fix: make macOS Wi-Fi transmit speed opt-in

Cargo.toml

@@ -44,9 +44,9 @@ objc2-system-configuration = { version = "0.3", default-features = false, featur
 plist = "1.8"
 
 [target.'cfg(target_os = "macos")'.dependencies]
-objc2 = { version = "0.6" }
-objc2-core-wlan = { version = "0.3" }
-objc2-foundation = { version = "0.3" }
+objc2 = { version = "0.6", optional = true }
+objc2-core-wlan = { version = "0.3", optional = true }
+objc2-foundation = { version = "0.3", optional = true }
 
 [target.'cfg(target_os = "ios")'.dependencies]
 dispatch2 = "0.3"
@@ -60,6 +60,7 @@ default = ["gateway", "apple-system-configuration-extra", "android-extra"]
 serde = ["dep:serde", "mac-addr/serde", "ipnet/serde"]
 gateway = []
 android-extra = ["dep:jni", "dep:ndk-context"]
+apple-wifi-extra = ["dep:objc2", "dep:objc2-core-wlan", "dep:objc2-foundation"]
 apple-system-configuration-extra = [
     "objc2-system-configuration/SCPreferences",
     "objc2-system-configuration/SCDynamicStore",

README.md

@@ -53,6 +53,9 @@ For more details, see [examples][examples-url] or [doc][doc-url].
 - `android-extra` (default)
   - Enables deeper Android metadata enrichment using Android platform APIs through JNI bindings.
   - On Android, this can add metadata such as traffic stats, DNS servers, DHCP hints, and Wi-Fi link speed when the app provides the required Android context and permissions.
+- `apple-wifi-extra`
+  - Enables macOS Wi-Fi transmit-speed collection through CoreWLAN.
+  - This feature is disabled by default because CoreWLAN metadata collection may perform synchronous IPC during interface enumeration.
 
 To opt out of the additional Apple metadata enrichment while keeping gateway helpers:
 
@@ -65,6 +68,17 @@ netdev = { version = "0.45", default-features = false, features = ["gateway"] }
 `netdev` links `SystemConfiguration.framework` automatically on `macOS` and `iOS` through its build script.
 If your app is ultimately linked by Xcode, you may still need to add `SystemConfiguration.framework` to the app target manually.
 
+macOS Wi-Fi transmit-speed collection is disabled by default. To enable it, opt in to the
+`apple-wifi-extra` feature:
+
+```toml
+[dependencies]
+netdev = { version = "0.45", features = ["apple-wifi-extra"] }
+```
+
+This uses CoreWLAN, whose metadata lookup may perform synchronous IPC while interfaces are
+being enumerated.
+
 ## Android behavior
 If you want Android-specific values such as DNS servers, DHCP hints, or Wi-Fi link speed, your app may still need to initialize the Android context for Rust and declare Android permissions such as `ACCESS_NETWORK_STATE` and `ACCESS_WIFI_STATE`.
 

src/interface/interface.rs

@@ -74,6 +74,9 @@ pub struct Interface {
     /// This field is usually available on Linux, Android, BSD, Apple targets, and Windows.
     /// It may be `None` for virtual adapters, unsupported drivers, or platforms that do not
     /// expose link speed.
+    ///
+    /// On macOS, collecting Wi-Fi transmit speed through CoreWLAN requires the
+    /// `apple-wifi-extra` feature, which is disabled by default.
     pub transmit_speed: Option<u64>,
     /// Reported receive link speed in bits per second.
     ///

src/os/macos/interface.rs

@@ -1,11 +1,10 @@
 use crate::os::darwin::types::{get_functional_type, interface_type_by_name};
 use crate::os::macos::sc::{get_sc_interface_map, read_sc_plist_interface_map};
+#[cfg(feature = "apple-wifi-extra")]
+use crate::os::macos::wifi::get_wifi_transmit_rate;
 use crate::{
     interface::interface::Interface,
-    os::{
-        macos::sc::SCInterface, macos::wifi::get_wifi_transmit_rate,
-        unix::interface::unix_interfaces,
-    },
+    os::{macos::sc::SCInterface, unix::interface::unix_interfaces},
     prelude::InterfaceType,
 };
 
@@ -44,7 +43,8 @@ pub fn interfaces() -> Vec<Interface> {
             iface.dhcp_v6_enabled = sc_inface.dhcp_v6_enabled;
         }
 
-        if iface.if_type == InterfaceType::Wireless80211 {
+        #[cfg(feature = "apple-wifi-extra")]
+        if iface.if_type == InterfaceType::Wireless80211 && iface.is_up() {
             iface.transmit_speed = get_wifi_transmit_rate(&iface.name);
         }
 

src/os/macos/mod.rs

@@ -1,4 +1,5 @@
 pub mod interface;
 pub mod sc;
 
+#[cfg(feature = "apple-wifi-extra")]
 mod wifi;