linux-kernel - Re: [PATCH] bridge: fix netfilter/NF_BR_LOCAL

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Message-ID: <20141102220145.GA25604@gondor.apana.org.au>
Date:	Mon, 3 Nov 2014 06:01:46 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Linus Lüssing <linus.luessing@....de>
Cc:	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bridge: fix netfilter/NF_BR_LOCAL_OUT for own, locally
 generated queries

On Mon, Sep 22, 2014 at 01:32:44AM +0200, Linus Lüssing wrote:
> Ebtables on the OUTPUT chain (NF_BR_LOCAL_OUT) would not work as expected
> for both locally generated IGMP and MLD queries. The IP header specific
> filter options are off by 14 Bytes for netfilter (actual output on
> interfaces is fine).
> 
> NF_HOOK() expects the skb->data to point to the IP header, not the
> ethernet one (while dev_queue_xmit() does not). Luckily there is an
> br_dev_queue_push_xmit() helper function already - let's just use that.
> 
> Introduced by eb1d16414339a6e113d89e2cca2556005d7ce919
> ("bridge: Add core IGMP snooping support")
> 
> Ebtables example:
> 
> $ ebtables -I OUTPUT -p IPv6 -o eth1 --logical-out br0 \
> 	--log --log-level 6 --log-ip6 --log-prefix="~EBT: " -j DROP
> 
> before (broken):
> 
> ~EBT:  IN= OUT=eth1 MAC source = 02:04:64:a4:39:c2 \
> 	MAC dest = 33:33:00:00:00:01 proto = 0x86dd IPv6 \
> 	SRC=64a4:39c2:86dd:6000:0000:0020:0001:fe80 IPv6 \
> 	DST=0000:0000:0000:0004:64ff:fea4:39c2:ff02, \
> 	IPv6 priority=0x3, Next Header=2
> 
> after (working):
> 
> ~EBT:  IN= OUT=eth1 MAC source = 02:04:64:a4:39:c2 \
> 	MAC dest = 33:33:00:00:00:01 proto = 0x86dd IPv6 \
> 	SRC=fe80:0000:0000:0000:0004:64ff:fea4:39c2 IPv6 \
> 	DST=ff02:0000:0000:0000:0000:0000:0000:0001, \
> 	IPv6 priority=0x0, Next Header=0
> 
> Signed-off-by: Linus Lüssing <linus.luessing@....de>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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