netdev - Re: PATCH: fix bridged 802.3ad bonding

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Date:	Tue, 3 Jun 2008 21:55:19 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jay Vosburgh <fubar@...ibm.com>
Cc:	Jiri Bohac <jbohac@...e.cz>, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>
Subject: Re: PATCH: fix bridged 802.3ad bonding

On Tue, 03 Jun 2008 14:22:08 -0700
Jay Vosburgh <fubar@...ibm.com> wrote:

> Stephen Hemminger <shemminger@...ux-foundation.org> wrote:
> 
> >On Tue, 3 Jun 2008 21:32:27 +0200
> >Jiri Bohac <jbohac@...e.cz> wrote:
> [...]
> >> But I think I found a much nicer fix for the problem:
> >> 
> >> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> >> --- a/net/bridge/br_input.c
> >> +++ b/net/bridge/br_input.c
> >> @@ -136,6 +136,10 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
> >>  		if (skb->protocol == htons(ETH_P_PAUSE))
> >>  			goto drop;
> >>  
> >> +		/* Don't touch SLOW frames (LACP, etc.) */
> >> +		if (skb->protocol == htons(ETH_P_SLOW))
> >> +			return skb;
> >> +
> >>  		/* Process STP BPDU's through normal netif_receive_skb() path */
> >>  		if (p->br->stp_enabled != BR_NO_STP) {
> >>  			if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
> >> 
> >> The LACP frames always have the link-local destination MAC
> >> address and so they are not handled by the bridge anyway. They
> >> are only dropped, unless STP is turned on. So let's just not drop
> >> the SLOW packets. Does this look better?
> >> 


I prefer the following because it process all link-local frames through
the normal input path. This means the frames will:
	* be filterable by netfilter
	* processed by af_packet users
	* not forwarded across bridge (this is important).


--- a/net/bridge/br_input.c	2008-06-03 21:44:54.000000000 -0700
+++ b/net/bridge/br_input.c	2008-06-03 21:52:20.000000000 -0700
@@ -135,15 +135,12 @@ struct sk_buff *br_handle_frame(struct n
 		/* Pause frames shouldn't be passed up by driver anyway */
 		if (skb->protocol == htons(ETH_P_PAUSE))
 			goto drop;
-
-		/* Process STP BPDU's through normal netif_receive_skb() path */
-		if (p->br->stp_enabled != BR_NO_STP) {
-			if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
-				    NULL, br_handle_local_finish))
-				return NULL;
-			else
-				return skb;
-		}
+
+		if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+			    NULL, br_handle_local_finish))
+			return NULL;	/* frame consumed by filter */
+		else
+			return skb;	/* continue processing */
 	}
 
 	switch (p->state) {
--
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