On Wed, 9 Feb 2011 19:17:52 +0100
Veaceslav Falico <vfalico@xxxxxxxxxx> wrote:
> Hello,
>
> I have a host and a VM inside this host bridged. I've set ageing_time and
> forward_delay to 0 and trying to capture all the traffic that goes through that
> bridge from my VM, but it fails to capture the traffic that has dst ether
> address the same as the hosts address (i.e. I can't capture the traffic to the
> host).
>
> From the code, I see that br->ageing_time doesn't really work with local mac
> addresses - has_expired() function never says that a local interface mac address
> is expired, because it verifies if fdb->is_static is set and returns right away.
>
> Is this the desired behaviour? If so, is there a way to capture packets with
> destination to a local interface from another interface?
>
> I've also done a small patch and it seems to fix the situation, but I am not
> sure if it's the right way to do it.
>
>
> Regards,
> Veaceslav
>
> ---
> net/bridge/br_fdb.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
> index 88485cc..3d380c2 100644
> --- a/net/bridge/br_fdb.c
> +++ b/net/bridge/br_fdb.c
> @@ -61,8 +61,8 @@ static inline unsigned long hold_time(const struct net_bridge *br)
> static inline int has_expired(const struct net_bridge *br,
> const struct net_bridge_fdb_entry *fdb)
> {
> - return !fdb->is_static &&
> - time_before_eq(fdb->ageing_timer + hold_time(br), jiffies);
> + return (br->ageing_time == 0) || (!fdb->is_static &&
> + time_before_eq(fdb->ageing_timer + hold_time(br), jiffies));
> }
>
No.
Local addresses should never age.
The proper way to capture packet is to us AF_PACKET or tc actions.
--
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