
                        shutdown_scriptpubkey,
-                       destination_script: signer_provider.get_destination_script(),
+                       destination_script,
 
                        cur_holder_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
                        cur_counterparty_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
@@ -1419,6 +1436,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        counterparty_htlc_minimum_msat: msg.htlc_minimum_msat,
                        holder_htlc_minimum_msat: if config.channel_handshake_config.our_htlc_minimum_msat == 0 { 1 } else { config.channel_handshake_config.our_htlc_minimum_msat },
                        counterparty_max_accepted_htlcs: msg.max_accepted_htlcs,
+                       holder_max_accepted_htlcs: cmp::min(config.channel_handshake_config.our_max_accepted_htlcs, MAX_HTLCS),
                        minimum_depth: Some(cmp::max(config.channel_handshake_config.minimum_depth, 1)),
 
                        counterparty_forwarding_info: None,
@@ -2189,7 +2207,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
 
                let counterparty_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
                        match &msg.shutdown_scriptpubkey {
-                               &OptionalField::Present(ref script) => {
+                               &Some(ref script) => {
                                        // Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
                                        if script.len() == 0 {
                                                None
@@ -2201,7 +2219,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                                        }
                                },
                                // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel
-                               &OptionalField::Absent => {
+                               &None => {
                                        return Err(ChannelError::Close("Peer is signaling upfront_shutdown but we don't get any script. Use 0-length script to opt-out".to_owned()));
                                }
                        }
@@ -2874,8 +2892,8 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
 
                let inbound_stats = self.get_inbound_pending_htlc_stats(None);
                let outbound_stats = self.get_outbound_pending_htlc_stats(None);
-               if inbound_stats.pending_htlcs + 1 > OUR_MAX_HTLCS as u32 {
-                       return Err(ChannelError::Close(format!("Remote tried to push more than our max accepted HTLCs ({})", OUR_MAX_HTLCS)));
+               if inbound_stats.pending_htlcs + 1 > self.holder_max_accepted_htlcs as u32 {
+                       return Err(ChannelError::Close(format!("Remote tried to push more than our max accepted HTLCs ({})", self.holder_max_accepted_htlcs)));
                }
                if inbound_stats.pending_htlcs_value_msat + msg.amount_msat > self.holder_max_htlc_value_in_flight_msat {
                        return Err(ChannelError::Close(format!("Remote HTLC add would put them over our max HTLC value ({})", self.holder_max_htlc_value_in_flight_msat)));
@@ -4041,32 +4059,27 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                }
 
                if msg.next_remote_commitment_number > 0 {
-                       match msg.data_loss_protect {
-                               OptionalField::Present(ref data_loss) => {
-                                       let expected_point = self.holder_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1, &self.secp_ctx);
-                                       let given_secret = SecretKey::from_slice(&data_loss.your_last_per_commitment_secret)
-                                               .map_err(|_| ChannelError::Close("Peer sent a garbage channel_reestablish with unparseable secret key".to_owned()))?;
-                                       if expected_point != PublicKey::from_secret_key(&self.secp_ctx, &given_secret) {
-                                               return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided".to_owned()));
+                       let expected_point = self.holder_signer.get_per_commitment_point(INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1, &self.secp_ctx);
+                       let given_secret = SecretKey::from_slice(&msg.your_last_per_commitment_secret)
+                               .map_err(|_| ChannelError::Close("Peer sent a garbage channel_reestablish with unparseable secret key".to_owned()))?;
+                       if expected_point != PublicKey::from_secret_key(&self.secp_ctx, &given_secret) {
+                               return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided".to_owned()));
+                       }
+                       if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number {
+                               macro_rules! log_and_panic {
+                                       ($err_msg: expr) => {
+                                               log_error!(logger, $err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
+                                               panic!($err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
                                        }
-                                       if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.cur_holder_commitment_transaction_number {
-                                               macro_rules! log_and_panic {
-                                                       ($err_msg: expr) => {
-                                                               log_error!(logger, $err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
-                                                               panic!($err_msg, log_bytes!(self.channel_id), log_pubkey!(self.counterparty_node_id));
-                                                       }
-                                               }
-                                               log_and_panic!("We have fallen behind - we have received proof that if we broadcast our counterparty is going to claim all our funds.\n\
-                                                       This implies you have restarted with lost ChannelMonitor and ChannelManager state, the first of which is a violation of the LDK chain::Watch requirements.\n\
-                                                       More specifically, this means you have a bug in your implementation that can cause loss of funds, or you are running with an old backup, which is unsafe.\n\
-                                                       If you have restored from an old backup and wish to force-close channels and return to operation, you should start up, call\n\
-                                                       ChannelManager::force_close_without_broadcasting_txn on channel {} with counterparty {} or\n\
-                                                       ChannelManager::force_close_all_channels_without_broadcasting_txn, then reconnect to peer(s).\n\
-                                                       Note that due to a long-standing bug in lnd you may have to reach out to peers running lnd-based nodes to ask them to manually force-close channels\n\
-                                                       See https://github.com/lightningdevkit/rust-lightning/issues/1565 for more info.");
-                                       }
-                               },
-                               OptionalField::Absent => {}
+                               }
+                               log_and_panic!("We have fallen behind - we have received proof that if we broadcast our counterparty is going to claim all our funds.\n\
+                                       This implies you have restarted with lost ChannelMonitor and ChannelManager state, the first of which is a violation of the LDK chain::Watch requirements.\n\
+                                       More specifically, this means you have a bug in your implementation that can cause loss of funds, or you are running with an old backup, which is unsafe.\n\
+                                       If you have restored from an old backup and wish to force-close channels and return to operation, you should start up, call\n\
+                                       ChannelManager::force_close_without_broadcasting_txn on channel {} with counterparty {} or\n\
+                                       ChannelManager::force_close_all_channels_without_broadcasting_txn, then reconnect to peer(s).\n\
+                                       Note that due to a long-standing bug in lnd you may have to reach out to peers running lnd-based nodes to ask them to manually force-close channels\n\
+                                       See https://github.com/lightningdevkit/rust-lightning/issues/1565 for more info.");
                        }
                }
 
@@ -4353,7 +4366,10 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        Some(_) => false,
                        None => {
                                assert!(send_shutdown);
-                               let shutdown_scriptpubkey = signer_provider.get_shutdown_scriptpubkey();
+                               let shutdown_scriptpubkey = match signer_provider.get_shutdown_scriptpubkey() {
+                                       Ok(scriptpubkey) => scriptpubkey,
+                                       Err(_) => return Err(ChannelError::Close("Failed to get shutdown scriptpubkey".to_owned())),
+                               };
                                if !shutdown_scriptpubkey.is_compatible(their_features) {
                                        return Err(ChannelError::Close(format!("Provided a scriptpubkey format not accepted by peer: {}", shutdown_scriptpubkey)));
                                }
@@ -5313,7 +5329,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        htlc_minimum_msat: self.holder_htlc_minimum_msat,
                        feerate_per_kw: self.feerate_per_kw as u32,
                        to_self_delay: self.get_holder_selected_contest_delay(),
-                       max_accepted_htlcs: OUR_MAX_HTLCS,
+                       max_accepted_htlcs: self.holder_max_accepted_htlcs,
                        funding_pubkey: keys.funding_pubkey,
                        revocation_basepoint: keys.revocation_basepoint,
                        payment_point: keys.payment_point,
@@ -5321,7 +5337,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        htlc_basepoint: keys.htlc_basepoint,
                        first_per_commitment_point,
                        channel_flags: if self.config.announced_channel {1} else {0},
-                       shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
+                       shutdown_scriptpubkey: Some(match &self.shutdown_scriptpubkey {
                                Some(script) => script.clone().into_inner(),
                                None => Builder::new().into_script(),
                        }),
@@ -5380,14 +5396,14 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        htlc_minimum_msat: self.holder_htlc_minimum_msat,
                        minimum_depth: self.minimum_depth.unwrap(),
                        to_self_delay: self.get_holder_selected_contest_delay(),
-                       max_accepted_htlcs: OUR_MAX_HTLCS,
+                       max_accepted_htlcs: self.holder_max_accepted_htlcs,
                        funding_pubkey: keys.funding_pubkey,
                        revocation_basepoint: keys.revocation_basepoint,
                        payment_point: keys.payment_point,
                        delayed_payment_basepoint: keys.delayed_payment_basepoint,
                        htlc_basepoint: keys.htlc_basepoint,
                        first_per_commitment_point,
-                       shutdown_scriptpubkey: OptionalField::Present(match &self.shutdown_scriptpubkey {
+                       shutdown_scriptpubkey: Some(match &self.shutdown_scriptpubkey {
                                Some(script) => script.clone().into_inner(),
                                None => Builder::new().into_script(),
                        }),
@@ -5649,19 +5665,13 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                // valid, and valid in fuzzing mode's arbitrary validity criteria:
                let mut pk = [2; 33]; pk[1] = 0xff;
                let dummy_pubkey = PublicKey::from_slice(&pk).unwrap();
-               let data_loss_protect = if self.cur_counterparty_commitment_transaction_number + 1 < INITIAL_COMMITMENT_NUMBER {
+               let remote_last_secret = if self.cur_counterparty_commitment_transaction_number + 1 < INITIAL_COMMITMENT_NUMBER {
                        let remote_last_secret = self.commitment_secrets.get_secret(self.cur_counterparty_commitment_transaction_number + 2).unwrap();
                        log_trace!(logger, "Enough info to generate a Data Loss Protect with per_commitment_secret {} for channel {}", log_bytes!(remote_last_secret), log_bytes!(self.channel_id()));
-                       OptionalField::Present(DataLossProtect {
-                               your_last_per_commitment_secret: remote_last_secret,
-                               my_current_per_commitment_point: dummy_pubkey
-                       })
+                       remote_last_secret
                } else {
                        log_info!(logger, "Sending a data_loss_protect with no previous remote per_commitment_secret for channel {}", log_bytes!(self.channel_id()));
-                       OptionalField::Present(DataLossProtect {
-                               your_last_per_commitment_secret: [0;32],
-                               my_current_per_commitment_point: dummy_pubkey,
-                       })
+                       [0;32]
                };
                msgs::ChannelReestablish {
                        channel_id: self.channel_id(),
@@ -5683,7 +5693,11 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                        // dropped this channel on disconnect as it hasn't yet reached FundingSent so we can't
                        // overflow here.
                        next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_counterparty_commitment_transaction_number - 1,
-                       data_loss_protect,
+                       your_last_per_commitment_secret: remote_last_secret,
+                       my_current_per_commitment_point: dummy_pubkey,
+                       // TODO(dual_funding): If we've sent `commtiment_signed` for an interactive transaction construction but have not received `tx_signatures`
+                       // we MUST set `next_funding_txid` to the txid of that interactive transaction, else we MUST NOT set it.
+                       next_funding_txid: None,
                }
        }
 
@@ -6029,7 +6043,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
        /// May jump to the channel being fully shutdown (see [`Self::is_shutdown`]) in which case no
        /// [`ChannelMonitorUpdate`] will be returned).
        pub fn get_shutdown<SP: Deref>(&mut self, signer_provider: &SP, their_features: &InitFeatures,
-               target_feerate_sats_per_kw: Option<u32>)
+               target_feerate_sats_per_kw: Option<u32>, override_shutdown_script: Option<ShutdownScript>)
        -> Result<(msgs::Shutdown, Option<&ChannelMonitorUpdate>, Vec<(HTLCSource, PaymentHash)>), APIError>
        where SP::Target: SignerProvider {
                for htlc in self.pending_outbound_htlcs.iter() {
@@ -6045,6 +6059,9 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                                return Err(APIError::ChannelUnavailable{err: "Shutdown already in progress by remote".to_owned()});
                        }
                }
+               if self.shutdown_scriptpubkey.is_some() && override_shutdown_script.is_some() {
+                       return Err(APIError::APIMisuseError{err: "Cannot override shutdown script for a channel with one already set".to_owned()});
+               }
                assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
                if self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateInProgress as u32) != 0 {
                        return Err(APIError::ChannelUnavailable{err: "Cannot begin shutdown while peer is disconnected or we're waiting on a monitor update, maybe force-close instead?".to_owned()});
@@ -6060,7 +6077,17 @@ impl<Signer: WriteableEcdsaChannelSigner> Channel<Signer> {
                let update_shutdown_script = match self.shutdown_scriptpubkey {
                        Some(_) => false,
                        None if !chan_closed => {
-                               let shutdown_scriptpubkey = signer_provider.get_shutdown_scriptpubkey();
+                               // use override shutdown script if provided
+                               let shutdown_scriptpubkey = match override_shutdown_script {
+                                       Some(script) => script,
+                                       None => {
+                                               // otherwise, use the shutdown scriptpubkey provided by the signer
+                                               match signer_provider.get_shutdown_scriptpubkey() {
+                                                       Ok(scriptpubkey) => scriptpubkey,
+                                                       Err(_) => return Err(APIError::ChannelUnavailable{err: "Failed to get shutdown scriptpubkey".to_owned()}),
+                                               }
+                                       },
+                               };
                                if !shutdown_scriptpubkey.is_compatible(their_features) {
                                        return Err(APIError::IncompatibleShutdownScript { script: shutdown_scriptpubkey.clone() });
                                }
@@ -6191,8 +6218,8 @@ impl Writeable for ChannelUpdateStatus {
                // channel as enabled, so we write 0. For EnabledStaged, we similarly write a 1.
                match self {
                        ChannelUpdateStatus::Enabled => 0u8.write(writer)?,
-                       ChannelUpdateStatus::DisabledStaged => 0u8.write(writer)?,
-                       ChannelUpdateStatus::EnabledStaged => 1u8.write(writer)?,
+                       ChannelUpdateStatus::DisabledStaged(_) => 0u8.write(writer)?,
+                       ChannelUpdateStatus::EnabledStaged(_) => 1u8.write(writer)?,
                        ChannelUpdateStatus::Disabled => 1u8.write(writer)?,
                }
                Ok(())
@@ -6496,6 +6523,8 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
                // we write the high bytes as an option here.
                let user_id_high_opt = Some((self.user_id >> 64) as u64);
 
+               let holder_max_accepted_htlcs = if self.holder_max_accepted_htlcs == DEFAULT_MAX_HTLCS { None } else { Some(self.holder_max_accepted_htlcs) };
+
                write_tlv_fields!(writer, {
                        (0, self.announcement_sigs, option),
                        // minimum_depth and counterparty_selected_channel_reserve_satoshis used to have a
@@ -6521,6 +6550,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
                        (23, channel_ready_event_emitted, option),
                        (25, user_id_high_opt, option),
                        (27, self.channel_keys_id, required),
+                       (28, holder_max_accepted_htlcs, option),
                        (29, self.temporary_channel_id, option),
                        (31, channel_pending_event_emitted, option),
                });
@@ -6589,7 +6619,8 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                let value_to_self_msat = Readable::read(reader)?;
 
                let pending_inbound_htlc_count: u64 = Readable::read(reader)?;
-               let mut pending_inbound_htlcs = Vec::with_capacity(cmp::min(pending_inbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
+
+               let mut pending_inbound_htlcs = Vec::with_capacity(cmp::min(pending_inbound_htlc_count as usize, DEFAULT_MAX_HTLCS as usize));
                for _ in 0..pending_inbound_htlc_count {
                        pending_inbound_htlcs.push(InboundHTLCOutput {
                                htlc_id: Readable::read(reader)?,
@@ -6607,7 +6638,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                }
 
                let pending_outbound_htlc_count: u64 = Readable::read(reader)?;
-               let mut pending_outbound_htlcs = Vec::with_capacity(cmp::min(pending_outbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
+               let mut pending_outbound_htlcs = Vec::with_capacity(cmp::min(pending_outbound_htlc_count as usize, DEFAULT_MAX_HTLCS as usize));
                for _ in 0..pending_outbound_htlc_count {
                        pending_outbound_htlcs.push(OutboundHTLCOutput {
                                htlc_id: Readable::read(reader)?,
@@ -6636,7 +6667,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                }
 
                let holding_cell_htlc_update_count: u64 = Readable::read(reader)?;
-               let mut holding_cell_htlc_updates = Vec::with_capacity(cmp::min(holding_cell_htlc_update_count as usize, OUR_MAX_HTLCS as usize*2));
+               let mut holding_cell_htlc_updates = Vec::with_capacity(cmp::min(holding_cell_htlc_update_count as usize, DEFAULT_MAX_HTLCS as usize*2));
                for _ in 0..holding_cell_htlc_update_count {
                        holding_cell_htlc_updates.push(match <u8 as Readable>::read(reader)? {
                                0 => HTLCUpdateAwaitingACK::AddHTLC {
@@ -6669,13 +6700,13 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                let monitor_pending_commitment_signed = Readable::read(reader)?;
 
                let monitor_pending_forwards_count: u64 = Readable::read(reader)?;
-               let mut monitor_pending_forwards = Vec::with_capacity(cmp::min(monitor_pending_forwards_count as usize, OUR_MAX_HTLCS as usize));
+               let mut monitor_pending_forwards = Vec::with_capacity(cmp::min(monitor_pending_forwards_count as usize, DEFAULT_MAX_HTLCS as usize));
                for _ in 0..monitor_pending_forwards_count {
                        monitor_pending_forwards.push((Readable::read(reader)?, Readable::read(reader)?));
                }
 
                let monitor_pending_failures_count: u64 = Readable::read(reader)?;
-               let mut monitor_pending_failures = Vec::with_capacity(cmp::min(monitor_pending_failures_count as usize, OUR_MAX_HTLCS as usize));
+               let mut monitor_pending_failures = Vec::with_capacity(cmp::min(monitor_pending_failures_count as usize, DEFAULT_MAX_HTLCS as usize));
                for _ in 0..monitor_pending_failures_count {
                        monitor_pending_failures.push((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?));
                }
@@ -6796,6 +6827,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                let mut user_id_high_opt: Option<u64> = None;
                let mut channel_keys_id: Option<[u8; 32]> = None;
                let mut temporary_channel_id: Option<[u8; 32]> = None;
+               let mut holder_max_accepted_htlcs: Option<u16> = None;
 
                read_tlv_fields!(reader, {
                        (0, announcement_sigs, option),
@@ -6816,6 +6848,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                        (23, channel_ready_event_emitted, option),
                        (25, user_id_high_opt, option),
                        (27, channel_keys_id, option),
+                       (28, holder_max_accepted_htlcs, option),
                        (29, temporary_channel_id, option),
                        (31, channel_pending_event_emitted, option),
                });
@@ -6870,6 +6903,8 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                // separate u64 values.
                let user_id = user_id_low as u128 + ((user_id_high_opt.unwrap_or(0) as u128) << 64);
 
+               let holder_max_accepted_htlcs = holder_max_accepted_htlcs.unwrap_or(DEFAULT_MAX_HTLCS);
+
                Ok(Channel {
                        user_id,
 
@@ -6898,6 +6933,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
                        cur_counterparty_commitment_transaction_number,
                        value_to_self_msat,
 
+                       holder_max_accepted_htlcs,
                        pending_inbound_htlcs,
                        pending_outbound_htlcs,
                        holding_cell_htlc_updates,
@@ -7005,14 +7041,15 @@ mod tests {
        use crate::ln::channel::{Channel, InboundHTLCOutput, OutboundHTLCOutput, InboundHTLCState, OutboundHTLCState, HTLCCandidate, HTLCInitiator};
        use crate::ln::channel::{MAX_FUNDING_SATOSHIS_NO_WUMBO, TOTAL_BITCOIN_SUPPLY_SATOSHIS, MIN_THEIR_CHAN_RESERVE_SATOSHIS};
        use crate::ln::features::ChannelTypeFeatures;
-       use crate::ln::msgs::{ChannelUpdate, DataLossProtect, DecodeError, OptionalField, UnsignedChannelUpdate, MAX_VALUE_MSAT};
+       use crate::ln::msgs::{ChannelUpdate, DecodeError, UnsignedChannelUpdate, MAX_VALUE_MSAT};
        use crate::ln::script::ShutdownScript;
        use crate::ln::chan_utils;
        use crate::ln::chan_utils::{htlc_success_tx_weight, htlc_timeout_tx_weight};
        use crate::chain::BestBlock;
        use crate::chain::chaininterface::{FeeEstimator, LowerBoundedFeeEstimator, ConfirmationTarget};
-       use crate::chain::keysinterface::{ChannelSigner, InMemorySigner, EntropySource, SignerProvider};
+       use crate::sign::{ChannelSigner, InMemorySigner, EntropySource, SignerProvider};
        use crate::chain::transaction::OutPoint;
+       use crate::routing::router::Path;
        use crate::util::config::UserConfig;
        use crate::util::enforcing_trait_impls::EnforcingSigner;
        use crate::util::errors::APIError;
@@ -7075,17 +7112,17 @@ mod tests {
 
                fn read_chan_signer(&self, _data: &[u8]) -> Result<Self::Signer, DecodeError> { panic!(); }
 
-               fn get_destination_script(&self) -> Script {
+               fn get_destination_script(&self) -> Result<Script, ()> {
                        let secp_ctx = Secp256k1::signing_only();
                        let channel_monitor_claim_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
                        let channel_monitor_claim_key_hash = WPubkeyHash::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
-                       Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_monitor_claim_key_hash[..]).into_script()
+                       Ok(Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&channel_monitor_claim_key_hash[..]).into_script())
                }
 
-               fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
+               fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> {
                        let secp_ctx = Secp256k1::signing_only();
                        let channel_close_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
-                       ShutdownScript::new_p2wpkh_from_pubkey(PublicKey::from_secret_key(&secp_ctx, &channel_close_key))
+                       Ok(ShutdownScript::new_p2wpkh_from_pubkey(PublicKey::from_secret_key(&secp_ctx, &channel_close_key)))
                }
        }
 
@@ -7190,7 +7227,7 @@ mod tests {
                        cltv_expiry: 200000000,
                        state: OutboundHTLCState::Committed,
                        source: HTLCSource::OutboundRoute {
-                               path: Vec::new(),
+                               path: Path { hops: Vec::new(), blinded_tail: None },
                                session_priv: SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
                                first_hop_htlc_msat: 548,
                                payment_id: PaymentId([42; 32]),
@@ -7305,12 +7342,7 @@ mod tests {
                let msg = node_b_chan.get_channel_reestablish(&&logger);
                assert_eq!(msg.next_local_commitment_number, 1); // now called next_commitment_number
                assert_eq!(msg.next_remote_commitment_number, 0); // now called next_revocation_number
-               match msg.data_loss_protect {
-                       OptionalField::Present(DataLossProtect { your_last_per_commitment_secret, .. }) => {
-                               assert_eq!(your_last_per_commitment_secret, [0; 32]);
-                       },
-                       _ => panic!()
-               }
+               assert_eq!(msg.your_last_per_commitment_secret, [0; 32]);
 
                // Check that the commitment point in Node A's channel_reestablish message
                // is sane.
@@ -7318,12 +7350,7 @@ mod tests {
                let msg = node_a_chan.get_channel_reestablish(&&logger);
                assert_eq!(msg.next_local_commitment_number, 1); // now called next_commitment_number
                assert_eq!(msg.next_remote_commitment_number, 0); // now called next_revocation_number
-               match msg.data_loss_protect {
-                       OptionalField::Present(DataLossProtect { your_last_per_commitment_secret, .. }) => {
-                               assert_eq!(your_last_per_commitment_secret, [0; 32]);
-                       },
-                       _ => panic!()
-               }
+               assert_eq!(msg.your_last_per_commitment_secret, [0; 32]);
        }
 
        #[test]
@@ -7505,7 +7532,7 @@ mod tests {
                }
        }
 
-       #[cfg(not(feature = "grind_signatures"))]
+       #[cfg(feature = "_test_vectors")]
        #[test]
        fn outbound_commitment_test() {
                use bitcoin::util::sighash;
@@ -7514,7 +7541,7 @@ mod tests {
                use bitcoin::hashes::hex::FromHex;
                use bitcoin::hash_types::Txid;
                use bitcoin::secp256k1::Message;
-               use crate::chain::keysinterface::EcdsaChannelSigner;
+               use crate::sign::EcdsaChannelSigner;
                use crate::ln::PaymentPreimage;
                use crate::ln::channel::{HTLCOutputInCommitment ,TxCreationKeys};
                use crate::ln::chan_utils::{ChannelPublicKeys, HolderCommitmentTransaction, CounterpartyChannelTransactionParameters};
@@ -7538,6 +7565,7 @@ mod tests {
                        [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff],
                        10_000_000,
                        [0; 32],
+                       [0; 32],
                );
 
                assert_eq!(signer.pubkeys().funding_pubkey.serialize()[..],