Expose method to fetch NoRoute subnets from router

Signed-off-by: Lee Smet <lee.smet@hotmail.com>

mycelium/src/router.rs

@@ -7,7 +7,9 @@ use crate::{
     packet::{ControlPacket, DataPacket},
     peer::Peer,
     router_id::RouterId,
-    routing_table::{QueriedSubnet, RouteEntry, RouteKey, RouteList, Routes, RoutingTable},
+    routing_table::{
+        NoRouteSubnet, QueriedSubnet, RouteEntry, RouteKey, RouteList, Routes, RoutingTable,
+    },
     seqno_cache::{SeqnoCache, SeqnoRequestCacheKey},
     sequence_number::SeqNo,
     source_table::{FeasibilityDistance, SourceKey, SourceTable},
@@ -314,6 +316,10 @@ where
         self.routing_table.read().iter_queries().collect()
     }
 
+    pub fn load_no_route_entries(&self) -> Vec<NoRouteSubnet> {
+        self.routing_table.read().iter_no_route().collect()
+    }
+
     /// Task which periodically checks for dead peers in the Router.
     async fn check_for_dead_peers(self) {
         loop {

mycelium/src/routing_table.rs

@@ -5,7 +5,7 @@ use std::{
 };
 
 use ip_network_table_deps_treebitmap::IpLookupTable;
-use iter::RoutingTableQueryIter;
+use iter::{RoutingTableNoRouteIter, RoutingTableQueryIter};
 use subnet_entry::SubnetEntry;
 use tokio::{select, sync::mpsc, time::Duration};
 use tokio_util::sync::CancellationToken;
@@ -390,6 +390,12 @@ impl RoutingTableReadGuard<'_> {
     pub fn iter_queries(&self) -> RoutingTableQueryIter {
         RoutingTableQueryIter::new(self.guard.table.iter())
     }
+
+    /// Create an iterator for all subnets which are currently marked as `NoRoute` in the routing
+    /// table.
+    pub fn iter_no_route(&self) -> RoutingTableNoRouteIter {
+        RoutingTableNoRouteIter::new(self.guard.table.iter())
+    }
 }
 
 impl WriteGuard<'_> {