linux-kernel - Re: [patch nf-next] IPVS: ICMPv6 checksum calculation

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Message-ID: <20100818055716.GA32429@verge.net.au>
Date:	Wed, 18 Aug 2010 14:57:16 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	xiaoyu Du <tingsrain@...il.com>
Cc:	David Miller <davem@...emloft.net>, ja@....bg,
	linux-kernel@...r.kernel.org, lvs-devel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, kaber@...sh.net
Subject: Re: [patch nf-next] IPVS: ICMPv6 checksum calculation

On Wed, Aug 18, 2010 at 12:20:14PM +0800, xiaoyu Du wrote:
> 2010/8/18 David Miller <davem@...emloft.net>:
> > From: Simon Horman <horms@...ge.net.au>
> > Date: Wed, 18 Aug 2010 09:21:49 +0900
> >
> >> [ CCing netdev for comment ]
> >>
> >> On Tue, Aug 17, 2010 at 12:25:56PM +0300, Julian Anastasov wrote:
> >  ...
> >>>      May be ip_vs_checksum_complete() is not needed here?
> >>> Also, skb->csum is not valid for every ip_summed value.
> >>> May be we need to apply CHECKSUM_PARTIAL kind of setup for the IPv6.
> >>> Such example is net/ipv6/udp.c:udp6_ufo_send_check().
> >>> Later dev_queue_xmit() and skb_checksum_help() should take care
> >>> for the next steps. Something like this can be tested:
> >>>
> >>>      icmph->icmp6_cksum = csum_ipv6_magic(&iph->saddr,
> >>>              &iph->daddr,
> >>>              skb->len - icmp_offset, IPPROTO_ICMPV6,
> >>>              0);
> >>>      skb->csum_start = skb_network_header(skb) - skb->head +
> >>>                        icmp_offset;
> >>>      skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
> >>>      skb->ip_summed = CHECKSUM_PARTIAL;
> >>>
> >
> > Yes, using CHECKSUM_PARTIAL unconditionally would work.
> >
> Thanks, I learned this. You gave me a big cake.

[ please don't top-post ]

Xiaoyu, are you in a position to test the code proposed by Julian?
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