netdev - Re: [PATCH v3] ipv6: Fix protocol resubmission

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Date:	Wed, 10 Jun 2015 10:53:32 -0500
From:	Josh Hunt <johunt@...mai.com>
To:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	Hajime Tazaki <thehajime@...il.com>, davem@...emloft.net
CC:	kuznet@....inr.ac.ru, jmorris@...ei.org, kaber@...sh.net,
	netdev@...r.kernel.org, sergei.shtylyov@...entembedded.com,
	tom@...bertland.com
Subject: Re: [PATCH v3] ipv6: Fix protocol resubmission


On 06/10/2015 10:23 AM, Josh Hunt wrote:
> On 06/10/2015 10:16 AM, YOSHIFUJI Hideaki wrote:
>> Hi,
>>
>> Josh Hunt wrote:
>>>
>>> Hajime
>>>
>>> Thanks for the report. I mentioned in an earlier post this might be a
>>> problem.
>>>
>>> Dave, what if we restore the old behavior, but add a new label to
>>> handle the case where the decapsulating protocol returns the nexthdr
>>> value? Allowing for migration over to this method over time. I've
>>> pasted in a patch doing so below.
>>
>> I think it is insufficient because IPv6 stack already uses
>> positive value, 0 and negative values.
>>
>
> Where does it use a negative value?
>
> ret is only checked to be > or == to 0. I don't see any checks or code
> handling a return value of < 0 prior to my patch.
>
> If something does return a negative value should it since nothing
> happens with it?

Looking at the code again, I guess we don't increment
IPSTATS_MIB_INDELIVERS if we get a negative return value prior to my patch.

If so, then I guess we have to fix this in the udp path like you were 
suggesting. I will look at this and propose a patch to revert my 
original change and update the v6 udp code.

Josh
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