netdev - Re: [PATCH net-next 1/1] netfilter: flowtable: Make sure dst

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Message-ID: <f5568a11-aea9-277d-cabc-8ea6a2987ec1@nvidia.com>
Date:   Tue, 13 Apr 2021 10:58:39 +0300
From:   Roi Dayan <roid@...dia.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
CC:     <netdev@...r.kernel.org>, Oz Shlomo <ozsh@...dia.com>,
        Paul Blakey <paulb@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH net-next 1/1] netfilter: flowtable: Make sure dst_cache is
 valid before using it



On 2021-04-12 2:42 PM, Pablo Neira Ayuso wrote:
> On Mon, Apr 12, 2021 at 11:26:35AM +0300, Roi Dayan wrote:
>>
>>
>> On 2021-04-11 1:58 PM, Pablo Neira Ayuso wrote:
>>> Hi Roi,
>>>
>>> On Sun, Apr 11, 2021 at 11:13:34AM +0300, Roi Dayan wrote:
>>>> It could be dst_cache was not set so check it's not null before using
>>>> it.
>>>
>>> Could you give a try to this fix?
>>>
>>> net/sched/act_ct.c leaves the xmit_type as FLOW_OFFLOAD_XMIT_UNSPEC
>>> since it does not cache a route.
>>>
>>> Thanks.
>>>
>>
>> what do you mean? FLOW_OFFLOAD_XMIT_UNSPEC doesn't exists so default 0
>> is set.
>>
>> do you suggest adding that enum option as 0?
> 
> Yes. This could be FLOW_OFFLOAD_XMIT_TC instead if you prefer.
> 
> enum flow_offload_xmit_type {
>          FLOW_OFFLOAD_XMIT_TC        = 0,
>          FLOW_OFFLOAD_XMIT_NEIGH,
>          FLOW_OFFLOAD_XMIT_XFRM,
>          FLOW_OFFLOAD_XMIT_DIRECT,
> };
> 
> so there is no need to check for no route in the
> FLOW_OFFLOAD_XMIT_NEIGH case (it's assumed this type always has a
> route).
> 

thanks Pablo. were not sure I wanted to touch the enum.
I prefer unspec actually as you suggested initially.
it works fine by adding the enum.

i'll submit v2 with this suggestion.