# $OpenBSD: pf.conf,v 1.28 2004/04/29 21:03:09 frantzen Exp $
#
# See pf.conf(5) and /usr/share/pf for syntax and examples.
# Remember to set net.inet.ip.forwarding=1 and/or net.inet6.ip6.forwarding=1
# in /etc/sysctl.conf if packets are to be forwarded between interfaces.
# macros
int_if = "sis0"
ext_if = "xl0"
tcp_services = "{ 22, 113 }"
icmp_types = "echoreq"
rdr_outgoing = " 21 "
main_comp = " 172.30.20.2 "
main_services = "{ 555, 80 }"
priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"
# options
set block-policy return
set loginterface $ext_if
# scrub
scrub in all
# nat/rdr
nat on $ext_if from $int_if:network to any -> ($ext_if)
rdr on $int_if proto tcp from any to any port $rdr_outgoing -> 127.0.0.1 port 8021
rdr on $ext_if proto tcp from any to any port $main_services -> $main_comp
# filter rules
block all
pass quick on lo0 all
block drop in quick on $ext_if from $priv_nets to any
block drop out quick on $ext_if from any to $priv_nets
pass in on $ext_if inet proto tcp from any to ($ext_if) port $tcp_services flags S/SA keep state
pass in on $ext_if proto tcp from any to $main_comp port $main_services flags S/SA synproxy state
pass in on $ext_if inet proto tcp from port 20 to ($ext_if) user proxy flags S/SA keep state
pass in inet proto icmp all icmp-type $icmp_types keep state
pass in on $int_if from $int_if:network to any keep state
pass out on $int_if from any to $int_if:network keep state
pass out on $ext_if proto tcp all modulate state flags S/SA
pass out on $ext_if proto { udp, icmp } all keep state