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#!/usr/sbin/nft -f
{% macro nptv6_rule(rule,config, chain) %}
{% set src_prefix = "ip6 saddr " + config.source.prefix if config.source is defined and config.source.prefix is defined and config.source.prefix is not none %}
{% set dest_address = "ip6 daddr " + config.destination.address if config.destination is defined and config.destination.address is defined and config.destination.address is not none %}
{% if chain == "PREROUTING" %}
{% set interface = " iifname \"" + config.inbound_interface + "\"" if config.inbound_interface is defined and config.inbound_interface != 'any' else '' %}
{% if config.translation.address | is_ip_network %}
{# support 1:1 network translation #}
{% set dnat_type = "dnat prefix to " %}
{% else %}
{% set dnat_type = "dnat to " %}
{% endif %}
{% set trns_address = dnat_type + config.translation.address if config.translation is defined and config.translation.address is defined and config.translation.address is not none %}
{% elif chain == "POSTROUTING" %}
{% if config.translation is defined and config.translation.address is defined and config.translation.address is not none %}
{% if config.translation.address == 'masquerade' %}
{% set trns_address = config.translation.address %}
{% else %}
{% if config.translation.address | is_ip_network %}
{# support 1:1 network translation #}
{% set snat_type = "snat prefix to " %}
{% else %}
{% set snat_type = "snat to " %}
{% endif %}
{% set trns_address = snat_type + config.translation.address %}
{% endif %}
{% endif %}
{% set interface = " oifname \"" + config.outbound_interface + "\"" if config.outbound_interface is defined else '' %}
{% endif %}
{% set comment = "NPT-NAT-" + rule %}
{% if rule.log %}
{% set base_log = "[NPT-DST-" + rule %}
{% set log = base_log + "]" %}
{% endif %}
{% set output = "add rule ip6 nat " + chain + interface %}
{# 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 %}
{% set log_output = output + " log prefix \"" + log + "\" comment \"" + comment + "\"" %}
{% endif %}
{% if src_prefix %}
{% set output = output + " " + src_prefix %}
{% endif %}
{% if dest_address %}
{% set output = output + " " + dest_address %}
{% endif %}
{% if trns_address %}
{% set output = output + " " + trns_address %}
{% endif %}
{% if comment %}
{% set output = output + " comment \"" + comment + "\"" %}
{% endif %}
{{ log_output if log_output }}
{{ output }}
{% endmacro %}
# Start with clean NAT table
flush table ip6 nat
{% if helper_functions == 'remove' %}
{# NAT if going to be disabled - remove rules and targets from nftables #}
{% set base_command = "delete rule ip6 raw" %}
{{base_command}} PREROUTING handle {{ pre_ct_conntrack }}
{{base_command}} OUTPUT handle {{ out_ct_conntrack }}
delete chain ip6 raw NAT_CONNTRACK
{% elif helper_functions == 'add' %}
{# NAT if enabled - add targets to nftables #}
add chain ip6 raw NAT_CONNTRACK
add rule ip6 raw NAT_CONNTRACK counter accept
{% set base_command = "add rule ip6 raw" %}
{{ base_command }} PREROUTING position {{ pre_ct_conntrack }} counter jump NAT_CONNTRACK
{{ base_command }} OUTPUT position {{ out_ct_conntrack }} counter jump NAT_CONNTRACK
{% endif %}
#
# Destination NAT66 rules build up here
#
{% if destination is defined and destination.rule is defined and destination.rule is not none %}
{% for rule, config in destination.rule.items() if config.disable is not defined %}
{{ nptv6_rule(rule, config, 'PREROUTING') }}
{% endfor %}
{% endif %}
#
# Source NAT66 rules build up here
#
{% if source is defined and source.rule is defined and source.rule is not none %}
{% for rule, config in source.rule.items() if config.disable is not defined %}
{{ nptv6_rule(rule, config, 'POSTROUTING') }}
{% endfor %}
{% endif %}
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