From a927192af24079e6d392e5cae0340441490c0091 Mon Sep 17 00:00:00 2001
From: Christian Poessinger <christian@poessinger.com>
Date: Fri, 1 May 2020 19:25:36 +0200
Subject: nat: T2198: move from iptables to nftables

---
 data/templates/firewall/nftables-nat.tmpl | 43 +++++++++++++++++++++++++++++++
 data/templates/nat/iptables-restore.tmpl  | 38 ---------------------------
 2 files changed, 43 insertions(+), 38 deletions(-)
 create mode 100644 data/templates/firewall/nftables-nat.tmpl
 delete mode 100644 data/templates/nat/iptables-restore.tmpl

(limited to 'data/templates')

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 %}
diff --git a/data/templates/nat/iptables-restore.tmpl b/data/templates/nat/iptables-restore.tmpl
deleted file mode 100644
index f20a05719..000000000
--- a/data/templates/nat/iptables-restore.tmpl
+++ /dev/null
@@ -1,38 +0,0 @@
-### Autogenerated by nat.py ###
-
-*nat
-:PREROUTING ACCEPT [0:0]
-:INPUT ACCEPT [0:0]
-:OUTPUT ACCEPT [0:0]
-:POSTROUTING ACCEPT [0:0]
-:VYATTA_PRE_DNAT_HOOK - [0:0]
-:VYATTA_PRE_SNAT_HOOK - [0:0]
--A PREROUTING -j VYATTA_PRE_DNAT_HOOK
-{% for r in destination -%}
-{% if (',' in r.dest_port) or ('-' in r.dest_port) %}
-
-{% if r.protocol == 'tcp_udp' %}
-# protocol has been tcp_udp - create two distinct rules
--A PREROUTING -i {{ r.interface_in }} -p tcp -m multiport --dports {{ r.dest_port | replace('-', ':') }} -m comment --comment "DST-NAT-{{ r.number }} tcp_udp" -j DNAT --to-destination {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }}
--A PREROUTING -i {{ r.interface_in }} -p udp -m multiport --dports {{ r.dest_port | replace('-', ':') }} -m comment --comment "DST-NAT-{{ r.number }} tcp_udp" -j DNAT --to-destination {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }}
-{% else %}
--A PREROUTING -i {{ r.interface_in }} -p {{ r.protocol }} -m multiport --dports {{ r.dest_port | replace('-', ':') }} -m comment --comment DST-NAT-{{ r.number }} -j DNAT --to-destination {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }}
-{%- endif %}
-
-{% else %}
-
-{% if r.protocol == 'tcp_udp' %}
-# protocol has been tcp_udp - create two distinct rules
--A PREROUTING -i {{ r.interface_in }} -p tcp -m {{ r.protocol }} --dports {{ r.dest_port }} -m comment --comment "DST-NAT-{{ r.number }} tcp_udp" -j DNAT --to-destination {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }}
--A PREROUTING -i {{ r.interface_in }} -p udp -m {{ r.protocol }} --dports {{ r.dest_port }} -m comment --comment "DST-NAT-{{ r.number }} tcp_udp" -j DNAT --to-destination {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }}
-{% else %}
--A PREROUTING -i {{ r.interface_in }} -p {{ r.protocol }} -m {{ r.protocol }} --dport {{ r.dest_port }} -m comment --comment DST-NAT-{{ r.number }} -j DNAT --to-destination {{ r.translation_address }}{{ ":" + r.translation_port if r.translation_port }}
-{% endif %}
-
-{%- endif %}
-
-{% endfor %}
--A POSTROUTING -j VYATTA_PRE_SNAT_HOOK
--A VYATTA_PRE_DNAT_HOOK -j RETURN
--A VYATTA_PRE_SNAT_HOOK -j RETURN
-COMMIT
-- 
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