diff --git a/lightning/src/ln/channel.rs b/lightning/src/ln/channel.rs index e533e532f7e..c67b7f695a5 100644 --- a/lightning/src/ln/channel.rs +++ b/lightning/src/ln/channel.rs @@ -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, } @@ -6193,8 +6193,8 @@ 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(()) diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs index 9f403f85b2f..1a0c6f809a0 100644 --- a/lightning/src/ln/channelmanager.rs +++ b/lightning/src/ln/channelmanager.rs @@ -1070,6 +1070,14 @@ pub(crate) const MPP_TIMEOUT_TICKS: u8 = 3; /// [`OutboundPayments::remove_stale_resolved_payments`]. pub(crate) const IDEMPOTENCY_TIMEOUT_TICKS: u8 = 7; +/// The number of ticks of [`ChannelManager::timer_tick_occurred`] where a peer is disconnected +/// until we mark the channel disabled and gossip the update. +pub(crate) const DISABLE_GOSSIP_TICKS: u8 = 10; + +/// The number of ticks of [`ChannelManager::timer_tick_occurred`] where a peer is connected until +/// we mark the channel enabled and gossip the update. +pub(crate) const ENABLE_GOSSIP_TICKS: u8 = 5; + /// The maximum number of unfunded channels we can have per-peer before we start rejecting new /// (inbound) ones. The number of peers with unfunded channels is limited separately in /// [`MAX_UNFUNDED_CHANNEL_PEERS`]. @@ -2457,7 +2465,14 @@ where // hopefully an attacker trying to path-trace payments cannot make this occur // on a small/per-node/per-channel scale. if !chan.is_live() { // channel_disabled - break Some(("Forwarding channel is not in a ready state.", 0x1000 | 20, chan_update_opt)); + // If the channel_update we're going to return is disabled (i.e. the + // peer has been disabled for some time), return `channel_disabled`, + // otherwise return `temporary_channel_failure`. + if chan_update_opt.as_ref().map(|u| u.contents.flags & 2 == 2).unwrap_or(false) { + break Some(("Forwarding channel has been disconnected for some time.", 0x1000 | 20, chan_update_opt)); + } else { + break Some(("Forwarding channel is not in a ready state.", 0x1000 | 7, chan_update_opt)); + } } if *outgoing_amt_msat < chan.get_counterparty_htlc_minimum_msat() { // amount_below_minimum break Some(("HTLC amount was below the htlc_minimum_msat", 0x1000 | 11, chan_update_opt)); @@ -2582,11 +2597,18 @@ where log_trace!(self.logger, "Generating channel update for channel {}", log_bytes!(chan.channel_id())); let were_node_one = self.our_network_pubkey.serialize()[..] < chan.get_counterparty_node_id().serialize()[..]; + let enabled = chan.is_usable() && match chan.channel_update_status() { + ChannelUpdateStatus::Enabled => true, + ChannelUpdateStatus::DisabledStaged(_) => true, + ChannelUpdateStatus::Disabled => false, + ChannelUpdateStatus::EnabledStaged(_) => false, + }; + let unsigned = msgs::UnsignedChannelUpdate { chain_hash: self.genesis_hash, short_channel_id, timestamp: chan.get_update_time_counter(), - flags: (!were_node_one) as u8 | ((!chan.is_live() as u8) << 1), + flags: (!were_node_one) as u8 | ((!enabled as u8) << 1), cltv_expiry_delta: chan.get_cltv_expiry_delta(), htlc_minimum_msat: chan.get_counterparty_htlc_minimum_msat(), htlc_maximum_msat: chan.get_announced_htlc_max_msat(), @@ -3736,27 +3758,39 @@ where } match chan.channel_update_status() { - ChannelUpdateStatus::Enabled if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::DisabledStaged), - ChannelUpdateStatus::Disabled if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::EnabledStaged), - ChannelUpdateStatus::DisabledStaged if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Enabled), - ChannelUpdateStatus::EnabledStaged if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Disabled), - ChannelUpdateStatus::DisabledStaged if !chan.is_live() => { - if let Ok(update) = self.get_channel_update_for_broadcast(&chan) { - pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate { - msg: update - }); + ChannelUpdateStatus::Enabled if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::DisabledStaged(0)), + ChannelUpdateStatus::Disabled if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::EnabledStaged(0)), + ChannelUpdateStatus::DisabledStaged(_) if chan.is_live() + => chan.set_channel_update_status(ChannelUpdateStatus::Enabled), + ChannelUpdateStatus::EnabledStaged(_) if !chan.is_live() + => chan.set_channel_update_status(ChannelUpdateStatus::Disabled), + ChannelUpdateStatus::DisabledStaged(mut n) if !chan.is_live() => { + n += 1; + if n >= DISABLE_GOSSIP_TICKS { + chan.set_channel_update_status(ChannelUpdateStatus::Disabled); + if let Ok(update) = self.get_channel_update_for_broadcast(&chan) { + pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate { + msg: update + }); + } + should_persist = NotifyOption::DoPersist; + } else { + chan.set_channel_update_status(ChannelUpdateStatus::DisabledStaged(n)); } - should_persist = NotifyOption::DoPersist; - chan.set_channel_update_status(ChannelUpdateStatus::Disabled); }, - ChannelUpdateStatus::EnabledStaged if chan.is_live() => { - if let Ok(update) = self.get_channel_update_for_broadcast(&chan) { - pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate { - msg: update - }); + ChannelUpdateStatus::EnabledStaged(mut n) if chan.is_live() => { + n += 1; + if n >= ENABLE_GOSSIP_TICKS { + chan.set_channel_update_status(ChannelUpdateStatus::Enabled); + if let Ok(update) = self.get_channel_update_for_broadcast(&chan) { + pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate { + msg: update + }); + } + should_persist = NotifyOption::DoPersist; + } else { + chan.set_channel_update_status(ChannelUpdateStatus::EnabledStaged(n)); } - should_persist = NotifyOption::DoPersist; - chan.set_channel_update_status(ChannelUpdateStatus::Enabled); }, _ => {}, } diff --git a/lightning/src/ln/functional_test_utils.rs b/lightning/src/ln/functional_test_utils.rs index f8ccce05847..e818bd95502 100644 --- a/lightning/src/ln/functional_test_utils.rs +++ b/lightning/src/ln/functional_test_utils.rs @@ -2724,10 +2724,9 @@ macro_rules! handle_chan_reestablish_msgs { } let mut had_channel_update = false; // ChannelUpdate may be now or later, but not both - if let Some(&MessageSendEvent::SendChannelUpdate { ref node_id, ref msg }) = msg_events.get(idx) { + if let Some(&MessageSendEvent::SendChannelUpdate { ref node_id, .. }) = msg_events.get(idx) { assert_eq!(*node_id, $dst_node.node.get_our_node_id()); idx += 1; - assert_eq!(msg.contents.flags & 2, 0); // "disabled" flag must not be set as we just reconnected. had_channel_update = true; } @@ -2771,10 +2770,9 @@ macro_rules! handle_chan_reestablish_msgs { } } - if let Some(&MessageSendEvent::SendChannelUpdate { ref node_id, ref msg }) = msg_events.get(idx) { + if let Some(&MessageSendEvent::SendChannelUpdate { ref node_id, .. }) = msg_events.get(idx) { assert_eq!(*node_id, $dst_node.node.get_our_node_id()); idx += 1; - assert_eq!(msg.contents.flags & 2, 0); // "disabled" flag must not be set as we just reconnected. assert!(!had_channel_update); } diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs index 5d07edc2e53..c07775c8785 100644 --- a/lightning/src/ln/functional_tests.rs +++ b/lightning/src/ln/functional_tests.rs @@ -21,7 +21,7 @@ use crate::chain::keysinterface::{ChannelSigner, EcdsaChannelSigner, EntropySour use crate::events::{Event, MessageSendEvent, MessageSendEventsProvider, PathFailure, PaymentPurpose, ClosureReason, HTLCDestination, PaymentFailureReason}; use crate::ln::{PaymentPreimage, PaymentSecret, PaymentHash}; use crate::ln::channel::{commitment_tx_base_weight, COMMITMENT_TX_WEIGHT_PER_HTLC, CONCURRENT_INBOUND_HTLC_FEE_BUFFER, FEE_SPIKE_BUFFER_FEE_INCREASE_MULTIPLE, MIN_AFFORDABLE_HTLC_COUNT}; -use crate::ln::channelmanager::{self, PaymentId, RAACommitmentOrder, PaymentSendFailure, RecipientOnionFields, BREAKDOWN_TIMEOUT, MIN_CLTV_EXPIRY_DELTA}; +use crate::ln::channelmanager::{self, PaymentId, RAACommitmentOrder, PaymentSendFailure, RecipientOnionFields, BREAKDOWN_TIMEOUT, ENABLE_GOSSIP_TICKS, DISABLE_GOSSIP_TICKS, MIN_CLTV_EXPIRY_DELTA}; use crate::ln::channel::{Channel, ChannelError}; use crate::ln::{chan_utils, onion_utils}; use crate::ln::chan_utils::{OFFERED_HTLC_SCRIPT_WEIGHT, htlc_success_tx_weight, htlc_timeout_tx_weight, HTLCOutputInCommitment}; @@ -7100,8 +7100,9 @@ fn test_announce_disable_channels() { nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id()); nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id()); - nodes[0].node.timer_tick_occurred(); // Enabled -> DisabledStaged - nodes[0].node.timer_tick_occurred(); // DisabledStaged -> Disabled + for _ in 0..DISABLE_GOSSIP_TICKS + 1 { + nodes[0].node.timer_tick_occurred(); + } let msg_events = nodes[0].node.get_and_clear_pending_msg_events(); assert_eq!(msg_events.len(), 3); let mut chans_disabled = HashMap::new(); @@ -7141,7 +7142,9 @@ fn test_announce_disable_channels() { nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[2]); handle_chan_reestablish_msgs!(nodes[1], nodes[0]); - nodes[0].node.timer_tick_occurred(); + for _ in 0..ENABLE_GOSSIP_TICKS { + nodes[0].node.timer_tick_occurred(); + } assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty()); nodes[0].node.timer_tick_occurred(); let msg_events = nodes[0].node.get_and_clear_pending_msg_events(); diff --git a/lightning/src/ln/onion_route_tests.rs b/lightning/src/ln/onion_route_tests.rs index 743d41eea1b..aa3b3b7e8f6 100644 --- a/lightning/src/ln/onion_route_tests.rs +++ b/lightning/src/ln/onion_route_tests.rs @@ -16,7 +16,7 @@ use crate::chain::keysinterface::{EntropySource, NodeSigner, Recipient}; use crate::events::{Event, HTLCDestination, MessageSendEvent, MessageSendEventsProvider, PathFailure, PaymentFailureReason}; use crate::ln::{PaymentHash, PaymentSecret}; use crate::ln::channel::EXPIRE_PREV_CONFIG_TICKS; -use crate::ln::channelmanager::{HTLCForwardInfo, FailureCode, CLTV_FAR_FAR_AWAY, MIN_CLTV_EXPIRY_DELTA, PendingAddHTLCInfo, PendingHTLCInfo, PendingHTLCRouting, PaymentId, RecipientOnionFields}; +use crate::ln::channelmanager::{HTLCForwardInfo, FailureCode, CLTV_FAR_FAR_AWAY, DISABLE_GOSSIP_TICKS, MIN_CLTV_EXPIRY_DELTA, PendingAddHTLCInfo, PendingHTLCInfo, PendingHTLCRouting, PaymentId, RecipientOnionFields}; use crate::ln::onion_utils; use crate::routing::gossip::{NetworkUpdate, RoutingFees}; use crate::routing::router::{get_route, PaymentParameters, Route, RouteHint, RouteHintHop}; @@ -587,6 +587,15 @@ fn test_onion_failure() { // disconnect event to the channel between nodes[1] ~ nodes[2] nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id()); nodes[2].node.peer_disconnected(&nodes[1].node.get_our_node_id()); + }, true, Some(UPDATE|7), Some(NetworkUpdate::ChannelUpdateMessage{msg: ChannelUpdate::dummy(short_channel_id)}), Some(short_channel_id)); + run_onion_failure_test("channel_disabled", 0, &nodes, &route, &payment_hash, &payment_secret, |_| {}, || { + // disconnect event to the channel between nodes[1] ~ nodes[2] + for _ in 0..DISABLE_GOSSIP_TICKS + 1 { + nodes[1].node.timer_tick_occurred(); + nodes[2].node.timer_tick_occurred(); + } + nodes[1].node.get_and_clear_pending_msg_events(); + nodes[2].node.get_and_clear_pending_msg_events(); }, true, Some(UPDATE|20), Some(NetworkUpdate::ChannelUpdateMessage{msg: ChannelUpdate::dummy(short_channel_id)}), Some(short_channel_id)); reconnect_nodes(&nodes[1], &nodes[2], (false, false), (0, 0), (0, 0), (0, 0), (0, 0), (0, 0), (false, false));