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By using a Jinja2 macro the same template code can be used to create both
source and destination NAT rules with only minor changes introduced by
e.g. the used chain (POSTROUTING vs PREROUTING).
Used the following configuration for testing on two systems with VyOS 1.2
and the old implementation vs the new one here.
set nat destination rule 15 description 'foo-10'
set nat destination rule 15 destination address '1.1.1.1'
set nat destination rule 15 inbound-interface 'eth0.202'
set nat destination rule 15 protocol 'tcp_udp'
set nat destination rule 15 translation address '192.0.2.10'
set nat destination rule 15 translation port '3389'
set nat destination rule 20 description 'foo-20'
set nat destination rule 20 destination address '2.2.2.2'
set nat destination rule 20 destination port '22'
set nat destination rule 20 inbound-interface 'eth0.201'
set nat destination rule 20 protocol 'tcp'
set nat destination rule 20 translation address '192.0.2.10'
set nat source rule 100 outbound-interface 'eth0.202'
set nat source rule 100 protocol 'all'
set nat source rule 100 source address '192.0.2.0/26'
set nat source rule 100 translation address 'masquerade'
set nat source rule 110 outbound-interface 'eth0.202'
set nat source rule 110 protocol 'tcp'
set nat source rule 110 source address '192.0.2.0/26'
set nat source rule 110 source port '5556'
set nat source rule 110 translation address 'masquerade'
set nat source rule 120 outbound-interface 'eth0.202'
set nat source rule 120 protocol 'tcp_udp'
set nat source rule 120 source address '192.0.3.0/26'
set nat source rule 120 translation address '2.2.2.2'
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Build up only one output rule string by appending the configuration part by
part.
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CLI commands used for ruleset generation:
set nat source rule 100 outbound-interface 'eth0.202'
set nat source rule 100 protocol 'all'
set nat source rule 100 source address '192.0.2.0/26'
set nat source rule 100 translation address 'masquerade'
set nat source rule 110 outbound-interface 'eth0.202'
set nat source rule 110 protocol 'tcp'
set nat source rule 110 source address '192.0.2.0/26'
set nat source rule 110 source port '5556'
set nat source rule 110 translation address 'masquerade'
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The generated NAT rules in VyOS 1.2 are compared to the generated nftables
ruleset in VyOS 1.3 this was done by converting the 1.2 iptables ruleset to
nftables and then do the diff. To convert from iptables to nftables use the
following command:
$ iptables-save -t nat > /tmp/tmp.iptables
$ iptables-restore-translate -f /tmp/tmp.iptables
The following CLI options have been used for testing:
set nat source rule 10 description 'foo-10'
set nat source rule 10 destination address '1.1.1.1'
set nat source rule 10 destination port '1111'
set nat source rule 10 exclude
set nat source rule 10 log 'enable'
set nat source rule 10 outbound-interface 'eth0.202'
set nat source rule 10 protocol 'tcp_udp'
set nat source rule 10 translation address '192.0.2.10'
set nat source rule 15 description 'foo-10'
set nat source rule 15 destination address '1.1.1.1'
set nat source rule 15 exclude
set nat source rule 15 log 'enable'
set nat source rule 15 outbound-interface 'eth0.202'
set nat source rule 15 protocol 'tcp_udp'
set nat source rule 15 translation address '192.0.2.10'
set nat source rule 20 description 'foo-20'
set nat source rule 20 destination address '2.2.2.2'
set nat source rule 20 log 'enable'
set nat source rule 20 outbound-interface 'eth0.201'
set nat source rule 20 protocol 'tcp'
set nat source rule 20 translation address '192.0.2.10'
set nat source rule 100 outbound-interface 'eth0.202'
set nat source rule 100 protocol 'all'
set nat source rule 100 source address '192.0.2.0/26'
set nat source rule 100 translation address 'masquerade'
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The generated NAT rules in VyOS 1.2 are compared to the generated nftables
ruleset in VyOS 1.3 this was done by converting the 1.2 iptables ruleset to
nftables and then do the diff. To convert from iptables to nftables use the
following command:
$ iptables-save -t nat > /tmp/tmp.iptables
$ iptables-restore-translate -f /tmp/tmp.iptables
The following CLI options have been used for testing:
set nat destination rule 10 description 'foo-10'
set nat destination rule 10 destination address '1.1.1.1'
set nat destination rule 10 destination port '1111'
set nat destination rule 10 exclude
set nat destination rule 10 inbound-interface 'eth0.202'
set nat destination rule 10 log
set nat destination rule 10 protocol 'tcp_udp'
set nat destination rule 10 translation address '192.0.2.10'
set nat destination rule 15 description 'foo-10'
set nat destination rule 15 destination address '1.1.1.1'
set nat destination rule 15 exclude
set nat destination rule 15 inbound-interface 'eth0.202'
set nat destination rule 15 log
set nat destination rule 15 protocol 'tcp_udp'
set nat destination rule 15 translation address '192.0.2.10'
set nat destination rule 20 description 'foo-20'
set nat destination rule 20 destination address '2.2.2.2'
set nat destination rule 20 inbound-interface 'eth0.201'
set nat destination rule 20 log
set nat destination rule 20 protocol 'tcp'
set nat destination rule 20 translation address '192.0.2.10'
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Make the entire template more maintainable
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When instantiating NAT it is required to isntall some nftable jump targets.
The targets need to be added after a specific other target thus we need to
dynamically query the handler number. This is done by get_handler() which could
be moved to vyos.util at a later point in time so it can be reused for a
firewall rewrite.
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