Disable MPP routing when the payee does not support it

fuzz/src/full_stack.rs

@@ -414,7 +414,7 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
 			},
 			4 => {
 				let value = slice_to_be24(get_slice!(3)) as u64;
-				let route = match get_route(&our_id, &net_graph_msg_handler.network_graph.read().unwrap(), &get_pubkey!(), None, &Vec::new(), value, 42, Arc::clone(&logger)) {
+				let route = match get_route(&our_id, &net_graph_msg_handler.network_graph.read().unwrap(), &get_pubkey!(), None, None, &Vec::new(), value, 42, Arc::clone(&logger)) {
 					Ok(route) => route,
 					Err(_) => return,
 				};
@@ -431,7 +431,7 @@ pub fn do_test(data: &[u8], logger: &Arc<dyn Logger>) {
 			},
 			15 => {
 				let value = slice_to_be24(get_slice!(3)) as u64;
-				let mut route = match get_route(&our_id, &net_graph_msg_handler.network_graph.read().unwrap(), &get_pubkey!(), None, &Vec::new(), value, 42, Arc::clone(&logger)) {
+				let mut route = match get_route(&our_id, &net_graph_msg_handler.network_graph.read().unwrap(), &get_pubkey!(), None, None, &Vec::new(), value, 42, Arc::clone(&logger)) {
 					Ok(route) => route,
 					Err(_) => return,
 				};

fuzz/src/router.rs

@@ -238,7 +238,7 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 				}
 				let last_hops = &last_hops_vec[..];
 				for target in node_pks.iter() {
-					let _ = get_route(&our_pubkey, &net_graph, target,
+					let _ = get_route(&our_pubkey, &net_graph, target, None,
 						first_hops.map(|c| c.iter().collect::<Vec<_>>()).as_ref().map(|a| a.as_slice()),
 						&last_hops.iter().collect::<Vec<_>>(),
 						slice_to_be64(get_slice!(8)), slice_to_be32(get_slice!(4)), Arc::clone(&logger));

lightning/src/ln/features.rs

@@ -140,6 +140,17 @@ mod sealed {
 		required_features: [],
 		optional_features: [],
 	});
+	define_context!(InvoiceContext {
+		required_features: [,,,],
+		optional_features: [
+			// Byte 0
+			,
+			// Byte 1
+			VariableLengthOnion | PaymentSecret,
+			// Byte 2
+			BasicMPP,
+		],
+	});
 
 	/// Defines a feature with the given bits for the specified [`Context`]s. The generated trait is
 	/// useful for manipulating feature flags.
@@ -252,13 +263,13 @@ mod sealed {
 		"Feature flags for `option_upfront_shutdown_script`.");
 	define_feature!(7, GossipQueries, [InitContext, NodeContext],
 		"Feature flags for `gossip_queries`.");
-	define_feature!(9, VariableLengthOnion, [InitContext, NodeContext],
+	define_feature!(9, VariableLengthOnion, [InitContext, NodeContext, InvoiceContext],
 		"Feature flags for `var_onion_optin`.");
 	define_feature!(13, StaticRemoteKey, [InitContext, NodeContext],
 		"Feature flags for `option_static_remotekey`.");
-	define_feature!(15, PaymentSecret, [InitContext, NodeContext],
+	define_feature!(15, PaymentSecret, [InitContext, NodeContext, InvoiceContext],
 		"Feature flags for `payment_secret`.");
-	define_feature!(17, BasicMPP, [InitContext, NodeContext],
+	define_feature!(17, BasicMPP, [InitContext, NodeContext, InvoiceContext],
 		"Feature flags for `basic_mpp`.");
 	define_feature!(27, ShutdownAnySegwit, [InitContext, NodeContext],
 		"Feature flags for `opt_shutdown_anysegwit`.");
@@ -323,6 +334,8 @@ pub type InitFeatures = Features<sealed::InitContext>;
 pub type NodeFeatures = Features<sealed::NodeContext>;
 /// Features used within a `channel_announcement` message.
 pub type ChannelFeatures = Features<sealed::ChannelContext>;
+/// Features used within an invoice.
+pub type InvoiceFeatures = Features<sealed::InvoiceContext>;
 
 impl InitFeatures {
 	/// Writes all features present up to, and including, 13.
@@ -359,6 +372,14 @@ impl InitFeatures {
 	}
 }
 
+impl InvoiceFeatures {
+	/// Converts `InvoiceFeatures` to `Features<C>`. Only known `InvoiceFeatures` relevant to
+	/// context `C` are included in the result.
+	pub(crate) fn to_context<C: sealed::Context>(&self) -> Features<C> {
+		self.to_context_internal()
+	}
+}
+
 impl<T: sealed::Context> Features<T> {
 	/// Create a blank Features with no features set
 	pub fn empty() -> Self {
@@ -553,7 +574,6 @@ impl<T: sealed::BasicMPP> Features<T> {
 		<T as sealed::BasicMPP>::requires_feature(&self.flags)
 	}
 	// We currently never test for this since we don't actually *generate* multipath routes.
-	#[allow(dead_code)]
 	pub(crate) fn supports_basic_mpp(&self) -> bool {
 		<T as sealed::BasicMPP>::supports_feature(&self.flags)
 	}

lightning/src/ln/functional_test_utils.rs

@@ -1025,7 +1025,7 @@ pub const TEST_FINAL_CLTV: u32 = 32;
 pub fn route_payment<'a, 'b, 'c>(origin_node: &Node<'a, 'b, 'c>, expected_route: &[&Node<'a, 'b, 'c>], recv_value: u64) -> (PaymentPreimage, PaymentHash) {
 	let net_graph_msg_handler = &origin_node.net_graph_msg_handler;
 	let logger = test_utils::TestLogger::new();
-	let route = get_route(&origin_node.node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV, &logger).unwrap();
+	let route = get_route(&origin_node.node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &expected_route.last().unwrap().node.get_our_node_id(), None, None, &Vec::new(), recv_value, TEST_FINAL_CLTV, &logger).unwrap();
 	assert_eq!(route.paths.len(), 1);
 	assert_eq!(route.paths[0].len(), expected_route.len());
 	for (node, hop) in expected_route.iter().zip(route.paths[0].iter()) {
@@ -1038,7 +1038,7 @@ pub fn route_payment<'a, 'b, 'c>(origin_node: &Node<'a, 'b, 'c>, expected_route:
 pub fn route_over_limit<'a, 'b, 'c>(origin_node: &Node<'a, 'b, 'c>, expected_route: &[&Node<'a, 'b, 'c>], recv_value: u64)  {
 	let logger = test_utils::TestLogger::new();
 	let net_graph_msg_handler = &origin_node.net_graph_msg_handler;
-	let route = get_route(&origin_node.node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV, &logger).unwrap();
+	let route = get_route(&origin_node.node.get_our_node_id(), &net_graph_msg_handler.network_graph.read().unwrap(), &expected_route.last().unwrap().node.get_our_node_id(), None, None, &Vec::new(), recv_value, TEST_FINAL_CLTV, &logger).unwrap();
 	assert_eq!(route.paths.len(), 1);
 	assert_eq!(route.paths[0].len(), expected_route.len());
 	for (node, hop) in expected_route.iter().zip(route.paths[0].iter()) {