From e1483ff2214541c2ad3f2f99770ed41544bb8721 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Fri, 31 Dec 2021 16:42:52 +0100
Subject: vidhar: ...
---
hosts/vidhar/network/ruleset.nft | 159 +++++++++++++++++++++++++++++++++++++++
1 file changed, 159 insertions(+)
create mode 100644 hosts/vidhar/network/ruleset.nft
(limited to 'hosts/vidhar/network')
diff --git a/hosts/vidhar/network/ruleset.nft b/hosts/vidhar/network/ruleset.nft
new file mode 100644
index 00000000..57ac2716
--- /dev/null
+++ b/hosts/vidhar/network/ruleset.nft
@@ -0,0 +1,159 @@
+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
+ }
+
+ chain input {
+ type filter hook input priority filter
+ policy accept
+
+ iifname != dsl limit name lim_arp_local counter drop
+ iifname dsl limit name lim_arp_dsl counter drop
+
+ counter
+ }
+
+ chain output {
+ type filter hook output priority filter
+ policy accept
+
+ oifname != dsl limit name lim_arp_local counter drop
+ oifname dsl limit name lim_arp_dsl counter drop
+
+ counter
+ }
+}
+
+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_icmp_accept {
+ oifname dsl limit name lim_icmp_dsl counter drop
+ iifname dsl limit name lim_icmp_dsl counter drop
+ oifname != dsl limit name lim_icmp_local counter drop
+ iifname != dsl limit name lim_icmp_local counter drop
+ counter accept
+ }
+ 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 {lan, dsl} meta l4proto $icmp_protos jump forward_icmp_accept
+
+ iifname lan oifname dsl counter accept
+ iifname dsl oifname lan 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 $icmp_protos counter accept
+
+ tcp dport 22 counter accept
+ udp dport 60001-61000 counter accept
+
+ iifname lan tcp dport 53 counter accept
+ iifname lan udp dport 53 counter accept
+
+ meta protocol ip udp dport 51820 counter accept
+ meta protocol ip6 udp dport 51821 counter accept
+ iifname "yggdrasil-wg-*" meta l4proto gre counter accept
+
+ iifname dsl meta protocol ip6 udp dport 546 udp sport 547 counter accept
+
+ iifname mgmt udp dport 123 counter accept
+
+ iifname {lan, mgmt} udp dport 67 counter accept
+
+ iifname lan udp dport { 137, 138, 3702 } counter accept
+ iifname lan tcp dport { 445, 139, 5357 } counter accept
+
+ ct state {established, related} 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_dsl counter drop
+ oifname != dsl meta l4proto $icmp_protos limit name lim_icmp_local 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
+ }
+}
+
+table ip mss_clamp {
+ chain postrouting {
+ type filter hook postrouting priority mangle
+ policy accept
+
+
+ oifname dsl tcp flags & (syn|rst) == syn counter tcp option maxseg size set rt mtu
+ }
+}
\ No newline at end of file
--
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