ACK [SRU T+P] tcp: make challenge acks less predictable

[Luis Henriques]

Stefan Bader <stefan.bader at canonical.com> writes:

> Since this went a bit back and forth before here the final versions
> I would go with. Both based on Ben hutchings 3.2 version. Only for
> 3.13 I changed random32 into prandom_u32.
>
> -Stefan

-- 
Luís
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