netdev - Re: SKB paged fragment lifecycle on receive

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Message-Id: <20110627.154921.1544030815492828408.davem@davemloft.net>
Date:	Mon, 27 Jun 2011 15:49:21 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Ian.Campbell@...citrix.com
Cc:	eric.dumazet@...il.com, jeremy@...p.org, netdev@...r.kernel.org,
	xen-devel@...ts.xensource.com, rusty@...tcorp.com.au
Subject: Re: SKB paged fragment lifecycle on receive

From: Ian Campbell <Ian.Campbell@...citrix.com>
Date: Mon, 27 Jun 2011 15:42:04 +0100

> However it seems like this might still have a problem if your SKBs are
> ever cloned. What happens in this case, e.g if a user of AF_PACKET sends
> a broadcast via a device associated with a bridge[1] (where it would be
> flooded)?

You don't need a bridge to get a clone on transmit, the packet
scheduler can do clones.  Just grep for skb_clone in the packet
action handlers net/sched/act_*.c
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