vxlan: allow multiple VXLANs with same VNI for IPv6 link-local addresses
As link-local addresses are only valid for a single interface, we can allow to use the same VNI for multiple independent VXLANs, as long as the used interfaces are distinct. This way, VXLANs can always be used as a drop-in replacement for VLANs with greater ID space. This also extends VNI lookup to respect the ifindex when link-local IPv6 addresses are used, so using the same VNI on multiple interfaces can actually work. Signed-off-by: NMatthias Schiffer <mschiffer@universe-factory.net> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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