iptables 如何只开放80 和 22端口

# Generated by iptables-save v1.4.7 on Tue Aug 18 11:44:46 2015
*filter
:INPUT ACCEPT [17053:17940802]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [16568:30862755]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Tue Aug 18 11:44:46 2015