Add routing socket type on macOS

Author: pinkisemils

src/sys/socket/addr.rs

@@ -81,6 +81,9 @@ pub enum AddressFamily {
     #[cfg(any(target_os = "android", target_os = "linux"))]
     #[cfg_attr(docsrs, doc(cfg(all())))]
     Netlink = libc::AF_NETLINK,
+    /// Kernel interface for interacting with the routing table
+    #[cfg(target_os = "macos")]
+    Route = libc::PF_ROUTE,
     /// Low level packet interface (see [`packet(7)`](https://man7.org/linux/man-pages/man7/packet.7.html))
     #[cfg(any(
         target_os = "android",
@@ -422,6 +425,8 @@ impl AddressFamily {
             libc::AF_NETLINK => Some(AddressFamily::Netlink),
             #[cfg(any(target_os = "macos", target_os = "macos"))]
             libc::AF_SYSTEM => Some(AddressFamily::System),
+            #[cfg(target_os = "macos")]
+            libc::PF_ROUTE => Some(AddressFamily::Route),
             #[cfg(any(target_os = "android", target_os = "linux"))]
             libc::AF_PACKET => Some(AddressFamily::Packet),
             #[cfg(any(

src/sys/socket/mod.rs

@@ -2462,4 +2462,16 @@ mod tests {
     fn can_use_cmsg_space() {
         let _ = cmsg_space!(u8);
     }
+
+    #[cfg(target_os = "macos")]
+    #[test]
+    fn can_open_routing_socket() {
+        let _ = super::socket(
+            super::AddressFamily::Route,
+            super::SockType::Raw,
+            super::SockFlag::empty(),
+            None,
+        )
+        .expect("Failed to open routing socket");
+    }
 }