/* *   OSPFD routing daemon *   Copyright (C) 1998 by John T. Moy *    *   This program is free software; you can redistribute it and/or *   modify it under the terms of the GNU General Public License *   as published by the Free Software Foundation; either version 2 *   of the License, or (at your option) any later version. *    *   This program is distributed in the hope that it will be useful, *   but WITHOUT ANY WARRANTY; without even the implied warranty of *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *   GNU General Public License for more details. *    *   You should have received a copy of the GNU General Public License *   along with this program; if not, write to the Free Software *   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *//* * Link state database aging. * When an LSA is received/originated, it is placed in a bin * permanently. Bin granularity is one second. Then, as the database * aging time fires, the bins requiring attention (those at * MinLSInterval, CheckAge, LSRefreshTime and MaxAge) shift. * This avoids having to actually update ages in LSAs. * * LSA is aging if both it is a) in the database and b) it does not * have its DoNotAge bit set and c) ls_age is not equal to MaxAge. * Including DoNotAge LSAs in the age * bins allows us to use the same mechanims for when a) performing * CheckAge processing on DoNotAge LSAs and b) when flushing DoNotAge * LSAs after their originator has been unreachable for MaxAge. DoNotAge * LSAs are always inserted into the Age0Bin, regardless of their received * LS age value, */inline	uns16 Age2Bin(age_t x){    if (x <= LSA::Bin0)	return (LSA::Bin0 - x);    else	return (MaxAge+1 + LSA::Bin0 - x);}inline	age_t Bin2Age(uns16 x){    return((age_t) Age2Bin(x));}inline	int LSA::is_aging(){    if (!valid())	return(false);    else if ((lsa_rcvage & DoNotAge) != 0)	return(false);    else if (lsa_rcvage == MaxAge)	return(false);    else	return(true);}inline	age_t LSA::lsa_age(){    return (is_aging() ? Bin2Age(lsa_agebin) : lsa_rcvage); }inline	age_t LSA::since_received(){    if (is_aging())	return (lsa_age() - lsa_rcvage);    else	return (Bin2Age(lsa_agebin));}