sctp: convert sack_needed and sack_generation to bits
commit 38ee8fb6 upstream. They don't need to be any bigger than that and with this we start a new bitfield for tracking association runtime stuff, like zero window situation. Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> [ kamal: 3.19-stable prereq for 8a0d19c5 sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING ] Signed-off-by: Kamal Mostafa <kamal@canonical.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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