netdev - Re: [PATCH net-next 4/4] net/sched: act_mirred: Implement ingress actions

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Date:   Sun, 25 Sep 2016 21:40:55 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Shmulik Ladkani <shmulik.ladkani@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        WANG Cong <xiyou.wangcong@...il.com>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH net-next 4/4] net/sched: act_mirred: Implement ingress
 actions

On 16-09-25 09:35 PM, Florian Westphal wrote:
> Jamal Hadi Salim <jhs@...atatu.com> wrote:

>>
>> Realize didnt respond to this. Seems very simple to fix:
>> if skb->dev->ifindex and m->tcfm_dev->ifindex are the
>> same, then you can drop the packet.
>
> Yes, but I think we get same issue when we deal with stacked
> interfaces, and redirect is to e.g. vlan on top of physical device.
>
> And we have such loops even without tc, for instance when placing
> both veth ends in same bridge :-(


For egress->egress the xmit recursion should help (maybe an
audit needs to be done).
For the case Shmulik is trying to achieve I am not sure that
would help.
In general, catching such a loop (or broadcast), if cheap should
be attempted.

cheers,
jamal