data/templates/firewall/nftables-cgnat.j2


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#!/usr/sbin/nft -f

add table ip cgnat
flush table ip cgnat

add map ip cgnat tcp_nat_map { type ipv4_addr: interval ipv4_addr . inet_service ; flags interval ;}
add map ip cgnat udp_nat_map { type ipv4_addr: interval ipv4_addr . inet_service ; flags interval ;}
add map ip cgnat icmp_nat_map { type ipv4_addr: interval ipv4_addr . inet_service ; flags interval ;}
add map ip cgnat other_nat_map { type ipv4_addr: interval ipv4_addr ; flags interval ;}
flush map ip cgnat tcp_nat_map
flush map ip cgnat udp_nat_map
flush map ip cgnat icmp_nat_map
flush map ip cgnat other_nat_map

table ip cgnat {
    map tcp_nat_map {
        type ipv4_addr : interval ipv4_addr . inet_service
        flags interval
        elements = { {{ proto_map_elements }} }
    }

    map udp_nat_map {
        type ipv4_addr : interval ipv4_addr . inet_service
        flags interval
        elements = { {{ proto_map_elements }} }
    }

    map icmp_nat_map {
        type ipv4_addr : interval ipv4_addr . inet_service
        flags interval
        elements = { {{ proto_map_elements }} }
    }

    map other_nat_map {
        type ipv4_addr : interval ipv4_addr
        flags interval
        elements = { {{ other_map_elements }} }
    }

    chain POSTROUTING {
        type nat hook postrouting priority srcnat; policy accept;
        ip protocol tcp counter snat ip to ip saddr map @tcp_nat_map
        ip protocol udp counter snat ip to ip saddr map @udp_nat_map
        ip protocol icmp counter snat ip to ip saddr map @icmp_nat_map
        counter snat ip to ip saddr map @other_nat_map
    }
}