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#!/usr/sbin/nft -f
# vim:set ts=4:
# You can find examples in /usr/share/nftables/.
# Clear all prior state
flush ruleset
# Basic IPv4/IPv6 stateful firewall for server/workstation.
table inet filter {
chain input {
type filter hook input priority 0; policy drop;
iifname lo accept \
comment "Accept any localhost traffic"
ct state { established, related } accept \
comment "Accept traffic originated from us"
ct state invalid drop \
comment "Drop invalid connections"
tcp dport 113 reject with icmpx type port-unreachable \
comment "Reject AUTH to make it fail fast"
# ICMPv4
ip protocol icmp icmp type {
echo-reply, # type 0
destination-unreachable, # type 3
time-exceeded, # type 11
parameter-problem, # type 12
} accept \
comment "Accept ICMP"
ip protocol icmp icmp type echo-request limit rate 1/second accept \
comment "Accept max 1 ping per second"
# ICMPv6
ip6 nexthdr icmpv6 icmpv6 type {
destination-unreachable, # type 1
packet-too-big, # type 2
time-exceeded, # type 3
parameter-problem, # type 4
echo-reply, # type 129
} accept \
comment "Accept basic IPv6 functionality"
ip6 nexthdr icmpv6 icmpv6 type echo-request limit rate 1/second accept \
comment "Accept max 1 ping per second"
ip6 nexthdr icmpv6 icmpv6 type {
nd-router-solicit, # type 133
nd-router-advert, # type 134
nd-neighbor-solicit, # type 135
nd-neighbor-advert, # type 136
} ip6 hoplimit 255 accept \
comment "Allow IPv6 SLAAC"
ip6 nexthdr icmpv6 icmpv6 type {
mld-listener-query, # type 130
mld-listener-report, # type 131
mld-listener-reduction, # type 132
mld2-listener-report, # type 143
} ip6 saddr fe80::/10 accept \
comment "Allow IPv6 multicast listener discovery on link-local"
}
chain forward {
type filter hook forward priority 0; policy drop;
}
chain output {
type filter hook output priority 0; policy accept;
}
}
include "/etc/nftables.d/*.nft"
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