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

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Message-ID: <1340785104.26242.9.camel@edumazet-glaptop>
Date:	Wed, 27 Jun 2012 10:18:24 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [RFC] tcp demux used to signal ip_route_input_noref to not
 cache dst

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.




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