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This patch added a new member csum_reqd in struct mptcp_out_options and struct mptcp_subflow_request_sock. Initialized it with the helper function mptcp_is_checksum_enabled(). In mptcp_write_options, if this field is enabled, send out the MP_CAPABLE suboption with the MPTCP_CAP_CHECKSUM_REQD flag. Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>