nat: T2198: move from iptables to nftables

1 files changed, 43 insertions, 0 deletions

diff --git a/data/templates/firewall/nftables-nat.tmpl b/data/templates/firewall/nftables-nat.tmpl
new file mode 100644
index 000000000..340ab3678
--- /dev/null
+++ b/data/templates/firewall/nftables-nat.tmpl
@@ -0,0 +1,43 @@
+#!/usr/sbin/nft -f

+

+# Start with a "clean" NAT table

+flush table nat

+

+add chain ip raw NAT_CONNTRACK

+add rule ip raw PREROUTING position 25 counter jump VYATTA_CT_HELPER

+add rule ip raw PREROUTING position 17 counter jump NAT_CONNTRACK

+add rule ip raw OUTPUT position 26 counter jump VYATTA_CT_HELPER

+add rule ip raw OUTPUT position 21 counter jump NAT_CONNTRACK

+add rule ip raw NAT_CONNTRACK counter accept

+

+

+{% for r in destination -%}

+{% if r.protocol == 'tcp_udp' %}

+{# Special handling for protocol tcp_udp which is represented as two individual rules #}

+add rule ip nat PREROUTING iifname "{{ r.interface_in }}" tcp dport { {{ r.dest_port }} } counter dnat to {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }} comment "DST-NAT-{{ r.number }} tcp_udp"

+add rule ip nat PREROUTING iifname "{{ r.interface_in }}" udp dport { {{ r.dest_port }} } counter dnat to {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }} comment "DST-NAT-{{ r.number }} tcp_udp"

+{% else %}

+add rule ip nat PREROUTING iifname "{{ r.interface_in }}" {{ r.protocol }} dport { {{ r.dest_port }} } counter dnat to {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }} comment "DST-NAT-{{ r.number }}"

+{% 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 %}