Block AF_PACKET bound tunnel interface from communication #191
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When binding to the tunnel interface with AF_PACKET, we should not
respond to anything except valid tunnel packets.
vppinit does this by applying a DENYALL ACL.
Individual tunnel chain elements are then responsible for poking a 'hole'
in the DENYALL ACL for themselves. See:
https://github.com/networkservicemesh/sdk-vpp/tree/main/pkg/networkservice/mechanisms/vxlan/vxlanacl
Signed-off-by: Ed Warnicke hagbard@gmail.com