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blockcheck: ip,nf tables use tcp flags for incoming redirection

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bol-van 2024-10-28 14:48:10 +03:00
parent 43cd263cff
commit 840292e7d9
1 changed files with 3 additions and 5 deletions
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8
blockcheck.sh
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@ -842,15 +842,15 @@ pktws_ipt_prepare_tcp()
pktws_ipt_prepare tcp $1 "$2"
# for autottl mode
case "$FWTYPE" in
iptables)
# for autottl
$IPTABLES -N blockcheck_input -t mangle 2>/dev/null
$IPTABLES -F blockcheck_input -t mangle 2>/dev/null
IPT INPUT -t mangle -j blockcheck_input
$IPTABLES -t mangle -A blockcheck_input ! -p tcp -j RETURN
$IPTABLES -t mangle -A blockcheck_input -p tcp ! --sport $1 -j RETURN
$IPTABLES -t mangle -A blockcheck_input -m connbytes --connbytes-dir=reply --connbytes-mode=packets ! --connbytes 1 -j RETURN
$IPTABLES -t mangle -A blockcheck_input -p tcp ! --tcp-flags SYN,ACK SYN,ACK -j RETURN
for ip in $2; do
$IPTABLES -A blockcheck_input -t mangle -s $ip -j NFQUEUE --queue-num $QNUM
done
@ -858,12 +858,10 @@ pktws_ipt_prepare_tcp()
nftables)
ipver=$IPV
[ "$IPV" = 6 ] || ipver=
# for autottl
make_comma_list iplist $2
nft "add rule inet $NFT_TABLE prenat meta nfproto ipv${IPV} tcp sport $1 ip${ipver} saddr {$iplist} ct original packets 1 queue num $QNUM"
nft "add rule inet $NFT_TABLE prenat meta nfproto ipv${IPV} tcp sport $1 tcp flags & (syn | ack) == (syn | ack) ip${ipver} saddr {$iplist} queue num $QNUM"
;;
ipfw)
# for autottl mode
for ip in $2; do
IPFW_ADD divert $IPFW_DIVERT_PORT tcp from $ip $1 to me proto ip${IPV} tcpflags syn,ack in not diverted not sockarg
done