fix: send ETH_P_ALL in htons format

Author: tzneal

src/sys/socket/mod.rs

@@ -117,6 +117,12 @@ impl TryFrom<i32> for SockType {
     }
 }
 
+/// htons_i32 converts the lower 16 bits of the value into network order and 
+/// returns it as an i32.  e.g. 0x0000ABCD => 0x0000CDAB
+const fn htons_i32(v: i32) -> i32 {
+    (v as u16).to_be() as i32
+}
+
 /// Constants used in [`socket`](fn.socket.html) and [`socketpair`](fn.socketpair.html)
 /// to specify the protocol to use.
 #[repr(i32)]
@@ -217,7 +223,7 @@ pub enum SockProtocol {
     // The protocol number is fed into the socket syscall in network byte order.
     #[cfg(any(target_os = "android", target_os = "linux"))]
     #[cfg_attr(docsrs, doc(cfg(all())))]
-    EthAll = libc::ETH_P_ALL.to_be(),
+    EthAll = htons_i32(libc::ETH_P_ALL),
 }
 
 #[cfg(any(target_os = "linux"))]