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iptables: Only jump into BADTCP for TCP packets.

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This saves us from evaluating lots of rules for non-TCP
packets.
This commit is contained in:
Michael Tremer
2013-07-08 15:17:56 +02:00
parent b85d2a9819
commit c0359d6dfb
1 changed files with 3 additions and 3 deletions
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6
src/initscripts/init.d/firewall
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@@ -70,13 +70,13 @@ iptables_init() {
# NEW TCP without SYN
/sbin/iptables -A BADTCP -p tcp ! --syn -m conntrack --ctstate NEW -j NEWNOTSYN
/sbin/iptables -A INPUT -p tcp -j BADTCP
/sbin/iptables -A FORWARD -p tcp -j BADTCP
# Connection tracking chain
/sbin/iptables -N CONNTRACK
/sbin/iptables -A CONNTRACK -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
/sbin/iptables -A INPUT -j BADTCP
/sbin/iptables -A FORWARD -j BADTCP
# Fix for braindead ISP's
/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu