From: Cong Wang <cwang@twopensource.com>
To: Daniel Mack <daniel@zonque.org>
Cc: Florian Westphal <fw@strlen.de>,
Daniel Borkmann <dborkman@redhat.com>,
Alexey Perevalov <a.perevalov@samsung.com>,
Pablo Neira Ayuso <pablo@netfilter.org>,
netdev <netdev@vger.kernel.org>
Subject: Re: cgroup matches in INPUT chain
Date: Fri, 20 Mar 2015 13:55:11 -0700 [thread overview]
Message-ID: <CAHA+R7MrL4kW5W=1LZFzXzkb1zWUxHRXHwjjnksScWF1ZMHswQ@mail.gmail.com> (raw)
In-Reply-To: <550C4901.4070001@zonque.org>
On Fri, Mar 20, 2015 at 9:21 AM, Daniel Mack <daniel@zonque.org> wrote:
> On 03/20/2015 05:11 PM, Florian Westphal wrote:
>> Daniel Mack <daniel@zonque.org> wrote:
>>> In my simple test setup, when skbs are dequeued by process_backlog(),
>>> they have skb->_skb_refdst set, and hence ip_rcv_finish() does not call
>>> into early_demux() prior to iterating the INPUT chain:
>>
>> Yes, because we already have a route set.
>>
>> Are we talking about loopback?
>
> I'm testing this on the lookback device, but I've seen similar behavior
> on external interfaces too. However, I fail to see a pattern in that.
>
Loopback is special because the skb->dst is kept across TX and RX.
How possible is your external interface sets dst for the packets?
Are you using a tunnel device or you have some other setup you didn't mention?
next prev parent reply other threads:[~2015-03-20 20:55 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-19 18:41 cgroup matches in INPUT chain Daniel Mack
2015-03-19 18:58 ` Florian Westphal
2015-03-20 13:57 ` Daniel Mack
2015-03-20 16:11 ` Florian Westphal
2015-03-20 16:21 ` Daniel Mack
2015-03-20 20:18 ` Daniel Borkmann
2015-03-20 20:55 ` Cong Wang [this message]
2015-03-20 22:07 ` Daniel Mack
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