From bde65aa239f65de8b58fc5317002b43372483806 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Sun, 23 Nov 2025 22:06:25 +0000
Subject: [PATCH] Fix backpressure issue when TUN is disabled

---
 src/tun/iface.go | 4 +++-
 src/tun/tun.go   | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/tun/iface.go b/src/tun/iface.go
index f1898281..8f26cef2 100644
--- a/src/tun/iface.go
+++ b/src/tun/iface.go
@@ -41,7 +41,9 @@ func (tun *TunAdapter) queue() {
 			tun.log.Errorln("Exiting TUN writer due to core read error:", err)
 			return
 		}
-		tun.ch <- p[:n]
+		if tun.ch != nil {
+			tun.ch <- p[:n]
+		}
 	}
 }
 
diff --git a/src/tun/tun.go b/src/tun/tun.go
index d15a0674..47a44713 100644
--- a/src/tun/tun.go
+++ b/src/tun/tun.go
@@ -125,8 +125,9 @@ func (tun *TunAdapter) _start() error {
 	if tun.config.name == "none" || tun.config.name == "dummy" {
 		tun.log.Debugln("Not starting TUN as ifname is none or dummy")
 		tun.isEnabled = false
+		// Need to keep the queue goroutine running to stop underlying
+		// layers from getting blocked.
 		go tun.queue()
-		go tun.write()
 		return nil
 	}
 	mtu := uint64(tun.config.mtu)