linux-kernel - Re: [net-next 12/18] net: mac802154: Handle scan requests

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Date:   Tue, 4 Jan 2022 18:43:40 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Alexander Aring <alex.aring@...il.com>
Cc:     Nicolas Schodet <nico@...fr.eu.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        linux-wpan - ML <linux-wpan@...r.kernel.org>,
        David Girault <david.girault@...vo.com>,
        Romuald Despres <romuald.despres@...vo.com>,
        Frederic Blain <frederic.blain@...vo.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [net-next 12/18] net: mac802154: Handle scan requests

Hi Alexander,

> I see that beacons are sent out with
> "local->beacon.mhr.fc.dest_addr_mode = IEEE802154_NO_ADDRESSING;"
> shouldn't that be a broadcast destination?

In the case of a beacon, 7.3.1.2 Beacon frame MHR field indicate:

	When the Frame Version field is 0b00–0b01:
		— The Destination Addressing mode field shall be set to
		indicated that the Destination Address and Destination
		PAN ID fields are not present.

So I think the NO_ADDRESSING choice here is legit. The destination
field however is useful in the Enhanced beacon frame case, but that's
not yet supported.

Thanks,
Miquèl