sctp: implement handle_ftsn for sctp_stream_interleave
handle_ftsn is added as a member of sctp_stream_interleave, used to skip ssn for data or mid for idata, called for SCTP_CMD_PROCESS_FWDTSN cmd. sctp_handle_iftsn works for ifwdtsn, and sctp_handle_fwdtsn works for fwdtsn. Note that different from sctp_handle_fwdtsn, sctp_handle_iftsn could do stream abort pd. Signed-off-by: NXin Long <lucien.xin@gmail.com> Acked-by: NMarcelo R. Leitner <marcelo.leitner@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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