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fix: add loopback to connector bind addresses for localhost connections

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set_bind_addr_for_peer_connector collected all local interface IPs
as bind addresses but omitted 127.0.0.1. When connecting to localhost,
the connector would bind to a non-loopback IP (e.g. 172.17.0.2 in
Docker) and fail with connect timeout because routing from non-loopback
to loopback doesn't work.

Fix: prepend 127.0.0.1:0 to the bind address list. The connector tries
all bind addresses, so loopback will be attempted first and succeed for
localhost connections.

Benchmark results in Docker (4 threads, 1400B, 10s):
  Ring: 508K pps, MpscTunnelSender::send 138ns
  UDP:  440K pps, MpscTunnelSender::send 294ns
  TCP:  440K pps, MpscTunnelSender::send 376ns

All three tunnel types now converge and benefit from noop_waker sync send.
This commit is contained in:
fanyang
2026-06-28 22:40:52 +08:00
parent d99efba64f
commit 4c7c3d7672
2 changed files with 24 additions and 0 deletions
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easytier/src/connector/mod.rs
+2
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@@ -70,6 +70,8 @@ async fn set_bind_addr_for_peer_connector(
let ips = global_ctx.get_ip_collector().collect_ip_addrs().await;
if is_ipv4 {
let mut bind_addrs = vec![];
// Always include loopback so localhost connections work
bind_addrs.push(std::net::SocketAddr::from(([127, 0, 0, 1], 0)));
for ipv4 in ips.interface_ipv4s {
let socket_addr = SocketAddrV4::new(ipv4.into(), 0).into();
bind_addrs.push(socket_addr);