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#!/usr/sbin/nft -f
# Start with clean NAT table
flush table nat
{% if helper_functions == 'remove' %}
# NAT if going to be disabled - remove rules and targets from nftables
delete rule ip raw PREROUTING handle {{ pre_ct_ignore }}
delete rule ip raw PREROUTING handle {{ pre_ct_conntrack }}
delete rule ip raw OUTPUT handle {{ out_ct_ignore }}
delete rule ip raw OUTPUT handle {{ out_ct_conntrack }}
delete chain ip raw NAT_CONNTRACK
{% elif helper_functions == 'add' %}
# NAT if enabled - add targets to nftables
add chain ip raw NAT_CONNTRACK
add rule ip raw NAT_CONNTRACK counter accept
add rule ip raw PREROUTING position {{ pre_ct_ignore }} counter jump VYATTA_CT_HELPER
add rule ip raw PREROUTING position {{ pre_ct_conntrack }} counter jump NAT_CONNTRACK
add rule ip raw OUTPUT position {{ out_ct_ignore }} counter jump VYATTA_CT_HELPER
add rule ip raw OUTPUT position {{ out_ct_conntrack }} counter jump NAT_CONNTRACK
{% endif %}
{% for r in destination -%}
{% set chain = "PREROUTING" %}
{% set dst_addr = "ip daddr " + r.dest_address if r.dest_address %}
{% set dst_port = "dport { " + r.dest_port +" }" %}
{% set trns_addr = r.translation_address %}
{% set trns_port = ":" + r.translation_port if r.translation_port %}
{% set trns = "dnat to " + trns_addr + trns_port if trns_port %}
{% set comment = "DST-NAT-" + r.number %}
{% set iface = "iifname " + r.interface_in %}
{% if r.log %}
{% if r.exclude %}
{% set log = "[" + comment + "-EXCL]" %}
{% elif r.translation_address == 'masquerade' %}
{% set log = "[" + comment + "-MASQ]" %}
{% else %}
{% set log = "[" + comment + "]" %}
{% endif %}
{% endif %}
{% if r.exclude %}
{# rule has been marked as "exclude" thus we simply return here #}
{% set trns = "return" %}
{% endif %}
{% if r.protocol == 'tcp_udp' %}
{# Special handling for protocol tcp_udp which is represented as two individual rules #}
{% if log %}
add rule ip nat {{ chain }} {{ iface }} tcp {{ dst_port }} counter log prefix "{{ log }}" comment "{{ comment }} tcp_udp"
{% endif %}
add rule ip nat {{ chain }} {{ iface }} tcp {{ dst_port }} counter {{ trns }} comment {{ comment }}
{% if log %}
add rule ip nat {{ chain }} {{ iface }} udp {{ dst_port }} counter log prefix "{{ log }}" comment "{{ comment }} tcp_udp"
{% endif %}
add rule ip nat {{ chain }} {{ iface }} udp {{ dst_port }} counter {{ trns }} comment {{ comment }}
{% else %}
{% if log %}
add rule ip nat {{ chain }} {{ iface }} {{ r.protocol }} counter log prefix "{{ log }}" comment {{ comment }}
{% endif %}
add rule ip nat {{ chain }} {{ iface }} {{ dst_addr }} {{ r.protocol }} {{ dst_port }} counter {{ trns }} comment {{ comment }}
{% endif %}
{% endfor %}
{% for r in source -%}
{% if r.log %}
{% if r.exclude %}
{% set value = 'EXCL' %}
{% elif r.translation_address == 'masquerade' %}
{% set value = 'MASQ' %}
{% endif %}
add rule ip nat POSTROUTING oifname "{{ r.interface_out }}" ip saddr {{ r.source_address }} counter log prefix "[NAT-SRC-{{ r.number }}-{{ value }}]" comment "SRC-NAT-{{ r.number }}"
{% endif %}
{% if r.exclude %}
{% set value = 'return' %}
{% elif r.translation_address == 'masquerade' %}
{% set value = 'masquerade' %}
{% else %}
{% set value = 'snat to ' + r.translation_address %}
{% endif %}
add rule ip nat POSTROUTING oifname "{{ r.interface_out }}" ip saddr {{ r.source_address }} counter {{ value }} comment "SRC-NAT-{{ r.number }}"
{% endfor %}
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