fixtime
u_long qarrtime = fixtime(ntohl(n->tr_qarr));
qarrtime = fixtime(ntohl((n-1)->tr_qarr));
u_long fixtime(u_long time);
hop = t_diff(fixtime(ntohl(r->tr_qarr)), buf->qtime);
int timediff = (fixtime(ntohl(s->tr_qarr)) -
fixtime(ntohl(r->tr_qarr))) >> 16;