On Tue, Jun 18, 2019 at 11:46:13AM +0200, Florian Westphal wrote: > Pablo Neira Ayuso <pa...@netfilter.org> wrote: [...] > > Could you describe this problem a bit more? Small example rule plus > > scenario. > > It was what wenxu reported originally: > > nft add rule bridge filter forward ip protocol counter .. > > The rule only matches if the ip packet is contained in an ethernet frame > without vlan tag -- and thats neither expected nor desirable. > > This rule works when using 'meta protocol ip' as dependency instead > of ether type ip (what we do now), because VLAN stripping will fix/alter > skb->protocol to the inner type when the VLAN tag gets removes. > > It will still fail in case there are several VLAN tags, so we might > need another meta expression that can figure out the l3 protocol type.
How would that new meta expression would look like?
