RTAX_LOCK
return dst_metric(dst, RTAX_LOCK) & (1 << metric);
return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
fi->fib_metrics->metrics[RTAX_LOCK - 1] & (1 << RTAX_MTU))
metrics[RTAX_LOCK - 1] |= BIT(RTAX_MTU);