129 lines
4.1 KiB
Plaintext
129 lines
4.1 KiB
Plaintext
define NAT_LAN_IFACES = { "br-lan", "br-guest" }
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define PHYSICAL_WAN = "enp1s0"
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define NAT_WAN_IFACES = { $PHYSICAL_WAN }
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table inet filter {
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# These two sets are dynamically managed by dnsmasq
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set iot_ntp4 {
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type ipv4_addr
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comment "IPv4 addresses of resolved NTP servers"
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}
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set iot_ntp6 {
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type ipv6_addr
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comment "IPv6 addresses of resolved NTP servers"
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}
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chain forward {
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type filter hook forward priority filter; policy drop
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# plastic router, might be vulnerable (FIXME v6 is still reachable)
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iifname "br-guest" ip daddr "192.168.0.1" drop
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# allow traffic between selected VLANs and wan
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iifname $NAT_LAN_IFACES oifname $NAT_WAN_IFACES counter accept
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iifname $NAT_WAN_IFACES oifname $NAT_LAN_IFACES ct state established,related counter accept
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# traffic from lan to all other vlans is allowed
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iifname "br-lan" oifname $VLAN_BRIDGES counter accept;
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iifname $VLAN_BRIDGES oifname "br-lan" ct state established,related counter accept
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iifname "br-iot" ip daddr @iot_ntp4 udp dport 123 counter accept
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iifname "br-iot" ip6 daddr @iot_ntp6 udp dport 123 counter accept
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iifname $NAT_WAN_IFACES oifname "br-iot" ct state established,related counter accept
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}
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}
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table inet nat {
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chain postrouting {
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type nat hook postrouting priority filter; policy accept
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oifname $NAT_WAN_IFACES masquerade
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}
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}
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# Only allow select connections from and to (physical) wan,
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# overriding NixOS firewall in some cases.
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table inet restrict-wan {
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# Priorities must be higher than filter (0),
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# which the NixOS firewall uses.
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chain input {
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type filter hook input priority -50; policy accept
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# accept responses
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iifname $PHYSICAL_WAN ct state established,related counter accept
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# accept icmpv6
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iifname $PHYSICAL_WAN icmpv6 type { nd-neighbor-solicit, nd-router-advert, nd-neighbor-advert } accept
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# drop everything else
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iifname $PHYSICAL_WAN counter drop
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}
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# This handles all packets (local and forwarded)
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chain postrouting {
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type filter hook postrouting priority 0; policy accept
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# accept connections over physical wan
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oifname $PHYSICAL_WAN counter accept
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}
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}
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# Traffic control
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# Neets output and prerouting to match packets from localhost and lan
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table inet tc {
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chain output {
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type route hook output priority mangle
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# hardcoded, but unlikely to change
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ip daddr { "9.9.9.9", "149.112.112.112" } meta priority set 1:3 counter return comment "DNS (4)"
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ip6 daddr { "2620:fe::9", "2620:fe::fe" } meta priority set 1:3 counter return comment "DNS (6)"
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jump common
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}
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chain forward {
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type filter hook forward priority mangle
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jump common
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}
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chain common {
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iifname "br-guest" meta priority set 1:a counter return comment "guest network"
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meta l4proto tcp meta length 1-64 meta priority set 1:3 counter return comment "small tcp packets"
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tcp dport 22 ip dscp af21 meta priority set 1:4 counter return comment "interactive SSH (4)"
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tcp dport 22 ip6 dscp af21 meta priority set 1:4 counter return comment "interactive SSH (6)"
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meta l4proto udp ip dscp af13 meta priority set 1:5 ip dscp set cs0 counter return comment "fuuko torrent"
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ip daddr 168.119.176.53 tcp dport 443 ip dscp af12 meta priority set 1:9 counter return comment "restic (4)"
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ip6 daddr 2a01:4f8:c012:2f4::1 tcp dport 443 ip6 dscp af12 meta priority set 1:9 counter return comment "restic (6)"
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meta l4proto { tcp, udp } th dport 443 meta priority set 1:6 counter return comment "HTTPS"
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ip daddr 168.119.176.53 udp dport 51820 meta priority set 1:7 counter return comment "wg-home"
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meta l4proto { tcp, udp } ip dscp ef meta priority set 1:8 counter return comment "VoIP (4)"
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meta l4proto { tcp, udp } ip6 dscp ef meta priority set 1:8 counter return comment "VoIP (6)"
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meta l4proto { tcp, udp } th dport 64738 meta priority set 1:8 counter return comment "Mumble"
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}
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}
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# Tracing infrastructure, can be used for debugging (nft monitor trace)
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table inet trace {
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chain prerouting {
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type filter hook prerouting priority raw - 1
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jump common
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}
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chain output {
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type filter hook output priority raw - 1
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jump common
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}
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chain common {
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# Add tracing rule here
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# … meta nftrace set 1
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# DO NOT COMMIT ANY TRACING RULES
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}
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}
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