netdev - Re: [patch v1, kernel version 3.2.1] rtnetlink workaround around the skb buff size issue

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Date:	Mon, 06 Feb 2012 17:56:06 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	steweg@...t.sk, gregory.v.rose@...el.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [patch v1, kernel version 3.2.1] rtnetlink workaround around
 the skb buff size issue

Le lundi 06 février 2012 à 10:15 -0500, David Miller a écrit :
> From: Štefan Gula <steweg@...t.sk>
> Date: Mon, 6 Feb 2012 09:53:28 +0100
> 
> > If I try to request for it, it will eventually fail with a lot of
> > records even with filtering...
> 
> Then the user can loop increasing the buffer size until the netlink
> request succeeds.
> 
> It is not a problem.

Actually we always truncate message in netlink_recvmsg()

We could use a MSG_NOPARTIAL flag in netlink_recvmsg() so that user can
avoid the MSG_PEEK operation to fetch next message length.

(Ie not consume/copy skb if user buffer is too small to hold full
message, and only return the needed length)



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