netdev - Re: [PATCH net-next,v2 01/24] net: resolve forwarding path from virtual netdevice and HW destination address

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Date:   Thu, 25 Mar 2021 00:07:02 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     netfilter-devel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>, Andrew Lunn <andrew@...n.ch>,
        Vladimir Oltean <olteanv@...il.com>,
        Tobias Waldekranz <tobias@...dekranz.com>,
        Felix Fietkau <nbd@....name>
Subject: Re: [PATCH net-next,v2 01/24] net: resolve forwarding path from virtual netdevice and HW destination address

On Wed, Mar 24, 2021 at 11:03:54AM +0100, Pablo Neira Ayuso wrote:
> 
> For this scenario specifically, it should be possible extend the
> existing flowtable netlink API to allow hostapd to flush entries in
> the flowtable for the client changing AP.

The APs are external, are we going to install hostapd to them, and
let them inform the gateway? They may not even run Linux.
Roaming can happen in a wired LAN too, see Vladimir's commit message
90dc8fd36078 ("net: bridge: notify switchdev of disappearance of old FDB entry upon migration").

I think the fastpath should monitor roaming (called "FDB migration" in
that commit) events, and update/flush the flowtable accordingly.