On Thu, 2015-05-21 at 12:41 -0700, Yuchung Cheng wrote:
> It'd be nice to count SYN and SYNACKs for apps tracking the handshake stats.
> For syn-cookies we can't do much. But for the rest we can account
> req->num_retrans for SYN-ACKs sent, and perhaps track SYN received in
> request sock?
Well, this is partly because we can not guarantee the behavior that I
chose to explicitly state that we were not tracking SYNACK for passive
sessions.
Also TCP_DEFER_ACCEPT comes into play here...
If we want to handle this in a deterministic way, we would have to add
some bit to warn the application reading tcp_info that the session was
initiated after a valid syncookie was received, and that initial value
of tcp_info.tcpi_segs_{in|out} can be wrong.
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