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#!/usr/sbin/nft -f
{% macro nat_rule(rule, config, chain) %}
{% set comment = '' %}
{% set base_log = '' %}
{% if chain is vyos_defined('PREROUTING') %}
{% set comment = 'STATIC-NAT-' ~ rule %}
{% set base_log = '[NAT-DST-' ~ rule %}
{% set interface = ' iifname "' ~ config.inbound_interface ~ '"' if config.inbound_interface is vyos_defined and config.inbound_interface is not vyos_defined('any') else '' %}
{% if config.translation.address is vyos_defined %}
{# support 1:1 network translation #}
{% if config.translation.address | is_ip_network %}
{% set trns_addr = 'dnat ip prefix to ip daddr map { ' ~ config.destination.address ~ ' : ' ~ config.translation.address ~ ' }' %}
{# we can now clear out the dst_addr part as it's already covered in aboves map #}
{% else %}
{% set dst_addr = 'ip daddr ' ~ config.destination.address if config.destination.address is vyos_defined %}
{% set trns_addr = 'dnat to ' ~ config.translation.address %}
{% endif %}
{% endif %}
{% elif chain is vyos_defined('POSTROUTING') %}
{% set comment = 'STATIC-NAT-' ~ rule %}
{% set base_log = '[NAT-SRC-' ~ rule %}
{% set interface = ' oifname "' ~ config.inbound_interface ~ '"' if config.inbound_interface is vyos_defined and config.inbound_interface is not vyos_defined('any') else '' %}
{% if config.translation.address is vyos_defined %}
{# support 1:1 network translation #}
{% if config.translation.address | is_ip_network %}
{% set trns_addr = 'snat ip prefix to ip saddr map { ' ~ config.translation.address ~ ' : ' ~ config.destination.address ~ ' }' %}
{# we can now clear out the src_addr part as it's already covered in aboves map #}
{% else %}
{% set src_addr = 'ip saddr ' ~ config.translation.address if config.translation.address is vyos_defined %}
{% set trns_addr = 'snat to ' ~ config.destination.address %}
{% endif %}
{% endif %}
{% endif %}
{% if config.exclude is vyos_defined %}
{# rule has been marked as 'exclude' thus we simply return here #}
{% set trns_addr = 'return' %}
{% set trns_port = '' %}
{% endif %}
{% if config.translation.options is vyos_defined %}
{% if config.translation.options.address_mapping is vyos_defined('persistent') %}
{% set trns_opts_addr = 'persistent' %}
{% endif %}
{% if config.translation.options.port_mapping is vyos_defined('random') %}
{% set trns_opts_port = 'random' %}
{% elif config.translation.options.port_mapping is vyos_defined('fully-random') %}
{% set trns_opts_port = 'fully-random' %}
{% endif %}
{% endif %}
{% if trns_opts_addr is vyos_defined and trns_opts_port is vyos_defined %}
{% set trns_opts = trns_opts_addr ~ ',' ~ trns_opts_port %}
{% elif trns_opts_addr is vyos_defined %}
{% set trns_opts = trns_opts_addr %}
{% elif trns_opts_port is vyos_defined %}
{% set trns_opts = trns_opts_port %}
{% endif %}
{% set output = 'add rule ip vyos_static_nat ' ~ chain ~ interface %}
{% if dst_addr is vyos_defined %}
{% set output = output ~ ' ' ~ dst_addr %}
{% endif %}
{% if src_addr is vyos_defined %}
{% set output = output ~ ' ' ~ src_addr %}
{% endif %}
{# Count packets #}
{% set output = output ~ ' counter' %}
{# Special handling of log option, we must repeat the entire rule before the #}
{# NAT translation options are added, this is essential #}
{% if log is vyos_defined %}
{% set log_output = output ~ ' log prefix "' ~ log ~ '" comment "' ~ comment ~ '"' %}
{% endif %}
{% if trns_addr is vyos_defined %}
{% set output = output ~ ' ' ~ trns_addr %}
{% endif %}
{% if trns_opts is vyos_defined %}
{% set output = output ~ ' ' ~ trns_opts %}
{% endif %}
{% if comment is vyos_defined %}
{% set output = output ~ ' comment "' ~ comment ~ '"' %}
{% endif %}
{{ log_output if log_output is vyos_defined }}
{{ output }}
{% endmacro %}
# Start with clean STATIC NAT chains
flush chain ip vyos_static_nat PREROUTING
flush chain ip vyos_static_nat POSTROUTING
{# NAT if enabled - add targets to nftables #}
#
# Destination NAT rules build up here
#
add rule ip vyos_static_nat PREROUTING counter jump VYOS_PRE_DNAT_HOOK
{% if static.rule is vyos_defined %}
{% for rule, config in static.rule.items() if config.disable is not vyos_defined %}
{{ nat_rule(rule, config, 'PREROUTING') }}
{% endfor %}
{% endif %}
#
# Source NAT rules build up here
#
add rule ip vyos_static_nat POSTROUTING counter jump VYOS_PRE_SNAT_HOOK
{% if static.rule is vyos_defined %}
{% for rule, config in static.rule.items() if config.disable is not vyos_defined %}
{{ nat_rule(rule, config, 'POSTROUTING') }}
{% endfor %}
{% endif %}
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