mptcp: consolidate initial ack seq generation
Currently the initial ack sequence is generated on demand whenever it's requested and the remote key is handy. The relevant code is scattered in different places and can lead to multiple, unneeded, crypto operations. This change consolidates the ack sequence generation code in a single helper, storing the sequence number at the subflow level. The above additionally saves a few conditional in fast-path and will simplify the upcoming fast-open implementation. Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Reviewed-by: NMatthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: NMatthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: NJakub Kicinski <kuba@kernel.org>
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