netdev - Re: [PATCH] cls_u32: use skb_copy_bits() to dereference data safely

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Date:	Wed, 2 Jun 2010 21:43:14 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	hadi@...erus.ca
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] cls_u32: use skb_copy_bits() to dereference data safely

On Wed, Jun 2, 2010 at 9:36 PM, jamal <hadi@...erus.ca> wrote:
> On Wed, 2010-06-02 at 21:14 +0800, Changli Gao wrote:
>
>
>> Maybe skb_header_pointer() is lighter.
>
> A little worse than skb_copy_bits(). In any case, this change is going
> to hurt.

Why? it is an inline function, and in most cases, there isn't any function call.

> Dave, can we assume the upper layers(qdiscs in this case) are
> responsible for any linearizing?
>
> Changli, if you have time - can you also audit tcf_pedit()
> since it follows TheLinuxWay(tm).
>

Yea, pedit has the same issue. Besides this issue, they should use
get_unaligned() instead.


-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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