netdev - Re: dhcp client packet sniffing...

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Message-Id: <20100408.051144.183699401.davem@davemloft.net>
Date:	Thu, 08 Apr 2010 05:11:44 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	netdev@...r.kernel.org
Subject: Re: dhcp client packet sniffing...

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Thu, 8 Apr 2010 19:47:38 +0800

> Another approach is to use skb_share.  At some point all protocols
> were designed to handle shared skbs.
> 
> If we could tap into that then it would be an obvious way to
> eliminate the clone.  To do this we'd need to audit all the
> protocols to ensure that they can still handle shared packets
> safely.

I don't even want to call down into the AF_PACKET code for
the case where the filter doesn't pass.

We have the socket pointer etc. already in dev_queue_xmit_nit(), so we
can easily do it.
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