Implement non-strict forwarding#3127

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TheBlueMatt merged 1 commit into from
Jun 20, 2024
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Implement non-strict forwarding #3127

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12 changes: 6 additions & 6 deletions fuzz/src/full_stack.rs
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

// process the now-pending HTLC forward
ext_from_hex("07", &mut test);
// Two feerate requests to check dust exposure
ext_from_hex("00fd00fd", &mut test);
// Three feerate requests to check dust exposure
ext_from_hex("00fd00fd00fd", &mut test);
// client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

// we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
// process the now-pending HTLC forward
ext_from_hex("07", &mut test);

// Two feerate requests to check dust exposure
ext_from_hex("00fd00fd", &mut test);
// Three feerate requests to check dust exposure
ext_from_hex("00fd00fd00fd", &mut test);

// client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
// we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

// process the now-pending HTLC forward
ext_from_hex("07", &mut test);
// Two feerate requests to check dust exposure
ext_from_hex("00fd00fd", &mut test);
// Three feerate requests to check dust exposure
ext_from_hex("00fd00fd00fd", &mut test);
// client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

// connect a block with one transaction of len 125
Expand Down
190 changes: 121 additions & 69 deletions lightning/src/ln/channelmanager.rs
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Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
if short_chan_id != 0 {
let mut forwarding_counterparty = None;
macro_rules! forwarding_channel_not_found {
() => {
for forward_info in pending_forwards.drain(..) {
($forward_infos: expr) => {
for forward_info in $forward_infos {
match forward_info {
HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
Some((cp_id, chan_id)) => (cp_id, chan_id),
None => {
forwarding_channel_not_found!();
forwarding_channel_not_found!(pending_forwards.drain(..));
continue;
}
};
forwarding_counterparty = Some(counterparty_node_id);
let per_peer_state = self.per_peer_state.read().unwrap();
let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
if peer_state_mutex_opt.is_none() {
forwarding_channel_not_found!();
forwarding_channel_not_found!(pending_forwards.drain(..));
continue;
}
let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
let peer_state = &mut *peer_state_lock;
if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
let logger = WithChannelContext::from(&self.logger, &chan.context, None);
for forward_info in pending_forwards.drain(..) {
let queue_fail_htlc_res = match forward_info {
HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
prev_user_channel_id, forward_info: PendingHTLCInfo {
incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
routing: PendingHTLCRouting::Forward {
onion_packet, blinded, ..
}, skimmed_fee_msat, ..
let mut draining_pending_forwards = pending_forwards.drain(..);
while let Some(forward_info) = draining_pending_forwards.next() {
let queue_fail_htlc_res = match forward_info {
HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
prev_user_channel_id, forward_info: PendingHTLCInfo {
incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
routing: PendingHTLCRouting::Forward {
ref onion_packet, blinded, ..
}, skimmed_fee_msat, ..
},
}) => {
let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
short_channel_id: prev_short_channel_id,
user_channel_id: Some(prev_user_channel_id),
channel_id: prev_channel_id,
outpoint: prev_funding_outpoint,
htlc_id: prev_htlc_id,
incoming_packet_shared_secret: incoming_shared_secret,
// Phantom payments are only PendingHTLCRouting::Receive.
phantom_shared_secret: None,
blinded_failure: blinded.map(|b| b.failure),
});
let next_blinding_point = blinded.and_then(|b| {
let encrypted_tlvs_ss = self.node_signer.ecdh(
Recipient::Node, &b.inbound_blinding_point, None
).unwrap().secret_bytes();
onion_utils::next_hop_pubkey(
&self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
).ok()
});

// Forward the HTLC over the most appropriate channel with the corresponding peer,
// applying non-strict forwarding.
// The channel with the least amount of outbound liquidity will be used to maximize the
// probability of being able to successfully forward a subsequent HTLC.
let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
ChannelPhase::Funded(chan) => {
let balances = chan.context.get_available_balances(&self.fee_estimator);
if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
chan.context.is_usable() {
Some((chan, balances))
} else {
None
}
},
}) => {
let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
short_channel_id: prev_short_channel_id,
user_channel_id: Some(prev_user_channel_id),
channel_id: prev_channel_id,
outpoint: prev_funding_outpoint,
htlc_id: prev_htlc_id,
incoming_packet_shared_secret: incoming_shared_secret,
// Phantom payments are only PendingHTLCRouting::Receive.
phantom_shared_secret: None,
blinded_failure: blinded.map(|b| b.failure),
});
let next_blinding_point = blinded.and_then(|b| {
let encrypted_tlvs_ss = self.node_signer.ecdh(
Recipient::Node, &b.inbound_blinding_point, None
).unwrap().secret_bytes();
onion_utils::next_hop_pubkey(
&self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
).ok()
});
if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
payment_hash, outgoing_cltv_value, htlc_source.clone(),
onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
&&logger)
{
if let ChannelError::Ignore(msg) = e {
log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
_ => None,
}).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
let optimal_channel = match maybe_optimal_channel {
Some(chan) => chan,
None => {
// Fall back to the specified channel to return an appropriate error.
if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
chan
} else {
panic!("Stated return value requirements in send_htlc() were not met");
forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
break;
}
}
};

let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
"specified"
} else {
"alternate"
};
log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
payment_hash, outgoing_cltv_value, htlc_source.clone(),
onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
&&logger)
{
if let ChannelError::Ignore(msg) = e {
log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
} else {
panic!("Stated return value requirements in send_htlc() were not met");
}

if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
failed_forwards.push((htlc_source, payment_hash,
HTLCFailReason::reason(failure_code, data),
HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
));
continue;
} else {
forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
break;
}
None
},
HTLCForwardInfo::AddHTLC { .. } => {
panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
},
HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
}
None
},
HTLCForwardInfo::AddHTLC { .. } => {
panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
},
HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
let logger = WithChannelContext::from(&self.logger, &chan.context, None);
log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
},
HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
} else {
forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
break;
}
},
HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
let logger = WithChannelContext::from(&self.logger, &chan.context, None);
log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
let res = chan.queue_fail_malformed_htlc(
htlc_id, failure_code, sha256_of_onion, &&logger
);
Some((res, htlc_id))
},
};
if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
if let Err(e) = queue_fail_htlc_res {
if let ChannelError::Ignore(msg) = e {
} else {
forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
break;
}
},
};
if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
if let Err(e) = queue_fail_htlc_res {
if let ChannelError::Ignore(msg) = e {
if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
let logger = WithChannelContext::from(&self.logger, &chan.context, None);
log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
} else {
panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
}
// fail-backs are best-effort, we probably already have one
// pending, and if not that's OK, if not, the channel is on
// the chain and sending the HTLC-Timeout is their problem.
continue;
} else {
panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
}
// fail-backs are best-effort, we probably already have one
// pending, and if not that's OK, if not, the channel is on
// the chain and sending the HTLC-Timeout is their problem.
continue;
}
}
} else {
forwarding_channel_not_found!();
continue;
}
} else {
'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
Loading
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 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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Implement non-strict forwarding#3127

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 Merged

TheBlueMatt
merged 1 commit into

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Jun 20, 2024
 Merged


Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
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var __re = new RegExp('^' + ".*" + '

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Implement non-strict forwarding#3127

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 Merged

TheBlueMatt
merged 1 commit into

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Jun 20, 2024
 Merged


Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Implement non-strict forwarding#3127

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 Merged

TheBlueMatt
merged 1 commit into

from

Jun 20, 2024
 Merged


Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
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var __re = new RegExp('^' + "youtube\\.com" + '

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 Merged

TheBlueMatt
merged 1 commit into

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Jun 20, 2024
 Merged


Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
Loading

, 'i');
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Implement non-strict forwarding#3127

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Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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Implement non-strict forwarding#3127

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 Merged

TheBlueMatt
merged 1 commit into

from

Jun 20, 2024
 Merged


Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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 Merged

TheBlueMatt
merged 1 commit into

from

Jun 20, 2024
 Merged


Implement non-strict forwarding
#3127
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12 changes: 6 additions & 6 deletions
fuzz/src/full_stack.rs

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -1366,8 +1366,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7: UpdateHTLCs event for node 03020000 with 1 HTLCs for channel 3f000000)

 // we respond with commitment_signed then revoke_and_ack (a weird, but valid, order)
Expand DownExpand Up@@ -1478,8 +1478,8 @@ mod tests {
 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);

 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);

 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)
 // we respond with revoke_and_ack, then commitment_signed, then update_fail_htlc
Expand DownExpand Up@@ -1602,8 +1602,8 @@ mod tests {

 // process the now-pending HTLC forward
 ext_from_hex("07", &mut test);
 // Two feerate requests to check dust exposure
 ext_from_hex("00fd00fd", &mut test);
 // Three feerate requests to check dust exposure
 ext_from_hex("00fd00fd00fd", &mut test);
 // client now sends id 1 update_add_htlc and commitment_signed (CHECK 7 duplicate)

 // connect a block with one transaction of len 125
Expand Down

190 changes: 121 additions & 69 deletions
lightning/src/ln/channelmanager.rs

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -4895,8 +4895,8 @@ where
 if short_chan_id != 0 {
 let mut forwarding_counterparty = None;
 macro_rules! forwarding_channel_not_found {
 () => {
 for forward_info in pending_forwards.drain(..) {
 ($forward_infos: expr) => {
 for forward_info in $forward_infos {
 match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
Expand DownExpand Up@@ -5004,104 +5004,156 @@ where
 let (counterparty_node_id, forward_chan_id) = match chan_info_opt {
 Some((cp_id, chan_id)) => (cp_id, chan_id),
 None => {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 };
 forwarding_counterparty = Some(counterparty_node_id);
 let per_peer_state = self.per_peer_state.read().unwrap();
 let peer_state_mutex_opt = per_peer_state.get(&counterparty_node_id);
 if peer_state_mutex_opt.is_none() {
 forwarding_channel_not_found!();
 forwarding_channel_not_found!(pending_forwards.drain(..));
 continue;
 }
 let mut peer_state_lock = peer_state_mutex_opt.unwrap().lock().unwrap();
 let peer_state = &mut *peer_state_lock;
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 for forward_info in pending_forwards.drain(..) {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 let mut draining_pending_forwards = pending_forwards.drain(..);
 while let Some(forward_info) = draining_pending_forwards.next() {
 let queue_fail_htlc_res = match forward_info {
 HTLCForwardInfo::AddHTLC(PendingAddHTLCInfo {
 prev_short_channel_id, prev_htlc_id, prev_channel_id, prev_funding_outpoint,
 prev_user_channel_id, forward_info: PendingHTLCInfo {
 incoming_shared_secret, payment_hash, outgoing_amt_msat, outgoing_cltv_value,
 routing: PendingHTLCRouting::Forward {
 ref onion_packet, blinded, ..
 }, skimmed_fee_msat, ..
 },
 }) => {
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });

 // Forward the HTLC over the most appropriate channel with the corresponding peer,
 // applying non-strict forwarding.
 // The channel with the least amount of outbound liquidity will be used to maximize the
 // probability of being able to successfully forward a subsequent HTLC.
 let maybe_optimal_channel = peer_state.channel_by_id.values_mut().filter_map(|phase| match phase {
 ChannelPhase::Funded(chan) => {
 let balances = chan.context.get_available_balances(&self.fee_estimator);
 if outgoing_amt_msat <= balances.next_outbound_htlc_limit_msat &&
 outgoing_amt_msat >= balances.next_outbound_htlc_minimum_msat &&
 chan.context.is_usable() {
 Some((chan, balances))
 } else {
 None
 }
 },
 }) => {
 let logger = WithChannelContext::from(&self.logger, &chan.context, Some(payment_hash));
 log_trace!(logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, &payment_hash, short_chan_id);
 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
 short_channel_id: prev_short_channel_id,
 user_channel_id: Some(prev_user_channel_id),
 channel_id: prev_channel_id,
 outpoint: prev_funding_outpoint,
 htlc_id: prev_htlc_id,
 incoming_packet_shared_secret: incoming_shared_secret,
 // Phantom payments are only PendingHTLCRouting::Receive.
 phantom_shared_secret: None,
 blinded_failure: blinded.map(|b| b.failure),
 });
 let next_blinding_point = blinded.and_then(|b| {
 let encrypted_tlvs_ss = self.node_signer.ecdh(
 Recipient::Node, &b.inbound_blinding_point, None
 ).unwrap().secret_bytes();
 onion_utils::next_hop_pubkey(
 &self.secp_ctx, b.inbound_blinding_point, &encrypted_tlvs_ss
 ).ok()
 });
 if let Err(e) = chan.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet, skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {}: {}", &payment_hash, msg);
 _ => None,
 }).min_by_key(|(_, balances)| balances.next_outbound_htlc_limit_msat).map(|(c, _)| c);
 let optimal_channel = match maybe_optimal_channel {
 Some(chan) => chan,
 None => {
 // Fall back to the specified channel to return an appropriate error.
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 chan
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 }
 };

 let logger = WithChannelContext::from(&self.logger, &optimal_channel.context, Some(payment_hash));
 let channel_description = if optimal_channel.context.get_short_channel_id() == Some(short_chan_id) {
 "specified"
 } else {
 "alternate"
 };
 log_trace!(logger, "Forwarding HTLC from SCID {} with payment_hash {} and next hop SCID {} over {} channel {} with corresponding peer {}",
 prev_short_channel_id, &payment_hash, short_chan_id, channel_description, optimal_channel.context.channel_id(), &counterparty_node_id);
 if let Err(e) = optimal_channel.queue_add_htlc(outgoing_amt_msat,
 payment_hash, outgoing_cltv_value, htlc_source.clone(),
 onion_packet.clone(), skimmed_fee_msat, next_blinding_point, &self.fee_estimator,
 &&logger)
 {
 if let ChannelError::Ignore(msg) = e {
 log_trace!(logger, "Failed to forward HTLC with payment_hash {} to peer {}: {}", &payment_hash, &counterparty_node_id, msg);
 } else {
 panic!("Stated return value requirements in send_htlc() were not met");
 }

 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan);
 failed_forwards.push((htlc_source, payment_hash,
 HTLCFailReason::reason(failure_code, data),
 HTLCDestination::NextHopChannel { node_id: Some(chan.context.get_counterparty_node_id()), channel_id: forward_chan_id }
 ));
 continue;
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
 }
 None
 },
 HTLCForwardInfo::AddHTLC { .. } => {
 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
 },
 HTLCForwardInfo::FailHTLC { htlc_id, ref err_packet } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 Some((chan.queue_fail_htlc(htlc_id, err_packet, &&logger), htlc_id))
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 Some((chan.queue_fail_htlc(htlc_id, err_packet.clone(), &&logger), htlc_id))
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 HTLCForwardInfo::FailMalformedHTLC { htlc_id, failure_code, sha256_of_onion } => {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failing malformed HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
 let res = chan.queue_fail_malformed_htlc(
 htlc_id, failure_code, sha256_of_onion, &&logger
 );
 Some((res, htlc_id))
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 } else {
 forwarding_channel_not_found!(core::iter::once(forward_info).chain(draining_pending_forwards));
 break;
 }
 },
 };
 if let Some((queue_fail_htlc_res, htlc_id)) = queue_fail_htlc_res {
 if let Err(e) = queue_fail_htlc_res {
 if let ChannelError::Ignore(msg) = e {
 if let Some(ChannelPhase::Funded(ref mut chan)) = peer_state.channel_by_id.get_mut(&forward_chan_id) {
 let logger = WithChannelContext::from(&self.logger, &chan.context, None);
 log_trace!(logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 } else {
 panic!("Stated return value requirements in queue_fail_{{malformed_}}htlc() were not met");
 }
 // fail-backs are best-effort, we probably already have one
 // pending, and if not that's OK, if not, the channel is on
 // the chain and sending the HTLC-Timeout is their problem.
 continue;
 }
 }
 } else {
 forwarding_channel_not_found!();
 continue;
 }
 } else {
 'next_forwardable_htlc: for forward_info in pending_forwards.drain(..) {
Expand Down
Loading