1 files changed, 15 insertions, 2 deletions
diff --git a/crates/tor-proto/src/stream/flow_ctrl/state.rs b/crates/tor-proto/src/stream/flow_ctrl/state.rs
index 41682fac2..ff51abeba 100644
--- a/crates/tor-proto/src/stream/flow_ctrl/state.rs
+++ b/crates/tor-proto/src/stream/flow_ctrl/state.rs
@@ -52,14 +52,14 @@ impl StreamFlowCtrl {
     #[cfg(feature = "flowctl-cc")]
     pub(crate) fn new_xon_xoff(
         params: Arc<FlowCtrlParameters>,
-        use_sidechannel_mitigations: bool,
+        with_sidechannel_mitigations: WithSidechannelMitigations,
         rate_limit_updater: watch::Sender<StreamRateLimit>,
         drain_rate_requester: NotifySender<DrainRateRequest>,
     ) -> Self {
         Self {
             inner: StreamFlowCtrlInner::XonXoff(XonXoffFlowCtrl::new(
                 params,
-                use_sidechannel_mitigations,
+                with_sidechannel_mitigations,
                 rate_limit_updater,
                 drain_rate_requester,
             )),
@@ -261,6 +261,19 @@ impl StreamRateLimit {
     }
 }
 
+/// Whether sidechannel mitigations are enabled or not for flow control.
+#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+pub(crate) enum WithSidechannelMitigations {
+    /// Flow control sidechannel mitigations are *enabled*.
+    ///
+    /// Should be enabled for clients (including onion services).
+    Enabled,
+    /// Flow control sidechannel mitigations are *disabled*.
+    ///
+    /// Should be disabled for exits.
+    Disabled,
+}
+
 impl std::fmt::Display for StreamRateLimit {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "{} bytes/s", self.rate)