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firewall: T4612: Support arbitrary netmasks Documentation #885

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firewall: T4612: Support arbitrary netmasks Documentation #885

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31 changes: 31 additions & 0 deletions docs/configuration/firewall/general.rst
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Expand Up @@ -323,6 +323,37 @@ There are a lot of matching criteria against which the package can be tested.
set firewall name WAN-IN-v4 rule 101 source address !203.0.113.0/24
set firewall ipv6-name WAN-IN-v6 rule 100 source address 2001:db8::202

.. cfgcmd:: set firewall name <name> rule <1-999999> source address-mask
[address]
.. cfgcmd:: set firewall name <name> rule <1-999999> destination address-mask
[address]
.. cfgcmd:: set firewall ipv6-name <name> rule <1-999999> source address-mask
[address]
.. cfgcmd:: set firewall ipv6-name <name> rule <1-999999> destination
address-mask [address]

An arbitrary netmask can be applied to mask addresses to only match against
a specific portion. This is particularly useful with IPv6 and a zone-based
firewall as rules will remain valid if the IPv6 prefix changes and the host
portion of systems IPv6 address is static (for example, with SLAAC or `tokenised IPv6 addresses
<https://datatracker.ietf.org/doc/id/draft-chown-6man-tokenised-ipv6-identifiers-02.txt>`_)

This functions for both individual addresses and address groups.

.. code-block:: none

# Match any IPv6 address with the suffix ::0000:0000:0000:beef
set firewall ipv6-name WAN-LAN-v6 rule 100 destination address ::beef
set firewall ipv6-name WAN-LAN-v6 rule 100 destination address-mask ::ffff:ffff:ffff:ffff
# Match any IPv4 address with `11` as the 2nd octet and `13` as the forth octet
set firewall name WAN-LAN-v4 rule 100 destination address 0.11.0.13
set firewall name WAN-LAN-v4 rule 100 destination address-mask 0.255.0.255
# Address groups
set firewall group ipv6-address-group WEBSERVERS address ::1000
set firewall group ipv6-address-group WEBSERVERS address ::2000
set firewall name WAN-LAN-v6 rule 200 source group address-group WEBSERVERS
set firewall name WAN-LAN-v6 rule 200 source address-mask ::ffff:ffff:ffff:ffff

.. cfgcmd:: set firewall name <name> rule <1-999999> source geoip country-code
<country>
.. cfgcmd:: set firewall name <name> rule <1-999999> source geoip inverse-match
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