Raising the CMSG_LEN constant for unix

quinn-udp/src/cmsg/mod.rs

@@ -83,6 +83,7 @@ impl<M: MsgHdr> Drop for Encoder<'_, M> {
 /// `cmsg` must refer to a native cmsg containing a payload of type `T`
 pub(crate) unsafe fn decode<T: Copy, C: CMsgHdr>(cmsg: &impl CMsgHdr) -> T {
     assert!(mem::align_of::<T>() <= mem::align_of::<C>());
+    // If you're hitting this, you might need to raise the CMSG_LEN constants
     debug_assert_eq!(cmsg.len(), C::cmsg_len(mem::size_of::<T>()));
     ptr::read(cmsg.cmsg_data() as *const T)
 }

quinn-udp/src/unix.rs

@@ -99,6 +99,11 @@ impl UdpSocketState {
                 unsafe { libc::CMSG_SPACE(mem::size_of::<libc::in6_pktinfo>() as _) as usize };
         }
 
+        if cfg!(target_os = "linux") {
+            cmsg_platform_space +=
+                unsafe { libc::CMSG_SPACE(mem::size_of::<libc::timeval>() as _) as usize };
+        }
+
         assert!(
             CMSG_LEN
                 >= unsafe { libc::CMSG_SPACE(mem::size_of::<libc::c_int>() as _) as usize }
@@ -551,7 +556,7 @@ fn recv(io: SockRef<'_>, bufs: &mut [IoSliceMut<'_>], meta: &mut [RecvMeta]) ->
     Ok(1)
 }
 
-const CMSG_LEN: usize = 88;
+const CMSG_LEN: usize = 96;
 
 fn prepare_msg(
     transmit: &Transmit<'_>,