X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fln%2Fmsgs.rs;h=281a2a8e977123158f5daeba45ff8666c96ec403;hb=384c4dc7753e4b7ac53ea380e52809babd8f0f9b;hp=f94909a9ae5499c35a5c6f5719c1705ede98ed91;hpb=803d8041f143469993620ed75e84cba226b860fa;p=rust-lightning

diff --git a/lightning/src/ln/msgs.rs b/lightning/src/ln/msgs.rs
index f94909a9..8b5a6ac6 100644
--- a/lightning/src/ln/msgs.rs
+++ b/lightning/src/ln/msgs.rs
@@ -24,31 +24,33 @@
 //! 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::secp256k1::key::PublicKey;
-use bitcoin::secp256k1::Signature;
+use bitcoin::secp256k1::PublicKey;
+use bitcoin::secp256k1::ecdsa::Signature;
 use bitcoin::secp256k1;
 use bitcoin::blockdata::script::Script;
 use bitcoin::hash_types::{Txid, BlockHash};
 
-use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
+use crate::ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
+use crate::ln::onion_utils;
+use crate::onion_message;
 
-use prelude::*;
-use core::{cmp, fmt};
+use crate::prelude::*;
+use core::fmt;
 use core::fmt::Debug;
-use io::{self, Read};
-use io_extras::read_to_end;
+use crate::io::{self, Read};
+use crate::io_extras::read_to_end;
 
-use util::events::MessageSendEventsProvider;
-use util::logger;
-use util::ser::{Readable, Writeable, Writer, FixedLengthReader, HighZeroBytesDroppedVarInt};
+use crate::util::events::{MessageSendEventsProvider, OnionMessageProvider};
+use crate::util::logger;
+use crate::util::ser::{BigSize, LengthReadable, Readable, ReadableArgs, Writeable, Writer, FixedLengthReader, HighZeroBytesDroppedBigSize, Hostname};
 
-use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
+use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
 
 /// 21 million * 10^8 * 1000
 pub(crate) const MAX_VALUE_MSAT: u64 = 21_000_000_0000_0000_000;
 
 /// An error in decoding a message or struct.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum DecodeError {
 	/// A version byte specified something we don't know how to handle.
 	/// Includes unknown realm byte in an OnionHopData packet
@@ -64,33 +66,54 @@ pub enum DecodeError {
 	/// A length descriptor in the packet didn't describe the later data correctly
 	BadLengthDescriptor,
 	/// Error from std::io
-	Io(/// (C-not exported) as ErrorKind doesn't have a reasonable mapping
-        io::ErrorKind),
+	Io(io::ErrorKind),
 	/// The message included zlib-compressed values, which we don't support.
 	UnsupportedCompression,
 }
 
 /// An init message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Init {
 	/// The relevant features which the sender supports
 	pub features: InitFeatures,
+	/// The receipient's network address. This adds the option to report a remote IP address
+	/// back to a connecting peer using the init message. A node can decide to use that information
+	/// to discover a potential update to its public IPv4 address (NAT) and use
+	/// that for a node_announcement update message containing the new address.
+	pub remote_network_address: Option<NetAddress>,
 }
 
 /// An error message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ErrorMessage {
-	/// The channel ID involved in the error
+	/// The channel ID involved in the error.
+	///
+	/// All-0s indicates a general error unrelated to a specific channel, after which all channels
+	/// with the sending peer should be closed.
 	pub channel_id: [u8; 32],
 	/// A possibly human-readable error description.
-	/// The string should be sanitized before it is used (e.g. emitted to logs
-	/// or printed to stdout).  Otherwise, a well crafted error message may trigger a security
-	/// vulnerability in the terminal emulator or the logging subsystem.
+	/// The string should be sanitized before it is used (e.g. emitted to logs or printed to
+	/// stdout). Otherwise, a well crafted error message may trigger a security vulnerability in
+	/// the terminal emulator or the logging subsystem.
+	pub data: String,
+}
+
+/// A warning message to be sent or received from a peer
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct WarningMessage {
+	/// The channel ID involved in the warning.
+	///
+	/// All-0s indicates a warning unrelated to a specific channel.
+	pub channel_id: [u8; 32],
+	/// A possibly human-readable warning description.
+	/// The string should be sanitized before it is used (e.g. emitted to logs or printed to
+	/// stdout). Otherwise, a well crafted error message may trigger a security vulnerability in
+	/// the terminal emulator or the logging subsystem.
 	pub data: String,
 }
 
 /// A ping message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Ping {
 	/// The desired response length
 	pub ponglen: u16,
@@ -100,7 +123,7 @@ pub struct Ping {
 }
 
 /// A pong message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Pong {
 	/// The pong packet size.
 	/// This field is not sent on the wire. byteslen zeros are sent.
@@ -108,7 +131,7 @@ pub struct Pong {
 }
 
 /// An open_channel message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct OpenChannel {
 	/// The genesis hash of the blockchain where the channel is to be opened
 	pub chain_hash: BlockHash,
@@ -148,10 +171,14 @@ pub struct OpenChannel {
 	pub channel_flags: u8,
 	/// Optionally, a request to pre-set the to-sender output's scriptPubkey for when we collaboratively close
 	pub shutdown_scriptpubkey: OptionalField<Script>,
+	/// The channel type that this channel will represent. If none is set, we derive the channel
+	/// type from the intersection of our feature bits with our counterparty's feature bits from
+	/// the Init message.
+	pub channel_type: Option<ChannelTypeFeatures>,
 }
 
 /// An accept_channel message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct AcceptChannel {
 	/// A temporary channel ID, until the funding outpoint is announced
 	pub temporary_channel_id: [u8; 32],
@@ -183,10 +210,16 @@ pub struct AcceptChannel {
 	pub first_per_commitment_point: PublicKey,
 	/// Optionally, a request to pre-set the to-sender output's scriptPubkey for when we collaboratively close
 	pub shutdown_scriptpubkey: OptionalField<Script>,
+	/// The channel type that this channel will represent. If none is set, we derive the channel
+	/// type from the intersection of our feature bits with our counterparty's feature bits from
+	/// the Init message.
+	///
+	/// This is required to match the equivalent field in [`OpenChannel::channel_type`].
+	pub channel_type: Option<ChannelTypeFeatures>,
 }
 
 /// A funding_created message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct FundingCreated {
 	/// A temporary channel ID, until the funding is established
 	pub temporary_channel_id: [u8; 32],
@@ -194,30 +227,33 @@ pub struct FundingCreated {
 	pub funding_txid: Txid,
 	/// The specific output index funding this channel
 	pub funding_output_index: u16,
-	/// The signature of the channel initiator (funder) on the funding transaction
+	/// The signature of the channel initiator (funder) on the initial commitment transaction
 	pub signature: Signature,
 }
 
 /// A funding_signed message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct FundingSigned {
 	/// The channel ID
 	pub channel_id: [u8; 32],
-	/// The signature of the channel acceptor (fundee) on the funding transaction
+	/// The signature of the channel acceptor (fundee) on the initial commitment transaction
 	pub signature: Signature,
 }
 
-/// A funding_locked message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
-pub struct FundingLocked {
+/// A channel_ready message to be sent or received from a peer
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct ChannelReady {
 	/// The channel ID
 	pub channel_id: [u8; 32],
 	/// The per-commitment point of the second commitment transaction
 	pub next_per_commitment_point: PublicKey,
+	/// If set, provides a short_channel_id alias for this channel. The sender will accept payments
+	/// to be forwarded over this SCID and forward them to this messages' recipient.
+	pub short_channel_id_alias: Option<u64>,
 }
 
 /// A shutdown message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Shutdown {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -229,7 +265,7 @@ pub struct Shutdown {
 /// The minimum and maximum fees which the sender is willing to place on the closing transaction.
 /// This is provided in [`ClosingSigned`] by both sides to indicate the fee range they are willing
 /// to use.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ClosingSignedFeeRange {
 	/// The minimum absolute fee, in satoshis, which the sender is willing to place on the closing
 	/// transaction.
@@ -240,7 +276,7 @@ pub struct ClosingSignedFeeRange {
 }
 
 /// A closing_signed message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ClosingSigned {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -254,7 +290,7 @@ pub struct ClosingSigned {
 }
 
 /// An update_add_htlc message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UpdateAddHTLC {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -269,8 +305,16 @@ pub struct UpdateAddHTLC {
 	pub(crate) onion_routing_packet: OnionPacket,
 }
 
+ /// An onion message to be sent or received from a peer
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct OnionMessage {
+	/// Used in decrypting the onion packet's payload.
+	pub blinding_point: PublicKey,
+	pub(crate) onion_routing_packet: onion_message::Packet,
+}
+
 /// An update_fulfill_htlc message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UpdateFulfillHTLC {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -281,7 +325,7 @@ pub struct UpdateFulfillHTLC {
 }
 
 /// An update_fail_htlc message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UpdateFailHTLC {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -291,7 +335,7 @@ pub struct UpdateFailHTLC {
 }
 
 /// An update_fail_malformed_htlc message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UpdateFailMalformedHTLC {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -303,7 +347,7 @@ pub struct UpdateFailMalformedHTLC {
 }
 
 /// A commitment_signed message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CommitmentSigned {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -314,7 +358,7 @@ pub struct CommitmentSigned {
 }
 
 /// A revoke_and_ack message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct RevokeAndACK {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -325,7 +369,7 @@ pub struct RevokeAndACK {
 }
 
 /// An update_fee message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UpdateFee {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -333,7 +377,7 @@ pub struct UpdateFee {
 	pub feerate_per_kw: u32,
 }
 
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 /// Proof that the sender knows the per-commitment secret of the previous commitment transaction.
 /// This is used to convince the recipient that the channel is at a certain commitment
 /// number even if they lost that data due to a local failure.  Of course, the peer may lie
@@ -347,7 +391,7 @@ pub struct DataLossProtect {
 }
 
 /// A channel_reestablish message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ChannelReestablish {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -360,7 +404,7 @@ pub struct ChannelReestablish {
 }
 
 /// An announcement_signatures message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct AnnouncementSignatures {
 	/// The channel ID
 	pub channel_id: [u8; 32],
@@ -373,7 +417,7 @@ pub struct AnnouncementSignatures {
 }
 
 /// An address which can be used to connect to a remote peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum NetAddress {
 	/// An IPv4 address/port on which the peer is listening.
 	IPv4 {
@@ -390,12 +434,10 @@ pub enum NetAddress {
 		port: u16,
 	},
 	/// An old-style Tor onion address/port on which the peer is listening.
-	OnionV2 {
-		/// The bytes (usually encoded in base32 with ".onion" appended)
-		addr: [u8; 10],
-		/// The port on which the node is listening
-		port: u16,
-	},
+	///
+	/// This field is deprecated and the Tor network generally no longer supports V2 Onion
+	/// addresses. Thus, the details are not parsed here.
+	OnionV2([u8; 12]),
 	/// A new-style Tor onion address/port on which the peer is listening.
 	/// To create the human-readable "hostname", concatenate ed25519_pubkey, checksum, and version,
 	/// wrap as base32 and append ".onion".
@@ -409,6 +451,13 @@ pub enum NetAddress {
 		/// The port on which the node is listening
 		port: u16,
 	},
+	/// A hostname/port on which the peer is listening.
+	Hostname {
+		/// The hostname on which the node is listening.
+		hostname: Hostname,
+		/// The port on which the node is listening.
+		port: u16,
+	},
 }
 impl NetAddress {
 	/// Gets the ID of this address type. Addresses in node_announcement messages should be sorted
@@ -417,8 +466,9 @@ impl NetAddress {
 		match self {
 			&NetAddress::IPv4 {..} => { 1 },
 			&NetAddress::IPv6 {..} => { 2 },
-			&NetAddress::OnionV2 {..} => { 3 },
+			&NetAddress::OnionV2(_) => { 3 },
 			&NetAddress::OnionV3 {..} => { 4 },
+			&NetAddress::Hostname {..} => { 5 },
 		}
 	}
 
@@ -427,13 +477,17 @@ impl NetAddress {
 		match self {
 			&NetAddress::IPv4 { .. } => { 6 },
 			&NetAddress::IPv6 { .. } => { 18 },
-			&NetAddress::OnionV2 { .. } => { 12 },
+			&NetAddress::OnionV2(_) => { 12 },
 			&NetAddress::OnionV3 { .. } => { 37 },
+			// Consists of 1-byte hostname length, hostname bytes, and 2-byte port.
+			&NetAddress::Hostname { ref hostname, .. } => { u16::from(hostname.len()) + 3 },
 		}
 	}
 
-	/// The maximum length of any address descriptor, not including the 1-byte type
-	pub(crate) const MAX_LEN: u16 = 37;
+	/// The maximum length of any address descriptor, not including the 1-byte type.
+	/// This maximum length is reached by a hostname address descriptor:
+	/// a hostname with a maximum length of 255, its 1-byte length and a 2-byte port.
+	pub(crate) const MAX_LEN: u16 = 258;
 }
 
 impl Writeable for NetAddress {
@@ -449,10 +503,9 @@ impl Writeable for NetAddress {
 				addr.write(writer)?;
 				port.write(writer)?;
 			},
-			&NetAddress::OnionV2 { ref addr, ref port } => {
+			&NetAddress::OnionV2(bytes) => {
 				3u8.write(writer)?;
-				addr.write(writer)?;
-				port.write(writer)?;
+				bytes.write(writer)?;
 			},
 			&NetAddress::OnionV3 { ref ed25519_pubkey, ref checksum, ref version, ref port } => {
 				4u8.write(writer)?;
@@ -460,7 +513,12 @@ impl Writeable for NetAddress {
 				checksum.write(writer)?;
 				version.write(writer)?;
 				port.write(writer)?;
-			}
+			},
+			&NetAddress::Hostname { ref hostname, ref port } => {
+				5u8.write(writer)?;
+				hostname.write(writer)?;
+				port.write(writer)?;
+			},
 		}
 		Ok(())
 	}
@@ -482,12 +540,7 @@ impl Readable for Result<NetAddress, u8> {
 					port: Readable::read(reader)?,
 				}))
 			},
-			3 => {
-				Ok(Ok(NetAddress::OnionV2 {
-					addr: Readable::read(reader)?,
-					port: Readable::read(reader)?,
-				}))
-			},
+			3 => Ok(Ok(NetAddress::OnionV2(Readable::read(reader)?))),
 			4 => {
 				Ok(Ok(NetAddress::OnionV3 {
 					ed25519_pubkey: Readable::read(reader)?,
@@ -496,6 +549,12 @@ impl Readable for Result<NetAddress, u8> {
 					port: Readable::read(reader)?,
 				}))
 			},
+			5 => {
+				Ok(Ok(NetAddress::Hostname {
+					hostname: Readable::read(reader)?,
+					port: Readable::read(reader)?,
+				}))
+			},
 			_ => return Ok(Err(byte)),
 		}
 	}
@@ -513,7 +572,7 @@ impl Readable for NetAddress {
 
 
 /// The unsigned part of a node_announcement
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UnsignedNodeAnnouncement {
 	/// The advertised features
 	pub features: NodeFeatures,
@@ -532,7 +591,7 @@ pub struct UnsignedNodeAnnouncement {
 	pub(crate) excess_address_data: Vec<u8>,
 	pub(crate) excess_data: Vec<u8>,
 }
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 /// A node_announcement message to be sent or received from a peer
 pub struct NodeAnnouncement {
 	/// The signature by the node key
@@ -542,7 +601,7 @@ pub struct NodeAnnouncement {
 }
 
 /// The unsigned part of a channel_announcement
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UnsignedChannelAnnouncement {
 	/// The advertised channel features
 	pub features: ChannelFeatures,
@@ -561,7 +620,7 @@ pub struct UnsignedChannelAnnouncement {
 	pub(crate) excess_data: Vec<u8>,
 }
 /// A channel_announcement message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ChannelAnnouncement {
 	/// Authentication of the announcement by the first public node
 	pub node_signature_1: Signature,
@@ -576,7 +635,7 @@ pub struct ChannelAnnouncement {
 }
 
 /// The unsigned part of a channel_update
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct UnsignedChannelUpdate {
 	/// The genesis hash of the blockchain where the channel is to be opened
 	pub chain_hash: BlockHash,
@@ -597,16 +656,19 @@ pub struct UnsignedChannelUpdate {
 	pub cltv_expiry_delta: u16,
 	/// The minimum HTLC size incoming to sender, in milli-satoshi
 	pub htlc_minimum_msat: u64,
-	/// Optionally, the maximum HTLC value incoming to sender, in milli-satoshi
-	pub htlc_maximum_msat: OptionalField<u64>,
+	/// The maximum HTLC value incoming to sender, in milli-satoshi. Used to be optional.
+	pub htlc_maximum_msat: u64,
 	/// The base HTLC fee charged by sender, in milli-satoshi
 	pub fee_base_msat: u32,
 	/// The amount to fee multiplier, in micro-satoshi
 	pub fee_proportional_millionths: u32,
-	pub(crate) excess_data: Vec<u8>,
+	/// Excess data which was signed as a part of the message which we do not (yet) understand how
+	/// to decode. This is stored to ensure forward-compatibility as new fields are added to the
+	/// lightning gossip
+	pub excess_data: Vec<u8>,
 }
 /// A channel_update message to be sent or received from a peer
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ChannelUpdate {
 	/// A signature of the channel update
 	pub signature: Signature,
@@ -618,7 +680,7 @@ pub struct ChannelUpdate {
 /// UTXOs in a range of blocks. The recipient of a query makes a best
 /// effort to reply to the query using one or more reply_channel_range
 /// messages.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct QueryChannelRange {
 	/// The genesis hash of the blockchain being queried
 	pub chain_hash: BlockHash,
@@ -635,7 +697,7 @@ pub struct QueryChannelRange {
 /// not be a perfect view of the network. The short_channel_ids in the
 /// reply are encoded. We only support encoding_type=0 uncompressed
 /// serialization and do not support encoding_type=1 zlib serialization.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ReplyChannelRange {
 	/// The genesis hash of the blockchain being queried
 	pub chain_hash: BlockHash,
@@ -657,7 +719,7 @@ pub struct ReplyChannelRange {
 /// reply_short_channel_ids_end message. The short_channel_ids sent in
 /// this query are encoded. We only support encoding_type=0 uncompressed
 /// serialization and do not support encoding_type=1 zlib serialization.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct QueryShortChannelIds {
 	/// The genesis hash of the blockchain being queried
 	pub chain_hash: BlockHash,
@@ -669,7 +731,7 @@ pub struct QueryShortChannelIds {
 /// query_short_channel_ids message. The query recipient makes a best
 /// effort to respond based on their local network view which may not be
 /// a perfect view of the network.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ReplyShortChannelIdsEnd {
 	/// The genesis hash of the blockchain that was queried
 	pub chain_hash: BlockHash,
@@ -681,7 +743,7 @@ pub struct ReplyShortChannelIdsEnd {
 /// A gossip_timestamp_filter message is used by a node to request
 /// gossip relay for messages in the requested time range when the
 /// gossip_queries feature has been negotiated.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct GossipTimestampFilter {
 	/// The genesis hash of the blockchain for channel and node information
 	pub chain_hash: BlockHash,
@@ -711,10 +773,23 @@ pub enum ErrorAction {
 	/// The peer did something harmless that we weren't able to meaningfully process.
 	/// If the error is logged, log it at the given level.
 	IgnoreAndLog(logger::Level),
+	/// The peer provided us with a gossip message which we'd already seen. In most cases this
+	/// should be ignored, but it may result in the message being forwarded if it is a duplicate of
+	/// our own channel announcements.
+	IgnoreDuplicateGossip,
 	/// The peer did something incorrect. Tell them.
 	SendErrorMessage {
 		/// The message to send.
-		msg: ErrorMessage
+		msg: ErrorMessage,
+	},
+	/// The peer did something incorrect. Tell them without closing any channels.
+	SendWarningMessage {
+		/// The message to send.
+		msg: WarningMessage,
+		/// The peer may have done something harmless that we weren't able to meaningfully process,
+		/// though we should still tell them about it.
+		/// If this event is logged, log it at the given level.
+		log_level: logger::Level,
 	},
 }
 
@@ -729,7 +804,7 @@ pub struct LightningError {
 
 /// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
 /// transaction updates if they were pending.
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct CommitmentUpdate {
 	/// update_add_htlc messages which should be sent
 	pub update_add_htlcs: Vec<UpdateAddHTLC>,
@@ -745,41 +820,12 @@ pub struct CommitmentUpdate {
 	pub commitment_signed: CommitmentSigned,
 }
 
-/// The information we received from a peer along the route of a payment we originated. This is
-/// returned by ChannelMessageHandler::handle_update_fail_htlc to be passed into
-/// RoutingMessageHandler::handle_htlc_fail_channel_update to update our network map.
-#[derive(Clone, Debug, PartialEq)]
-pub enum HTLCFailChannelUpdate {
-	/// We received an error which included a full ChannelUpdate message.
-	ChannelUpdateMessage {
-		/// The unwrapped message we received
-		msg: ChannelUpdate,
-	},
-	/// We received an error which indicated only that a channel has been closed
-	ChannelClosed {
-		/// The short_channel_id which has now closed.
-		short_channel_id: u64,
-		/// when this true, this channel should be permanently removed from the
-		/// consideration. Otherwise, this channel can be restored as new channel_update is received
-		is_permanent: bool,
-	},
-	/// We received an error which indicated only that a node has failed
-	NodeFailure {
-		/// The node_id that has failed.
-		node_id: PublicKey,
-		/// when this true, node should be permanently removed from the
-		/// consideration. Otherwise, the channels connected to this node can be
-		/// restored as new channel_update is received
-		is_permanent: bool,
-	}
-}
-
 /// Messages could have optional fields to use with extended features
 /// As we wish to serialize these differently from Option<T>s (Options get a tag byte, but
 /// OptionalFeild simply gets Present if there are enough bytes to read into it), we have a
 /// separate enum type for them.
 /// (C-not exported) due to a free generic in T
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum OptionalField<T> {
 	/// Optional field is included in message
 	Present(T),
@@ -801,8 +847,8 @@ pub trait ChannelMessageHandler : MessageSendEventsProvider {
 	fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated);
 	/// Handle an incoming funding_signed message from the given peer.
 	fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned);
-	/// Handle an incoming funding_locked message from the given peer.
-	fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked);
+	/// Handle an incoming channel_ready message from the given peer.
+	fn handle_channel_ready(&self, their_node_id: &PublicKey, msg: &ChannelReady);
 
 	// Channl close:
 	/// Handle an incoming shutdown message from the given peer.
@@ -836,10 +882,17 @@ pub trait ChannelMessageHandler : MessageSendEventsProvider {
 	/// is believed to be possible in the future (eg they're sending us messages we don't
 	/// understand or indicate they require unknown feature bits), no_connection_possible is set
 	/// and any outstanding channels should be failed.
+	///
+	/// Note that in some rare cases this may be called without a corresponding
+	/// [`Self::peer_connected`].
 	fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
 
 	/// Handle a peer reconnecting, possibly generating channel_reestablish message(s).
-	fn peer_connected(&self, their_node_id: &PublicKey, msg: &Init);
+	///
+	/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
+	/// with us. Implementors should be somewhat conservative about doing so, however, as other
+	/// message handlers may still wish to communicate with this peer.
+	fn peer_connected(&self, their_node_id: &PublicKey, msg: &Init) -> Result<(), ()>;
 	/// Handle an incoming channel_reestablish message from the given peer.
 	fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &ChannelReestablish);
 
@@ -849,6 +902,19 @@ pub trait ChannelMessageHandler : MessageSendEventsProvider {
 	// Error:
 	/// Handle an incoming error message from the given peer.
 	fn handle_error(&self, their_node_id: &PublicKey, msg: &ErrorMessage);
+
+	// Handler information:
+	/// Gets the node feature flags which this handler itself supports. All available handlers are
+	/// queried similarly and their feature flags are OR'd together to form the [`NodeFeatures`]
+	/// which are broadcasted in our [`NodeAnnouncement`] message.
+	fn provided_node_features(&self) -> NodeFeatures;
+
+	/// Gets the init feature flags which should be sent to the given peer. All available handlers
+	/// are queried similarly and their feature flags are OR'd together to form the [`InitFeatures`]
+	/// which are sent in our [`Init`] message.
+	///
+	/// Note that this method is called before [`Self::peer_connected`].
+	fn provided_init_features(&self, their_node_id: &PublicKey) -> InitFeatures;
 }
 
 /// A trait to describe an object which can receive routing messages.
@@ -868,21 +934,23 @@ pub trait RoutingMessageHandler : MessageSendEventsProvider {
 	/// Handle an incoming channel_update message, returning true if it should be forwarded on,
 	/// false or returning an Err otherwise.
 	fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<bool, LightningError>;
-	/// Handle some updates to the route graph that we learned due to an outbound failed payment.
-	fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
-	/// Gets a subset of the channel announcements and updates required to dump our routing table
-	/// to a remote node, starting at the short_channel_id indicated by starting_point and
-	/// including the batch_amount entries immediately higher in numerical value than starting_point.
-	fn get_next_channel_announcements(&self, starting_point: u64, batch_amount: u8) -> Vec<(ChannelAnnouncement, Option<ChannelUpdate>, Option<ChannelUpdate>)>;
-	/// Gets a subset of the node announcements required to dump our routing table to a remote node,
-	/// starting at the node *after* the provided publickey and including batch_amount entries
-	/// immediately higher (as defined by <PublicKey as Ord>::cmp) than starting_point.
+	/// Gets channel announcements and updates required to dump our routing table to a remote node,
+	/// starting at the short_channel_id indicated by starting_point and including announcements
+	/// for a single channel.
+	fn get_next_channel_announcement(&self, starting_point: u64) -> Option<(ChannelAnnouncement, Option<ChannelUpdate>, Option<ChannelUpdate>)>;
+	/// Gets a node announcement required to dump our routing table to a remote node, starting at
+	/// the node *after* the provided pubkey and including up to one announcement immediately
+	/// higher (as defined by <PublicKey as Ord>::cmp) than starting_point.
 	/// If None is provided for starting_point, we start at the first node.
-	fn get_next_node_announcements(&self, starting_point: Option<&PublicKey>, batch_amount: u8) -> Vec<NodeAnnouncement>;
+	fn get_next_node_announcement(&self, starting_point: Option<&PublicKey>) -> Option<NodeAnnouncement>;
 	/// Called when a connection is established with a peer. This can be used to
 	/// perform routing table synchronization using a strategy defined by the
 	/// implementor.
-	fn sync_routing_table(&self, their_node_id: &PublicKey, init: &Init);
+	///
+	/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
+	/// with us. Implementors should be somewhat conservative about doing so, however, as other
+	/// message handlers may still wish to communicate with this peer.
+	fn peer_connected(&self, their_node_id: &PublicKey, init: &Init) -> Result<(), ()>;
 	/// Handles the reply of a query we initiated to learn about channels
 	/// for a given range of blocks. We can expect to receive one or more
 	/// replies to a single query.
@@ -898,11 +966,55 @@ pub trait RoutingMessageHandler : MessageSendEventsProvider {
 	/// Handles when a peer asks us to send routing gossip messages for a
 	/// list of short_channel_ids.
 	fn handle_query_short_channel_ids(&self, their_node_id: &PublicKey, msg: QueryShortChannelIds) -> Result<(), LightningError>;
+
+	// Handler information:
+	/// Gets the node feature flags which this handler itself supports. All available handlers are
+	/// queried similarly and their feature flags are OR'd together to form the [`NodeFeatures`]
+	/// which are broadcasted in our [`NodeAnnouncement`] message.
+	fn provided_node_features(&self) -> NodeFeatures;
+	/// Gets the init feature flags which should be sent to the given peer. All available handlers
+	/// are queried similarly and their feature flags are OR'd together to form the [`InitFeatures`]
+	/// which are sent in our [`Init`] message.
+	///
+	/// Note that this method is called before [`Self::peer_connected`].
+	fn provided_init_features(&self, their_node_id: &PublicKey) -> InitFeatures;
+}
+
+/// A trait to describe an object that can receive onion messages.
+pub trait OnionMessageHandler : OnionMessageProvider {
+	/// Handle an incoming onion_message message from the given peer.
+	fn handle_onion_message(&self, peer_node_id: &PublicKey, msg: &OnionMessage);
+	/// Called when a connection is established with a peer. Can be used to track which peers
+	/// advertise onion message support and are online.
+	///
+	/// May return an `Err(())` if the features the peer supports are not sufficient to communicate
+	/// with us. Implementors should be somewhat conservative about doing so, however, as other
+	/// message handlers may still wish to communicate with this peer.
+	fn peer_connected(&self, their_node_id: &PublicKey, init: &Init) -> Result<(), ()>;
+	/// Indicates a connection to the peer failed/an existing connection was lost. Allows handlers to
+	/// drop and refuse to forward onion messages to this peer.
+	///
+	/// Note that in some rare cases this may be called without a corresponding
+	/// [`Self::peer_connected`].
+	fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);
+
+	// Handler information:
+	/// Gets the node feature flags which this handler itself supports. All available handlers are
+	/// queried similarly and their feature flags are OR'd together to form the [`NodeFeatures`]
+	/// which are broadcasted in our [`NodeAnnouncement`] message.
+	fn provided_node_features(&self) -> NodeFeatures;
+
+	/// Gets the init feature flags which should be sent to the given peer. All available handlers
+	/// are queried similarly and their feature flags are OR'd together to form the [`InitFeatures`]
+	/// which are sent in our [`Init`] message.
+	///
+	/// Note that this method is called before [`Self::peer_connected`].
+	fn provided_init_features(&self, their_node_id: &PublicKey) -> InitFeatures;
 }
 
 mod fuzzy_internal_msgs {
-	use prelude::*;
-	use ln::{PaymentPreimage, PaymentSecret};
+	use crate::prelude::*;
+	use crate::ln::{PaymentPreimage, PaymentSecret};
 
 	// These types aren't intended to be pub, but are exposed for direct fuzzing (as we deserialize
 	// them from untrusted input):
@@ -942,9 +1054,9 @@ mod fuzzy_internal_msgs {
 		pub(crate) pad: Vec<u8>,
 	}
 }
-#[cfg(feature = "fuzztarget")]
+#[cfg(fuzzing)]
 pub use self::fuzzy_internal_msgs::*;
-#[cfg(not(feature = "fuzztarget"))]
+#[cfg(not(fuzzing))]
 pub(crate) use self::fuzzy_internal_msgs::*;
 
 #[derive(Clone)]
@@ -958,6 +1070,19 @@ pub(crate) struct OnionPacket {
 	pub(crate) hmac: [u8; 32],
 }
 
+impl onion_utils::Packet for OnionPacket {
+	type Data = onion_utils::FixedSizeOnionPacket;
+	fn new(pubkey: PublicKey, hop_data: onion_utils::FixedSizeOnionPacket, hmac: [u8; 32]) -> Self {
+		Self {
+			version: 0,
+			public_key: Ok(pubkey),
+			hop_data: hop_data.0,
+			hmac,
+		}
+	}
+}
+
+impl Eq for OnionPacket { }
 impl PartialEq for OnionPacket {
 	fn eq(&self, other: &OnionPacket) -> bool {
 		for (i, j) in self.hop_data.iter().zip(other.hop_data.iter()) {
@@ -975,7 +1100,7 @@ impl fmt::Debug for OnionPacket {
 	}
 }
 
-#[derive(Clone, Debug, PartialEq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub(crate) struct OnionErrorPacket {
 	// This really should be a constant size slice, but the spec lets these things be up to 128KB?
 	// (TODO) We limit it in decode to much lower...
@@ -990,7 +1115,7 @@ impl fmt::Display for DecodeError {
 			DecodeError::InvalidValue => f.write_str("Nonsense bytes didn't map to the type they were interpreted as"),
 			DecodeError::ShortRead => f.write_str("Packet extended beyond the provided bytes"),
 			DecodeError::BadLengthDescriptor => f.write_str("A length descriptor in the packet didn't describe the later data correctly"),
-			DecodeError::Io(ref e) => e.fmt(f),
+			DecodeError::Io(ref e) => fmt::Debug::fmt(e, f),
 			DecodeError::UnsupportedCompression => f.write_str("We don't support receiving messages with zlib-compressed fields"),
 		}
 	}
@@ -1053,10 +1178,7 @@ impl Readable for OptionalField<u64> {
 }
 
 
-impl_writeable_len_match!(AcceptChannel, {
-		{AcceptChannel{ shutdown_scriptpubkey: OptionalField::Present(ref script), .. }, 270 + 2 + script.len()},
-		{_, 270}
-	}, {
+impl_writeable_msg!(AcceptChannel, {
 	temporary_channel_id,
 	dust_limit_satoshis,
 	max_htlc_value_in_flight_msat,
@@ -1072,18 +1194,19 @@ impl_writeable_len_match!(AcceptChannel, {
 	htlc_basepoint,
 	first_per_commitment_point,
 	shutdown_scriptpubkey
+}, {
+	(1, channel_type, option),
 });
 
-impl_writeable!(AnnouncementSignatures, 32+8+64*2, {
+impl_writeable_msg!(AnnouncementSignatures, {
 	channel_id,
 	short_channel_id,
 	node_signature,
 	bitcoin_signature
-});
+}, {});
 
 impl Writeable for ChannelReestablish {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(if let OptionalField::Present(..) = self.data_loss_protect { 32+2*8+33+32 } else { 32+2*8 });
 		self.channel_id.write(w)?;
 		self.next_local_commitment_number.write(w)?;
 		self.next_remote_commitment_number.write(w)?;
@@ -1119,68 +1242,45 @@ impl Readable for ChannelReestablish{
 	}
 }
 
-impl Writeable for ClosingSigned {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(32 + 8 + 64 + if self.fee_range.is_some() { 1+1+ 2*8 } else { 0 });
-		self.channel_id.write(w)?;
-		self.fee_satoshis.write(w)?;
-		self.signature.write(w)?;
-		encode_tlv_stream!(w, {
-			(1, self.fee_range, option),
-		});
-		Ok(())
-	}
-}
-
-impl Readable for ClosingSigned {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let channel_id = Readable::read(r)?;
-		let fee_satoshis = Readable::read(r)?;
-		let signature = Readable::read(r)?;
-		let mut fee_range = None;
-		decode_tlv_stream!(r, {
-			(1, fee_range, option),
-		});
-		Ok(Self { channel_id, fee_satoshis, signature, fee_range })
-	}
-}
+impl_writeable_msg!(ClosingSigned,
+	{ channel_id, fee_satoshis, signature },
+	{ (1, fee_range, option) }
+);
 
-impl_writeable!(ClosingSignedFeeRange, 2*8, {
+impl_writeable!(ClosingSignedFeeRange, {
 	min_fee_satoshis,
 	max_fee_satoshis
 });
 
-impl_writeable_len_match!(CommitmentSigned, {
-		{ CommitmentSigned { ref htlc_signatures, .. }, 32+64+2+htlc_signatures.len()*64 }
-	}, {
+impl_writeable_msg!(CommitmentSigned, {
 	channel_id,
 	signature,
 	htlc_signatures
-});
+}, {});
 
-impl_writeable_len_match!(DecodedOnionErrorPacket, {
-		{ DecodedOnionErrorPacket { ref failuremsg, ref pad, .. }, 32 + 4 + failuremsg.len() + pad.len() }
-	}, {
+impl_writeable!(DecodedOnionErrorPacket, {
 	hmac,
 	failuremsg,
 	pad
 });
 
-impl_writeable!(FundingCreated, 32+32+2+64, {
+impl_writeable_msg!(FundingCreated, {
 	temporary_channel_id,
 	funding_txid,
 	funding_output_index,
 	signature
-});
+}, {});
 
-impl_writeable!(FundingSigned, 32+64, {
+impl_writeable_msg!(FundingSigned, {
 	channel_id,
 	signature
-});
+}, {});
 
-impl_writeable!(FundingLocked, 32+33, {
+impl_writeable_msg!(ChannelReady, {
 	channel_id,
-	next_per_commitment_point
+	next_per_commitment_point,
+}, {
+	(1, short_channel_id_alias, option),
 });
 
 impl Writeable for Init {
@@ -1188,7 +1288,11 @@ impl Writeable for Init {
 		// global_features gets the bottom 13 bits of our features, and local_features gets all of
 		// our relevant feature bits. This keeps us compatible with old nodes.
 		self.features.write_up_to_13(w)?;
-		self.features.write(w)
+		self.features.write(w)?;
+		encode_tlv_stream!(w, {
+			(3, self.remote_network_address, option)
+		});
+		Ok(())
 	}
 }
 
@@ -1196,16 +1300,18 @@ impl Readable for Init {
 	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 		let global_features: InitFeatures = Readable::read(r)?;
 		let features: InitFeatures = Readable::read(r)?;
+		let mut remote_network_address: Option<NetAddress> = None;
+		decode_tlv_stream!(r, {
+			(3, remote_network_address, option)
+		});
 		Ok(Init {
 			features: features.or(global_features),
+			remote_network_address,
 		})
 	}
 }
 
-impl_writeable_len_match!(OpenChannel, {
-		{ OpenChannel { shutdown_scriptpubkey: OptionalField::Present(ref script), .. }, 319 + 2 + script.len() },
-		{ _, 319 }
-	}, {
+impl_writeable_msg!(OpenChannel, {
 	chain_hash,
 	temporary_channel_id,
 	funding_satoshis,
@@ -1225,56 +1331,57 @@ impl_writeable_len_match!(OpenChannel, {
 	first_per_commitment_point,
 	channel_flags,
 	shutdown_scriptpubkey
+}, {
+	(1, channel_type, option),
 });
 
-impl_writeable!(RevokeAndACK, 32+32+33, {
+impl_writeable_msg!(RevokeAndACK, {
 	channel_id,
 	per_commitment_secret,
 	next_per_commitment_point
-});
+}, {});
 
-impl_writeable_len_match!(Shutdown, {
-		{ Shutdown { ref scriptpubkey, .. }, 32 + 2 + scriptpubkey.len() }
-	}, {
+impl_writeable_msg!(Shutdown, {
 	channel_id,
 	scriptpubkey
-});
+}, {});
 
-impl_writeable_len_match!(UpdateFailHTLC, {
-		{ UpdateFailHTLC { ref reason, .. }, 32 + 10 + reason.data.len() }
-	}, {
+impl_writeable_msg!(UpdateFailHTLC, {
 	channel_id,
 	htlc_id,
 	reason
-});
+}, {});
 
-impl_writeable!(UpdateFailMalformedHTLC, 32+8+32+2, {
+impl_writeable_msg!(UpdateFailMalformedHTLC, {
 	channel_id,
 	htlc_id,
 	sha256_of_onion,
 	failure_code
-});
+}, {});
 
-impl_writeable!(UpdateFee, 32+4, {
+impl_writeable_msg!(UpdateFee, {
 	channel_id,
 	feerate_per_kw
-});
+}, {});
 
-impl_writeable!(UpdateFulfillHTLC, 32+8+32, {
+impl_writeable_msg!(UpdateFulfillHTLC, {
 	channel_id,
 	htlc_id,
 	payment_preimage
-});
+}, {});
 
-impl_writeable_len_match!(OnionErrorPacket, {
-		{ OnionErrorPacket { ref data, .. }, 2 + data.len() }
-	}, {
+// Note that this is written as a part of ChannelManager objects, and thus cannot change its
+// serialization format in a way which assumes we know the total serialized length/message end
+// position.
+impl_writeable!(OnionErrorPacket, {
 	data
 });
 
+// Note that this is written as a part of ChannelManager objects, and thus cannot change its
+// serialization format in a way which assumes we know the total serialized length/message end
+// position.
 impl Writeable for OnionPacket {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(1 + 33 + 20*65 + 32);
 		self.version.write(w)?;
 		match self.public_key {
 			Ok(pubkey) => pubkey.write(w)?,
@@ -1301,38 +1408,55 @@ impl Readable for OnionPacket {
 	}
 }
 
-impl_writeable!(UpdateAddHTLC, 32+8+8+32+4+1366, {
+impl_writeable_msg!(UpdateAddHTLC, {
 	channel_id,
 	htlc_id,
 	amount_msat,
 	payment_hash,
 	cltv_expiry,
 	onion_routing_packet
-});
+}, {});
+
+impl Readable for OnionMessage {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		let blinding_point: PublicKey = Readable::read(r)?;
+		let len: u16 = Readable::read(r)?;
+		let mut packet_reader = FixedLengthReader::new(r, len as u64);
+		let onion_routing_packet: onion_message::Packet = <onion_message::Packet as LengthReadable>::read(&mut packet_reader)?;
+		Ok(Self {
+			blinding_point,
+			onion_routing_packet,
+		})
+	}
+}
+
+impl Writeable for OnionMessage {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+		self.blinding_point.write(w)?;
+		let onion_packet_len = self.onion_routing_packet.serialized_length();
+		(onion_packet_len as u16).write(w)?;
+		self.onion_routing_packet.write(w)?;
+		Ok(())
+	}
+}
 
 impl Writeable for FinalOnionHopData {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(32 + 8 - (self.total_msat.leading_zeros()/8) as usize);
 		self.payment_secret.0.write(w)?;
-		HighZeroBytesDroppedVarInt(self.total_msat).write(w)
+		HighZeroBytesDroppedBigSize(self.total_msat).write(w)
 	}
 }
 
 impl Readable for FinalOnionHopData {
 	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
 		let secret: [u8; 32] = Readable::read(r)?;
-		let amt: HighZeroBytesDroppedVarInt<u64> = Readable::read(r)?;
+		let amt: HighZeroBytesDroppedBigSize<u64> = Readable::read(r)?;
 		Ok(Self { payment_secret: PaymentSecret(secret), total_msat: amt.0 })
 	}
 }
 
 impl Writeable for OnionHopData {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(33);
-		// Note that this should never be reachable if Rust-Lightning generated the message, as we
-		// check values are sane long before we get here, though its possible in the future
-		// user-generated messages may hit this.
-		if self.amt_to_forward > MAX_VALUE_MSAT { panic!("We should never be sending infinite/overflow onion payments"); }
 		match self.format {
 			OnionHopDataFormat::Legacy { short_channel_id } => {
 				0u8.write(w)?;
@@ -1343,18 +1467,15 @@ impl Writeable for OnionHopData {
 			},
 			OnionHopDataFormat::NonFinalNode { short_channel_id } => {
 				encode_varint_length_prefixed_tlv!(w, {
-					(2, HighZeroBytesDroppedVarInt(self.amt_to_forward), required),
-					(4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value), required),
+					(2, HighZeroBytesDroppedBigSize(self.amt_to_forward), required),
+					(4, HighZeroBytesDroppedBigSize(self.outgoing_cltv_value), required),
 					(6, short_channel_id, required)
 				});
 			},
 			OnionHopDataFormat::FinalNode { ref payment_data, ref keysend_preimage } => {
-				if let Some(final_data) = payment_data {
-					if final_data.total_msat > MAX_VALUE_MSAT { panic!("We should never be sending infinite/overflow onion payments"); }
-				}
 				encode_varint_length_prefixed_tlv!(w, {
-					(2, HighZeroBytesDroppedVarInt(self.amt_to_forward), required),
-					(4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value), required),
+					(2, HighZeroBytesDroppedBigSize(self.amt_to_forward), required),
+					(4, HighZeroBytesDroppedBigSize(self.outgoing_cltv_value), required),
 					(8, payment_data, option),
 					(5482373484, keysend_preimage, option)
 				});
@@ -1365,27 +1486,22 @@ impl Writeable for OnionHopData {
 }
 
 impl Readable for OnionHopData {
-	fn read<R: Read>(mut r: &mut R) -> Result<Self, DecodeError> {
-		use bitcoin::consensus::encode::{Decodable, Error, VarInt};
-		let v: VarInt = Decodable::consensus_decode(&mut r)
-			.map_err(|e| match e {
-				Error::Io(ioe) => DecodeError::from(ioe),
-				_ => DecodeError::InvalidValue
-			})?;
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		let b: BigSize = Readable::read(r)?;
 		const LEGACY_ONION_HOP_FLAG: u64 = 0;
-		let (format, amt, cltv_value) = if v.0 != LEGACY_ONION_HOP_FLAG {
-			let mut rd = FixedLengthReader::new(r, v.0);
-			let mut amt = HighZeroBytesDroppedVarInt(0u64);
-			let mut cltv_value = HighZeroBytesDroppedVarInt(0u32);
+		let (format, amt, cltv_value) = if b.0 != LEGACY_ONION_HOP_FLAG {
+			let mut rd = FixedLengthReader::new(r, b.0);
+			let mut amt = HighZeroBytesDroppedBigSize(0u64);
+			let mut cltv_value = HighZeroBytesDroppedBigSize(0u32);
 			let mut short_id: Option<u64> = None;
 			let mut payment_data: Option<FinalOnionHopData> = None;
 			let mut keysend_preimage: Option<PaymentPreimage> = None;
-			// The TLV type is chosen to be compatible with lnd and c-lightning.
 			decode_tlv_stream!(&mut rd, {
 				(2, amt, required),
 				(4, cltv_value, required),
 				(6, short_id, option),
 				(8, payment_data, option),
+				// See https://github.com/lightning/blips/blob/master/blip-0003.md
 				(5482373484, keysend_preimage, option)
 			});
 			rd.eat_remaining().map_err(|_| DecodeError::ShortRead)?;
@@ -1427,9 +1543,16 @@ impl Readable for OnionHopData {
 	}
 }
 
+// ReadableArgs because we need onion_utils::decode_next_hop to accommodate payment packets and
+// onion message packets.
+impl ReadableArgs<()> for OnionHopData {
+	fn read<R: Read>(r: &mut R, _arg: ()) -> Result<Self, DecodeError> {
+		<Self as Readable>::read(r)
+	}
+}
+
 impl Writeable for Ping {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(self.byteslen as usize + 4);
 		self.ponglen.write(w)?;
 		vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
 		Ok(())
@@ -1451,7 +1574,6 @@ impl Readable for Ping {
 
 impl Writeable for Pong {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(self.byteslen as usize + 2);
 		vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
 		Ok(())
 	}
@@ -1471,7 +1593,6 @@ impl Readable for Pong {
 
 impl Writeable for UnsignedChannelAnnouncement {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(2 + 32 + 8 + 4*33 + self.features.byte_count() + self.excess_data.len());
 		self.features.write(w)?;
 		self.chain_hash.write(w)?;
 		self.short_channel_id.write(w)?;
@@ -1499,10 +1620,7 @@ impl Readable for UnsignedChannelAnnouncement {
 	}
 }
 
-impl_writeable_len_match!(ChannelAnnouncement, {
-		{ ChannelAnnouncement { contents: UnsignedChannelAnnouncement {ref features, ref excess_data, ..}, .. },
-			2 + 32 + 8 + 4*33 + features.byte_count() + excess_data.len() + 4*64 }
-	}, {
+impl_writeable!(ChannelAnnouncement, {
 	node_signature_1,
 	node_signature_2,
 	bitcoin_signature_1,
@@ -1512,17 +1630,12 @@ impl_writeable_len_match!(ChannelAnnouncement, {
 
 impl Writeable for UnsignedChannelUpdate {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		let mut size = 64 + self.excess_data.len();
-		let mut message_flags: u8 = 0;
-		if let OptionalField::Present(_) = self.htlc_maximum_msat {
-			size += 8;
-			message_flags = 1;
-		}
-		w.size_hint(size);
+		// `message_flags` used to indicate presence of `htlc_maximum_msat`, but was deprecated in the spec.
+		const MESSAGE_FLAGS: u8 = 1;
 		self.chain_hash.write(w)?;
 		self.short_channel_id.write(w)?;
 		self.timestamp.write(w)?;
-		let all_flags = self.flags as u16 | ((message_flags as u16) << 8);
+		let all_flags = self.flags as u16 | ((MESSAGE_FLAGS as u16) << 8);
 		all_flags.write(w)?;
 		self.cltv_expiry_delta.write(w)?;
 		self.htlc_minimum_msat.write(w)?;
@@ -1536,38 +1649,32 @@ impl Writeable for UnsignedChannelUpdate {
 
 impl Readable for UnsignedChannelUpdate {
 	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let has_htlc_maximum_msat;
 		Ok(Self {
 			chain_hash: Readable::read(r)?,
 			short_channel_id: Readable::read(r)?,
 			timestamp: Readable::read(r)?,
 			flags: {
 				let flags: u16 = Readable::read(r)?;
-				let message_flags = flags >> 8;
-				has_htlc_maximum_msat = (message_flags as i32 & 1) == 1;
+				// Note: we ignore the `message_flags` for now, since it was deprecated by the spec.
 				flags as u8
 			},
 			cltv_expiry_delta: Readable::read(r)?,
 			htlc_minimum_msat: Readable::read(r)?,
 			fee_base_msat: Readable::read(r)?,
 			fee_proportional_millionths: Readable::read(r)?,
-			htlc_maximum_msat: if has_htlc_maximum_msat { Readable::read(r)? } else { OptionalField::Absent },
+			htlc_maximum_msat: Readable::read(r)?,
 			excess_data: read_to_end(r)?,
 		})
 	}
 }
 
-impl_writeable_len_match!(ChannelUpdate, {
-		{ ChannelUpdate { contents: UnsignedChannelUpdate {ref excess_data, ref htlc_maximum_msat, ..}, .. },
-			64 + 64 + excess_data.len() + if let OptionalField::Present(_) = htlc_maximum_msat { 8 } else { 0 } }
-	}, {
+impl_writeable!(ChannelUpdate, {
 	signature,
 	contents
 });
 
 impl Writeable for ErrorMessage {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(32 + 2 + self.data.len());
 		self.channel_id.write(w)?;
 		(self.data.len() as u16).write(w)?;
 		w.write_all(self.data.as_bytes())?;
@@ -1580,10 +1687,38 @@ impl Readable for ErrorMessage {
 		Ok(Self {
 			channel_id: Readable::read(r)?,
 			data: {
-				let mut sz: usize = <u16 as Readable>::read(r)? as usize;
-				let data = read_to_end(r)?;
-				sz = cmp::min(data.len(), sz);
-				match String::from_utf8(data[..sz as usize].to_vec()) {
+				let sz: usize = <u16 as Readable>::read(r)? as usize;
+				let mut data = Vec::with_capacity(sz);
+				data.resize(sz, 0);
+				r.read_exact(&mut data)?;
+				match String::from_utf8(data) {
+					Ok(s) => s,
+					Err(_) => return Err(DecodeError::InvalidValue),
+				}
+			}
+		})
+	}
+}
+
+impl Writeable for WarningMessage {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+		self.channel_id.write(w)?;
+		(self.data.len() as u16).write(w)?;
+		w.write_all(self.data.as_bytes())?;
+		Ok(())
+	}
+}
+
+impl Readable for WarningMessage {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		Ok(Self {
+			channel_id: Readable::read(r)?,
+			data: {
+				let sz: usize = <u16 as Readable>::read(r)? as usize;
+				let mut data = Vec::with_capacity(sz);
+				data.resize(sz, 0);
+				r.read_exact(&mut data)?;
+				match String::from_utf8(data) {
 					Ok(s) => s,
 					Err(_) => return Err(DecodeError::InvalidValue),
 				}
@@ -1594,7 +1729,6 @@ impl Readable for ErrorMessage {
 
 impl Writeable for UnsignedNodeAnnouncement {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(76 + self.features.byte_count() + self.addresses.len()*38 + self.excess_address_data.len() + self.excess_data.len());
 		self.features.write(w)?;
 		self.timestamp.write(w)?;
 		self.node_id.write(w)?;
@@ -1677,10 +1811,7 @@ impl Readable for UnsignedNodeAnnouncement {
 	}
 }
 
-impl_writeable_len_match!(NodeAnnouncement, <=, {
-		{ NodeAnnouncement { contents: UnsignedNodeAnnouncement { ref features, ref addresses, ref excess_address_data, ref excess_data, ..}, .. },
-			64 + 76 + features.byte_count() + addresses.len()*(NetAddress::MAX_LEN as usize + 1) + excess_address_data.len() + excess_data.len() }
-	}, {
+impl_writeable!(NodeAnnouncement, {
 	signature,
 	contents
 });
@@ -1724,7 +1855,6 @@ impl Writeable for QueryShortChannelIds {
 		// Calculated from 1-byte encoding_type plus 8-bytes per short_channel_id
 		let encoding_len: u16 = 1 + self.short_channel_ids.len() as u16 * 8;
 
-		w.size_hint(32 + 2 + encoding_len as usize);
 		self.chain_hash.write(w)?;
 		encoding_len.write(w)?;
 
@@ -1739,25 +1869,10 @@ impl Writeable for QueryShortChannelIds {
 	}
 }
 
-impl Readable for ReplyShortChannelIdsEnd {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let chain_hash: BlockHash = Readable::read(r)?;
-		let full_information: bool = Readable::read(r)?;
-		Ok(ReplyShortChannelIdsEnd {
-			chain_hash,
-			full_information,
-		})
-	}
-}
-
-impl Writeable for ReplyShortChannelIdsEnd {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(32 + 1);
-		self.chain_hash.write(w)?;
-		self.full_information.write(w)?;
-		Ok(())
-	}
-}
+impl_writeable_msg!(ReplyShortChannelIdsEnd, {
+	chain_hash,
+	full_information,
+}, {});
 
 impl QueryChannelRange {
 	/**
@@ -1772,28 +1887,11 @@ impl QueryChannelRange {
 	}
 }
 
-impl Readable for QueryChannelRange {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let chain_hash: BlockHash = Readable::read(r)?;
-		let first_blocknum: u32 = Readable::read(r)?;
-		let number_of_blocks: u32 = Readable::read(r)?;
-		Ok(QueryChannelRange {
-			chain_hash,
-			first_blocknum,
-			number_of_blocks
-		})
-	}
-}
-
-impl Writeable for QueryChannelRange {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(32 + 4 + 4);
-		self.chain_hash.write(w)?;
-		self.first_blocknum.write(w)?;
-		self.number_of_blocks.write(w)?;
-		Ok(())
-	}
-}
+impl_writeable_msg!(QueryChannelRange, {
+	chain_hash,
+	first_blocknum,
+	number_of_blocks
+}, {});
 
 impl Readable for ReplyChannelRange {
 	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
@@ -1838,7 +1936,6 @@ impl Readable for ReplyChannelRange {
 impl Writeable for ReplyChannelRange {
 	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
 		let encoding_len: u16 = 1 + self.short_channel_ids.len() as u16 * 8;
-		w.size_hint(32 + 4 + 4 + 1 + 2 + encoding_len as usize);
 		self.chain_hash.write(w)?;
 		self.first_blocknum.write(w)?;
 		self.number_of_blocks.write(w)?;
@@ -1854,37 +1951,20 @@ impl Writeable for ReplyChannelRange {
 	}
 }
 
-impl Readable for GossipTimestampFilter {
-	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
-		let chain_hash: BlockHash = Readable::read(r)?;
-		let first_timestamp: u32 = Readable::read(r)?;
-		let timestamp_range: u32 = Readable::read(r)?;
-		Ok(GossipTimestampFilter {
-			chain_hash,
-			first_timestamp,
-			timestamp_range,
-		})
-	}
-}
-
-impl Writeable for GossipTimestampFilter {
-	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
-		w.size_hint(32 + 4 + 4);
-		self.chain_hash.write(w)?;
-		self.first_timestamp.write(w)?;
-		self.timestamp_range.write(w)?;
-		Ok(())
-	}
-}
-
+impl_writeable_msg!(GossipTimestampFilter, {
+	chain_hash,
+	first_timestamp,
+	timestamp_range,
+}, {});
 
 #[cfg(test)]
 mod tests {
 	use hex;
-	use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
-	use ln::msgs;
-	use ln::msgs::{ChannelFeatures, FinalOnionHopData, InitFeatures, NodeFeatures, OptionalField, OnionErrorPacket, OnionHopDataFormat};
-	use util::ser::{Writeable, Readable};
+	use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
+	use crate::ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
+	use crate::ln::msgs;
+	use crate::ln::msgs::{FinalOnionHopData, OptionalField, OnionErrorPacket, OnionHopDataFormat};
+	use crate::util::ser::{Writeable, Readable, Hostname};
 
 	use bitcoin::hashes::hex::FromHex;
 	use bitcoin::util::address::Address;
@@ -1893,11 +1973,12 @@ mod tests {
 	use bitcoin::blockdata::opcodes;
 	use bitcoin::hash_types::{Txid, BlockHash};
 
-	use bitcoin::secp256k1::key::{PublicKey,SecretKey};
+	use bitcoin::secp256k1::{PublicKey,SecretKey};
 	use bitcoin::secp256k1::{Secp256k1, Message};
 
-	use io::Cursor;
-	use prelude::*;
+	use crate::io::{self, Cursor};
+	use crate::prelude::*;
+	use core::convert::TryFrom;
 
 	#[test]
 	fn encoding_channel_reestablish_no_secret() {
@@ -1950,7 +2031,7 @@ mod tests {
 		($privkey: expr, $ctx: expr, $string: expr) => {
 			{
 				let sighash = Message::from_slice(&$string.into_bytes()[..]).unwrap();
-				$ctx.sign(&sighash, &$privkey)
+				$ctx.sign_ecdsa(&sighash, &$privkey)
 			}
 		}
 	}
@@ -1982,7 +2063,7 @@ mod tests {
 		let sig_2 = get_sig_on!(privkey_2, secp_ctx, String::from("01010101010101010101010101010101"));
 		let sig_3 = get_sig_on!(privkey_3, secp_ctx, String::from("01010101010101010101010101010101"));
 		let sig_4 = get_sig_on!(privkey_4, secp_ctx, String::from("01010101010101010101010101010101"));
-		let mut features = ChannelFeatures::known();
+		let mut features = ChannelFeatures::empty();
 		if unknown_features_bits {
 			features = ChannelFeatures::from_le_bytes(vec![0xFF, 0xFF]);
 		}
@@ -2026,7 +2107,7 @@ mod tests {
 		do_encoding_channel_announcement(true, true);
 	}
 
-	fn do_encoding_node_announcement(unknown_features_bits: bool, ipv4: bool, ipv6: bool, onionv2: bool, onionv3: bool, excess_address_data: bool, excess_data: bool) {
+	fn do_encoding_node_announcement(unknown_features_bits: bool, ipv4: bool, ipv6: bool, onionv2: bool, onionv3: bool, hostname: bool, excess_address_data: bool, excess_data: bool) {
 		let secp_ctx = Secp256k1::new();
 		let (privkey_1, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
 		let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
@@ -2050,10 +2131,9 @@ mod tests {
 			});
 		}
 		if onionv2 {
-			addresses.push(msgs::NetAddress::OnionV2 {
-				addr: [255, 254, 253, 252, 251, 250, 249, 248, 247, 246],
-				port: 9735
-			});
+			addresses.push(msgs::NetAddress::OnionV2(
+				[255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 38, 7]
+			));
 		}
 		if onionv3 {
 			addresses.push(msgs::NetAddress::OnionV3 {
@@ -2063,6 +2143,12 @@ mod tests {
 				port: 9735
 			});
 		}
+		if hostname {
+			addresses.push(msgs::NetAddress::Hostname {
+				hostname: Hostname::try_from(String::from("host")).unwrap(),
+				port: 9735,
+			});
+		}
 		let mut addr_len = 0;
 		for addr in &addresses {
 			addr_len += addr.len() + 1;
@@ -2103,6 +2189,9 @@ mod tests {
 		if onionv3 {
 			target_value.append(&mut hex::decode("04fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0efeeedecebeae9e8e7e6e5e4e3e2e1e00020102607").unwrap());
 		}
+		if hostname {
+			target_value.append(&mut hex::decode("0504686f73742607").unwrap());
+		}
 		if excess_address_data {
 			target_value.append(&mut hex::decode("216c280b5395a2546e7e4b2663e04f811622f15a4f92e83aa2e92ba2a573c139142c54ae63072a1ec1ee7dc0c04bde5c847806172aa05c92c22ae8e308d1d269").unwrap());
 		}
@@ -2114,18 +2203,19 @@ mod tests {
 
 	#[test]
 	fn encoding_node_announcement() {
-		do_encoding_node_announcement(true, true, true, true, true, true, true);
-		do_encoding_node_announcement(false, false, false, false, false, false, false);
-		do_encoding_node_announcement(false, true, false, false, false, false, false);
-		do_encoding_node_announcement(false, false, true, false, false, false, false);
-		do_encoding_node_announcement(false, false, false, true, false, false, false);
-		do_encoding_node_announcement(false, false, false, false, true, false, false);
-		do_encoding_node_announcement(false, false, false, false, false, true, false);
-		do_encoding_node_announcement(false, true, false, true, false, true, false);
-		do_encoding_node_announcement(false, false, true, false, true, false, false);
-	}
-
-	fn do_encoding_channel_update(direction: bool, disable: bool, htlc_maximum_msat: bool, excess_data: bool) {
+		do_encoding_node_announcement(true, true, true, true, true, true, true, true);
+		do_encoding_node_announcement(false, false, false, false, false, false, false, false);
+		do_encoding_node_announcement(false, true, false, false, false, false, false, false);
+		do_encoding_node_announcement(false, false, true, false, false, false, false, false);
+		do_encoding_node_announcement(false, false, false, true, false, false, false, false);
+		do_encoding_node_announcement(false, false, false, false, true, false, false, false);
+		do_encoding_node_announcement(false, false, false, false, false, true, false, false);
+		do_encoding_node_announcement(false, false, false, false, false, false, true, false);
+		do_encoding_node_announcement(false, true, false, true, false, false, true, false);
+		do_encoding_node_announcement(false, false, true, false, true, false, false, false);
+	}
+
+	fn do_encoding_channel_update(direction: bool, disable: bool, excess_data: bool) {
 		let secp_ctx = Secp256k1::new();
 		let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
 		let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
@@ -2136,7 +2226,7 @@ mod tests {
 			flags: if direction { 1 } else { 0 } | if disable { 1 << 1 } else { 0 },
 			cltv_expiry_delta: 144,
 			htlc_minimum_msat: 1000000,
-			htlc_maximum_msat: if htlc_maximum_msat { OptionalField::Present(131355275467161) } else { OptionalField::Absent },
+			htlc_maximum_msat: 131355275467161,
 			fee_base_msat: 10000,
 			fee_proportional_millionths: 20,
 			excess_data: if excess_data { vec![0, 0, 0, 0, 59, 154, 202, 0] } else { Vec::new() }
@@ -2149,11 +2239,7 @@ mod tests {
 		let mut target_value = hex::decode("d977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
 		target_value.append(&mut hex::decode("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f").unwrap());
 		target_value.append(&mut hex::decode("00083a840000034d013413a7").unwrap());
-		if htlc_maximum_msat {
-			target_value.append(&mut hex::decode("01").unwrap());
-		} else {
-			target_value.append(&mut hex::decode("00").unwrap());
-		}
+		target_value.append(&mut hex::decode("01").unwrap());
 		target_value.append(&mut hex::decode("00").unwrap());
 		if direction {
 			let flag = target_value.last_mut().unwrap();
@@ -2164,9 +2250,7 @@ mod tests {
 			*flag = *flag | 1 << 1;
 		}
 		target_value.append(&mut hex::decode("009000000000000f42400000271000000014").unwrap());
-		if htlc_maximum_msat {
-			target_value.append(&mut hex::decode("0000777788889999").unwrap());
-		}
+		target_value.append(&mut hex::decode("0000777788889999").unwrap());
 		if excess_data {
 			target_value.append(&mut hex::decode("000000003b9aca00").unwrap());
 		}
@@ -2175,19 +2259,17 @@ mod tests {
 
 	#[test]
 	fn encoding_channel_update() {
-		do_encoding_channel_update(false, false, false, false);
-		do_encoding_channel_update(false, false, false, true);
-		do_encoding_channel_update(true, false, false, false);
-		do_encoding_channel_update(true, false, false, true);
-		do_encoding_channel_update(false, true, false, false);
-		do_encoding_channel_update(false, true, false, true);
-		do_encoding_channel_update(false, false, true, false);
-		do_encoding_channel_update(false, false, true, true);
-		do_encoding_channel_update(true, true, true, false);
-		do_encoding_channel_update(true, true, true, true);
-	}
-
-	fn do_encoding_open_channel(random_bit: bool, shutdown: bool) {
+		do_encoding_channel_update(false, false, false);
+		do_encoding_channel_update(false, false, true);
+		do_encoding_channel_update(true, false, false);
+		do_encoding_channel_update(true, false, true);
+		do_encoding_channel_update(false, true, false);
+		do_encoding_channel_update(false, true, true);
+		do_encoding_channel_update(true, true, false);
+		do_encoding_channel_update(true, true, true);
+	}
+
+	fn do_encoding_open_channel(random_bit: bool, shutdown: bool, incl_chan_type: bool) {
 		let secp_ctx = Secp256k1::new();
 		let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
 		let (_, pubkey_2) = get_keys_from!("0202020202020202020202020202020202020202020202020202020202020202", secp_ctx);
@@ -2214,7 +2296,8 @@ mod tests {
 			htlc_basepoint: pubkey_5,
 			first_per_commitment_point: pubkey_6,
 			channel_flags: if random_bit { 1 << 5 } else { 0 },
-			shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent }
+			shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, inner: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent },
+			channel_type: if incl_chan_type { Some(ChannelTypeFeatures::empty()) } else { None },
 		};
 		let encoded_value = open_channel.encode();
 		let mut target_value = Vec::new();
@@ -2228,15 +2311,22 @@ mod tests {
 		if shutdown {
 			target_value.append(&mut hex::decode("001976a91479b000887626b294a914501a4cd226b58b23598388ac").unwrap());
 		}
+		if incl_chan_type {
+			target_value.append(&mut hex::decode("0100").unwrap());
+		}
 		assert_eq!(encoded_value, target_value);
 	}
 
 	#[test]
 	fn encoding_open_channel() {
-		do_encoding_open_channel(false, false);
-		do_encoding_open_channel(true, false);
-		do_encoding_open_channel(false, true);
-		do_encoding_open_channel(true, true);
+		do_encoding_open_channel(false, false, false);
+		do_encoding_open_channel(false, false, true);
+		do_encoding_open_channel(false, true, false);
+		do_encoding_open_channel(false, true, true);
+		do_encoding_open_channel(true, false, false);
+		do_encoding_open_channel(true, false, true);
+		do_encoding_open_channel(true, true, false);
+		do_encoding_open_channel(true, true, true);
 	}
 
 	fn do_encoding_accept_channel(shutdown: bool) {
@@ -2262,7 +2352,8 @@ mod tests {
 			delayed_payment_basepoint: pubkey_4,
 			htlc_basepoint: pubkey_5,
 			first_per_commitment_point: pubkey_6,
-			shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent }
+			shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, inner: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent },
+			channel_type: None,
 		};
 		let encoded_value = accept_channel.encode();
 		let mut target_value = hex::decode("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").unwrap();
@@ -2309,14 +2400,15 @@ mod tests {
 	}
 
 	#[test]
-	fn encoding_funding_locked() {
+	fn encoding_channel_ready() {
 		let secp_ctx = Secp256k1::new();
 		let (_, pubkey_1,) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
-		let funding_locked = msgs::FundingLocked {
+		let channel_ready = msgs::ChannelReady {
 			channel_id: [2; 32],
 			next_per_commitment_point: pubkey_1,
+			short_channel_id_alias: None,
 		};
-		let encoded_value = funding_locked.encode();
+		let encoded_value = channel_ready.encode();
 		let target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f").unwrap();
 		assert_eq!(encoded_value, target_value);
 	}
@@ -2328,9 +2420,9 @@ mod tests {
 		let shutdown = msgs::Shutdown {
 			channel_id: [2; 32],
 			scriptpubkey:
-				     if script_type == 1 { Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey() }
-				else if script_type == 2 { Address::p2sh(&script, Network::Testnet).script_pubkey() }
-				else if script_type == 3 { Address::p2wpkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).unwrap().script_pubkey() }
+				     if script_type == 1 { Address::p2pkh(&::bitcoin::PublicKey{compressed: true, inner: pubkey_1}, Network::Testnet).script_pubkey() }
+				else if script_type == 2 { Address::p2sh(&script, Network::Testnet).unwrap().script_pubkey() }
+				else if script_type == 3 { Address::p2wpkh(&::bitcoin::PublicKey{compressed: true, inner: pubkey_1}, Network::Testnet).unwrap().script_pubkey() }
 				else                     { Address::p2wsh(&script, Network::Testnet).script_pubkey() },
 		};
 		let encoded_value = shutdown.encode();
@@ -2510,13 +2602,27 @@ mod tests {
 	fn encoding_init() {
 		assert_eq!(msgs::Init {
 			features: InitFeatures::from_le_bytes(vec![0xFF, 0xFF, 0xFF]),
+			remote_network_address: None,
 		}.encode(), hex::decode("00023fff0003ffffff").unwrap());
 		assert_eq!(msgs::Init {
 			features: InitFeatures::from_le_bytes(vec![0xFF]),
+			remote_network_address: None,
 		}.encode(), hex::decode("0001ff0001ff").unwrap());
 		assert_eq!(msgs::Init {
 			features: InitFeatures::from_le_bytes(vec![]),
+			remote_network_address: None,
 		}.encode(), hex::decode("00000000").unwrap());
+
+		let init_msg = msgs::Init { features: InitFeatures::from_le_bytes(vec![]),
+			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();
+		assert_eq!(encoded_value, target_value);
+		assert_eq!(msgs::Init::read(&mut Cursor::new(&target_value)).unwrap(), init_msg);
 	}
 
 	#[test]
@@ -2530,6 +2636,17 @@ mod tests {
 		assert_eq!(encoded_value, target_value);
 	}
 
+	#[test]
+	fn encoding_warning() {
+		let error = msgs::WarningMessage {
+			channel_id: [2; 32],
+			data: String::from("rust-lightning"),
+		};
+		let encoded_value = error.encode();
+		let target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202000e727573742d6c696768746e696e67").unwrap();
+		assert_eq!(encoded_value, target_value);
+	}
+
 	#[test]
 	fn encoding_ping() {
 		let ping = msgs::Ping {
@@ -2770,4 +2887,40 @@ mod tests {
 		assert_eq!(gossip_timestamp_filter.first_timestamp, 1590000000);
 		assert_eq!(gossip_timestamp_filter.timestamp_range, 0xffff_ffff);
 	}
+
+	#[test]
+	fn decode_onion_hop_data_len_as_bigsize() {
+		// Tests that we can decode an onion payload that is >253 bytes.
+		// Previously, receiving a payload of this size could've caused us to fail to decode a valid
+		// payload, because we were decoding the length (a BigSize, big-endian) as a VarInt
+		// (little-endian).
+
+		// Encode a test onion payload with a big custom TLV such that it's >253 bytes, forcing the
+		// payload length to be encoded over multiple bytes rather than a single u8.
+		let big_payload = encode_big_payload().unwrap();
+		let mut rd = Cursor::new(&big_payload[..]);
+		<msgs::OnionHopData as Readable>::read(&mut rd).unwrap();
+	}
+	// see above test, needs to be a separate method for use of the serialization macros.
+	fn encode_big_payload() -> Result<Vec<u8>, io::Error> {
+		use crate::util::ser::HighZeroBytesDroppedBigSize;
+		let payload = msgs::OnionHopData {
+			format: OnionHopDataFormat::NonFinalNode {
+				short_channel_id: 0xdeadbeef1bad1dea,
+			},
+			amt_to_forward: 1000,
+			outgoing_cltv_value: 0xffffffff,
+		};
+		let mut encoded_payload = Vec::new();
+		let test_bytes = vec![42u8; 1000];
+		if let OnionHopDataFormat::NonFinalNode { short_channel_id } = payload.format {
+			encode_varint_length_prefixed_tlv!(&mut encoded_payload, {
+				(1, test_bytes, vec_type),
+				(2, HighZeroBytesDroppedBigSize(payload.amt_to_forward), required),
+				(4, HighZeroBytesDroppedBigSize(payload.outgoing_cltv_value), required),
+				(6, short_channel_id, required)
+			});
+		}
+		Ok(encoded_payload)
+	}
 }