From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: SYN attack, with FIN flag set Date: Sat, 03 Dec 2011 11:02:02 +0100 Message-ID: <1322906522.2762.108.camel@edumazet-laptop> References: <1755dc626dee301261ef4fe4cd66fd47@visp.net.lb> <1322897233.2762.79.camel@edumazet-laptop> <1322898902.2762.81.camel@edumazet-laptop> <1322902401.2762.85.camel@edumazet-laptop> <4ED9E5FA.30204@msgid.tls.msk.ru> <73da1a18b48dc3097acd6728be208c66@visp.net.lb> <1322905302.2762.106.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: David Miller , Michael Tokarev , netdev@vger.kernel.org To: Denys Fedoryshchenko Return-path: Received: from mail-bw0-f46.google.com ([209.85.214.46]:49094 "EHLO mail-bw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754070Ab1LCKCG (ORCPT ); Sat, 3 Dec 2011 05:02:06 -0500 Received: by bkbzv3 with SMTP id zv3so79247bkb.19 for ; Sat, 03 Dec 2011 02:02:04 -0800 (PST) In-Reply-To: <1322905302.2762.106.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: Le samedi 03 d=C3=A9cembre 2011 =C3=A0 10:41 +0100, Eric Dumazet a =C3=A9= crit : > [PATCH] tcp: drop SYN+FIN messages >=20 > Denys Fedoryshchenko reported that SYN+FIN attacks were bringing his > linux machines to their limits. >=20 > Dont call conn_request() if the TCP flags includes SYN flag >=20 Oh well this should be : Dont call conn_request() if the TCP flags includes FIN flag