Support decoding invreqs in inbound onion payloads.

Author: valentinewallace

lightning/src/ln/msgs.rs

@@ -35,6 +35,7 @@ use crate::blinded_path::payment::{BlindedPaymentTlvs, ForwardTlvs, ReceiveTlvs}
 use crate::ln::types::{ChannelId, PaymentPreimage, PaymentHash, PaymentSecret};
 use crate::ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
 use crate::ln::onion_utils;
+use crate::offers::invoice_request::InvoiceRequest;
 use crate::onion_message;
 use crate::sign::{NodeSigner, Recipient};
 
@@ -1776,6 +1777,7 @@ mod fuzzy_internal_msgs {
 			payment_context: PaymentContext,
 			intro_node_blinding_point: Option<PublicKey>,
 			keysend_preimage: Option<PaymentPreimage>,
+			invoice_request: Option<InvoiceRequest>,
 			custom_tlvs: Vec<(u64, Vec<u8>)>,
 		}
 	}
@@ -2778,6 +2780,7 @@ impl<NS: Deref> ReadableArgs<(Option<PublicKey>, NS)> for InboundOnionPayload wh
 		let mut payment_metadata: Option<WithoutLength<Vec<u8>>> = None;
 		let mut total_msat = None;
 		let mut keysend_preimage: Option<PaymentPreimage> = None;
+		let mut invoice_request: Option<InvoiceRequest> = None;
 		let mut custom_tlvs = Vec::new();
 
 		let tlv_len = BigSize::read(r)?;
@@ -2791,6 +2794,7 @@ impl<NS: Deref> ReadableArgs<(Option<PublicKey>, NS)> for InboundOnionPayload wh
 			(12, intro_node_blinding_point, option),
 			(16, payment_metadata, option),
 			(18, total_msat, (option, encoding: (u64, HighZeroBytesDroppedBigSize))),
+			(ONION_INVREQ_TLV_TYPE, invoice_request, option),
 			// See https://github.com/lightning/blips/blob/master/blip-0003.md
 			(5482373484, keysend_preimage, option)
 		}, |msg_type: u64, msg_reader: &mut FixedLengthReader<_>| -> Result<bool, DecodeError> {
@@ -2821,7 +2825,7 @@ impl<NS: Deref> ReadableArgs<(Option<PublicKey>, NS)> for InboundOnionPayload wh
 					short_channel_id, payment_relay, payment_constraints, features, next_blinding_override
 				})} => {
 					if amt.is_some() || cltv_value.is_some() || total_msat.is_some() ||
-						keysend_preimage.is_some()
+						keysend_preimage.is_some() || invoice_request.is_some()
 					{
 						return Err(DecodeError::InvalidValue)
 					}
@@ -2847,21 +2851,22 @@ impl<NS: Deref> ReadableArgs<(Option<PublicKey>, NS)> for InboundOnionPayload wh
 						payment_context,
 						intro_node_blinding_point,
 						keysend_preimage,
+						invoice_request,
 						custom_tlvs,
 					})
 				},
 			}
 		} else if let Some(short_channel_id) = short_id {
 			if payment_data.is_some() || payment_metadata.is_some() || encrypted_tlvs_opt.is_some() ||
-				total_msat.is_some()
+				total_msat.is_some() || invoice_request.is_some()
 			{ return Err(DecodeError::InvalidValue) }
 			Ok(Self::Forward {
 				short_channel_id,
 				amt_to_forward: amt.ok_or(DecodeError::InvalidValue)?,
 				outgoing_cltv_value: cltv_value.ok_or(DecodeError::InvalidValue)?,
 			})
 		} else {
-			if encrypted_tlvs_opt.is_some() || total_msat.is_some() {
+			if encrypted_tlvs_opt.is_some() || total_msat.is_some() || invoice_request.is_some() {
 				return Err(DecodeError::InvalidValue)
 			}
 			if let Some(data) = &payment_data {

lightning/src/ln/onion_payment.rs

@@ -146,7 +146,7 @@ pub(super) fn create_recv_pending_htlc_info(
 		msgs::InboundOnionPayload::BlindedReceive {
 			sender_intended_htlc_amt_msat, total_msat, cltv_expiry_height, payment_secret,
 			intro_node_blinding_point, payment_constraints, payment_context, keysend_preimage,
-			custom_tlvs
+			custom_tlvs, invoice_request: _
 		} => {
 			check_blinded_payment_constraints(
 				sender_intended_htlc_amt_msat, cltv_expiry, &payment_constraints