netdev - Re: [RFC] tcp demux used to signal ip_route_input

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Message-Id: <20120627.011933.1879095015412784000.davem@davemloft.net>
Date:	Wed, 27 Jun 2012 01:19:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [RFC] tcp demux used to signal ip_route_input_noref to not
 cache dst

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 27 Jun 2012 10:18:24 +0200

> On Wed, 2012-06-27 at 09:52 +0200, Eric Dumazet wrote:
> 
>> I'll test the following patch in a moment.
>> 
>> For the moment, set nocache to true for all frames not associated to an
>> ESTABLISHED socket. Not sure we want to test SYN flag after all.
>> 
>>  include/net/protocol.h |    2 +-
>>  include/net/route.h    |    8 ++++----
>>  include/net/tcp.h      |    2 +-
>>  net/ipv4/arp.c         |    2 +-
>>  net/ipv4/ip_fragment.c |    2 +-
>>  net/ipv4/ip_input.c    |    5 +++--
>>  net/ipv4/route.c       |    8 +++++---
>>  net/ipv4/tcp_ipv4.c    |    4 +++-
>>  net/ipv4/xfrm4_input.c |    2 +-
>>  9 files changed, 20 insertions(+), 15 deletions(-)
> 
> Excellent results.
> 
> I am now able to resist to DDOS synflood attacks, with no route cache
> pollution, and no more rt_garbage_collect() hits.

Sweet.
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