net: add conversions for unix SocketAddr (#6868)

tokio/src/net/unix/socketaddr.rs

@@ -2,6 +2,10 @@ use std::fmt;
 use std::path::Path;
 
 /// An address associated with a Tokio Unix socket.
+///
+/// This type is a thin wrapper around [`std::os::unix::net::SocketAddr`]. You
+/// can convert to and from the standard library `SocketAddr` type using the
+/// [`From`] trait.
 pub struct SocketAddr(pub(super) std::os::unix::net::SocketAddr);
 
 impl SocketAddr {
@@ -29,3 +33,15 @@ impl fmt::Debug for SocketAddr {
         self.0.fmt(fmt)
     }
 }
+
+impl From<std::os::unix::net::SocketAddr> for SocketAddr {
+    fn from(value: std::os::unix::net::SocketAddr) -> Self {
+        SocketAddr(value)
+    }
+}
+
+impl From<SocketAddr> for std::os::unix::net::SocketAddr {
+    fn from(value: SocketAddr) -> Self {
+        value.0
+    }
+}