From e23102f5655c87896f01c721ea5342fbdb81fae9 Mon Sep 17 00:00:00 2001
From: Duncan Dean <git@dunxen.dev>
Date: Thu, 1 Jun 2023 10:23:55 +0200
Subject: [PATCH] Add `networks` TLV to `Init`'s TLV stream

This was a fairly old introduction to the spec to allow nodes to indicate
to their peers what chains they are interested in (i.e. will open channels
and gossip for).

We don't do any of the handling of this message in this commit and leave
that to the very next commit, so the behaviour is effectively the same
(ignore networks preference).
---
 fuzz/src/chanmon_consistency.rs               | 40 ++++++++---
 lightning-background-processor/src/lib.rs     |  8 ++-
 lightning/src/ln/chanmon_update_fail_tests.rs | 72 ++++++++++++++-----
 lightning/src/ln/channelmanager.rs            | 32 ++++++---
 lightning/src/ln/functional_test_utils.rs     | 20 ++++--
 lightning/src/ln/functional_tests.rs          | 32 ++++++---
 lightning/src/ln/msgs.rs                      | 29 ++++++--
 lightning/src/ln/payment_tests.rs             | 16 +++--
 lightning/src/ln/peer_handler.rs              |  4 +-
 lightning/src/ln/priv_short_conf_tests.rs     | 16 +++--
 lightning/src/ln/reload_tests.rs              | 56 +++++++++++----
 lightning/src/ln/reorg_tests.rs               |  4 +-
 lightning/src/ln/shutdown_tests.rs            | 16 +++--
 .../src/onion_message/functional_tests.rs     |  2 +-
 lightning/src/routing/gossip.rs               |  4 +-
 15 files changed, 262 insertions(+), 89 deletions(-)

diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs
index f8c6c08a2..6e2ab0d89 100644
--- a/fuzz/src/chanmon_consistency.rs
+++ b/fuzz/src/chanmon_consistency.rs
@@ -474,8 +474,12 @@ pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 	let mut channel_txn = Vec::new();
 	macro_rules! make_channel {
 		($source: expr, $dest: expr, $chan_id: expr) => { {
-			$source.peer_connected(&$dest.get_our_node_id(), &Init { features: $dest.init_features(), remote_network_address: None }, true).unwrap();
-			$dest.peer_connected(&$source.get_our_node_id(), &Init { features: $source.init_features(), remote_network_address: None }, false).unwrap();
+			$source.peer_connected(&$dest.get_our_node_id(), &Init {
+				features: $dest.init_features(), networks: None, remote_network_address: None
+			}, true).unwrap();
+			$dest.peer_connected(&$source.get_our_node_id(), &Init {
+				features: $source.init_features(), networks: None, remote_network_address: None
+			}, false).unwrap();
 
 			$source.create_channel($dest.get_our_node_id(), 100_000, 42, 0, None).unwrap();
 			let open_channel = {
@@ -1006,15 +1010,23 @@ pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 			},
 			0x0e => {
 				if chan_a_disconnected {
-					nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, true).unwrap();
-					nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }, false).unwrap();
+					nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
+						features: nodes[1].init_features(), networks: None, remote_network_address: None
+					}, true).unwrap();
+					nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
+						features: nodes[0].init_features(), networks: None, remote_network_address: None
+					}, false).unwrap();
 					chan_a_disconnected = false;
 				}
 			},
 			0x0f => {
 				if chan_b_disconnected {
-					nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }, true).unwrap();
-					nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, false).unwrap();
+					nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
+						features: nodes[2].init_features(), networks: None, remote_network_address: None
+					}, true).unwrap();
+					nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
+						features: nodes[1].init_features(), networks: None, remote_network_address: None
+					}, false).unwrap();
 					chan_b_disconnected = false;
 				}
 			},
@@ -1209,13 +1221,21 @@ pub fn do_test<Out: Output>(data: &[u8], underlying_out: Out) {
 
 				// Next, make sure peers are all connected to each other
 				if chan_a_disconnected {
-					nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, true).unwrap();
-					nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init { features: nodes[0].init_features(), remote_network_address: None }, false).unwrap();
+					nodes[0].peer_connected(&nodes[1].get_our_node_id(), &Init {
+						features: nodes[1].init_features(), networks: None, remote_network_address: None
+					}, true).unwrap();
+					nodes[1].peer_connected(&nodes[0].get_our_node_id(), &Init {
+						features: nodes[0].init_features(), networks: None, remote_network_address: None
+					}, false).unwrap();
 					chan_a_disconnected = false;
 				}
 				if chan_b_disconnected {
-					nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init { features: nodes[2].init_features(), remote_network_address: None }, true).unwrap();
-					nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init { features: nodes[1].init_features(), remote_network_address: None }, false).unwrap();
+					nodes[1].peer_connected(&nodes[2].get_our_node_id(), &Init {
+						features: nodes[2].init_features(), networks: None, remote_network_address: None
+					}, true).unwrap();
+					nodes[2].peer_connected(&nodes[1].get_our_node_id(), &Init {
+						features: nodes[1].init_features(), networks: None, remote_network_address: None
+					}, false).unwrap();
 					chan_b_disconnected = false;
 				}
 
diff --git a/lightning-background-processor/src/lib.rs b/lightning-background-processor/src/lib.rs
index 297a98023..ef8a07de1 100644
--- a/lightning-background-processor/src/lib.rs
+++ b/lightning-background-processor/src/lib.rs
@@ -1157,8 +1157,12 @@ mod tests {
 
 		for i in 0..num_nodes {
 			for j in (i+1)..num_nodes {
-				nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &Init { features: nodes[j].node.init_features(), remote_network_address: None }, true).unwrap();
-				nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &Init { features: nodes[i].node.init_features(), remote_network_address: None }, false).unwrap();
+				nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &Init {
+					features: nodes[j].node.init_features(), networks: None, remote_network_address: None
+				}, true).unwrap();
+				nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &Init {
+					features: nodes[i].node.init_features(), networks: None, remote_network_address: None
+				}, false).unwrap();
 			}
 		}
 
diff --git a/lightning/src/ln/chanmon_update_fail_tests.rs b/lightning/src/ln/chanmon_update_fail_tests.rs
index e59cf47f1..015650cb8 100644
--- a/lightning/src/ln/chanmon_update_fail_tests.rs
+++ b/lightning/src/ln/chanmon_update_fail_tests.rs
@@ -350,10 +350,14 @@ fn do_test_monitor_temporary_update_fail(disconnect_count: usize) {
 		nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 		nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+			features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 		assert_eq!(reestablish_1.len(), 1);
-		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 		let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 		assert_eq!(reestablish_2.len(), 1);
 
@@ -372,10 +376,14 @@ fn do_test_monitor_temporary_update_fail(disconnect_count: usize) {
 		assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
 		assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 
-		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+			features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 		assert_eq!(reestablish_1.len(), 1);
-		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 		let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 		assert_eq!(reestablish_2.len(), 1);
 
@@ -1136,8 +1144,12 @@ fn test_monitor_update_fail_reestablish() {
 	commitment_signed_dance!(nodes[1], nodes[2], updates.commitment_signed, false);
 
 	chanmon_cfgs[1].persister.set_update_ret(ChannelMonitorUpdateStatus::InProgress);
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 
 	let as_reestablish = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
 	let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
@@ -1155,8 +1167,12 @@ fn test_monitor_update_fail_reestablish() {
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 
 	assert_eq!(get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap(), as_reestablish);
 	assert_eq!(get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap(), bs_reestablish);
@@ -1331,8 +1347,12 @@ fn claim_while_disconnected_monitor_update_fail() {
 	check_added_monitors!(nodes[1], 1);
 	expect_payment_claimed!(nodes[1], payment_hash_1, 1_000_000);
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 
 	let as_reconnect = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
 	let bs_reconnect = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
@@ -1467,8 +1487,12 @@ fn monitor_failed_no_reestablish_response() {
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 
 	let as_reconnect = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
 	let bs_reconnect = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
@@ -2076,9 +2100,13 @@ fn test_pending_update_fee_ack_on_reconnect() {
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let as_connect_msg = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let bs_connect_msg = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 
 	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &as_connect_msg);
@@ -2204,9 +2232,13 @@ fn do_update_fee_resend_test(deliver_update: bool, parallel_updates: bool) {
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let as_connect_msg = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let bs_connect_msg = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 
 	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &as_connect_msg);
@@ -2341,10 +2373,14 @@ fn do_channel_holding_cell_serialize(disconnect: bool, reload_a: bool) {
 		nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
 		// Now reconnect the two
-		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+			features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 		assert_eq!(reestablish_1.len(), 1);
-		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 		let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 		assert_eq!(reestablish_2.len(), 1);
 
diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs
index 0aa2a8552..2f6158b7f 100644
--- a/lightning/src/ln/channelmanager.rs
+++ b/lightning/src/ln/channelmanager.rs
@@ -9297,12 +9297,14 @@ mod tests {
 				&SecretKey::from_slice(&nodes[1].keys_manager.get_secure_random_bytes()).unwrap());
 			peer_pks.push(random_pk);
 			nodes[1].node.peer_connected(&random_pk, &msgs::Init {
-				features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+				features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+			}, true).unwrap();
 		}
 		let last_random_pk = PublicKey::from_secret_key(&nodes[0].node.secp_ctx,
 			&SecretKey::from_slice(&nodes[1].keys_manager.get_secure_random_bytes()).unwrap());
 		nodes[1].node.peer_connected(&last_random_pk, &msgs::Init {
-			features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap_err();
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap_err();
 
 		// Also importantly, because nodes[0] isn't "protected", we will refuse a reconnection from
 		// them if we have too many un-channel'd peers.
@@ -9313,13 +9315,16 @@ mod tests {
 			if let Event::ChannelClosed { .. } = ev { } else { panic!(); }
 		}
 		nodes[1].node.peer_connected(&last_random_pk, &msgs::Init {
-			features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
-			features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap_err();
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap_err();
 
 		// but of course if the connection is outbound its allowed...
 		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
-			features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 		nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
 		// Now nodes[0] is disconnected but still has a pending, un-funded channel lying around.
@@ -9343,7 +9348,8 @@ mod tests {
 		// "protected" and can connect again.
 		mine_transaction(&nodes[1], funding_tx.as_ref().unwrap());
 		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
-			features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		get_event_msg!(nodes[1], MessageSendEvent::SendChannelReestablish, nodes[0].node.get_our_node_id());
 
 		// Further, because the first channel was funded, we can open another channel with
@@ -9408,7 +9414,8 @@ mod tests {
 			let random_pk = PublicKey::from_secret_key(&nodes[0].node.secp_ctx,
 				&SecretKey::from_slice(&nodes[1].keys_manager.get_secure_random_bytes()).unwrap());
 			nodes[1].node.peer_connected(&random_pk, &msgs::Init {
-				features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+				features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+			}, true).unwrap();
 
 			nodes[1].node.handle_open_channel(&random_pk, &open_channel_msg);
 			let events = nodes[1].node.get_and_clear_pending_events();
@@ -9426,7 +9433,8 @@ mod tests {
 		let last_random_pk = PublicKey::from_secret_key(&nodes[0].node.secp_ctx,
 			&SecretKey::from_slice(&nodes[1].keys_manager.get_secure_random_bytes()).unwrap());
 		nodes[1].node.peer_connected(&last_random_pk, &msgs::Init {
-			features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		nodes[1].node.handle_open_channel(&last_random_pk, &open_channel_msg);
 		let events = nodes[1].node.get_and_clear_pending_events();
 		match events[0] {
@@ -9570,8 +9578,12 @@ pub mod bench {
 		});
 		let node_b_holder = ANodeHolder { node: &node_b };
 
-		node_a.peer_connected(&node_b.get_our_node_id(), &Init { features: node_b.init_features(), remote_network_address: None }, true).unwrap();
-		node_b.peer_connected(&node_a.get_our_node_id(), &Init { features: node_a.init_features(), remote_network_address: None }, false).unwrap();
+		node_a.peer_connected(&node_b.get_our_node_id(), &Init {
+			features: node_b.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
+		node_b.peer_connected(&node_a.get_our_node_id(), &Init {
+			features: node_a.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 		node_a.create_channel(node_b.get_our_node_id(), 8_000_000, 100_000_000, 42, None).unwrap();
 		node_b.handle_open_channel(&node_a.get_our_node_id(), &get_event_msg!(node_a_holder, MessageSendEvent::SendOpenChannel, node_b.get_our_node_id()));
 		node_a.handle_accept_channel(&node_b.get_our_node_id(), &get_event_msg!(node_b_holder, MessageSendEvent::SendAcceptChannel, node_a.get_our_node_id()));
diff --git a/lightning/src/ln/functional_test_utils.rs b/lightning/src/ln/functional_test_utils.rs
index 93841517b..b7200e102 100644
--- a/lightning/src/ln/functional_test_utils.rs
+++ b/lightning/src/ln/functional_test_utils.rs
@@ -2571,8 +2571,16 @@ pub fn create_network<'a, 'b: 'a, 'c: 'b>(node_count: usize, cfgs: &'b Vec<NodeC
 
 	for i in 0..node_count {
 		for j in (i+1)..node_count {
-			nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &msgs::Init { features: nodes[j].override_init_features.borrow().clone().unwrap_or_else(|| nodes[j].node.init_features()), remote_network_address: None }, true).unwrap();
-			nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &msgs::Init { features: nodes[i].override_init_features.borrow().clone().unwrap_or_else(|| nodes[i].node.init_features()), remote_network_address: None }, false).unwrap();
+			nodes[i].node.peer_connected(&nodes[j].node.get_our_node_id(), &msgs::Init {
+				features: nodes[j].override_init_features.borrow().clone().unwrap_or_else(|| nodes[j].node.init_features()),
+				networks: None,
+				remote_network_address: None,
+			}, true).unwrap();
+			nodes[j].node.peer_connected(&nodes[i].node.get_our_node_id(), &msgs::Init {
+				features: nodes[i].override_init_features.borrow().clone().unwrap_or_else(|| nodes[i].node.init_features()),
+				networks: None,
+				remote_network_address: None,
+			}, false).unwrap();
 		}
 	}
 
@@ -2856,9 +2864,13 @@ macro_rules! handle_chan_reestablish_msgs {
 /// pending_htlc_adds includes both the holding cell and in-flight update_add_htlcs, whereas
 /// for claims/fails they are separated out.
 pub fn reconnect_nodes<'a, 'b, 'c>(node_a: &Node<'a, 'b, 'c>, node_b: &Node<'a, 'b, 'c>, send_channel_ready: (bool, bool), pending_htlc_adds: (i64, i64), pending_htlc_claims: (usize, usize), pending_htlc_fails: (usize, usize), pending_cell_htlc_claims: (usize, usize), pending_cell_htlc_fails: (usize, usize), pending_raa: (bool, bool))  {
-	node_a.node.peer_connected(&node_b.node.get_our_node_id(), &msgs::Init { features: node_b.node.init_features(), remote_network_address: None }, true).unwrap();
+	node_a.node.peer_connected(&node_b.node.get_our_node_id(), &msgs::Init {
+		features: node_b.node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish_1 = get_chan_reestablish_msgs!(node_a, node_b);
-	node_b.node.peer_connected(&node_a.node.get_our_node_id(), &msgs::Init { features: node_a.node.init_features(), remote_network_address: None }, false).unwrap();
+	node_b.node.peer_connected(&node_a.node.get_our_node_id(), &msgs::Init {
+		features: node_a.node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let reestablish_2 = get_chan_reestablish_msgs!(node_b, node_a);
 
 	if send_channel_ready.0 {
diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs
index 508c540df..17a105e35 100644
--- a/lightning/src/ln/functional_tests.rs
+++ b/lightning/src/ln/functional_tests.rs
@@ -4025,10 +4025,14 @@ fn test_drop_messages_peer_disconnect_dual_htlc() {
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 	assert_eq!(reestablish_1.len(), 1);
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 	assert_eq!(reestablish_2.len(), 1);
 
@@ -6343,10 +6347,14 @@ fn test_update_add_htlc_bolt2_receiver_check_repeated_id_ignore() {
 	//Disconnect and Reconnect
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 	assert_eq!(reestablish_1.len(), 1);
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 	assert_eq!(reestablish_2.len(), 1);
 	nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]);
@@ -7109,10 +7117,14 @@ fn test_announce_disable_channels() {
 		}
 	}
 	// Reconnect peers
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 	assert_eq!(reestablish_1.len(), 3);
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 	assert_eq!(reestablish_2.len(), 3);
 
@@ -10032,9 +10044,13 @@ fn test_disconnects_peer_awaiting_response_ticks() {
 	// final `RevokeAndACK` to Bob to complete it.
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
-	let bob_init = msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None };
+	let bob_init = msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	};
 	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &bob_init, true).unwrap();
-	let alice_init = msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None };
+	let alice_init = msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	};
 	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &alice_init, true).unwrap();
 
 	// Upon reconnection, Alice sends her `ChannelReestablish` to Bob. Alice, however, hasn't
diff --git a/lightning/src/ln/msgs.rs b/lightning/src/ln/msgs.rs
index d32eb3e47..0132497c6 100644
--- a/lightning/src/ln/msgs.rs
+++ b/lightning/src/ln/msgs.rs
@@ -24,6 +24,7 @@
 //! raw socket events into your non-internet-facing system and then send routing events back to
 //! track the network on the less-secure system.
 
+use bitcoin::blockdata::constants::ChainHash;
 use bitcoin::secp256k1::PublicKey;
 use bitcoin::secp256k1::ecdsa::Signature;
 use bitcoin::{secp256k1, Witness};
@@ -88,6 +89,10 @@ pub enum DecodeError {
 pub struct Init {
 	/// The relevant features which the sender supports.
 	pub features: InitFeatures,
+	/// Indicates chains the sender is interested in.
+	///
+	/// If there are no common chains, the connection will be closed.
+	pub networks: Option<Vec<ChainHash>>,
 	/// The receipient's network address.
 	///
 	/// This adds the option to report a remote IP address back to a connecting peer using the init
@@ -1728,7 +1733,8 @@ impl Writeable for Init {
 		self.features.write_up_to_13(w)?;
 		self.features.write(w)?;
 		encode_tlv_stream!(w, {
-			(3, self.remote_network_address, option)
+			(1, self.networks.as_ref().map(|n| WithoutLength(n)), option),
+			(3, self.remote_network_address, option),
 		});
 		Ok(())
 	}
@@ -1739,11 +1745,14 @@ impl Readable for Init {
 		let global_features: InitFeatures = Readable::read(r)?;
 		let features: InitFeatures = Readable::read(r)?;
 		let mut remote_network_address: Option<NetAddress> = None;
+		let mut networks: Option<WithoutLength<Vec<ChainHash>>> = None;
 		decode_tlv_stream!(r, {
+			(1, networks, option),
 			(3, remote_network_address, option)
 		});
 		Ok(Init {
 			features: features | global_features,
+			networks: networks.map(|n| n.0),
 			remote_network_address,
 		})
 	}
@@ -2416,6 +2425,7 @@ impl_writeable_msg!(GossipTimestampFilter, {
 
 #[cfg(test)]
 mod tests {
+	use bitcoin::blockdata::constants::ChainHash;
 	use bitcoin::{Transaction, PackedLockTime, TxIn, Script, Sequence, Witness, TxOut};
 	use hex;
 	use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
@@ -3423,27 +3433,36 @@ mod tests {
 
 	#[test]
 	fn encoding_init() {
+		let mainnet_hash = ChainHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap();
 		assert_eq!(msgs::Init {
 			features: InitFeatures::from_le_bytes(vec![0xFF, 0xFF, 0xFF]),
+			networks: Some(vec![mainnet_hash]),
 			remote_network_address: None,
-		}.encode(), hex::decode("00023fff0003ffffff").unwrap());
+		}.encode(), hex::decode("00023fff0003ffffff01206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap());
 		assert_eq!(msgs::Init {
 			features: InitFeatures::from_le_bytes(vec![0xFF]),
+			networks: None,
 			remote_network_address: None,
 		}.encode(), hex::decode("0001ff0001ff").unwrap());
 		assert_eq!(msgs::Init {
 			features: InitFeatures::from_le_bytes(vec![]),
+			networks: Some(vec![mainnet_hash]),
 			remote_network_address: None,
-		}.encode(), hex::decode("00000000").unwrap());
-
+		}.encode(), hex::decode("0000000001206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap());
+		assert_eq!(msgs::Init {
+			features: InitFeatures::from_le_bytes(vec![]),
+			networks: Some(vec![ChainHash::from(&[1; 32][..]), ChainHash::from(&[2; 32][..])]),
+			remote_network_address: None,
+		}.encode(), hex::decode("00000000014001010101010101010101010101010101010101010101010101010101010101010202020202020202020202020202020202020202020202020202020202020202").unwrap());
 		let init_msg = msgs::Init { features: InitFeatures::from_le_bytes(vec![]),
+			networks: Some(vec![mainnet_hash]),
 			remote_network_address: Some(msgs::NetAddress::IPv4 {
 				addr: [127, 0, 0, 1],
 				port: 1000,
 			}),
 		};
 		let encoded_value = init_msg.encode();
-		let target_value = hex::decode("000000000307017f00000103e8").unwrap();
+		let target_value = hex::decode("0000000001206fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d61900000000000307017f00000103e8").unwrap();
 		assert_eq!(encoded_value, target_value);
 		assert_eq!(msgs::Init::read(&mut Cursor::new(&target_value)).unwrap(), init_msg);
 	}
diff --git a/lightning/src/ln/payment_tests.rs b/lightning/src/ln/payment_tests.rs
index 9ba6d4357..1b63a7167 100644
--- a/lightning/src/ln/payment_tests.rs
+++ b/lightning/src/ln/payment_tests.rs
@@ -348,12 +348,16 @@ fn do_retry_with_no_persist(confirm_before_reload: bool) {
 	check_added_monitors!(nodes[0], 1);
 
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 
 	// Now nodes[1] should send a channel reestablish, which nodes[0] will respond to with an
 	// error, as the channel has hit the chain.
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 	nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
 	let as_err = nodes[0].node.get_and_clear_pending_msg_events();
@@ -518,12 +522,16 @@ fn do_test_completed_payment_not_retryable_on_reload(use_dust: bool) {
 	assert_eq!(nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap().split_off(0).len(), 1);
 	check_added_monitors!(nodes[0], 1);
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
 
 	// Now nodes[1] should send a channel reestablish, which nodes[0] will respond to with an
 	// error, as the channel has hit the chain.
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 	nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
 	let as_err = nodes[0].node.get_and_clear_pending_msg_events();
diff --git a/lightning/src/ln/peer_handler.rs b/lightning/src/ln/peer_handler.rs
index a7f35a59c..1e9486595 100644
--- a/lightning/src/ln/peer_handler.rs
+++ b/lightning/src/ln/peer_handler.rs
@@ -1333,7 +1333,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
 								peer.set_their_node_id(their_node_id);
 								insert_node_id!();
 								let features = self.init_features(&their_node_id);
-								let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
+								let resp = msgs::Init { features, networks: None, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
 								self.enqueue_message(peer, &resp);
 								peer.awaiting_pong_timer_tick_intervals = 0;
 							},
@@ -1345,7 +1345,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, OM: Deref, L: Deref, CM
 								peer.set_their_node_id(their_node_id);
 								insert_node_id!();
 								let features = self.init_features(&their_node_id);
-								let resp = msgs::Init { features, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
+								let resp = msgs::Init { features, networks: None, remote_network_address: filter_addresses(peer.their_net_address.clone()) };
 								self.enqueue_message(peer, &resp);
 								peer.awaiting_pong_timer_tick_intervals = 0;
 							},
diff --git a/lightning/src/ln/priv_short_conf_tests.rs b/lightning/src/ln/priv_short_conf_tests.rs
index 29789eea2..8d3fbf0ec 100644
--- a/lightning/src/ln/priv_short_conf_tests.rs
+++ b/lightning/src/ln/priv_short_conf_tests.rs
@@ -101,8 +101,12 @@ fn test_priv_forwarding_rejection() {
 	no_announce_cfg.accept_forwards_to_priv_channels = true;
 	reload_node!(nodes[1], no_announce_cfg, &nodes_1_serialized, &[&monitor_a_serialized, &monitor_b_serialized], persister, new_chain_monitor, nodes_1_deserialized);
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let as_reestablish = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
 	let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &as_reestablish);
@@ -110,8 +114,12 @@ fn test_priv_forwarding_rejection() {
 	get_event_msg!(nodes[0], MessageSendEvent::SendChannelUpdate, nodes[1].node.get_our_node_id());
 	get_event_msg!(nodes[1], MessageSendEvent::SendChannelUpdate, nodes[0].node.get_our_node_id());
 
-	nodes[1].node.peer_connected(&nodes[2].node.get_our_node_id(), &msgs::Init { features: nodes[2].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[2].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[2].node.get_our_node_id(), &msgs::Init {
+		features: nodes[2].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[2].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[2]).pop().unwrap();
 	let cs_reestablish = get_chan_reestablish_msgs!(nodes[2], nodes[1]).pop().unwrap();
 	nodes[2].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &bs_reestablish);
diff --git a/lightning/src/ln/reload_tests.rs b/lightning/src/ln/reload_tests.rs
index 6bb755f8c..bf2fb1de1 100644
--- a/lightning/src/ln/reload_tests.rs
+++ b/lightning/src/ln/reload_tests.rs
@@ -61,9 +61,13 @@ fn test_funding_peer_disconnect() {
 	let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
 	assert!(events_2.is_empty());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let as_reestablish = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let bs_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 
 	// nodes[0] hasn't yet received a channel_ready, so it only sends that on reconnect.
@@ -197,9 +201,13 @@ fn test_no_txn_manager_serialize_deserialize() {
 		get_monitor!(nodes[0], OutPoint { txid: tx.txid(), index: 0 }.to_channel_id()).encode();
 	reload_node!(nodes[0], nodes[0].node.encode(), &[&chan_0_monitor_serialized], persister, new_chain_monitor, nodes_0_deserialized);
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 
 	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
@@ -282,9 +290,13 @@ fn test_manager_serialize_deserialize_events() {
 	// Make sure the channel is functioning as though the de/serialization never happened
 	assert_eq!(nodes[0].node.list_channels().len(), 1);
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 
 	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]);
@@ -449,9 +461,13 @@ fn test_manager_serialize_deserialize_inconsistent_monitor() {
 	//... and we can even still claim the payment!
 	claim_payment(&nodes[2], &[&nodes[0], &nodes[1]], our_payment_preimage);
 
-	nodes[3].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[3].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let reestablish = get_chan_reestablish_msgs!(nodes[3], nodes[0]).pop().unwrap();
-	nodes[0].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init { features: nodes[3].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init {
+		features: nodes[3].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	nodes[0].node.handle_channel_reestablish(&nodes[3].node.get_our_node_id(), &reestablish);
 	let mut found_err = false;
 	for msg_event in nodes[0].node.get_and_clear_pending_msg_events() {
@@ -500,8 +516,12 @@ fn do_test_data_loss_protect(reconnect_panicing: bool) {
 	reload_node!(nodes[0], previous_node_state, &[&previous_chain_monitor_state], persister, new_chain_monitor, nodes_0_deserialized);
 
 	if reconnect_panicing {
-		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+			features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
+		nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+			features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 
 		let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
 
@@ -549,8 +569,12 @@ fn do_test_data_loss_protect(reconnect_panicing: bool) {
 	// after the warning message sent by B, we should not able to
 	// use the channel, or reconnect with success to the channel.
 	assert!(nodes[0].node.list_usable_channels().is_empty());
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let retry_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
 
 	nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &retry_reestablish[0]);
@@ -791,9 +815,13 @@ fn do_test_partial_claim_before_restart(persist_both_monitors: bool) {
 	if !persist_both_monitors {
 		// If one of the two channels is still live, reveal the payment preimage over it.
 
-		nodes[3].node.peer_connected(&nodes[2].node.get_our_node_id(), &msgs::Init { features: nodes[2].node.init_features(), remote_network_address: None }, true).unwrap();
+		nodes[3].node.peer_connected(&nodes[2].node.get_our_node_id(), &msgs::Init {
+			features: nodes[2].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 		let reestablish_1 = get_chan_reestablish_msgs!(nodes[3], nodes[2]);
-		nodes[2].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init { features: nodes[3].node.init_features(), remote_network_address: None }, false).unwrap();
+		nodes[2].node.peer_connected(&nodes[3].node.get_our_node_id(), &msgs::Init {
+			features: nodes[3].node.init_features(), networks: None, remote_network_address: None
+		}, false).unwrap();
 		let reestablish_2 = get_chan_reestablish_msgs!(nodes[2], nodes[3]);
 
 		nodes[2].node.handle_channel_reestablish(&nodes[3].node.get_our_node_id(), &reestablish_1[0]);
diff --git a/lightning/src/ln/reorg_tests.rs b/lightning/src/ln/reorg_tests.rs
index ea575ac5f..be756840a 100644
--- a/lightning/src/ln/reorg_tests.rs
+++ b/lightning/src/ln/reorg_tests.rs
@@ -362,7 +362,9 @@ fn do_test_unconf_chan(reload_node: bool, reorg_after_reload: bool, use_funding_
 		// If we dropped the channel before reloading the node, nodes[1] was also dropped from
 		// nodes[0] storage, and hence not connected again on startup. We therefore need to
 		// reconnect to the node before attempting to create a new channel.
-		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+		nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &Init {
+			features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+		}, true).unwrap();
 	}
 	create_announced_chan_between_nodes(&nodes, 0, 1);
 	send_payment(&nodes[0], &[&nodes[1]], 8000000);
diff --git a/lightning/src/ln/shutdown_tests.rs b/lightning/src/ln/shutdown_tests.rs
index 1063bf76c..d3823fc8f 100644
--- a/lightning/src/ln/shutdown_tests.rs
+++ b/lightning/src/ln/shutdown_tests.rs
@@ -252,9 +252,13 @@ fn do_test_shutdown_rebroadcast(recv_count: u8) {
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let node_0_reestablish = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	let node_1_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
 
 	nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &node_0_reestablish);
@@ -314,9 +318,13 @@ fn do_test_shutdown_rebroadcast(recv_count: u8) {
 	nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id());
 	nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id());
 
-	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init { features: nodes[0].node.init_features(), remote_network_address: None }, true).unwrap();
+	nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id(), &msgs::Init {
+		features: nodes[0].node.init_features(), networks: None, remote_network_address: None
+	}, true).unwrap();
 	let node_1_2nd_reestablish = get_chan_reestablish_msgs!(nodes[1], nodes[0]).pop().unwrap();
-	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init { features: nodes[1].node.init_features(), remote_network_address: None }, false).unwrap();
+	nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id(), &msgs::Init {
+		features: nodes[1].node.init_features(), networks: None, remote_network_address: None
+	}, false).unwrap();
 	if recv_count == 0 {
 		// If all closing_signeds weren't delivered we can just resume where we left off...
 		let node_0_2nd_reestablish = get_chan_reestablish_msgs!(nodes[0], nodes[1]).pop().unwrap();
diff --git a/lightning/src/onion_message/functional_tests.rs b/lightning/src/onion_message/functional_tests.rs
index 98fcdb680..96e0c44b2 100644
--- a/lightning/src/onion_message/functional_tests.rs
+++ b/lightning/src/onion_message/functional_tests.rs
@@ -110,7 +110,7 @@ fn create_nodes(num_messengers: u8) -> Vec<MessengerNode> {
 		let i = idx as usize;
 		let mut features = InitFeatures::empty();
 		features.set_onion_messages_optional();
-		let init_msg = msgs::Init { features, remote_network_address: None };
+		let init_msg = msgs::Init { features, networks: None, remote_network_address: None };
 		nodes[i].messenger.peer_connected(&nodes[i + 1].get_node_pk(), &init_msg.clone(), true).unwrap();
 		nodes[i + 1].messenger.peer_connected(&nodes[i].get_node_pk(), &init_msg.clone(), false).unwrap();
 	}
diff --git a/lightning/src/routing/gossip.rs b/lightning/src/routing/gossip.rs
index 5ac2f9ed6..dc6aeb940 100644
--- a/lightning/src/routing/gossip.rs
+++ b/lightning/src/routing/gossip.rs
@@ -2895,7 +2895,7 @@ pub(crate) mod tests {
 
 		// It should ignore if gossip_queries feature is not enabled
 		{
-			let init_msg = Init { features: InitFeatures::empty(), remote_network_address: None };
+			let init_msg = Init { features: InitFeatures::empty(), networks: None, remote_network_address: None };
 			gossip_sync.peer_connected(&node_id_1, &init_msg, true).unwrap();
 			let events = gossip_sync.get_and_clear_pending_msg_events();
 			assert_eq!(events.len(), 0);
@@ -2905,7 +2905,7 @@ pub(crate) mod tests {
 		{
 			let mut features = InitFeatures::empty();
 			features.set_gossip_queries_optional();
-			let init_msg = Init { features, remote_network_address: None };
+			let init_msg = Init { features, networks: None, remote_network_address: None };
 			gossip_sync.peer_connected(&node_id_1, &init_msg, true).unwrap();
 			let events = gossip_sync.get_and_clear_pending_msg_events();
 			assert_eq!(events.len(), 1);
-- 
2.39.5