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Allow withholding the SYN|ACK packet by user code #863

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Allow withholding the SYN|ACK packet by user code #863

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Commits on Nov 30, 2023

  1. Allow withholding the SYN|ACK packet by user code 

    In certain use cases, it's desirable to not send a SYN|ACK packet
immediately after receiving a SYN -- for example, a TCP proxy that
doesn't want to do so until it's connected to the end destination,
because the outgoing connection might get refused. (Currently, you have
to send a SYN|ACK and then reset the connection afterwards in this
case.)

To fix this, add a simple `synack_paused` flag, controllable by user
code, that withholds SYN|ACK packets in `SynReceived` state until it is
unset.
    @eeeeeta
    eeeeeta committed Nov 30, 2023
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