Archived
118 lines
4.1 KiB
Plaintext
118 lines
4.1 KiB
Plaintext
#!/usr/sbin/nft -f
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# This configuration file is customized by fox,
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# Optimize nftables rules for local TS server.
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table inet router
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flush table inet router
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table inet router {
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#
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# Flowtable
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#
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flowtable ft {
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hook ingress priority filter;
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devices = { eth0 };
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counter;
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}
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#
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# Filter rules
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#
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chain input {
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type filter hook input priority filter; policy drop;
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iif "lo" accept comment "defconf: accept traffic from loopback"
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ct state established,related accept comment "defconf: handle inbound flows"
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tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "defconf: rate limit new TCP connections"
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iifname "eth0" accept comment "defconf: accept LAN IPv4 / IPv6 input traffic"
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iifname "tailscale0" goto accept_from_tailscale comment "tsconf: handle TS IPv4 / IPv6 input traffic"
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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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ct state established,related flow add @ft accept comment "defconf: offload and accept forwarded flows"
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iifname "eth0" goto forward_lan comment "defconf: handle LAN IPv4 / IPv6 forward traffic"
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iifname "tailscale0" goto forward_tailscale comment "tsconf: handle TS IPv4 / IPv6 forward traffic"
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}
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chain output {
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type filter hook output priority filter; policy accept;
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oif "lo" accept comment "defconf: accept traffic towards loopback"
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ct state established,related accept comment "defconf: handle outbound flows"
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oifname "eth0" goto accept_to_lan comment "defconf: handle LAN IPv4 / IPv6 output traffic"
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oifname "tailscale0" goto accept_to_tailscale comment "tsconf: handle TS IPv4 / IPv6 output traffic"
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}
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chain syn_flood {
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limit rate 50/second burst 100 packets return comment "defconf: accept new TCP connections below rate-limit"
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counter drop comment "defconf: drop excess new TCP connections"
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}
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chain forward_lan {
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oifname "tailscale0" goto accept_to_tailscale comment "tsconf: accept LAN to TS forwarding"
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ct status dnat accept comment "lanconf: accept port forwards"
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oifname "eth0" goto accept_to_lan
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}
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chain forward_tailscale {
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oifname "eth0" goto accept_to_lan comment "tsconf: accept TS to LAN forwarding"
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oifname "tailscale0" goto accept_to_tailscale
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}
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chain accept_to_lan {
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meta nfproto ipv4 ct state invalid counter drop comment "defconf: prevent LAN NATv4 leakage"
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accept comment "defconf: accept LAN IPv4 / IPv6 traffic"
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}
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chain accept_from_tailscale {
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meta nfproto ipv4 counter accept comment "tsconf: accept TS IPv4 traffic"
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meta nfproto ipv6 counter accept comment "tsconf: accept TS IPv6 traffic"
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}
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chain accept_to_tailscale {
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meta nfproto ipv4 counter accept comment "tsconf: accept TS IPv4 traffic"
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meta nfproto ipv6 counter accept comment "tsconf: accept TS IPv6 traffic"
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}
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#
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# NAT rules
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#
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chain dstnat {
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type nat hook prerouting priority dstnat; policy accept;
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iifname { "eth0", "tailscale0" } meta l4proto { tcp, udp } th dport domain goto redirect_dns comment "defconf: handle LAN IPv4 / IPv6 dstnat traffic"
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}
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chain srcnat {
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type nat hook postrouting priority srcnat; policy accept;
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oifname "eth0" meta nfproto ipv4 counter masquerade comment "defconf: masquerade LAN IPv4 traffic"
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}
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chain redirect_dns {
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meta nfproto ipv4 counter redirect comment "lanconf: LAN IPv4 DNS redirect"
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meta nfproto ipv6 counter redirect comment "lanconf: LAN IPv6 DNS redirect"
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}
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#
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# Mangle rules
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#
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chain mangle_postrouting {
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type filter hook postrouting priority mangle; policy accept;
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oifname "eth0" tcp flags & (fin | syn | rst) == syn tcp option maxseg size set rt mtu comment "defconf: zone LAN IPv4 / IPv6 egress MTU fixing"
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}
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chain mangle_forward {
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type filter hook forward priority mangle; policy accept;
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iifname "eth0" tcp flags & (fin | syn | rst) == syn tcp option maxseg size set rt mtu comment "defconf: zone LAN IPv4 / IPv6 ingress MTU fixing"
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}
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}
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