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define icmp_protos = { ipv6-icmp, icmp, igmp }
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
}
chain forward {
type filter hook forward priority filter
policy drop
ct state invalid log prefix "drop invalid forward: " counter drop
iifname lo counter accept
oifname != dsl meta l4proto $icmp_protos limit name lim_icmp_local counter drop
oifname dsl meta l4proto $icmp_protos limit name lim_icmp_dsl counter drop
meta l4proto $imp_protos counter accept
iifname eno1 oifname dsl counter accept
iifname dsl oifname eno1 ct state {established, related} counter accept
limit name lim_reject log prefix "drop forward: " counter drop
log prefix "reject forward: " counter
meta l4proto tcp ct state new counter reject with tcp reset
ct state new counter reject
counter
}
chain input {
type filter hook input priority filter
policy drop
ct state invalid log prefix "drop invalid input: " counter drop
iifname lo counter accept
iif != lo ip daddr 127.0.0.1/8 counter reject
iif != lo ip6 daddr ::1/128 counter reject
iifname dsl meta l4proto $icmp_protos limit name lim_icmp_dsl counter drop
iifname != dsl meta l4proto $icmp_protos limit name lim_icmp_local counter drop
meta l4proto $imp_protos counter accept
ct state {established, related} counter accept
tcp dport 22 counter accept
meta protocol ip udp dport 51820 counter accept
udp dport 60000-61000 counter accept
iifname dsl meta protocol ip6 udp dport 546 udp sport 547 counter accept
limit name lim_reject log prefix "drop input: " counter drop
log prefix "reject input: " counter
meta l4proto tcp ct state new counter reject with tcp reset
ct state new counter reject
counter
}
chain output {
type filter hook output priority filter
policy accept
oifname lo counter accept
oifname != dsl meta l4proto $icmp_protos limit name lim_icmp_local counter drop
oifname dsl meta l4proto $icmp_protos limit name lim_icmp_dsl counter drop
meta l4proto $icmp_protos counter accept
counter
}
}
table ip nat {
chain postrouting {
type nat hook postrouting priority srcnat
policy accept
oifname dsl counter masquerade
counter
}
}
table inet mangle {
chain postrouting {
type filter hook postrouting priority mangle
policy accept
oifname dsl meta l4proto tcp tcp flags & (syn|rst) == syn counter tcp option maxseg size set rt mtu
counter
}
}
|
