mptcp: add MSG_PEEK support
This patch adds support for MSG_PEEK flag. Packets are not removed from the receive_queue if MSG_PEEK set in recv() system call. Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Yonglong Li <liyonglong@chinatelecom.cn> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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