netdev - Re: [net-next PATCH] net: increase fragment memory usage limits

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Message-Id: <20130116.152723.2071191500595279932.davem@davemloft.net>
Date:	Wed, 16 Jan 2013 15:27:23 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	brouer@...hat.com
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [net-next PATCH] net: increase fragment memory usage limits

From: Jesper Dangaard Brouer <brouer@...hat.com>
Date: Tue, 15 Jan 2013 18:16:35 +0100

> Increase the amount of memory usage limits for incomplete
> IP fragments.
> 
> Arguing for new thresh high/low values:
> 
>  High threshold = 4 MBytes
>  Low  threshold = 3 MBytes
 ...
> An attack could send small fragments, the smallest packet I could send
> resulted in a truesize of 896 bytes (I'm a little surprised by this).

This 896 is probably 512 for the memory block used by the driver
to back the memory, plus the sk_buff et al. overhead.

 ...
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

Applied, thanks.
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