[PATCH] mesh: Fix mesh SAE auth on low spec devices

Masashi Honma masashi.honma at gmail.com
Tue Jul 28 09:37:45 EDT 2015


On 2015年07月08日 22:41, Masashi Honma wrote:
> The mesh SAE auth often fails with master branch. By bisect I found
> commit eb5fee0bf50444419ac12d3c7f38f27a47523a47 causes this issue. This does not
> mean the commit has a bug. This is just a CPU resource issue.
>
> After the commit, sae_derive_pwe_ecc() spends 101(msec) on my PC (Intel Atom
> N270 1.6GHz). But dot11RSNASAERetransPeriod is 40(msec). So
> auth_sae_retransmit_timer() is always called and it can causes continuous frame
> exchanges. Before the commit, it was 23(msec).
>
> On the IEEE 802.11 spec, the default value of dot11RSNASAERetransPeriod is
> defined as 40(msec). But it looks short because generally mesh functionality
> will be used on low spec devices. Indeed Raspberry Pi B+
> (ARM ARM1176JZF-S 700MHz) requires 287(msec) for new sae_derive_pwe_ecc().
>
> So this patch makes the default to 1000(msec) and it configurable.
>
> This issue does not occur on infrastructure SAE because the
> dot11RSNASAERetransPeriod is not used on it.
>
> Signed-off-by: Masashi Honma <masashi.honma at gmail.com>

Is there any comment on this patch ?


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