netdev - Re: [RFC] bridge: add netfilter hook for forwarding 802.1D group addresses

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Message-ID: <4E4FD338.5080100@pandora.be>
Date:	Sat, 20 Aug 2011 17:31:04 +0200
From:	Bart De Schuymer <bdschuym@...dora.be>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	David Lamparter <equinox@...c24.net>,
	Nick Carter <ncarter100@...il.com>,
	Ed Swierk <eswierk@...switch.com>, netdev@...r.kernel.org,
	bridge@...ux-foundation.org, netfilter-devel@...r.kernel.org
Subject: Re: [RFC] bridge: add netfilter hook for forwarding 802.1D group
 addresses

Op 19/08/2011 22:58, Stephen Hemminger schreef:

> Signed-off-by: Stephen Hemminger<shemminger@...tta.com>
>
> ---
>   include/linux/netfilter_bridge.h      |    5 ++++-
>   net/bridge/br_input.c                 |   15 ++++++++++++---
>   net/bridge/netfilter/ebtable_filter.c |   18 ++++++++++++++++--
>   3 files changed, 32 insertions(+), 6 deletions(-)
>
> --- a/include/linux/netfilter_bridge.h	2011-08-19 13:11:51.972125670 -0700
> +++ b/include/linux/netfilter_bridge.h	2011-08-19 13:13:36.452130443 -0700
> @@ -22,7 +22,10 @@
>   #define NF_BR_POST_ROUTING	4
>   /* Not really a hook, but used for the ebtables broute table */
>   #define NF_BR_BROUTING		5
> -#define NF_BR_NUMHOOKS		6
> +/* Packets to link local multicast addresses (01-80-C2-00-00-XX) */
> +#define NF_BR_LINK_LOCAL_IN	6
> +
> +#define NF_BR_NUMHOOKS		7
>

You will need to make sure you don't break backwards compatibility with 
the ebtables userspace tool. ebtables.h::struct ebt_replace is a 
structure used for communication between userspace and the kernel. It 
has the member hook_entry defined like this:
struct ebt_entries __user *hook_entry[NF_BR_NUMHOOKS];

cheers,
Bart



-- 
Bart De Schuymer
www.artinalgorithms.be
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