BSD PF IPv6 and IPv4 /etc/pf.conf Firewall Script

#### S0.1 First declare a couple of variables ####
# Created by Vivek Gite <vivek@nixcraft.com>
# See more info @
# http://bash.cyberciti.biz/firewall/pf-ipv6-ipv4-firewall-for-freebsd-openbsd-netbsd/
tcp_services = "{ ssh, smtp, domain, www, https, 122, ntp, 43}"
udp_services = "{ domain, ntp }"
icmp_types = "{ echoreq, unreach }"
mail_ports = "{ smtp, imaps }"
 
### define tables
table <droplasso> persist file "/etc/pf.drop.lasso.conf"
table <blockedip> persist file "/etc/pf.block.ip.conf"
 
### IPv4 ranges
martians = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8, 169.254.0.0/16, 192.0.2.0/24, 0.0.0.0/8, 240.0.0.0/4, 255.255.255.255/32 }"
http_servers = "{ 208.xx.yyy.zzz }"
mail_servers = "{ 208.xx.yyy.zzz}"
dns_servers = "{ 208.xx.yyy.zzz }"
 
adminrange = "66.228.118.0/23"
 
### ipv6 ranges 
adminrange6 = "{ 2607:F0D0:2000:0000::/48 }"
http_servers6 = "{ 260z:xxx.. }"
mail_servers6 = "{ 260z:xxx.. }"
dns_servers6 = "{ 260z:xxx.. }"
 
IPV6LAN = "{ 260z:xxx../64 }"
IPV6MAIN = "{ 260z:xxx.. }"
 
### Interfaces 
ext_if = "em1"
int_if = "em0"
 
## S0.2: Options
set block-policy return
set loginterface $ext_if
 
#### S0.3: Normliaztion
#scrub provides a measure of protection against certain kinds of attacks based on incorrect handling of packet fragments
scrub in all 
 
#### S0.4: NAT and RDR start
 
# Drop ALL incomming everything 
block log all 
 
# Try to block nmap scans
block in log quick on $ext_if inet proto tcp from any to any flags FUP/FUP
 
#IPv6 - pass in/out all IPv6 ICMP traffic
pass in quick proto icmp6 all
 
# unlimited traffic for vpn and loopback 
set skip on {lo0, $int_if}
 
# activate spoofing protection for all interfaces
block in quick from urpf-failed
#antispoof is a common special case of filtering and blocking. This mechanism protects against activity from spoofed or forged IP addresses
antispoof log for $ext_if
 
#Block RFC 1918 addresses
block drop in log (all)  quick on $ext_if from $martians to any
block drop out log (all) quick on $ext_if from any to $martians
 
#Block DROP LASSO
#block log (all) all
# pfctl -t droplasso -T show
block drop in log (all)  quick on $ext_if from <droplasso> to any
block drop out log (all) quick on $ext_if from any to <droplasso>
 
# pfctl -t blockedip -T show
block drop in log (all)  quick on $ext_if from <blockedip> to any
block drop out log (all) quick on $ext_if from any to <blockedip>
 
# allow outgoing via ssh, smtp, domain, www, https, 122
pass out on $ext_if proto tcp to any port $tcp_services
pass out on $ext_if proto udp to any port $udp_services
 
# trace route
pass out on $ext_if inet proto udp from any to any port 33433 >< 33626 keep state
 
# SL admin allow 66.228.118.0/255.255.254.0 (23)
pass in on $int_if from $adminrange to any
 
# pass in  on $ext_if proto tcp from any to any port 25
pass in on $ext_if inet proto tcp from 72.xx.yyy.zzz to 208.xx.yyy.zzz port ssh flags S/SA synproxy state
pass in on $ext_if inet proto udp from any to $dns_servers  port domain
pass in on $ext_if inet proto tcp from any to $dns_servers  port domain flags S/SA synproxy state
pass in on $ext_if inet proto tcp from any to $http_servers port http flags S/SA synproxy state
pass in on $ext_if inet proto tcp from any to 208.43.79.236 port https flags S/SA synproxy state
pass in on $ext_if inet proto tcp from any to $mail_servers port $mail_ports flags S/SA synproxy state
 
# ping pong 
pass inet proto icmp all icmp-type $icmp_types keep state
 
# Outgoing ftp
pass out on $ext_if inet proto tcp from any to any port ftp
pass out on $ext_if inet proto tcp from any to any port >1023
 
###### IPv6 rules #############
# Allow outgoing services
pass out on $ext_if inet6 proto tcp to any port $tcp_services
pass out on $ext_if inet6 proto udp to any port $udp_services
 
# Trace route out
pass out on $ext_if inet6 proto udp from any to any port 33433 >< 33626 keep state
 
# SL Admin in
pass in on $ext_if inet6 from $adminrange6 to any
 
# Open ports out
pass in on $ext_if inet6 proto udp from any to $dns_servers6 port domain
pass in on $ext_if inet6 proto tcp from any to $dns_servers6 port domain keep state
pass in on $ext_if inet6 proto tcp from any to $http_servers6 port http keep state
pass in on $ext_if inet6 proto tcp from any to $mail_servers6 port $mail_ports keep state
 
# Ftp out 
pass out on $ext_if inet6 proto tcp from any to any port ftp
pass out on $ext_if inet6 proto tcp from any to any port >1023                                                                      
 
# Allow ping pong out
pass out on $ext_if inet6 proto icmp6 all icmp6-type echoreq keep state
 
# ND solicitation out
pass out on $ext_if inet6 proto icmp6 all icmp6-type {neighbradv, neighbrsol}
 
# ND advertisement in
pass in on $ext_if inet6 proto icmp6 all icmp6-type {neighbradv, neighbrsol}
 
# Router advertisement out
pass out on $ext_if inet6 proto icmp6 all icmp6-type routeradv 
 
# Router solicitation in
pass in on $ext_if inet6 proto icmp6 all icmp6-type routersol
 
# Allow Ping pong in
pass in on $ext_if inet6 proto icmp6 all icmp6-type echoreq