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#!/usr/sbin/nft -f # This example file shows how to use sets and maps in the nftables framework. # This script is meant to be loaded with `nft -f <file>` # For up-to-date information please visit https://wiki.nftables.org # symbolic anonymous set definition built from symbolic singleton definitions define int_if1 = eth0 define int_if2 = eth1 define int_ifs = { $int_if1, $int_if2 } define ext_if1 = eth2 define ext_if2 = eth3 define ext_ifs = { $ext_if1, $ext_if2 } # recursive symbolic anonymous set definition define local_ifs = { $int_ifs, $ext_ifs } # symbolic anonymous set definition define tcp_ports = { ssh, domain, https, 123-125 } delete table filter table filter { # named set of type iface_index set local_ifs { type iface_index } # named map of type iface_index : ipv4_addr map nat_map { type iface_index : ipv4_addr } map jump_map { type iface_index : verdict } chain input_1 { counter; } chain input_2 { counter; } chain input { type filter hook input priority 0 # symbolic anonymous sets meta iif $local_ifs tcp dport $tcp_ports counter # literal anonymous set meta iif { eth0, eth1 } counter meta iif @local_ifs counter meta iif vmap @jump_map #meta iif vmap { eth0 : jump input1, eth1 : jump input2 } } }
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