From 509e328c03c41b6db326a352d46af91d2e45f28b Mon Sep 17 00:00:00 2001
From: CallMeR <9463297+callmer@user.noreply.gitee.com>
Date: Fri, 18 Apr 2025 09:57:03 +0800
Subject: [PATCH] =?UTF-8?q?=E6=9B=B4=E6=96=B0=20TS=20=E9=98=B2=E7=81=AB?=
 =?UTF-8?q?=E5=A2=99?=
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---
 src/debian/debian_ts_nftables.conf | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/debian/debian_ts_nftables.conf b/src/debian/debian_ts_nftables.conf
index 7534136..47179d3 100644
--- a/src/debian/debian_ts_nftables.conf
+++ b/src/debian/debian_ts_nftables.conf
@@ -25,31 +25,32 @@ table inet router {
 
     chain input {
         type filter hook input priority filter; policy drop;
-        ct state established,related accept comment "defconf: handle inbound flows"
         iif "lo" accept comment "defconf: accept traffic from loopback"
+        ct state vmap { established : accept, related : accept } comment "defconf: handle inbound flows"
+        tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "defconf: rate limit new TCP connections"
         iifname "eth0" jump input_lan comment "defconf: handle LAN IPv4 / IPv6 input traffic"
         iifname "tailscale0" jump input_tailscale comment "tsconf: handle TS IPv4 / IPv6 input traffic"
     }
 
     chain forward {
         type filter hook forward priority filter; policy drop;
-        ct state established,related goto handle_offload comment "defconf: handle forwarded flows"
-        ct state invalid counter drop comment "defconf: drop packets in invalid flow state"
+        ct state established,related flow add @ft;
+        ct state vmap { established : accept, related : accept } comment "defconf: handle forwarded flows"
         iifname "eth0" jump forward_lan comment "defconf: handle LAN IPv4 / IPv6 forward traffic"
         iifname "tailscale0" jump forward_tailscale comment "tsconf: handle TS IPv4 / IPv6 forward traffic"
     }
 
     chain output {
         type filter hook output priority filter; policy accept;
-        ct state established,related accept comment "defconf: handle outbound flows"
         oif "lo" accept comment "defconf: accept traffic towards loopback"
+        ct state vmap { established : accept, related : accept } comment "defconf: handle outbound flows"
         oifname "eth0" jump output_lan comment "defconf: handle LAN IPv4 / IPv6 output traffic"
         oifname "tailscale0" jump output_tailscale comment "tsconf: handle TS IPv4 / IPv6 output traffic"
     }
 
-    chain handle_offload {
-        flow add @ft accept comment "defconf: track forwarded flows"
-        accept
+    chain syn_flood {
+        limit rate 50/second burst 100 packets return comment "defconf: accept new TCP connections below rate-limit"
+        counter drop comment "defconf: drop excess new TCP connections"
     }
 
     chain input_lan {