udp: add gso segment cmsg
Allow specifying segment size in the send call. The new control message performs the same function as socket option UDP_SEGMENT while avoiding the extra system call. [ Export udp_cmsg_send for ipv6. -DaveM ] Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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