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Date: Sun, 11 Jul 2010 12:21:17 +0300 From: "Michael S. Tsirkin" <mst@...hat.com> To: Herbert Xu <herbert@...dor.hengli.com.au> Cc: Patrick McHardy <kaber@...sh.net>, "David S. Miller" <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, "Pekka Savola (ipv6)" <pekkas@...core.fi>, James Morris <jmorris@...ei.org>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org, coreteam@...filter.org, netdev@...r.kernel.org, kvm@...r.kernel.org Subject: Re: [PATCH] netfilter: add CHECKSUM target On Fri, Jul 09, 2010 at 03:18:14PM +0800, Herbert Xu wrote: > On Fri, Jul 09, 2010 at 01:29:13AM +0300, Michael S. Tsirkin wrote: > > 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 > > an IP 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 68 -j CHECKSUM > > --checksum-fill > > > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com> > > I'd think that this target would be protocol-agnostic, no? Meaning it should go into net/netfilter/? Will do. > Cheers, > -- > Email: Herbert Xu <herbert@...dor.apana.org.au> > Home Page: http://gondor.apana.org.au/~herbert/ > PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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