netdev - Re: [PATCH] act_mirred: don't go back.

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Date:	Wed, 11 Nov 2009 16:44:48 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	hadi@...erus.ca
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] act_mirred: don't go back.

On Wed, Nov 11, 2009 at 4:11 PM, jamal <hadi@...erus.ca> wrote:
> Hi,
>
> On Tue, 2009-11-10 at 16:50 +0800, Changli Gao wrote:
>
>> Where? After skb2 is allocated, there won't be any failure any more.
>
>
> Sorry, yes, your change does look like an improvement.
> If you can test a little more - please add my sign-off and submit.

OK. I'll do some test first, then send it out for review.

>
>>
>> It's just OK. When using tc, I also found act_mirred doesn't support
>> ingress, then I realized that there isn't any difference between
>> ingress and egress, as it depends on its parent. However I do think it
>> is confused, when it prints:
>> filter parent ffff: protocol ip pref 49152 basic handle 0x1
>>         action order 1: mirred (Egress Redirect to device ifb0) stolen
>>         index 5 ref 1 bind 1.
>> And the TODO note still is in the source code of act_mirred, it do
>> make me wonder for a while!
>
> Well, you know if you have the energy - doing socket redirect would
> be very interesting indeed. Ingress is another beast, it requires some
> thinking and a lot more testing depending on the devices because of
> possible loops.
>

The current kernel and iproute2 support ingress in another way, that
is attaching the filter to the corresponding ingress qdisc. refter to
http://www.linuxfoundation.org/en/Net:IFB . The loops is avoided in
netif_receive_skb() and with TTL mechanism. Do you have more
documentation or examples about socket redirect? Sorry, I don't know
what it is used to do. Is it sth. like ipt_REDIRECT?


-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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