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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: # ufw6-before-input # ufw6-before-output # ufw6-before-forward # # Don't delete these required lines, otherwise there will be errors *filter :ufw6-before-input - [0:0] :ufw6-before-output - [0:0] :ufw6-before-forward - [0:0] # End required lines # allow all on loopback -A ufw6-before-input -i lo -j ACCEPT -A ufw6-before-output -o lo -j ACCEPT # drop packets with RH0 headers -A ufw6-before-input -m rt --rt-type 0 -j DROP -A ufw6-before-forward -m rt --rt-type 0 -j DROP -A ufw6-before-output -m rt --rt-type 0 -j DROP # for stateless autoconfiguration (restrict NDP messages to hop limit of 255) -A ufw6-before-input -p icmpv6 --icmpv6-type neighbor-solicitation -m hl --hl-eq 255 -j ACCEPT -A ufw6-before-output -p icmpv6 --icmpv6-type neighbor-solicitation -m hl --hl-eq 255 -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type neighbor-advertisement -m hl --hl-eq 255 -j ACCEPT -A ufw6-before-output -p icmpv6 --icmpv6-type neighbor-advertisement -m hl --hl-eq 255 -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type router-solicitation -m hl --hl-eq 255 -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type router-advertisement -m hl --hl-eq 255 -j ACCEPT # quickly process packets for which we already have a connection -A ufw6-before-input -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -A ufw6-before-output -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -A ufw6-before-forward -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT # for multicast ping replies from link-local addresses (these don't have an # associated connection and would otherwise be marked INVALID) -A ufw6-before-input -p icmpv6 --icmpv6-type echo-reply -s fe80::/10 -j ACCEPT # drop INVALID packets (logs these in loglevel medium and higher) -A ufw6-before-input -m conntrack --ctstate INVALID -j ufw6-logging-deny -A ufw6-before-input -m conntrack --ctstate INVALID -j DROP # ok icmp codes for INPUT -A ufw6-before-input -p icmpv6 --icmpv6-type destination-unreachable -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type packet-too-big -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type parameter-problem -j ACCEPT -A ufw6-before-input -p icmpv6 --icmpv6-type echo-request -j ACCEPT # ok icmp code for FORWARD -A ufw6-before-forward -p icmpv6 --icmpv6-type destination-unreachable -j ACCEPT -A ufw6-before-forward -p icmpv6 --icmpv6-type packet-too-big -j ACCEPT -A ufw6-before-forward -p icmpv6 --icmpv6-type time-exceeded -j ACCEPT -A ufw6-before-forward -p icmpv6 --icmpv6-type parameter-problem -j ACCEPT -A ufw6-before-forward -p icmpv6 --icmpv6-type echo-request -j ACCEPT # allow dhcp client to work -A ufw6-before-input -p udp -s fe80::/10 --sport 547 -d fe80::/10 --dport 546 -j ACCEPT # allow MULTICAST mDNS for service discovery -A ufw6-before-input -p udp -d ff02::fb --dport 5353 -j ACCEPT # allow MULTICAST UPnP for service discovery -A ufw6-before-input -p udp -d ff02::f --dport 1900 -j ACCEPT # don't delete the 'COMMIT' line or these rules won't be processed COMMIT