From: Eric Dumazet <eric.dumazet@gmail.com>
To: Jun Zhao <mypopydev@gmail.com>
Cc: monstr@monstr.eu, David Miller <davem@davemloft.net>,
John Williams <john.williams@petalogix.com>,
netdev@vger.kernel.org
Subject: Re: ICMP packets - ll_temac with Microblaze
Date: Wed, 21 Dec 2011 17:05:43 +0100 [thread overview]
Message-ID: <1324483543.2301.19.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> (raw)
In-Reply-To: <1324483302.6471.3.camel@barry.pixelworks.com>
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.
next prev parent reply other threads:[~2011-12-21 16:05 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-21 10:11 ICMP packets - ll_temac with Microblaze Michal Simek
2011-12-21 10:28 ` Eric Dumazet
2011-12-21 10:30 ` Michal Simek
2011-12-21 10:30 ` Eric Dumazet
2011-12-21 10:32 ` Michal Simek
2011-12-21 10:37 ` Eric Dumazet
2011-12-21 10:41 ` Michal Simek
2011-12-21 10:45 ` Eric Dumazet
2011-12-21 10:54 ` Michal Simek
2011-12-21 11:05 ` Eric Dumazet
2011-12-21 11:03 ` Eric Dumazet
2011-12-21 11:10 ` Michal Simek
2011-12-21 11:13 ` Eric Dumazet
2011-12-21 11:50 ` Michal Simek
2011-12-21 12:39 ` Eric Dumazet
2011-12-21 13:28 ` Michal Simek
2011-12-21 13:40 ` Eric Dumazet
2011-12-21 14:24 ` Michal Simek
2011-12-21 15:30 ` Eric Dumazet
2011-12-21 15:44 ` Eric Dumazet
2011-12-21 16:01 ` Jun Zhao
2011-12-21 16:05 ` Eric Dumazet [this message]
2011-12-21 16:11 ` Jun Zhao
2011-12-21 16:39 ` David Laight
2011-12-21 16:50 ` Eric Dumazet
2011-12-21 15:59 ` Eric Dumazet
2011-12-21 17:11 ` Eric Dumazet
2011-12-21 20:55 ` David Miller
2011-12-22 7:49 ` Michal Simek
2011-12-22 7:57 ` Eric Dumazet
2011-12-22 8:05 ` Michal Simek
2011-12-22 10:32 ` Michael Wang
2011-12-22 10:46 ` Eric Dumazet
2011-12-22 13:01 ` Michael Wang
2011-12-22 13:21 ` Eric Dumazet
2011-12-22 13:42 ` Michael Wang
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