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Diffstat (limited to 'data/templates/firewall/nftables-nat.j2')
| -rw-r--r-- | data/templates/firewall/nftables-nat.j2 | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/data/templates/firewall/nftables-nat.j2 b/data/templates/firewall/nftables-nat.j2 new file mode 100644 index 000000000..1481e9104 --- /dev/null +++ b/data/templates/firewall/nftables-nat.j2 @@ -0,0 +1,182 @@ +#!/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 %} |