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

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Date:   Mon, 12 Apr 2021 13:42:49 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Roi Dayan <roid@...dia.com>
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 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).