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#!/usr/bin/nft -f
# Laptop firewall: default-deny inbound, allow outbound.
# Scoped to `inet filter` so podman/netavark tables are preserved on reload.
destroy table inet filter
table inet filter {
chain input {
type filter hook input priority filter; policy drop;
iif "lo" accept
ct state vmap { established : accept, related : accept, invalid : drop }
# IPv4 ICMP essentials
ip protocol icmp icmp type {
echo-request,
destination-unreachable,
time-exceeded,
parameter-problem
} accept
# IPv6 ICMP: NDP, PMTUD, echo, MLD
meta l4proto icmpv6 icmpv6 type {
destination-unreachable,
packet-too-big,
time-exceeded,
parameter-problem,
echo-request,
nd-router-solicit,
nd-router-advert,
nd-neighbor-solicit,
nd-neighbor-advert,
mld-listener-query,
mld-listener-report,
mld-listener-done,
mld2-listener-report
} accept
# DHCPv6 client
ip6 saddr fe80::/10 udp dport 546 accept
}
chain forward {
type filter hook forward priority filter; policy drop;
}
chain output {
type filter hook output priority filter; policy accept;
}
}
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