check_netmask
if (check_netmask($9.nat->host, r.af))
if (check_netmask($9.rdr->host, r.af))
if (check_netmask($9->host, r.af))
if (check_netmask($8, binat.af))
if (check_netmask($9, binat.af))
if (check_netmask($13->host, binat.af))
error += check_netmask(src_host, r->af);
error += check_netmask(dst_host, r->af);
int check_netmask(struct node_host *, sa_family_t);