From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 12 May 2014 03:22:11 +0000 (-0700)
Subject: tcp: use tcp_v4_send_synack on first SYN-ACK
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~36^2~239^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=843f4a55e336e6d0c7bb92e7f9621535bc8d5fcd;p=pandora-kernel.git

tcp: use tcp_v4_send_synack on first SYN-ACK

To avoid large code duplication in IPv6, we need to first simplify
the complicate SYN-ACK sending code in tcp_v4_conn_request().

To use tcp_v4(6)_send_synack() to send all SYN-ACKs, we need to
initialize the mini socket's receive window before trying to
create the child socket and/or building the SYN-ACK packet. So we move
that initialization from tcp_make_synack() to tcp_v4_conn_request()
as a new function tcp_openreq_init_req_rwin().

After this refactoring the SYN-ACK sending code is simpler and easier
to implement Fast Open for IPv6.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Daniel Lee <longinus00@gmail.com>
Signed-off-by: Jerry Chu <hkchu@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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