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/usr/share/doc/nftables/examples

Name	Size	Mode	Actions
ct_helpers.nft	1263	0755	edit dl rm
load_balancing.nft	1858	0755	edit dl rm
secmark.nft	2404	0755	edit dl rm
sets_and_maps.nft	1278	0755	edit dl rm

Edit: /usr/share/doc/nftables/examples/sets_and_maps.nft (1278B)

#!/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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