define icmp_protos = { ipv6-icmp, icmp, igmp } table arp filter { limit lim_arp_local { rate over 50 mbytes/second burst 50 mbytes } limit lim_arp_dsl { rate over 1400 kbytes/second burst 1400 kbytes } counter arp-rx {} counter arp-tx {} counter arp-ratelimit-dsl-rx {} counter arp-ratelimit-dsl-tx {} counter arp-ratelimit-local-rx {} counter arp-ratelimit-local-tx {} chain input { type filter hook input priority filter policy accept iifname != dsl limit name lim_arp_local counter name arp-ratelimit-local-rx drop iifname dsl limit name lim_arp_dsl counter name arp-ratelimit-dsl-rx drop counter name arp-rx } chain output { type filter hook output priority filter policy accept oifname != dsl limit name lim_arp_local counter name arp-ratelimit-local-tx drop oifname dsl limit name lim_arp_dsl counter name arp-ratelimit-dsl-tx drop counter name arp-tx } } table inet filter { limit lim_reject { rate over 1000/second burst 1000 packets } limit lim_icmp_local { rate over 50 mbytes/second burst 50 mbytes } limit lim_icmp_dsl { rate over 1400 kbytes/second burst 1400 kbytes } counter icmp-ratelimit-dsl-fw {} counter icmp-ratelimit-local-fw {} counter icmp-fw {} counter invalid-fw {} counter fw-lo {} counter fw-lan {} counter fw-dsl {} counter reject-ratelimit-fw {} counter reject-fw {} counter reject-tcp-fw {} counter reject-icmp-fw {} counter invalid-rx {} counter rx-lo {} counter invalid-local4-rx {} counter invalid-local6-rx {} counter icmp-ratelimit-dsl-rx {} counter icmp-ratelimit-local-rx {} counter icmp-rx {} counter ssh-rx {} counter mosh-rx {} counter dns-rx {} counter wg-rx {} counter yggdrasil-gre-rx {} counter ipv6-pd-rx {} counter ntp-rx {} counter dhcp-rx {} counter samba-rx {} counter http-rx {} counter tftp-rx {} counter established-rx {} counter reject-ratelimit-rx {} counter reject-rx {} counter reject-tcp-rx {} counter reject-icmp-rx {} counter tx-lo {} counter icmp-ratelimit-dsl-tx {} counter icmp-ratelimit-local-tx {} counter icmp-tx {} counter ssh-tx {} counter mosh-tx {} counter dns-tx {} counter wg-tx {} counter yggdrasil-gre-tx {} counter ipv6-pd-tx {} counter ntp-tx {} counter dhcp-tx {} counter samba-tx {} counter http-tx {} counter tftp-tx {} counter tx {} chain forward_icmp_accept { oifname dsl limit name lim_icmp_dsl counter name icmp-ratelimit-dsl-fw drop iifname dsl limit name lim_icmp_dsl counter name icmp-ratelimit-dsl-fw drop oifname != dsl limit name lim_icmp_local counter name icmp-ratelimit-local-fw drop iifname != dsl limit name lim_icmp_local counter name icmp-ratelimit-local-fw drop counter name icmp-fw accept } chain forward { type filter hook forward priority filter policy drop ct state invalid log level debug prefix "drop invalid forward: " counter name invalid-fw drop iifname lo counter name fw-lo accept oifname {lan, dsl} meta l4proto $icmp_protos jump forward_icmp_accept iifname lan oifname dsl counter name fw-lan accept iifname dsl oifname lan ct state {established, related} counter name fw-dsl accept limit name lim_reject log level debug prefix "drop forward: " counter name reject-ratelimit-fw drop log level debug prefix "reject forward: " counter name reject-fw meta l4proto tcp ct state new counter name reject-tcp-fw reject with tcp reset ct state new counter name reject-icmp-fw reject } chain input { type filter hook input priority filter policy drop ct state invalid log level debug prefix "drop invalid input: " counter name invalid-rx drop iifname lo counter name rx-lo accept iif != lo ip daddr 127.0.0.1/8 counter name invalid-local4-rx reject iif != lo ip6 daddr ::1/128 counter name invalid-local6-rx reject iifname dsl meta l4proto $icmp_protos limit name lim_icmp_dsl counter name icmp-ratelimit-dsl-rx drop iifname != dsl meta l4proto $icmp_protos limit name lim_icmp_local counter name icmp-ratelimit-local-rx drop meta l4proto $icmp_protos counter name icmp-rx accept tcp dport 22 counter name ssh-rx accept udp dport 60001-61000 counter name mosh-rx accept iifname lan tcp dport 53 counter name dns-rx accept iifname lan udp dport 53 counter name dns-rx accept meta protocol ip udp dport 51820 counter name wg-rx accept meta protocol ip6 udp dport 51821 counter name wg-rx accept iifname "yggdrasil-wg-*" meta l4proto gre counter name yggdrasil-gre-rx accept iifname dsl meta protocol ip6 udp dport 546 udp sport 547 counter name ipv6-pd-rx accept iifname mgmt udp dport 123 counter name ntp-rx accept iifname {lan, mgmt} udp dport 67 counter name dhcp-rx accept iifname lan udp dport { 137, 138, 3702 } counter name samba-rx accept iifname lan tcp dport { 445, 139, 5357 } counter name samba-rx accept iifname yggdrasil tcp dport 80 counter name http-rx accept iifname mgmt udp dport 69 counter name tftp-rx accept ct state {established, related} counter name established-rx accept limit name lim_reject log level debug prefix "drop input: " counter name reject-ratelimit-rx drop log level debug prefix "reject input: " counter name reject-rx meta l4proto tcp ct state new counter name reject-tcp-rx reject with tcp reset ct state new counter name reject-icmp-rx reject } chain output { type filter hook output priority filter policy accept oifname lo counter name tx-lo accept oifname dsl meta l4proto $icmp_protos limit name lim_icmp_dsl counter name icmp-ratelimit-dsl-tx drop oifname != dsl meta l4proto $icmp_protos limit name lim_icmp_local counter name icmp-ratelimit-local-tx drop meta l4proto $icmp_protos counter name icmp-tx accept tcp sport 22 counter name ssh-tx udp sport 60001-61000 counter name mosh-tx tcp sport 53 counter name dns-tx udp sport 53 counter name dns-tx meta protocol ip udp sport 51820 counter name wg-tx meta protocol ip6 udp sport 51821 counter name wg-tx iifname "yggdrasil-wg-*" meta l4proto gre counter name yggdrasil-gre-tx meta protocol ip6 udp sport 546 udp dport 547 counter name ipv6-pd-tx udp sport 123 counter name ntp-tx accept udp sport 67 counter name dhcp-tx accept udp sport { 137, 138, 3702 } counter name samba-tx accept tcp sport { 445, 139, 5357 } counter name samba-tx accept tcp sport 80 counter name http-tx accept udp sport 69 counter name tftp-tx accept iifname mgmt udp dport 69 counter name tftp-tx accept counter name tx } } table ip nat { counter dsl-nat {} chain postrouting { type nat hook postrouting priority srcnat policy accept oifname dsl counter name dsl-nat masquerade } } table ip mss_clamp { counter dsl-mss-clamp {} chain postrouting { type filter hook postrouting priority mangle policy accept oifname dsl tcp flags & (syn|rst) == syn counter name dsl-mss-clamp tcp option maxseg size set rt mtu } }