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

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Message-Id: <20100817.172602.193696444.davem@davemloft.net>
Date:	Tue, 17 Aug 2010 17:26:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	horms@...ge.net.au
Cc:	ja@....bg, linux-kernel@...r.kernel.org, lvs-devel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, kaber@...sh.net,
	tingsrain@...il.com
Subject: Re: [patch nf-next] IPVS: ICMPv6 checksum calculation

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.
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