sctp: add SCTP_EXPOSE_POTENTIALLY_FAILED_STATE sockopt
This is a sockopt defined in section 7.3 of rfc7829: "Exposing the Potentially Failed Path State", by which users can change pf_expose per sock and asoc. The new sockopt SCTP_EXPOSE_POTENTIALLY_FAILED_STATE is also known as SCTP_EXPOSE_PF_STATE for short. v2->v3: - return -EINVAL if params.assoc_value > SCTP_PF_EXPOSE_MAX. - define SCTP_EXPOSE_PF_STATE SCTP_EXPOSE_POTENTIALLY_FAILED_STATE. v3->v4: - improve changelog. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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