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Merge branch 'mptcp-add-REUSEADDR-REUSEPORT-V6ONLY-setsockopt-support'
Florian Westphal says: ==================== mptcp: add REUSEADDR/REUSEPORT/V6ONLY setsockopt support restarting an mptcp-patched sshd yields following error: sshd: error: Bind to port 22 on 0.0.0.0 failed: Address already in use. sshd: error: setsockopt IPV6_V6ONLY: Operation not supported sshd: error: Bind to port 22 on :: failed: Address already in use. sshd: fatal: Cannot bind any address. This series adds support for the needed setsockopts: First patch skips the generic SOL_SOCKET handler for MPTCP: in mptcp case, the setsockopt needs to alter the tcp socket, not the mptcp parent socket. Second patch adds minimal SOL_SOCKET support: REUSEPORT and REUSEADDR. Rest is still handled by the generic SOL_SOCKET code. Last patch adds IPV6ONLY support. This makes ipv6 work for openssh: It creates two listening sockets, before this patch, binding the ipv6 socket will fail because the port is already bound by the ipv4 one. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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