36 lines
1.1 KiB
Bash
Executable file
36 lines
1.1 KiB
Bash
Executable file
#!/bin/sh
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. /etc/functions.sh
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export WAN=$(nvram get wan_ifname)
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export IPT=/usr/sbin/iptables
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for T in filter nat mangle ; do
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$IPT -t $T -F
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$IPT -t $T -X
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done
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# initial rules
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$IPT -t filter -A INPUT -m state --state INVALID -j DROP
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$IPT -t filter -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
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$IPT -t filter -A FORWARD -m state --state INVALID -j DROP
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$IPT -t filter -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
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if [ -d /etc/firewall.d ]; then
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for fw in /etc/firewall.d/??*; do
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[ -x $fw ] && $fw
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done
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fi
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# defaults
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$IPT -t filter -A INPUT -p icmp -j ACCEPT
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$IPT -t filter -A INPUT -p 47 -j ACCEPT # allow GRE
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$IPT -t filter -A INPUT -i $WAN -p tcp --syn --tcp-option \! 2 -j DROP
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$IPT -t filter -A INPUT -i $WAN -p tcp -j REJECT --reject-with tcp-reset
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$IPT -t filter -A INPUT -i $WAN -j REJECT --reject-with icmp-port-unreachable
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$IPT -t filter -A FORWARD -i br0 -o br0 -j ACCEPT
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$IPT -t filter -A FORWARD -i $WAN -m state --state NEW -j DROP
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$IPT -t filter -A FORWARD -o $WAN -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
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$IPT -t nat -A POSTROUTING -o $WAN -j MASQUERADE
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