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ruleset: make synflood lighter using ct state #31

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ruleset: make synflood lighter using ct state #31

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38a6069
ruleset: make synflood lighter using ct meta
brada4 May 29, 2024
aeb6cac
Relocate rule to drop unneeded packets asap
brada4 Jun 1, 2024
c3f104f
Revert "Relocate rule to drop unneeded packets asap"
brada4 Jun 5, 2024
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2 changes: 1 addition & 1 deletion root/usr/share/firewall4/templates/ruleset.uc
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Original file line number Diff line number Diff line change
Expand Up @@ -117,7 +117,7 @@ table inet fw4 {
{% fw4.includes('chain-prepend', 'input') %}
ct state vmap { established : accept, related : accept{% if (fw4.default_option("drop_invalid")): %}, invalid : drop{% endif %} } comment "!fw4: Handle inbound flows"
{% if (fw4.default_option("synflood_protect") && fw4.default_option("synflood_rate")): %}
tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
ct state new meta l4proto tcp jump syn_flood comment "!fw4: Rate limit TCP syn packets"
{% endif %}
{% for (let rule in fw4.rules("input")): %}
{%+ include("rule.uc", { fw4, zone: null, rule }) %}
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2 changes: 1 addition & 1 deletion tests/01_configuration/01_ruleset
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Expand Up @@ -113,7 +113,7 @@ table inet fw4 {
iif "lo" accept comment "!fw4: Accept traffic from loopback"

ct state vmap { established : accept, related : accept } comment "!fw4: Handle inbound flows"
tcp flags & (fin | syn | rst | ack) == syn jump syn_flood comment "!fw4: Rate limit TCP syn packets"
ct state new meta l4proto tcp jump syn_flood comment "!fw4: Rate limit TCP syn packets"
iifname "br-lan" jump input_lan comment "!fw4: Handle lan IPv4/IPv6 input traffic"
iifname "pppoe-wan" jump input_wan comment "!fw4: Handle wan IPv4/IPv6 input traffic"
jump handle_reject
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