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only allow this to be further processed when bridging is active on that interface, but also if the current packet has a VLAN tag and VLANs are active on our interface. This gives the VLAN layers a chance to also consider the packet (and perhaps drop it instead of the main dispatcher). This fixes a situation where bridging was only active on VLAN interfaces but ether_demux() called on behalf of the main interface had already thrown the packet away. MFC after: 4 weeks
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