netdev - Re: [PATCH] ipv6: fix incorrent ipv6 ipsec packet fragment

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Message-ID: <4F67D8AE.2070602@cn.fujitsu.com>
Date:	Tue, 20 Mar 2012 09:09:02 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	davem@...emloft.net, eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] ipv6: fix incorrent ipv6 ipsec packet fragment

于 2012年03月19日 16:02, Steffen Klassert 写道:
> On Fri, Mar 16, 2012 at 04:57:15PM +0800, Gao feng wrote:
>> Since commit 299b0767(ipv6: Fix IPsec slowpath fragmentation problem)
>> In func ip6_append_data,after call skb_put(skb, fraglen + dst_exthdrlen)
>> the skb->len contains dst_exthdrlen,and we don't reduce dst_exthdrlen at last
>> This will make fraggap>0 in next "while cycle",and cause the size of skb incorrent
> 
> Good catch!
> 
>>
>> Call skb_pull reduce skb->len before next "while cycle"
> 
> I think it would be better to just reserve headroom for
> dst_exthdrlen instead of adding and removing data to/from
> the skb.
> 

Hi steffen & David:

Thanks for your comment.
Agree with you,I will send v2 patch.
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