1 files changed, 115 insertions, 0 deletions

diff --git a/files/files/etc/ruleset.nft b/files/files/etc/ruleset.nft
new file mode 100644
index 0000000..7767eb6
--- /dev/null
+++ b/files/files/etc/ruleset.nft
@@ -0,0 +1,115 @@
+define icmp_protos = { ipv6-icmp, icmp, igmp }
+
+table inet filter {
+  counter icmp-ratelimit-fw {}
+
+  counter icmp-fw {}
+
+  counter invalid-fw {}
+  counter fw-lo {}
+
+  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-rx {}
+  counter icmp-rx {}
+
+  counter ssh-rx {}
+  counter prometheus-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-tx {}
+  counter icmp-tx {}
+
+  counter ssh-tx {}
+  counter prometheus-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
+
+
+    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
+
+
+    meta l4proto $icmp_protos limit name lim_icmp counter name icmp-ratelimit-rx drop
+    meta l4proto $icmp_protos counter name icmp-rx accept
+
+
+    iifname mgmt tcp dport 22 counter name ssh-rx accept
+    iifname mgmt tcp dport 9100 counter name prometheus-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
+
+
+    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 22 counter name ssh-tx
+    tcp sport 9100 counter name prometheus-tx
+
+
+    counter name tx
+  }
+}
\ No newline at end of file