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[client] Use native windows sock opts to avoid routing loops (#4314)

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- Move `util/grpc` and `util/net` to `client` so `internal` packages can be accessed
 - Add methods to return the next best interface after the NetBird interface.
- Use `IP_UNICAST_IF` sock opt to force the outgoing interface for the NetBird `net.Dialer` and `net.ListenerConfig` to avoid routing loops. The interface is picked by the new route lookup method.
- Some refactoring to avoid import cycles
- Old behavior is available through `NB_USE_LEGACY_ROUTING=true` env var
This commit is contained in:
Viktor Liu
2025-09-20 09:31:04 +02:00
committed by GitHub
parent 90577682e4
commit 55126f990c
77 changed files with 1180 additions and 606 deletions
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client/internal/engine.go
+2
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@@ -446,6 +446,8 @@ func (e *Engine) Start(netbirdConfig *mgmProto.NetbirdConfig, mgmtURL *url.URL)
return fmt.Errorf("up wg interface: %w", err)
}
// if inbound conns are blocked there is no need to create the ACL manager
if e.firewall != nil && !e.config.BlockInbound {
e.acl = acl.NewDefaultManager(e.firewall)