sctp: add sctp_make_op_error_limited and reuse inner functions
The idea is quite similar to the old functions, but note that the _fixed function wasn't "fixed" as in that it would generate a packet with a fixed size, but rather limited/bounded to PMTU. Also, now with sctp_mtu_payload(), we have a more accurate limit. Signed-off-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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