netdev - [net-next-2.6 PATCH v5 4/5 RFC] TCPCT part1d: generate Responder Cookie

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Message-ID: <4AF84867.7010802@gmail.com>
Date:	Mon, 09 Nov 2009 11:50:47 -0500
From:	William Allen Simpson <william.allen.simpson@...il.com>
To:	Linux Kernel Network Developers <netdev@...r.kernel.org>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [net-next-2.6 PATCH v5 4/5 RFC] TCPCT part1d: generate Responder
 Cookie

Define (missing) hash message size for SHA1.

Define hashing size constants specific to TCP cookies, and add new function.

Maintain global secret values for tcp_cookie_generator().

This is a significantly revised implementation of earlier (15-year-old)
Photuris [RFC-2522] code for the KA9Q cooperative multitasking platform.

Linux RCU technique appears to be well-suited to this application, though
neither of the circular queue items are freed.

These functions will also be used in subsequent patches that implement
additional features.

Signed-off-by: William.Allen.Simpson@...il.com
---
  include/linux/cryptohash.h |    1 +
  include/net/tcp.h          |    8 +++
  net/ipv4/tcp.c             |  146 ++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 155 insertions(+), 0 deletions(-)

View attachment "TCPCT+1d5.patch" of type "text/plain" (6996 bytes)