netdev - Re: [PATCH net-next 00/15] Simplify netfilter and network namespaces

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Message-ID: <alpine.LFD.2.11.1506172216440.2649@ja.home.ssi.bg>
Date:	Wed, 17 Jun 2015 22:38:26 +0300 (EEST)
From:	Julian Anastasov <ja@....bg>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	Juanjo Ciarlante <jjciarla@...z.uncu.edu.ar>,
	Wensong Zhang <wensong@...ux-vs.org>,
	Simon Horman <horms@...ge.net.au>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH net-next 00/15] Simplify netfilter and network
 namespaces


	Hello,

On Sun, 14 Jun 2015, Eric W. Biederman wrote:

> This patshset roots out all of the very weird network namespace
> computation logic (except for the code in ipvs) and fixes it.  I really
> don't like how the code has been essentially guessing  which network
> namespace to use.
> 
> Probably the worst guessing is in ipvs in the function skb_net. I have
> some preliminary changes to fix ipvs but they are not quite ready yet.
> Cleaning up ipvs enough that I can kill skb_net is on my short list.

	For IPVS skb_net is too complicated. One of
the first things we do in hook handler is to check
skb_dst, so even now dev_net(skb_dst(skb)->dev) should
work. sock_net is used for administration via netlink,
skb_net is not used there (ip_vs_ctl.c).

	As for removing/replacing skb_net, ip_vs_conn_net()
is ok when cp is present, we have also svc->net, otherwise
we can store net into struct ip_vs_iphdr, it is filled by
ip_vs_fill_iph_skb from small number of places when hook
handler is entered.

Regards

--
Julian Anastasov <ja@....bg>
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