netdev - Re: VLAN packets silently dropped in promiscuous mode

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Date:	Thu, 30 Sep 2010 11:55:32 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Roger Luethi <rl@...lgate.ch>, David Miller <davem@...emloft.net>
Cc:	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 11:16 +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) {


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