new socket option so application can give advice about routing path quality of connected udp sockets, added in linux commit a87cb3e48ee86d29868d3f59cfb9ce1a8fa63314
@@ -222,6 +222,7 @@ struct linger
#define SO_DETACH_BPF SO_DETACH_FILTER
#define SO_ATTACH_REUSEPORT_CBPF 51
#define SO_ATTACH_REUSEPORT_EBPF 52
+#define SO_CNX_ADVICE 53
#ifndef SOL_SOCKET
#define SOL_SOCKET 1