netdev - Re: [Xen-devel] [PATCHv1 net-next] xen-netback: remove unconditional pull_skb

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Date:	Wed, 05 Nov 2014 12:15:11 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	Ian.Campbell@...rix.com
Cc:	zoltan.kiss@...aro.org, david.vrabel@...rix.com,
	netdev@...r.kernel.org, malcolm.crossley@...rix.com,
	wei.liu2@...rix.com, xen-devel@...ts.xenproject.org
Subject: Re: [Xen-devel] [PATCHv1 net-next] xen-netback: remove
 unconditional pull_skb_tail in guest Tx path

From: Ian Campbell <Ian.Campbell@...rix.com>
Date: Wed, 5 Nov 2014 09:51:20 +0000

> Is this also true for things which hit the iptables paths? I suppose
> they must necessarily have already been through the protocol demux stage
> before iptables would even be able to interpret them as e.g. an IP
> packet.

Netfilter often takes a different approach, by using
skb_header_pointer() which returns a direct pointer if the linear area
contains the requested range already, or alternatively copies from the
frags into a user supplied on-stack header buffer if not.
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