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define icmp_protos = {ipv6-icmp, icmp, igmp}
table arp filter {
limit lim_arp {
rate over 50 mbytes/second burst 50 mbytes
}
counter arp-rx {}
counter arp-tx {}
counter arp-ratelimit-rx {}
counter arp-ratelimit-tx {}
chain input {
type filter hook input priority filter
policy accept
limit name lim_arp counter name arp-ratelimit-rx drop
counter name arp-rx
}
chain output {
type filter hook output priority filter
policy accept
limit name lim_arp counter name arp-ratelimit-tx drop
counter name arp-tx
}
}
table inet filter {
limit lim_reject {
rate over 1000/second burst 1000 packets
}
limit lim_icmp {
rate over 50 mbytes/second burst 50 mbytes
}
counter invalid-fw {}
counter fw-lo {}
counter fw-printer {}
counter fw-host {}
counter icmp-fw {}
counter icmp-ratelimit-fw {}
counter reject-ratelimit-fw {}
counter reject-fw {}
counter reject-tcp-fw {}
counter reject-icmp-fw {}
counter drop-fw {}
counter invalid-rx {}
counter rx-lo {}
counter invalid-local4-rx {}
counter invalid-local6-rx {}
counter icmp-ratelimit-rx {}
counter icmp-rx {}
counter dhcp-rx {}
counter cups-rx {}
counter established-rx {}
counter reject-ratelimit-rx {}
counter reject-rx {}
counter reject-tcp-rx {}
counter reject-icmp-rx {}
counter drop-rx {}
counter tx-lo {}
counter icmp-ratelimit-tx {}
counter icmp-tx {}
counter cups-tx {}
counter dhcp-tx {}
counter tx {}
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
meta l4proto $icmp_protos limit name lim_icmp counter name icmp-ratelimit-fw drop
meta l4proto $icmp_protos counter name icmp-fw accept
iifname printer oifname eth0 ip daddr 10.141.5.0 meta l4proto . th dport { tcp . 53, udp . 53, udp . 123 } counter name fw-printer accept
iifname printer oifname eth0 ip6 daddr 2a03:4000:52:ada:5:: meta l4proto . th dport { tcp . 53, udp . 53, udp . 123 } counter name fw-printer accept
iifname eth0 oifname printer counter name fw-host 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
counter name drop-fw
}
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
meta l4proto $icmp_protos limit name lim_icmp counter name icmp-ratelimit-rx drop
meta l4proto $icmp_protos counter name icmp-rx accept
tcp dport 631 counter name cups-rx accept
iifname printer udp dport 67 counter name dhcp-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
counter name drop-rx
}
chain output {
type filter hook output priority filter
policy accept
oifname lo counter name tx-lo accept
meta l4proto $icmp_protos limit name lim_icmp counter name icmp-ratelimit-tx drop
meta l4proto $icmp_protos counter name icmp-tx accept
tcp sport 631 counter name cups-tx accept
udp sport 67 counter name dhcp-tx accept
counter name tx
}
}
table ip nat {
counter host-nat {}
chain postrouting {
type nat hook postrouting priority srcnat
policy accept
oifname eth0 counter name host-nat masquerade
}
}
table ip mss_clamp {
counter host-mss-clamp {}
chain postrouting {
type filter hook postrouting priority mangle
policy accept
oifname eth0 tcp flags & (syn|rst) == syn counter name host-mss-clamp tcp option maxseg size set rt mtu
}
}
|
