netdev - Re: [PATCH v3 net 2/9] bridge: Fix the way to insert new local fdb entries in br_fdb

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Message-ID: <20140207093127.56f78187@samsung-9>
Date:	Fri, 7 Feb 2014 09:31:27 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:	"David S . Miller" <davem@...emloft.net>,
	Vlad Yasevich <vyasevic@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v3 net 2/9] bridge: Fix the way to insert new local fdb
 entries in br_fdb_changeaddr

On Fri,  7 Feb 2014 16:48:19 +0900
Toshiaki Makita <makita.toshiaki@....ntt.co.jp> wrote:

> Since commit bc9a25d21ef8 ("bridge: Add vlan support for local fdb entries"),
> br_fdb_changeaddr() has inserted a new local fdb entry only if it can
> find old one. But if we have two ports where they have the same address
> or user has deleted a local entry, there will be no entry for one of the
> ports.
> 
> Example of problematic case:
>   ip link set eth0 address aa:bb:cc:dd:ee:ff
>   ip link set eth1 address aa:bb:cc:dd:ee:ff
>   brctl addif br0 eth0
>   brctl addif br0 eth1 # eth1 will not have a local entry due to dup.

I think the second addif should fail, it doesn't seem valid to have
two interfaces on same bridge with same address. Most hardware switches
would disable the port in that case.
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