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Sergey Kandaurov
920dc099c1
When configured, it enables Multipath TCP support on a listen socket.
As of now it works on Linux starting with Linux 5.6 and glibc 2.32,
where it is enabled with an IPPROTO_MPTCP socket(2) protocol.
To avoid EADDRINUSE errors in bind() and listen() when transitioning
between sockets with different protocols, SO_REUSEPORT is set on both
sockets. See f7f1607bf for potential implications.
Based on previous work by Maxime Dourov and Anthony Doeraene.