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Editing File: /usr/share/doc/nftables/examples/secmark.nft

#!/usr/sbin/nft -f

# This example file shows how to use secmark labels with the nftables framework.
# This script is meant to be loaded with `nft -f <file>`
# You require linux kernel >= 4.20 and nft >= 0.9.3
# This example is SELinux based, for the secmark objects you require
# SELinux enabled and a SELinux policy defining the stated contexts
# For up-to-date information please visit https://wiki.nftables.org

flush ruleset

table inet filter {
	secmark ssh_server {
		"system_u:object_r:ssh_server_packet_t:s0"
	}

secmark dns_client {
		"system_u:object_r:dns_client_packet_t:s0"
	}

secmark http_client {
		"system_u:object_r:http_client_packet_t:s0"
	}

secmark https_client {
		"system_u:object_r:http_client_packet_t:s0"
	}

secmark ntp_client {
		"system_u:object_r:ntp_client_packet_t:s0"
	}

secmark icmp_client {
		"system_u:object_r:icmp_client_packet_t:s0"
	}

secmark icmp_server {
		"system_u:object_r:icmp_server_packet_t:s0"
	}

secmark ssh_client {
		"system_u:object_r:ssh_client_packet_t:s0"
	}

secmark git_client {
		"system_u:object_r:git_client_packet_t:s0"
	}

map secmapping_in {
		type inet_service : secmark
		elements = { 22 : "ssh_server" }
	}

map secmapping_out {
		type inet_service : secmark
		elements = { 22 : "ssh_client", 53 : "dns_client", 80 : "http_client", 123 : "ntp_client", 443 : "http_client", 9418 : "git_client" }
	}

chain input {
		type filter hook input priority 0;

# label new incoming packets and add to connection
		ct state new meta secmark set tcp dport map @secmapping_in
		ct state new meta secmark set udp dport map @secmapping_in
		ct state new ip protocol icmp meta secmark set "icmp_server"
		ct state new ip6 nexthdr icmpv6 meta secmark set "icmp_server"
		ct state new ct secmark set meta secmark

# set label for est/rel packets from connection
		ct state established,related meta secmark set ct secmark
	}

chain output {
		type filter hook output priority 0;

# label new outgoing packets and add to connection
		ct state new meta secmark set tcp dport map @secmapping_out
		ct state new meta secmark set udp dport map @secmapping_out
		ct state new ip protocol icmp meta secmark set "icmp_client"
		ct state new ip6 nexthdr icmpv6 meta secmark set "icmp_client"
		ct state new ct secmark set meta secmark

# set label for est/rel packets from connection
		ct state established,related meta secmark set ct secmark
	}
}

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