netdev - Re: PROBLEM: GRE forwarding not working with 3.10.x, WCCPv2 and Cisco 7200 Router showing IP0 bad-hlen 4 in tcpdump

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Message-ID: <CALnjE+pdvpfCTo=bTtSrY29mxc0yZKMj0XSc2gQVhGjbpByhcA@mail.gmail.com>
Date:	Fri, 25 Oct 2013 08:25:57 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Peter Schmitt <peter.schmitt82@...oo.de>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: PROBLEM: GRE forwarding not working with 3.10.x, WCCPv2 and Cisco
 7200 Router showing IP0 bad-hlen 4 in tcpdump

Hi Peter,
I think its easy to fix this case, Can you try attached patch?
If it works I will send formal patch for stable.

Thanks,
Pravin.

On Fri, Oct 18, 2013 at 4:39 AM, Peter Schmitt <peter.schmitt82@...oo.de> wrote:
> Hi,
>
>
>
>> On Thursday, October 17, 2013 3:44 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> > On Thu, 2013-10-17 at 11:53 +0100, Peter Schmitt wrote:
>>>  Hi,
>>>
>>>
>>>  >
>>>  > 3.10 is buggy (for ETH_P_WCCP support I mean), 3.11 has the probable
>>>  > fix :
>>>  >
>>>  > commit 3d7b46cd20e300bd6989fb1f43d46f1b9645816e
>>>  > ("ip_tunnel: push generic protocol handling to ip_tunnel
>> module.")
>>>  >
>>>  > The problem is 3.10 do not pull the extra 4 bytes of WCCP
>>>  >
>>>  > This is now properly done in iptunnel_pull_header()
>>>  >
>>>
>>>  First of all, many thanks for your help on this.
>>>
>>>  I tried to apply the fix to the 3.10.16 sources, as I would like to
>>>  stay with the long-term line. Unfortunately it does not apply, as
>>>  there are a lot of dependencies on other patches.
>>>
>>>  Do you think there will be a fix for the long-time 3.10 kernel line?
>>>  Or can you guide me on how to apply this fix to the long-term kernel?
>>
>> 3.10 is right in the middle of GRE refactoring, and many bugs are in it.
>>
>> It might be very painful to get a complete list of patches to backport.
>
> thanks again. Yes I saw that there were lots of changes.
>
> Do you think there will be a fix for all the 3.10.x stable long term kernel users? Many of them might not be able to use some newer kernel easily or will this be a "won't fix"?
>
> Best regards,
> Peter
>

View attachment "0001-ip_gre-Fix-WCCPv2-header-parsing.patch" of type "text/x-patch" (2787 bytes)