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30ff28fdc4
This sysctl is going to be used in the next commits to drop TCP timestamps option, to be able to send an ADD_ADDR with a v6 IP address and a port number. It is enabled by default. This knob is explicitly disabled in the MPTCP Join selftest, with the "signal addr list progresses after tx drop" subtest, to continue verifying the previous behaviour where the ADD_ADDR is not sent due to a lack of space. While at it, move syn_retrans_before_tcp_fallback down from struct mptcp_pernet, to avoid creating another 3 bytes hole. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://patch.msgid.link/20260605-net-next-mptcp-add-addr6-port-ts-v2-4-758e7ca73f4d@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>