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fix(wgbridge): rebind UDP sockets to a fresh ephemeral port #999

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Merged
kasnder merged 1 commit into from
Oct 25, 2026
Merged

fix(wgbridge): rebind UDP sockets to a fresh ephemeral port #999

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16 changes: 10 additions & 6 deletions wgbridge-rs/src/tunnel.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -299,13 +299,17 @@ impl Tunnel {
let device = guard.as_ref().ok_or("tunnel stopped")?;
device
.write(async |d| {
// Toggling the port marks the connection dirty so the
// Changing the port marks the connection dirty so the
// write commit re-runs Connection::set_up, which re-binds
// through ProtectedUdpFactory. The final value is the
// original port again.
let port = d.listen_port();
d.set_listen_port(if port == 0 { 1 } else { 0 });
d.set_listen_port(port);
// through ProtectedUdpFactory. Since gotatun 0.10 the
// device remembers the port it actually bound, so restoring
// it would re-bind that exact port while the old socket may
// still be closing (EADDRINUSE). End on 0 instead to get a
// fresh ephemeral port; peers roam to it on the next packet.
if d.listen_port() == 0 {
d.set_listen_port(1);
}
d.set_listen_port(0);
})
.await
.map_err(|e| e.to_string())?;
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