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When pfctl(8) encounters a list during loading of the ruleset, it creates multiple rules, one for each item in the list. For example:
block out on fxp0 from { 192.168.0.1, 10.5.32.6 } to any
gets expanded to:
block out on fxp0 from 192.168.0.1 to any
block out on fxp0 from 10.5.32.6 to any
Multiple lists can be specified within a rule and are not limited to just filter rules:
rdr on fxp0 proto tcp from any to any port { 22 80 } -> \
192.168.0.6
block out on fxp0 proto { tcp udp } from { 192.168.0.1, \
10.5.32.6 } to any port { ssh telnet }
Note that the commas between list items are optional.
Macro names must start with a letter and may contain letters, digits, and underscores. Macro names cannot be reserved words such as pass, out, or queue.
ext_if = "fxp0"
block in on $ext_if from any to any
This creates a macro named ext_if. When a macro is referred to after it's been created, its name is preceded with a $ character.
Macros can also expand to lists, such as:
friends = "{ 192.168.1.1, 10.0.2.5, 192.168.43.53 }"
Macros can be defined recursively. Since macros are not expanded within quotes the following syntax must be used:
host1 = "192.168.1.1"
host2 = "192.168.1.2"
all_hosts = "{" $host1 $host2 "}"
The macro $all_hosts now expands to 192.168.1.1, 192.168.1.2.
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