netdev - Re: ICMP packets - ll_temac with Microblaze

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Date:	Thu, 22 Dec 2011 00:11:46 +0800
From:	Jun Zhao <mypopydev@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	monstr@...str.eu, David Miller <davem@...emloft.net>,
	John Williams <john.williams@...alogix.com>,
	netdev@...r.kernel.org
Subject: Re: ICMP packets - ll_temac with Microblaze

On Wed, 2011-12-21 at 17:05 +0100, Eric Dumazet wrote:
> Le jeudi 22 décembre 2011 à 00:01 +0800, Jun Zhao a écrit :
> 
> > Why receive buffer size MUST bigger than the jumbo frames size even if
> > the packet size is small?
> 
> Thats the way it is in linux.
> 
> We count the memory size used by the packet.
> 
> If not, a malicious attacker could send 1-byte frames and exhaust your
> kernel memory.
> 
> If you want to reduce it, you might use copybreak : Some drivers copy
> the data into a small skb instead of providing a jumbo frame to upper
> stack.
> 
> tg3 for example.
> 
> 
> 

Eric Dumazet:

I got it, thanks for you explanation. 

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