mptcp: add REUSEADDR/REUSEPORT support
This will e.g. make 'sshd restart' work when MPTCP is used, as we will now set this option on the listener socket instead of only the mptcp socket (where it has no effect). We still need to copy the setting to the master socket so that a subsequent getsockopt() returns the expected value. Reported-by: NChristoph Paasch <cpaasch@apple.com> Suggested-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NFlorian Westphal <fw@strlen.de> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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