netdev - Re: [PATCH] netfilter: don't reset nf_trace in nf

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Message-Id: <20130405.145653.2046071452089341484.davem@davemloft.net>
Date:	Fri, 05 Apr 2013 14:56:53 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	pablo@...filter.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, gaofeng@...fujitsu.com
Subject: Re: [PATCH] netfilter: don't reset nf_trace in nf_reset()

From: Patrick McHardy <kaber@...sh.net>
Date: Fri,  5 Apr 2013 20:42:05 +0200

> Commit 130549fe added code to reset nf_trace in nf_reset(). This is wrong
> and unnecessary.
> 
> nf_reset() is used in the following cases:
> 
> - when passing packets up the the socket layer, at which point we want to
>   release all netfilter references that might keep modules pinned while
>   the packet is queued. nf_trace doesn't matter anymore at this point.
> 
> - when encapsulating or decapsulating IPsec packets. We want to continue
>   tracing these packets after IPsec processing.
> 
> - when passing packets through virtual network devices. Only devices on
>   that encapsulate in IPv4/v6 matter since otherwise nf_trace is not
>   used anymore. Its not entirely clear whether those packets should
>   be traced after that, however we've always done that.
> 
> - when passing packets through virtual network devices that make the
>   packet cross network namespace boundaries. This is the only cases
>   where we clearly want to reset nf_trace and is also what the
>   original patch intended to fix.
> 
> Add a new function nf_reset_trace() and use it in dev_forward_skb() to
> fix this properly.
> 
> Signed-off-by: Patrick McHardy <kaber@...sh.net>

I'll apply this directly because I'm trying to get a pull request out
to Linus.
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