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    SubjectRe: [PATCH] TCP: add option for silent port knocking with integrity protection
    On Thu, Dec 12, 2013 at 06:34:24AM -0800, Eric Dumazet wrote:
    > With various proposals (like TCP minion), maybe its time to be able to
    > implement part of TCP stack in user land (Keep the mux inside the
    > kernel, and forward raw incoming packets to user land where all the
    > crazy things can be done without kernel patching.)

    Maybe this knocking scheme is implementable with a socket filter and we could
    add a switch to tweak drop behaviour.



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