netdev - Re: [PATCH 2/13] bridge: Allow tail-call on br_pass_frame

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 27 Feb 2010 23:36:07 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, shemminger@...tta.com
Subject: Re: [PATCH 2/13] bridge: Allow tail-call on br_pass_frame_up

On Sat, Feb 27, 2010 at 03:14:51AM -0800, David Miller wrote:
> From: Herbert Xu <herbert@...dor.apana.org.au>
> Date: Fri, 26 Feb 2010 23:35:07 +0800
> 
> > @@ -20,9 +20,9 @@
> >  /* Bridge group multicast address 802.1d (pg 51). */
> >  const u8 br_group_address[ETH_ALEN] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
> >  
> > -static void br_pass_frame_up(struct net_bridge *br, struct sk_buff *skb)
> > +static int br_pass_frame_up(struct sk_buff *skb)
> >  {
> > -	struct net_device *indev, *brdev = br->dev;
> > +	struct net_device *indev, *brdev = BR_INPUT_SKB_CB(skb)->brdev;
> >  
> 
> You use this new BR_INPUT_SKB_CB() here in patch #2, but you only
> start setting ->brdev it in patch #4.

Actually this patch does work as is.  The brdev setting in #4 is
for the bridge device's local xmit path.  br_pass_frame_up is not
used on the local xmit path (since that would create a packet loop).

It's only used for packets originating from bridge ports, where
patch #2 ensures that BR_INPUT_SKB_CB is set correctly.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html