Firewall on iptables

iptables -A INPUT -i eth0 -p tcp --dport 22 -j ACCEPT
iptables -A INPUT -i eth0 -p udp --dport 80 -j ACCEPT
iptables -A INPUT -i eth0 -p udp --dport 443 -j ACCEPT
iptables -A INPUT -i eth0 -j DROP