LVS
lvs-devel
Google
 
Web LinuxVirtualServer.org

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

To: Julian Anastasov <ja@xxxxxx>
Subject: Re: [patch nf-next] IPVS: ICMPv6 checksum calculation
Cc: linux-kernel@xxxxxxxxxxxxxxx, lvs-devel@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, Patrick McHardy <kaber@xxxxxxxxx>, Xiaoyu Du <tingsrain@xxxxxxxxx>
From: Simon Horman <horms@xxxxxxxxxxxx>
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:
> 
>       Hello,
> 
> On Tue, 17 Aug 2010, Simon Horman wrote:
> 
> > From: Xiaoyu Du <tingsrain@xxxxxxxxx>
> > 
> > Correct the ICMPv6 checksum calculation when IPv6 is is used
> > 
> > Signed-off-by: Xiaoyu Du <tingsrain@xxxxxxxxx>
> > Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
> > 
> > ---
> >  net/netfilter/ipvs/ip_vs_core.c |    6 +++++-
> >  1 files changed, 5 insertions(+), 1 deletions(-)
> > 
> > I wonder if this is -stable or .35 material.
> > 
> > diff --git a/net/netfilter/ipvs/ip_vs_core.c 
> > b/net/netfilter/ipvs/ip_vs_core.c
> > index 4f8ddba..124a1ae 100644
> > --- a/net/netfilter/ipvs/ip_vs_core.c
> > +++ b/net/netfilter/ipvs/ip_vs_core.c
> > @@ -638,8 +638,12 @@ void ip_vs_nat_icmp_v6(struct sk_buff *skb,
> > struct ip_vs_protocol *pp,
> > 
> >     /* And finally the ICMP checksum */
> >     icmph->icmp6_cksum = 0;
> > -   /* TODO IPv6: is this correct for ICMPv6? */
> 
>       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;
> 
> >     ip_vs_checksum_complete(skb, icmp_offset);
> > +   icmph->icmp6_cksum = csum_ipv6_magic(&iph->saddr,
> > +                   &iph->daddr,
> > +                   skb->len - icmp_offset, IPPROTO_ICMPV6,
> > +                   skb->csum);
> > +
> >     skb->ip_summed = CHECKSUM_UNNECESSARY;
> > 
> >     if (inout)
> 
> Regards
> 
> --
> Julian Anastasov <ja@xxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe lvs-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

<Prev in Thread] Current Thread [Next in Thread>