pt_entry_vpn6
addr->v6 = ((struct pt_entry_vpn6 *)pte)->prefix6;
addr->rd = ((struct pt_entry_vpn6 *)pte)->rd;
addr->labellen = ((struct pt_entry_vpn6 *)pte)->labellen;
((struct pt_entry_vpn6 *)pte)->labelstack,
static struct pt_entry_vpn6 pte_vpn6;
const struct pt_entry_vpn6 *va6, *vb6;
va6 = (const struct pt_entry_vpn6 *)a;
vb6 = (const struct pt_entry_vpn6 *)b;
struct pt_entry_vpn6 *pvpn6 = (struct pt_entry_vpn6 *)pte;