ia_flags
if (ia->ia_flags & IFA_ROUTE) {
target->ia_flags |= IFA_ROUTE;
if ((target->ia_flags & IFA_ROUTE) == 0)
if ((ia->ia_flags & IFA_ROUTE) == 0) {
target->ia_flags &= ~IFA_ROUTE;
ia->ia_flags |= IFA_ROUTE;
target->ia_flags &= ~IFA_ROUTE;
if (ia->ia_flags & IFA_ROUTE) {
ia->ia_flags |= IFA_ROUTE;
if ((target->ia_flags & IFA_ROUTE) == 0)
if ((ia->ia_flags & IFA_ROUTE) == 0) {
target->ia_flags &= ~IFA_ROUTE;
target->ia_flags &= ~IFA_ROUTE;