machine_setup/ansible/roles/firewall/files/odofreebsd_pf.conf

ext_if = "{ igb0 igb1 ix0 ix1 wlan0 }"
jail_net_v4 = "10.193.223.0/24"

dhcp = "{ bootpc, bootps }"
# allow = "{ nat_uplink0 }"

tcp_pass_in = "{ 22 }"
udp_pass_in = "{ 53 51820 }"

# Rules must be in order: options, normalization, queueing, translation, filtering

# options
set skip on lo

# redirections
nat on $ext_if inet from $jail_net_v4 to { any, !$jail_net_v4 } tag ALLOWED -> (wlan0)

rdr on nat_uplink0 inet proto {tcp, udp} from any to 10.193.223.1 port 53 tag ALLOWED -> 1.1.1.1 port 53

# filtering
block log all
pass quick on $ext_if tagged ALLOWED
pass out on $ext_if

# We pass on the interfaces listed in allow rather than skipping on
# them because changes to pass rules will update when running a
# `service pf reload` but interfaces that we `skip` will not update (I
# forget if its from adding, removing, or both. TODO: test to figure
# it out)
# pass quick on $allow

pass on $ext_if proto icmp all
pass on $ext_if proto icmp6 all

pass in on $ext_if proto tcp to any port $tcp_pass_in
pass in on $ext_if proto udp to any port $udp_pass_in

pass quick on $ext_if proto udp from any port $dhcp to any port $dhcp

pass in on nat_uplink0 proto udp from any to any port { 53 51820 }