cnipv4
curl -sSL http://www.ipdeny.com/ipblocks/data/countries/cn.zone -o /opt/clash/cnv4.zone
ipset create cnv4 hash:net
for i in $(cat /opt/clash/cnv4.zone); do ipset add cnip $i; done
ipset save cnv4 > /opt/clash/cnv4.ipset
ipset destroy cnv4
cnipv6 (optional)