netdev - Re: [Patch net] loopback: explicitly set pkt_type to PACKET

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Message-ID: <CAM_iQpVGG92NMYTJuCXg3yhCkVDyL3Tf=5HJy6n2V1Z89yySzw@mail.gmail.com>
Date:	Fri, 16 May 2014 10:52:09 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Cong Wang <cwang@...pensource.com>
Subject: Re: [Patch net] loopback: explicitly set pkt_type to PACKET_HOST

On Thu, May 15, 2014 at 1:34 PM, David Miller <davem@...emloft.net> wrote:
> From: Cong Wang <xiyou.wangcong@...il.com>
> Date: Wed, 14 May 2014 11:39:22 -0700
>
>> From: Cong Wang <cwang@...pensource.com>
>>
>> In a corner case where I redirect the packets from veth to lo,
>> packets are dropped silently when entering IP stack. This is
>> due to we have a different MAC addr on veth, so the packets are
>> marked as PACKET_OTHERHOST. And after they are redirect to lo,
>> this value is kept since lo has the same MAC addr with the packets.
>> Loopback should explicitly set it to PACKET_HOST before calling
>> eth_type_trans() for this specific case.
>>
>> Cc: David S. Miller <davem@...emloft.net>
>> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
>> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
>> Signed-off-by: Cong Wang <cwang@...pensource.com>
>
> How exactly are you performing this redirection?

Oh, I meant using tc mirred action to redirect packets from vethX to lo.
Sorry for confusing.
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