#!/usr/sbin/nft -f {% macro nat_rule(rule, config, chain) %} {% set comment = '' %} {% set base_log = '' %} {% set src_addr = 'ip saddr ' ~ config.source.address.replace('!','!= ') if config.source.address is vyos_defined %} {% set dst_addr = 'ip daddr ' ~ config.destination.address.replace('!','!= ') if config.destination.address is vyos_defined %} {# negated port groups need special treatment, move != in front of { } group #} {% if config.source.port is vyos_defined and config.source.port.startswith('!=') %} {% set src_port = 'sport != { ' ~ config.source.port.replace('!=','') ~ ' }' %} {% else %} {% set src_port = 'sport { ' ~ config.source.port ~ ' }' if config.source.port is vyos_defined %} {% endif %} {# negated port groups need special treatment, move != in front of { } group #} {% if config.destination.port is vyos_defined and config.destination.port.startswith('!=') %} {% set dst_port = 'dport != { ' ~ config.destination.port.replace('!=','') ~ ' }' %} {% else %} {% set dst_port = 'dport { ' ~ config.destination.port ~ ' }' if config.destination.port is vyos_defined %} {% endif %} {% if chain is vyos_defined('PREROUTING') %} {% set comment = 'DST-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 #} {% set dst_addr = '' %} {% else %} {% set trns_addr = 'dnat to ' ~ config.translation.address %} {% endif %} {% endif %} {% elif chain is vyos_defined('POSTROUTING') %} {% set comment = 'SRC-NAT-' ~ rule %} {% set base_log = '[NAT-SRC-' ~ rule %} {% set interface = ' oifname "' ~ config.outbound_interface ~ '"' if config.outbound_interface is vyos_defined and config.outbound_interface is not vyos_defined('any') else '' %} {% if config.translation.address is vyos_defined %} {% if config.translation.address is vyos_defined('masquerade') %} {% set trns_addr = config.translation.address %} {% if config.translation.port is vyos_defined %} {% set trns_addr = trns_addr ~ ' to ' %} {% endif %} {# support 1:1 network translation #} {% elif config.translation.address | is_ip_network %} {% set trns_addr = 'snat ip prefix to ip saddr map { ' ~ config.source.address ~ ' : ' ~ config.translation.address ~ ' }' %} {# we can now clear out the src_addr part as it's already covered in aboves map #} {% set src_addr = '' %} {% else %} {% set trns_addr = 'snat to ' ~ config.translation.address %} {% endif %} {% endif %} {% endif %} {% set trns_port = ':' ~ config.translation.port if config.translation.port is vyos_defined %} {# protocol has a default value thus it is always present #} {% if config.protocol is vyos_defined('tcp_udp') %} {% set protocol = 'tcp' %} {% set comment = comment ~ ' tcp_udp' %} {% else %} {% set protocol = config.protocol %} {% endif %} {% if config.log is vyos_defined %} {% if config.exclude is vyos_defined %} {% set log = base_log ~ '-EXCL]' %} {% elif config.translation.address is vyos_defined('masquerade') %} {% set log = base_log +'-MASQ]' %} {% else %} {% set log = base_log ~ ']' %} {% 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 %} {# T1083: NAT address and port translation options #} {% 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 nat ' ~ chain ~ interface %} {% if protocol is not vyos_defined('all') %} {% set output = output ~ ' ip protocol ' ~ protocol %} {% endif %} {% if src_addr is vyos_defined %} {% set output = output ~ ' ' ~ src_addr %} {% endif %} {% if src_port is vyos_defined %} {% set output = output ~ ' ' ~ protocol ~ ' ' ~ src_port %} {% endif %} {% if dst_addr is vyos_defined %} {% set output = output ~ ' ' ~ dst_addr %} {% endif %} {% if dst_port is vyos_defined %} {% set output = output ~ ' ' ~ protocol ~ ' ' ~ dst_port %} {% 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_port is vyos_defined %} {# Do not add a whitespace here, translation port must be directly added after IP address #} {# e.g. 192.0.2.10:3389 #} {% set output = output ~ trns_port %} {% 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 }} {# Special handling if protocol is tcp_udp, we must repeat the entire rule with udp as protocol #} {% if config.protocol is vyos_defined('tcp_udp') %} {# Beware of trailing whitespace, without it the comment tcp_udp will be changed to udp_udp #} {{ log_output | replace('tcp ', 'udp ') if log_output is vyos_defined }} {{ output | replace('tcp ', 'udp ') }} {% endif %} {% endmacro %} # Start with clean SNAT and DNAT chains flush chain ip nat PREROUTING flush chain ip nat POSTROUTING {% if helper_functions is vyos_defined('remove') %} {# NAT if going to be disabled - remove rules and targets from nftables #} {% set base_command = 'delete rule ip raw' %} {{ base_command }} PREROUTING handle {{ pre_ct_ignore }} {{ base_command }} OUTPUT handle {{ out_ct_ignore }} {{ base_command }} PREROUTING handle {{ pre_ct_conntrack }} {{ base_command }} OUTPUT handle {{ out_ct_conntrack }} delete chain ip raw NAT_CONNTRACK {% elif helper_functions is vyos_defined('add') %} {# NAT if enabled - add targets to nftables #} add chain ip raw NAT_CONNTRACK add rule ip raw NAT_CONNTRACK counter accept {% set base_command = 'add rule ip raw' %} {{ base_command }} PREROUTING position {{ pre_ct_ignore }} counter jump VYOS_CT_HELPER {{ base_command }} OUTPUT position {{ out_ct_ignore }} counter jump VYOS_CT_HELPER {{ base_command }} PREROUTING position {{ pre_ct_conntrack }} counter jump NAT_CONNTRACK {{ base_command }} OUTPUT position {{ out_ct_conntrack }} counter jump NAT_CONNTRACK {% endif %} # # Destination NAT rules build up here # add rule ip nat PREROUTING counter jump VYOS_PRE_DNAT_HOOK {% if destination.rule is vyos_defined %} {% for rule, config in destination.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 nat POSTROUTING counter jump VYOS_PRE_SNAT_HOOK {% if source.rule is vyos_defined %} {% for rule, config in source.rule.items() if config.disable is not vyos_defined %} {{ nat_rule(rule, config, 'POSTROUTING') }} {% endfor %} {% endif %}