Re: [PATCH net] netfilter: Use consistent ct id hash calculation

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Dirk Morris <dmorris@xxxxxxxxxxxx> wrote:
> On 8/7/19 4:45 PM, Florian Westphal wrote:
> > So Pablos suggestion above should work just fine.
> > Dirk, can you spin a v2 with that change?
> > 
> 
> Yes, will do tomorrow.

Thanks.

> Also, just an idea, I also played around with just adding
> u32 id to struct nf_conn and just calculating the hash inside
> __nf_conntack_alloc when initialized or even lazily in nf_ct_get_id.
> This seems to work fine and you don't have to worry about anything changing
> and only calculate the hash once.
> 
> I'm presuming this method was avoided for some reason, like keeping the struct
> size to a minimum.

Yes, exactly.

If we go for storing id in the struct we could also just use a random
value rather than computing a hash.



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