#
# This file is used by /etc/init.d/setfilter
#
# Rules that should be stored in raw table.
# These are mainly used to filter evil or wrong packets.


*raw
:LOG_ICMP - [0:0]
:LOG_SPOOF - [0:0]

## LOG and DROP fragmented packets (not head fragments)
-A PREROUTING --fragment -j LOG --log-prefix "[UFW BLOCK FRAGMENTED]: " --log-level err -m limit --limit 3/min --limit-burst 10
-A PREROUTING --fragment -j DROP

## LOG and DROP strange icmp packets
-A LOG_ICMP -j LOG --log-prefix "[UFW BLOCK BAD-ICMP]: " --log-level err -m limit --limit 3/min --limit-burst 10
-A LOG_ICMP -j DROP
# Too large icmp requests
-A PREROUTING -p icmp --icmp-type echo-request -m length --length 128: -j LOG_ICMP
# Too many times of icmp requests (only 5 packets per second if over 10pkts/sec)
-A PREROUTING -p icmp --icmp-type echo-request -m limit --limit 5/s --limit-burst 10 -j ACCEPT
-A PREROUTING -p icmp --icmp-type echo-request -j LOG_ICMP

## LOG and DROP IP spoofing (eth1:WAN)
-A LOG_SPOOF -j LOG --log-prefix "[UFW BLOCK IP-SPOOFING]: " --log-level err -m limit --limit 3/min --limit-burst 10
-A LOG_SPOOF -j DROP
-A PREROUTING -i eth1 -s    127.0.0.0/8 -j LOG_SPOOF
-A PREROUTING -i eth1 -s     10.0.0.0/8 -j LOG_SPOOF
-A PREROUTING -i eth1 -s  172.16.0.0/12 -j LOG_SPOOF
-A PREROUTING -i eth1 -s 192.168.0.0/16 -j LOG_SPOOF

COMMIT