Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933553Ab0GOPWQ (ORCPT ); Thu, 15 Jul 2010 11:22:16 -0400 Received: from stinky.trash.net ([213.144.137.162]:46881 "EHLO stinky.trash.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933463Ab0GOPWP (ORCPT ); Thu, 15 Jul 2010 11:22:15 -0400 Message-ID: <4C3F27A2.3030207@trash.net> Date: Thu, 15 Jul 2010 17:22:10 +0200 From: Patrick McHardy User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.10) Gecko/20100621 Fedora/3.0.5-1.fc13 Thunderbird/3.0.5 MIME-Version: 1.0 To: "Michael S. Tsirkin" CC: "Daniel P. Berrange" , Jes Sorensen , "David S. Miller" , Jan Engelhardt , Randy Dunlap , netfilter-devel@vger.kernel.org, netfilter@vger.kernel.org, coreteam@netfilter.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCHv4] netfilter: add CHECKSUM target References: <20100715115217.GA6737@redhat.com> In-Reply-To: <20100715115217.GA6737@redhat.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1155 Lines: 27 Am 15.07.2010 13:52, schrieb Michael S. Tsirkin: > This adds a `CHECKSUM' target, which can be used in the iptables mangle > table. > > You can use this target to compute and fill in the checksum in > a packet that lacks a checksum. This is particularly useful, > if you need to work around old applications such as dhcp clients, > that do not work well with checksum offloads, but don't want to > disable checksum offload in your device. > > The problem happens in the field with virtualized applications. > For reference, see Red Hat bz 605555, as well as > http://www.spinics.net/lists/kvm/msg37660.html > > Typical expected use (helps old dhclient binary running in a VM): > iptables -A POSTROUTING -t mangle -p udp --dport bootpc \ > -j CHECKSUM --checksum-fill > > Signed-off-by: Michael S. Tsirkin > Includes fixes by Jan Engelhardt Applied, thanks Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/