wgengine/magicsock: add TS_DEBUG_NEVER_DIRECT_UDP debug knob (#17094)

Updates tailscale/corp#30903 Signed-off-by: Jordan Whited <jordan@tailscale.com>
2025-09-10 16:48:40 -07:00
parent 32bfd72752
commit fb9d9ba86e
3 changed files with 7 additions and 0 deletions
@@ -1286,6 +1286,9 @@ func (de *endpoint) startDiscoPingLocked(ep epAddr, now mono.Time, purpose disco
 	if runtime.GOOS == "js" {
 		return
 	}
+	if debugNeverDirectUDP() && !ep.vni.IsSet() && ep.ap.Addr() != tailcfg.DerpMagicIPAddr {
+		return
+	}
 	epDisco := de.disco.Load()
 	if epDisco == nil {
 		return