homemade_firewall/filter.nft

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#!/usr/bin/nft
flush ruleset
include "./defines.nft"
table ip filter {
set allowed_tcp_ports {
type inet_service;
flags constant;
elements = { $SSH_PORT1, $SSH_PORT2, $DNS_PORT, $HTTP_PORT, $HTTPS_PORT, $SYNCPLAY_PORT, $TERRARIA_PORT, $OPENTTD_PORT, $MAINPAGE_PORT, $NEXTCLOUD_PORT, $GITEA_PORT };
}
set allowed_udp_ports_in {
type inet_service;
flags constant;
elements = { $DNS_PORT, $DHCP_IN_PORT, $OPENVPN_PORT, $FACTORIO_PORT, $OPENTTD_PORT, $CSTRIKE_PORT }
}
set allowed_udp_ports_out {
type inet_service;
flags constant;
elements = { $DNS_PORT, $DHCP_OUT_PORT }
}
chain in {
type filter hook input priority filter; policy drop;
ct state vmap { invalid : drop, related : accept, established : accept };
iifname "lo" accept;
tcp dport @allowed_tcp_ports accept;
udp dport @allowed_udp_ports_in accept;
}
chain forward {
type filter hook forward priority filter; policy drop;
comment "this routes vpn traffic";
ct state related,established accept;
iifname "tun0" oifname "eth0" accept;
}
chain out {
type filter hook output priority filter; policy drop;
udp dport @allowed_udp_ports_out accept;
oifname "lo" accept;
}
}
include "./nat.nft"