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authorChristian Poessinger <christian@poessinger.com>2021-01-19 21:01:20 +0100
committerChristian Poessinger <christian@poessinger.com>2021-01-19 21:04:28 +0100
commit9207897983a3bfafa0ec3e436c1ad67790f09f06 (patch)
tree48d3291319fc113eda2c0effe866df154d7e8e21 /data/templates/firewall/nftables-nat.tmpl
parent75e947ccc72d1532e1bf9c2f5011060a1043a14e (diff)
downloadvyos-1x-9207897983a3bfafa0ec3e436c1ad67790f09f06.tar.gz
vyos-1x-9207897983a3bfafa0ec3e436c1ad67790f09f06.zip
nat: T2947: add many-many translation
Support a 1:1 or 1:n prefix translation. The following configuration will NAT source addresses from the 10.2.0.0/16 range to an address from 192.0.2.0/29. For this feature to work a Linux Kernel 5.8 or higher is required! vyos@vyos# show nat source { rule 100 { outbound-interface eth1 source { address 10.2.0.0/16 } translation { address 192.0.2.0/29 } } } This results in the nftables configuration: chain POSTROUTING { type nat hook postrouting priority srcnat; policy accept; oifname "eth1" counter packets 0 bytes 0 snat ip prefix to ip saddr map { 10.2.0.0/16 : 192.0.2.0/29 } comment "SRC-NAT-100" }
Diffstat (limited to 'data/templates/firewall/nftables-nat.tmpl')
-rw-r--r--data/templates/firewall/nftables-nat.tmpl31
1 files changed, 23 insertions, 8 deletions
diff --git a/data/templates/firewall/nftables-nat.tmpl b/data/templates/firewall/nftables-nat.tmpl
index 770a24a95..5480447f2 100644
--- a/data/templates/firewall/nftables-nat.tmpl
+++ b/data/templates/firewall/nftables-nat.tmpl
@@ -21,18 +21,34 @@
{% set comment = 'DST-NAT-' + rule %}
{% set base_log = '[NAT-DST-' + rule %}
{% set interface = ' iifname "' + config.inbound_interface + '"' if config.inbound_interface is defined and config.inbound_interface != 'any' else '' %}
-{% set trns_addr = 'dnat to ' + config.translation.address if config.translation is defined and config.translation.address is defined and config.translation.address is not none %}
+{% if config.translation is defined and config.translation.address is defined and config.translation.address is not none %}
+{# support 1:1 network translation #}
+{% if config.translation.address | is_ip_network %}
+{% set trns_addr = 'dnat ip prefix to ip daddr 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 = 'dnat to ' + config.translation.address %}
+{% endif %}
+{% endif %}
{% elif chain == 'POSTROUTING' %}
{% set comment = 'SRC-NAT-' + rule %}
{% set base_log = '[NAT-SRC-' + rule %}
{% set interface = ' oifname "' + config.outbound_interface + '"' if config.outbound_interface is defined and config.outbound_interface != 'any' else '' %}
-{% if config.translation is defined and config.translation.address is defined and config.translation.address == 'masquerade' %}
-{% set trns_addr = config.translation.address %}
-{% if config.translation.port is defined and config.translation.port is not none %}
-{% set trns_addr = trns_addr + ' to ' %}
+{% 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_addr = config.translation.address %}
+{% if config.translation.port is defined and config.translation.port is not none %}
+{% 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 %}
-{% else %}
-{% set trns_addr = 'snat to ' + config.translation.address if config.translation is defined and config.translation.address is defined and config.translation.address is not none %}
{% endif %}
{% endif %}
{% set trns_port = ':' + config.translation.port if config.translation is defined and config.translation.port is defined and config.translation.port is not none %}
@@ -132,7 +148,6 @@ add rule ip raw NAT_CONNTRACK counter accept
{{ nat_rule(rule, config, 'PREROUTING') }}
{% endfor %}
{% endif %}
-
#
# Source NAT rules build up here
#