On Mon, Nov 17, 2014 at 12:20:28PM +0100, Linus Lüssing wrote:
> From: Linus Lüssing <linus.luessing@xxxxxx>
>
> 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
Applied, thanks Linus.
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