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- #
- # rules.before
- #
- # Rules that should be run before the ufw command line added rules. Custom
- # rules should be added to one of these chains:
- # ufw-before-input
- # ufw-before-output
- # ufw-before-forward
- #
- # Don't delete these required lines, otherwise there will be errors
- *filter
- :ufw-before-input - [0:0]
- :ufw-before-output - [0:0]
- :ufw-before-forward - [0:0]
- :ufw-not-local - [0:0]
- # End required lines
- # allow all on loopback
- -A ufw-before-input -i lo -j ACCEPT
- -A ufw-before-output -o lo -j ACCEPT
- # quickly process packets for which we already have a connection
- -A ufw-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
- -A ufw-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
- # drop INVALID packets (logs these in loglevel medium and higher)
- -A ufw-before-input -m conntrack --ctstate INVALID -j ufw-logging-deny
- -A ufw-before-input -m conntrack --ctstate INVALID -j DROP
- # ok icmp codes
- -A ufw-before-input -p icmp --icmp-type destination-unreachable -j ACCEPT
- -A ufw-before-input -p icmp --icmp-type source-quench -j ACCEPT
- -A ufw-before-input -p icmp --icmp-type time-exceeded -j ACCEPT
- -A ufw-before-input -p icmp --icmp-type parameter-problem -j ACCEPT
- -A ufw-before-input -p icmp --icmp-type echo-request -j ACCEPT
- # allow dhcp client to work
- -A ufw-before-input -p udp --sport 67 --dport 68 -j ACCEPT
- #
- # ufw-not-local
- #
- -A ufw-before-input -j ufw-not-local
- # if LOCAL, RETURN
- -A ufw-not-local -m addrtype --dst-type LOCAL -j RETURN
- # if MULTICAST, RETURN
- -A ufw-not-local -m addrtype --dst-type MULTICAST -j RETURN
- # if BROADCAST, RETURN
- -A ufw-not-local -m addrtype --dst-type BROADCAST -j RETURN
- # all other non-local packets are dropped
- -A ufw-not-local -m limit --limit 3/min --limit-burst 10 -j ufw-logging-deny
- -A ufw-not-local -j DROP
- # allow MULTICAST mDNS for service discovery (be sure the MULTICAST line above
- # is uncommented)
- -A ufw-before-input -p udp -d 224.0.0.251 --dport 5353 -j ACCEPT
- # allow MULTICAST UPnP for service discovery (be sure the MULTICAST line above
- # is uncommented)
- -A ufw-before-input -p udp -d 239.255.255.250 --dport 1900 -j ACCEPT
- # don't delete the 'COMMIT' line or these rules won't be processed
- COMMIT
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