In 1.167:
1492 case SIOCSIFFLAGS:
1493 switch (ifp->if_flags & (IFF_UP|IFF_RUNNING)) {
1494 /*
1495 * If interface is marked down and it is
running,
1496 * then stop and disable it.
1497 */
1498 (*ifp->if_stop)(ifp, 1);
1499 break;
No case label here.
Masao