Re: [PATCHv2] bridge: change BR_GROUPFWD_RESTRICTED to allow forwarding of LLDP frames

David Miller
2015-05-05T23:21:17Z

From: Bernhard Thaler <bernhard.thaler@wvnet.at>
Date: Mon, 4 May 2015 22:47:13 +0200

> BR_GROUPFWD_RESTRICTED bitmask restricts users from setting values to
> /sys/class/net/brX/bridge/group_fwd_mask that allow forwarding of
> some IEEE 802.1D Table 7-10 Reserved addresses:
>
> (MAC Control) 802.3 01-80-C2-00-00-01
> (Link Aggregation) 802.3 01-80-C2-00-00-02
> 802.1AB LLDP 01-80-C2-00-00-0E
>
> Change BR_GROUPFWD_RESTRICTED to allow to forward LLDP frames and document
> group_fwd_mask.
>
> e.g.
> echo 16384 > /sys/class/net/brX/bridge/group_fwd_mask
> allows to forward LLDP frames.
>
> This may be needed for bridge setups used for network troubleshooting or
> any other scenario where forwarding of LLDP frames is desired (e.g. bridge
> connecting a virtual machine to real switch transmitting LLDP frames that
> virtual machine needs to receive).
>
> Tested on a simple bridge setup with two interfaces and host transmitting
> LLDP frames on one side of this bridge (used lldpd). Setting group_fwd_mask
> as described above lets LLDP frames traverse bridge.
>
> Signed-off-by: Bernhard Thaler <bernhard.thaler@wvnet.at>

Applied, thanks.