From 9f8feeab71ccb864606c336097e20dbb8e1d8c86 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sun, 1 Nov 2026 05:22:38 +0100
Subject: libp2p: autoignore unroutable address ranges

---
 src/transport/libp2p/mod.rs | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

(limited to 'src/transport/libp2p/mod.rs')

diff --git a/src/transport/libp2p/mod.rs b/src/transport/libp2p/mod.rs
index 9d1dcc7..ace84c6 100644
--- a/src/transport/libp2p/mod.rs
+++ b/src/transport/libp2p/mod.rs
@@ -50,8 +50,12 @@
 //!
 //! With `--libp2p-ignore`, address ranges are left out (VPNs): not published, not told
 //! peers by identify (`Identifying`), not offered for hole punching, not dialled, and
-//! connections there refused (`Ignoring`). With `--libp2p-prefer`, addresses in the
-//! ranges named come first, where only so many are kept (`Book::preference`).
+//! connections there refused (`Ignoring`). Ranges this node has no route to are left
+//! out alike, as long as it has none (`routes`): without IPv6 to the internet, peers'
+//! public IPv6 addresses; and with `--libp2p-internet-hosts`, its own aren't published
+//! then. With `--libp2p-prefer`,
+//! addresses in the ranges named come first, where only so many are kept
+//! (`Book::preference`).
 //!
 //! With `--libp2p-upnp`, a node asks its router to forward its listen ports (UPnP), and
 //! publishes the router's public address for them with its own (`Book::direct`): then
@@ -101,6 +105,7 @@ mod driver;
 mod errors;
 mod ignore;
 mod relays;
+mod routes;
 
 use behaviour::*;
 use book::*;
@@ -109,6 +114,7 @@ use driver::*;
 use errors::*;
 use ignore::*;
 use relays::*;
+use routes::*;
 
 /// The scheme of this transport's addresses (`transport::paths`).
 pub(crate) const SCHEME: &str = "libp2p";
@@ -251,6 +257,7 @@ impl Libp2pTransport {
             announced: config.announce,
             ignored: config.ignore.clone(),
             preferred: config.prefer.clone(),
+            routes: Routes::asking(config.internet_hosts.clone()),
             serving: config.relay,
             ..Book::default()
         };
@@ -288,13 +295,13 @@ impl Libp2pTransport {
     /// Connected to `peer`, if it can be had in time.
     async fn connect(&self, peer: PeerId) -> Result<()> {
         let addresses = {
-            let book = lock(&self.book);
+            let mut book = lock(&self.book);
             let mut known = book
                 .addresses
                 .get(&peer)
                 .map(|known| dialable(known, self.peer_id))
                 .unwrap_or_default();
-            known.retain(|address| !left_out(&book.ignored, address));
+            known.retain(|address| !book.left_out(address));
             if known.is_empty() {
                 book.through_relays(peer, self.peer_id)
             } else {
-- 
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