netdev - Re: [PATCH 1/1] bridge: remove BR_GROUPFWD_RESTRICTED for arbitrary forwarding of reserved addresses

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Message-ID: <3581745.3NPUBHfd8z@blindfold>
Date:   Mon, 01 Oct 2018 20:16:22 +0200
From:   Richard Weinberger <richard@....at>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Richard Weinberger <richard.weinberger@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        bernhard.thaler@...et.at, "David S. Miller" <davem@...emloft.net>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        David Gstir <david@...ma-star.at>
Subject: Re: [PATCH 1/1] bridge: remove BR_GROUPFWD_RESTRICTED for arbitrary forwarding of reserved addresses

Florian,

Am Montag, 1. Oktober 2018, 18:24:25 CEST schrieb Florian Fainelli:
> If all you are doing is forwarding anything, one thing I experimented
> with before is the following:
> 
> # tc qdisc add dev eth1 handle ffff: ingress
> # tc qdisc add dev eth3 handle ffff: ingress
> # tc filter add dev eth3 parent ffff: u32 \
> > match u32 0 0 \
> > action mirred egress redirect dev eth1
> # tc filter add dev eth1 parent ffff: u32 \
> > match u32 0 0 \
> > action mirred egress redirect dev eth3
> # ifconfig eth3 promisc
> # ifconfig eth1 promisc
> 
> and this works just fine actually, bypassing the bridge layer entirely.

Yeah, mirred is a powerful knife. :-)

In my case it is too low level since I utilize the netfilter functionality of
the bridge layer.

Thanks,
//richard