netdev - Re: [PATCH 2/2] [SK_BUFF]: Introduce skb_copy_from_linear_data{

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Message-ID: <46098B74.8060404@trash.net>
Date:	Tue, 27 Mar 2007 23:24:04 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] [SK_BUFF]: Introduce skb_copy_from_linear_data{_offset}

Arnaldo Carvalho de Melo wrote:
> On 3/27/07, David Miller <davem@...emloft.net> wrote:
> 
>> From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
>> Date: Tue, 27 Mar 2007 16:41:48 -0300
>>
>> > +static inline void skb_move_linear_data(const struct sk_buff *skb,
>> > +                                     const int from_offset,
>> > +                                     const int to_offset,
>> > +                                     const unsigned int len)
>> > +{
>> > +     memcpy(skb->data + to_offset, skb->data + from_offset, len);
>> > +}
>> > +
>>
>> What do you intend to use this for?  There are no users in
>> your patch, and I'd be fearful of overlapping cases (which
>> ought to be common for anything using this) which therefore
>> would require use of memmove() instead of memcpy().
>>
>> How about we just leave out interfaces until we have a use
>> case?
> 
> 
> I don't want to intend anything with this, was just a brain fart, a
> failed attempt to convince me that this was needed, I apologise for
> letting this sleep thru, will remove and resubmit, ok?


nf_nat_helper.c:mangle_content() could make use of this, but it
would need memmove. Something to do this with non-linear packets
would be even cooler :)
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