netdev - Re: VLAN packets silently dropped in promiscuous mode

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Date:	Thu, 30 Sep 2010 12:40:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Roger Luethi <rl@...lgate.ch>
Cc:	David Miller <davem@...emloft.net>, Jesse Gross <jesse@...ira.com>,
	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>
Subject: Re: VLAN packets silently dropped in promiscuous mode

Le jeudi 30 septembre 2010 à 11:55 +0200, Eric Dumazet a écrit :
> Le jeudi 30 septembre 2010 à 11:16 +0200, Eric Dumazet a écrit :
> 
> > Agreed
> > 
> > Could you try following patch, based on net-next-2.6 ?
> 
> Here is the official patch I cooked for net-2.6 (linux-2.6)
> 
> I tested it successfully with a tg3 NIC.
> 
> Thanks
> 
> [PATCH] vlan: dont drop packets from unknown vlans in promiscuous mode
> 
> Roger Luethi noticed packets for unknown VLANs getting silently dropped
> even in promiscuous mode.
> 
> Check for promiscuous mode in __vlan_hwaccel_rx() and vlan_gro_common()
> before drops.
> 
> Reported-by: Roger Luethi <rl@...lgate.ch>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
>  net/8021q/vlan_core.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
> index 01ddb04..ba502b4 100644
> --- a/net/8021q/vlan_core.c
> +++ b/net/8021q/vlan_core.c
> @@ -24,7 +24,7 @@ int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
>  
>  	if (vlan_dev)
>  		skb->dev = vlan_dev;
> -	else if (vlan_id)
> +	else if (vlan_id && !(skb->dev->flags & IFF_PROMISC))
>  		goto drop;
>  
>  	return (polling ? netif_receive_skb(skb) : netif_rx(skb));
> @@ -102,7 +102,7 @@ vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
>  
>  	if (vlan_dev)
>  		skb->dev = vlan_dev;
> -	else if (vlan_id)
> +	else if (vlan_id && !(skb->dev->flags & IFF_PROMISC))
>  		goto drop;
>  
>  	for (p = napi->gro_list; p; p = p->next) {
> 


Hmm, packets are delivered not only to tcpdump but also on other stacks,
on ethX.

So this is a domain violation.

Patch is not applicable as is.



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