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mptcp: use "middlebox interference" RST when no DSS
RFC8684 suggests use of "Middlebox interference (code 0x06)" in case of fully established subflow that carries data at TCP level with no DSS sub-option. This is generally the case when mpext is NULL or mpext->use_map is 0: use a dedicated value of 'mapping_status' and use it before closing the socket in subflow_check_data_avail(). Link: multipath-tcp/mptcp_net-next#518 Signed-off-by: Davide Caratti <[email protected]> Signed-off-by: Matthieu Baerts (NGI0) <[email protected]> Link: https://patch.msgid.link/[email protected] Signed-off-by: Jakub Kicinski <[email protected]>
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