netdev - Re: [PATCH next 0/30] Passing net through the netfilter hooks

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Date:	Thu, 17 Sep 2015 18:30:36 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	David Miller <davem@...emloft.net>
Cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH next 0/30] Passing net through the netfilter hooks

Le 16/09/2015 02:59, Eric W. Biederman a écrit :
>
> My primary goal with this patchset and it's follow ups is to cleanup the
> network routing paths so that we do not look at the output device to
> derive the network namespace.  My plan is to pass the network namespace
> of the transmitting socket through the output path, to replace code that
> looks at the output network device today.  Once that is done we can have
> routes with output devices outside of the current network namespace.
> Which should allow reception and transmission of packets in network
> namespaces to be as fast as normal packet reception and transmission
> with early demux disabled, because it will same code path.
>
> Once skb_dst(skb)->dev is a little better under control I think it will
> also be possible to use rcu to cleanup the ancient hack that sets
> dst->dev to loopback_dev when a network device is removed.
>
> The work to get there is a series of code cleanups.  I am starting with
> passing net into the netfilter hooks and into the functions that are
> called after the netfilter hooks.  This removes from netfilter the
> need to guess which network namespace it is working on.
>
> To get there I perform a series of minor prep patches so the big changes
> at the end are possible to audit without getting lost in the noise.  In
> particular I have a lot of patches computing net into a local variable
> and then using it through out the function.
>
> So this patchset encompases removing dead code, sorting out the _sk
> functions that were added last time someone pushed a prototype change
> through the post netfilter functions.  Cleaning up individual functions
> use of the network namespace.  Passing net into the netfilter hooks.
> Passing net into the post netfilter functions.  Using state->net in
> the netfilter code where it is available and trivially usable.
LGTM (except some minor comments).

Acked-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
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