netdev - [net-next-2.6 PATCH v7 5/7 RFC] TCPCT part 1e: implement socket option TCP_COOKIE

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Message-ID: <4B06AC2C.3070102@gmail.com>
Date:	Fri, 20 Nov 2009 09:48:12 -0500
From:	William Allen Simpson <william.allen.simpson@...il.com>
To:	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: [net-next-2.6 PATCH v7 5/7 RFC] TCPCT part 1e: implement socket option
 TCP_COOKIE_TRANSACTIONS

Provide per socket control of the TCP cookie option and SYN/SYNACK data.

This is a straightforward re-implementation of an earlier (year-old)
patch that no longer applies cleanly, with permission of the original
author (Adam Langley):

    http://thread.gmane.org/gmane.linux.network/102586

The principle difference is using a TCP option to carry the cookie nonce,
instead of a user configured offset in the data.

Allocations have been rearranged to avoid requiring GFP_ATOMIC.

Requires:
   net: TCP_MSS_DEFAULT, TCP_MSS_DESIRED
   TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE_TRANSACTIONS
   TCPCT part 1d: define TCP cookie option, extend existing struct's

Signed-off-by: William.Allen.Simpson@...il.com
---
  net/ipv4/tcp.c |  133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
  1 files changed, 131 insertions(+), 2 deletions(-)

View attachment "TCPCT+1e7.patch" of type "text/plain" (4407 bytes)