From 1c934617f661dc0bc471c0f0b4ace254c55182df Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Thu, 3 Jun 2021 01:46:06 +0200 Subject: extensions: libxt_tcp: rework translation to use flags match representation Use the new flags match representation available since nftables 0.9.9 to simplify the translation. Signed-off-by: Pablo Neira Ayuso --- extensions/libxt_tcp.txlate | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'extensions/libxt_tcp.txlate') diff --git a/extensions/libxt_tcp.txlate b/extensions/libxt_tcp.txlate index bba63324..921d4af0 100644 --- a/extensions/libxt_tcp.txlate +++ b/extensions/libxt_tcp.txlate @@ -11,13 +11,13 @@ iptables-translate -I OUTPUT -p tcp --dport 1020:1023 --sport 53 -j ACCEPT nft insert rule ip filter OUTPUT tcp sport 53 tcp dport 1020-1023 counter accept iptables -A INPUT -p tcp --tcp-flags ACK,FIN FIN -j DROP -nft add rule ip filter INPUT tcp flags & fin|ack == fin counter drop +nft add rule ip filter INPUT tcp flags fin / fin,ack counter drop iptables-translate -A INPUT -p tcp --syn -j ACCEPT -nft add rule ip filter INPUT tcp flags & (fin|syn|rst|ack) == syn counter accept +nft add rule ip filter INPUT tcp flags syn / fin,syn,rst,ack counter accept iptables-translate -A INPUT -p tcp --syn --dport 80 -j ACCEPT -nft add rule ip filter INPUT tcp dport 80 tcp flags & (fin|syn|rst|ack) == syn counter accept +nft add rule ip filter INPUT tcp dport 80 tcp flags syn / fin,syn,rst,ack counter accept iptables-translate -A INPUT -f -p tcp nft add rule ip filter INPUT ip frag-off & 0x1fff != 0 ip protocol tcp counter -- cgit v1.2.3