From: ebiederm@xmission.com (Eric W. Biederman)
To: canqun zhang <canqunzhang@gmail.com>
Cc: Gao feng <gaofeng@cn.fujitsu.com>,
netfilter-devel@vger.kernel.org,
"netdev\@vger.kernel.org" <netdev@vger.kernel.org>,
Patrick McHardy <kaber@trash.net>,
pablo@netfilter.org
Subject: Re: [PATCH 01/19] netfilter: move nf_conntrack initialize out of pernet operations
Date: Thu, 27 Dec 2012 22:00:23 -0800 [thread overview]
Message-ID: <8738yqiumg.fsf@xmission.com> (raw)
In-Reply-To: <CAFFEFTU8kxXV2pQ3B_goRs2Y7p2ecZ1YuSKSjfYF_58eD1tDqw@mail.gmail.com> (canqun zhang's message of "Fri, 28 Dec 2012 13:32:29 +0800")
canqun zhang <canqunzhang@gmail.com> writes:
> yes，Network namespaces in general can be cleaned up in any order，but
> when doing /etc/ini.d/iptables restart, the system need cleaning up
> all net namespace,and init_net should be cleanup lastly.init_net is
> the first namespace,other net namespace is copied for it ,and it is
> diuty for Initializing resources,so It in itself is special.
"other net namespaces is copied for it" I don't have a clue what
you mean by that. Every network namespace starts out in a default
state not in a copied state.
Nowhere else in the network stack does &init_net have the duty
of initializing or cleaning up resources.
That /etc/init.d/iptables restart removes modules in general is a little
dubious. That /etc/init.d/iptables restart removes modules when there
are other existing network namespaces using those modules is down right
dangerous. Dangerous in the anyone can ssh into the machine way. I
suspect it has taken 5 years for this bug to show up because it is so
idiotic to remove code that someone else is using.
I won't argue that making it so that &init_net is the last network
namespace to go will solve this problem. But I can't see how adding
the guarantee that &init_net will always be cleaned up last is a good
long term solution.
Removing the init_net special case gives a simpler mental model, and
less to learn and maintain about network namespaces.
Eric
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next prev parent reply other threads:[~2012-12-28 6:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-28 2:36 [PATCH 01/19] netfilter: move nf_conntrack initialize out of pernet operations Gao feng
2012-12-28 2:36 ` [PATCH 02/19] netfilter: expect: move initial codes out of pernet_operations Gao feng
2012-12-28 2:36 ` [PATCH 03/19] netfilter: acct: " Gao feng
2012-12-28 2:36 ` [PATCH 04/19] netfilter: tstamp: " Gao feng
2012-12-28 2:36 ` [PATCH 05/19] netfilter: ecache: " Gao feng
2012-12-28 2:36 ` [PATCH 06/19] netfilter: timeout: " Gao feng
2012-12-28 2:36 ` [PATCH 07/19] netfilter: helper: " Gao feng
2012-12-28 2:36 ` [PATCH 08/19] netfilter: proto: " Gao feng
2012-12-28 2:36 ` [PATCH 09/19] netfilter: l3proto: prepare reworking l3proto support for netns Gao feng
2012-12-28 2:36 ` [PATCH 10/19] netfilter: ipv4: register ipv4 in module_init Gao feng
2012-12-28 2:36 ` [PATCH 10/19] netfilter: ipv4: register l3proto " Gao feng
2012-12-28 2:36 ` [PATCH 11/19] netfilter: ipv6: register l3proto ipv6 " Gao feng
2012-12-28 2:36 ` [PATCH 12/19] netfilter: l4proto: prepare reworking l4proto support for netns Gao feng
2012-12-28 2:36 ` [PATCH 13/19] netfilter: ipv4: move registration codes out of pernet_operations Gao feng
2012-12-28 2:36 ` [PATCH 14/19] netfilter: ipv6: " Gao feng
2012-12-28 2:36 ` [PATCH 15/19] netfilter: sctp: " Gao feng
2012-12-28 2:36 ` [PATCH 16/19] netfilter: udplite: " Gao feng
2012-12-28 2:36 ` [PATCH 17/19] netfilter: dccp: " Gao feng
2012-12-28 2:36 ` [PATCH 18/19] netfilter: gre: " Gao feng
2012-12-28 2:36 ` [PATCH 19/19] netfilter: gre: fix resource leak when unregister gre proto Gao feng
2013-01-05 3:50 ` Pablo Neira Ayuso
2013-01-07 1:27 ` Gao feng
2013-01-07 2:15 ` Pablo Neira Ayuso
2013-01-07 2:38 ` Pablo Neira Ayuso
2013-01-07 2:59 ` Gao feng
2013-01-07 3:05 ` Gao feng
2013-01-07 3:27 ` Pablo Neira Ayuso
2013-01-07 3:43 ` Gao feng
2012-12-28 3:52 ` [PATCH 01/19] netfilter: move nf_conntrack initialize out of pernet operations canqun zhang
2012-12-28 4:48 ` Eric W. Biederman
2012-12-28 5:32 ` canqun zhang
2012-12-28 6:00 ` Eric W. Biederman [this message]
2012-12-28 11:58 ` Pablo Neira Ayuso
2012-12-28 7:16 ` Gao feng
2012-12-28 8:48 ` canqun zhang
2013-01-10 1:03 ` Gao feng
2013-01-10 16:41 ` Pablo Neira Ayuso
2013-01-11 1:01 ` Gao feng
2013-01-13 15:07 ` Pablo Neira Ayuso
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