From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [net-next-2.6 PATCH 1/4] TCPCT part 1: initial SYN exchange
 with SYNACK data
Date: Wed, 14 Oct 2009 23:15:40 -0700 (PDT)
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From: William Allen Simpson <william.allen.simpson@gmail.com>
Date: Thu, 15 Oct 2009 01:28:59 -0400

> Pass optional function parameters associated with sending SYNACK.
> These parameters are not needed after sending SYNACK, and are not
> used for retransmission.  Avoids extending struct tcp_request_sock,
> and avoids allocating kernel memory.

This callback is generic and isn't designed to take opaque
data.  All the other arguments to this callback are strongly
typed, and this is on purpose.

You'll need to find another way to implement this.